TWI572810B - Lighting device - Google Patents

Description

Lighting device

The present invention relates to an illumination device using a light guide.

In recent years, LEDs (Light Emmitting Diodes) have been widely used as light sources for illumination devices. In the case of light sources for indoor lighting devices of the ceiling type, LEDs have also been used to replace fluorescent tubes. The LED lighting device is characterized by mercury free, which is a light source that takes into consideration the environment. Further, in the case of an LED lighting device, it is preferable to use an LED lighting device using a light guide (light guide plate) for various designs, and various light guides have been developed. In the case of these, there are also those shown in Patent Documents 1 to 4.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 5-210014

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2013-201069

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2010-244902

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2014-78459

Consider one kind of light guide shape in one of various designs It is the outermost and exposed design of the lighting device. According to the design shown above, since the user of the illumination device views the light guide directly, the unevenness of light is easily recognized by the user as compared with the case where the light guide is covered with the diffusing optical member. When the light emitted from the LED is incident on the light guide body and the light is appropriately emitted from the light guide body, that is, the light guide body is linearly uneven due to the LED. In the design in which the light guide body is formed to be exposed to the outermost portion of the illumination device, Patent Documents 1 to 4 do not have such a problem, and thus there is a possibility that unevenness cannot be suppressed. An object of the present invention is to provide an illumination device using a light guide that suppresses the unevenness that occurs in a light guide body corresponding to a light source.

In order to solve the above problems, an illumination device according to the present invention includes: a plurality of light sources having an exit surface for emitting light; and an illumination device for guiding a light guide through which light emitted from an exit surface of the plurality of light sources enters, wherein: The light guiding system has a light extraction unit for emitting light to the outside of the light guide. If the illumination device mainly sets the direction of the emitted light to the front direction, part or all of the front direction of the illumination device The outermost portion is the light guide body, and the light extraction portion is formed using ink that transmits light and has scattering properties.

By the present invention, it is possible to form a suppression corresponding to the light source A light guide that is unevenly formed by a light guide, and is a well-designed light guide and an illumination device using the same.

1‧‧‧Lighting device

2‧‧‧Light guide

2A‧‧‧Incoming surface

2B‧‧‧Transmission direction transformation

2BI, 2BO, 2CI, 2CO‧‧‧ face

2C‧‧‧Outlet Department

2G‧‧‧Installation Department

2GC‧‧‧ Cover Installation Department

2GF‧‧‧Flange

2GR‧‧‧R shape

2P‧‧‧Light guide

2PA‧‧‧ incident surface

2PO‧‧‧Outlet

2P1, 2P2, 3P1, 3P2‧‧‧ Location

3‧‧‧Light extraction department

3A‧‧‧1st light extraction department

3AS‧‧‧ surface

3B‧‧‧2nd light extraction department

3MR‧‧‧ line

4, 4D, 4L‧‧‧LED light source

4A‧‧‧Outlet

5‧‧‧Substrate

6‧‧‧Reflecting sheet (reflecting member)

7‧‧‧Frame

7A, 7B‧‧‧ Frame on the front side (reflective member)

7BE‧‧‧ end

8‧‧‧Outer cover (reflecting member)

9‧‧‧ Inner cover (reflecting member)

10‧‧‧Power circuit

10A‧‧‧Wiring

11‧‧‧Reflex cap

12‧‧‧Light guide fixing

19‧‧‧scatter cover member

50‧‧‧ ceiling

51‧‧‧ Fixtures

51A‧‧‧Protruding

51B‧‧‧Wiring

52‧‧‧ Ceiling light line seat

60‧‧‧Light source cover

61‧‧‧ Spreader

62‧‧‧Power supply frame

63‧‧‧Wiring and spreader

64‧‧‧Metal mouth

65‧‧‧Light bulb frame

M1, M2‧‧‧ observers

RAY31~RAY33, RAY41A, RAY41B, RAY42A, RAY42B, RAY41AE, RAY42AE, RAY42BE, RAY51, RAY61, RAY71, RAY 71', RAY141, RAY142‧‧ ‧ rays

Fig. 1 (a) is a front view for explaining a configuration of an illumination device according to a first embodiment of the present invention.

Fig. 1(b) is a front elevational view showing a state in which the light guide 2 and the outer cover 8 are removed from Fig. 1(a).

Figure 2 is a cross-sectional view taken along line A-A' of Figure 1.

Fig. 3 is an enlarged view of the left half of Fig. 2.

Fig. 4 (a) is a view for explaining the factor of the efficiency reduction when the light extraction portion is a groove.

Fig. 4(b) is an enlarged view for explaining the reflection of light in the groove in Fig. 4(a).

Fig. 4 (c) is a view for explaining light extraction in the light extraction portion formed using ink.

Fig. 4 (d) is an enlarged view for explaining light scattering at the light extraction portion in Fig. 4 (c).

Fig. 5(a) is a diagram for explaining line unevenness.

Fig. 5(b) is a diagram for explaining line unevenness.

Fig. 5(c) is a diagram for explaining line unevenness.

Fig. 5(d) is a diagram for explaining line unevenness.

Fig. 5(e) is a diagram for explaining line unevenness.

Fig. 6(a) is a diagram for explaining color unevenness.

Fig. 6(b) is a diagram for explaining color unevenness.

Fig. 6(c) is a diagram for explaining color unevenness.

Fig. 6(d) is a diagram for explaining color unevenness.

Fig. 7 (a) is an enlarged cross-sectional view showing a state in which the first light extraction portion 3A is mirror-finished.

Fig. 7 (b) is an enlarged cross-sectional view showing the light take-out portion 3 formed by using ink.

Fig. 7(c) is a graph showing the alignment characteristics of the person having the scattering characteristic and the non-scattering characteristic in the light extraction unit 3.

Fig. 8 is an enlarged cross-sectional view showing the light extracting portion 3 using the groove.

Fig. 9 is a cross-sectional view showing a first modification of the first embodiment.

Fig. 10 (a) is a front elevational view showing the configuration of an illumination device according to a second embodiment of the present invention.

Fig. 10 (b) is a cross-sectional view taken along line C-C' of Fig. 10 (a).

Fig. 11 (a) is a front elevational view showing the configuration of an illumination device according to a second embodiment of the present invention.

Fig. 11 (b) is a cross-sectional view taken along line D-D' of Fig. 11 (a).

Fig. 12 (a) is a perspective view for explaining a configuration of an illumination device according to a third embodiment of the present invention.

Figure 12 (b) is a cross-sectional view of Figure 12 (a).

Fig. 13 (a) is a view showing an example in which the incident surface 2A is not flat.

Figure 13 (b) is a cross-sectional view of Figure 13 (a).

Fig. 14 (a) is a cross-sectional view showing a state in which the ceiling lamp holder 52 and the fixture 51 are attached to the ceiling (first embodiment).

Fig. 14 (b) is a cross-sectional view showing a state in which the frame 7 of the member other than the light guide 2, the outer cover 8, and the reflection cap 11 is attached and fixed, and the reflection cap 11 is attached. Implementation form).

Fig. 14 (c-1) is a cross-sectional view showing a state in which the light guide 2 is mounted in Fig. 14 (b) (first embodiment).

Fig. 14 (c-2) is a front view showing a state in which the light guide 2 is attached to Fig. 14 (b) (first embodiment).

Fig. 14 (d) is a cross-sectional view showing a state in which the outer cover 8 is attached to Fig. 14 (c-1) (first embodiment).

Fig. 14 (e) is a cross-sectional view showing the periphery of the mounting portion 2G in an enlarged manner.

Fig. 14 (f) is an enlarged cross-sectional view showing the periphery of the smaller flange 2GF.

"First Embodiment"

Fig. 1 (a) is a front view for explaining a configuration of an illumination device according to a first embodiment of the present invention. Fig. 1(b) is a front elevational view showing the configuration of an illumination device according to a first embodiment of the present invention. For the sake of explanation, the light guide 2 and the outer cover 8 are removed, focusing on the LED light source 4 (4L, 4D). )Configuration Figure. Fig. 2 is a cross-sectional view taken along line A-A' of Fig. 1(a). The direction is defined by the arrow as shown in Fig. 2. The front direction FD system illumination device 1 mainly illuminates the direction of light. The direction in which the illuminating device 1 mainly illuminates the light means a illuminating device of a type that is disposed on the ceiling 50 or suspended from the ceiling 50 to illuminate the room (surrounding), that is, a direction from the ceiling 50 toward the floor (direction by the illuminating device 1) The direction of the floor, the direction directly below the lighting device 1).

The back surface direction BD is opposite to the front direction FD and has a direction in which the ceiling 50 is located. The outer direction OD is substantially perpendicular to the front direction FD and is directed outward by the center of the illumination device 1. The direction from the outer side of the illumination device 1 toward the center of the illumination device 1 is set to be substantially perpendicular to the front direction FD.

1 is a front view of a substrate 5 (ie, a front direction FD) of a substrate 5 having an LED light source 4, that is, a light source having an LED. The light source having an LED means that it may have a single or multiple LEDs, or may be a light source that seals a single or multiple LEDs with a resin containing a phosphor or the like. For example, it is a blue light-emitting blue light-emitting device that emits light having a peak in the vicinity of 450 nm, and a light source sealed by a resin or the like containing one or more kinds of phosphors. At this time, light emitted from the blue LED and light converted by the wavelength of the phosphor are emitted from the light source. Therefore, the color or light beam emitted (light-emitting) by the light source can be adjusted by changing the amount and type of the phosphor, the number of types of phosphors placed in the resin to be sealed, and the like. The sealing system may be carried out by using a resin, and the case of using glass or the like may also be used. Further, the LED and the phosphor may be formed in a separate configuration.

In addition, the LED can also be directly mounted on the substrate 5, and It is sealed with a resin or the like. The resin may or may not contain a phosphor. Further, the LED may be mounted on a lead frame or the like for sealing, and the packaged light source may be mounted on the substrate 5. At this time, the phosphor may be mixed in the resin to be sealed. A so-called surface mount type LED can also be mounted on the substrate 5. When an LED is provided, since it functions as a light source, various combinations as a light source can be performed.

The invention is not limited to the method of constructing a light source or a light source, A variety of light sources can be used. Hereinafter, a description will be given of a light source having an LED as a representative light source. Among them, for the sake of simplicity, a light source having an LED is referred to as an LED light source 4. In the substrate 5, the surface on which the LED light source 4 is mounted is referred to as a mounting surface. Fig. 1 (a) is a view for explaining the outlines of the light guide 2, the substrate 5, the outer cover 8, the inner cover 9, and the first light extraction portion 3A and the second light extraction portion 3B which are provided by the light guide 2. In the front view, only the main relevant parts are described in the description. Fig. 1(b) is a view focusing on the arrangement of the LED light sources 4 (4L, 4D) as described above, and therefore only the substrate 5, the LED light sources 4 (4L, 4D), and the inner cover 9 are described. 2 is a cross-sectional view of a plane parallel to the normal line of the substrate 5 on which the LED light source 4 is mounted. Only the main components are also described in FIG.

The illuminating device 1 is substantially circular when viewed from the front. shape. The illuminating device 1 is composed of a light guide 2, an LED light source 4, a substrate 5, a reflective sheet 6, a frame 7, an outer cover 8, an inner cover 9, a power supply circuit 10, a reflective cap 11, and a fixture 51. . In order to solve the problem, the illumination device 1 may have at least the light guide 2, the LED light source 4, the substrate 5, and the power supply circuit 10. Further, in the case of the lighting device 1, Provided is an illumination device 1 in which the light distribution characteristics of the illumination device 1 are approximately formed as Lambert light distribution or more suitable light distribution characteristics as a light distribution characteristic thereof, and thus The reflective sheet 6 or the like as the reflecting member may be used.

The substrate 5 has a substantially circular wheel shape when viewed from the front. The LED light source 4 is disposed on the outermost circumference of the illuminating device 1 and is disposed on the substrate 5 along the outer circumference of the illuminating device 1 in one row. In this configuration, as many of the LED light sources 4 as possible, the light guide body 2 can be arranged corresponding to the incident surface 2A formed by the continuous plane. Therefore, in order to achieve a large amount of light, a thin shape, and an equidistance structure for illuminating the periphery of the lighting device 1 such as a floor or a wall of a room or a ceiling 50. Since most of the LED light sources 4 can be arranged, they also vary depending on the performance of the LED light source 4. However, the illumination device 1 of the present configuration is formed such that the maximum shape of the illumination device 1 is 450 mm. ~700mm A light beam of 60001 m or more can be emitted by the illumination device 1.

The LED light source 4 includes an exit surface 4A that emits light, and a substrate mounting surface that is configured to be mounted on the substrate 5. In the present embodiment, as shown in FIG. 1(b), the LED light source 4 is disposed on the substrate 5 such that two LED light sources (4L, 4D) are interlaced. The two-color LED light source 4 is a warm LED light source 4L having a color temperature of about 2,500 k to 3,500 k and a white LED light source 4D of about 6000 k to 7000 k. A color grading function that changes the color of the light emitted by the illuminating device 1 by the power supply circuit 10 in the range of the color temperature of the LED light source 4L to the color temperature of the LED light source 4D is realized. Wherein, the invention is not limited The LED light source is set to two colors, which can be more colors or monochrome. Further, the color temperatures of the respective colors in the present invention are not limited. A representative example will be used for explanation.

If the substrate 5 is a continuous substrate, all LED light sources The 4 series can be easily arranged at equal intervals. In this example, all of the LED light sources 4 are arranged at equal intervals. The light emitted from the LED light source 4 is incident on the light guide 2 by the incident surface 2A of the light guide 2 disposed corresponding to the exit surface 4A from which the light is emitted from the LED light source 4.

Among them, the number of colors, configuration, etc. of the LED light source 4 is not a bureau Limited to the above.

As shown in Fig. 2, the cross section of the light guide body 2 of the present embodiment The shape has a shape in which the curved portion, that is, the propagation direction changing portion 2B, and the continuous propagation direction changing portion 2B, which is a portion that is substantially the same direction as the inner direction, that is, the surface emitting portion 2C. The surface emitting portion 2C is composed of two surfaces (2CI and 2CO) which are substantially parallel and substantially flat.

The faces 2CI and 2CO constituting the face exit portion 2C are compared with the structure The surfaces 2BI and 2BO of the propagation direction changing unit 2B are smaller in angle with the surface perpendicular to the front direction FD, and are parallel to the surface perpendicular to the front direction FD. Although it may be completely flat, in this example, the shape is not uneven due to injection molding, and the cross-sectional shape of the faces 2CI and 2CO is a substantially circular arc shape, and the length of the arc (from the outer end to the illumination device) The distance of the center of 1 is about 300 mm. On the other hand, it is a surface having a cross-sectional shape having a curvature radius of more than about 5000 mm which is approximately close to a plane. In this embodiment, the cross-sectional shape is an arc, but It is not limited thereto, and may be a curve different from an arc, or may be a fold line, or may be a straight line or a fold line mixed with a curve, and may of course be a straight line.

Further, the propagation direction converting unit 2B of the present embodiment is constructed. The cross-sectional shape of the faces 2BI and 2BO is a substantially circular arc shape having a central radius of about 10 mm to 40 mm and a central angle of about 90 degrees. However, in the present embodiment, the arc is formed, but the function of changing the direction of propagation of the light may be used. Therefore, the curved portion may be used. It is sufficient to change the direction of light propagation by at least 45 degrees or more (if the cross-sectional shape is a substantially circular arc, the central angle is approximately 45 degrees or more). The curved portion may be a curve different from the circular arc, or may be formed by a straight line or a broken line and an arc, or may be a curve formed by a straight line or a broken line and an arc, or may be a broken line.

Further, the light guide 2 of the present embodiment is configured such that the width (thickness) of the incident surface 2A is thicker than the vicinity of the center of the light guide 2. In other words, the propagation direction changing unit 2B is formed to have a thicker portion than the vicinity of the center of the surface emitting unit 2C. In this way, the light from the LED light source 4 is incident on the light guide 2 as much as possible from the incident surface 2A, and the light is not leaked at a position other than the second light extraction portion 3B in the propagation direction changing portion 2B. The width (thickness) of the incident surface 2A is set to a predetermined thickness or more until it is transmitted to the surface emitting portion 2C (preferably, the width of the emission surface 4A of the LED light source 4 is not less than 5 mm in the present embodiment). When the emission portion 2C is thickened, the emission portion 2C becomes heavy. Therefore, in view of the weight reduction of the light guide body 2, the vicinity of the center of the surface emission portion 2C is gradually thinned. Therefore, the arc of the cross-sectional shape of the surface 2CI and 2CO is formed as the origin and An arc with a different radius of curvature.

In addition, the light guide body 2 is formed of a transparent material. The material is acrylic, polycarbonate, polystyrene, or a resin such as these composite materials. However, in the present invention, the light guide 2 is not limited to these materials if it is transparent to the extent that it can be guided. For example, if a shape can be produced, glass or the like can also be used.

The cross-sectional shape of the light guide 2 in the present embodiment is The incident surface 2A has a substantially main light emitting direction of the LED light source 4 (the angular distribution of the illuminance of the LED light source 4 is the strongest direction), and is substantially in the same direction as the normal direction of the exit surface 4A of the LED light source 4 (also That is, the front direction FD) rises. By forming the cross-sectional shape in the vicinity of the incident surface 2A in this shape, it is effective to make the light emitted from the LED light source 4 efficiently incident, and to guide the incident light to the front direction so as not to leak the light guide 2 .

At this time, from the incident surface 2A, the rising angle of the faces 2BI, 2BO The degree 2Ag (shown in FIG. 3) is 0.5 degrees or more, preferably 5 degrees or more and less than 10 degrees. This range of angles is based on the following reasons. After the light guide 2 is injection molded, when it is taken out by the light guide manufacturing mold, the angle 2Ag must be at least 0.5 degrees or more, preferably 5 degrees or more, and the angle 2Ag is larger than that in order to be taken out. 10 degrees, an angular range set by the phenomenon that light does not propagate in the propagation direction converting portion 2B and leaks. In particular, about 5 degrees is the propagation direction changing unit 2B, and light is hardly leaked, and from the viewpoint of molding, it is also a sufficiently large angle and is an optimum angle. However, if it is taken out by the mold for manufacturing the light guide by injection molding, most of the light is transmitted. The case where the broadcast direction converting unit 2B does not propagate and leaks disappears, that is, is not limited to the above-described rising angle. Further, the molding is not limited to the above-described rising angle when the molding is performed by a method other than injection molding.

The enlarged view of the left half of Fig. 2 is shown in Fig. 3. The center line CL passes through the center of the illumination device 1 and is parallel to the front direction FD. In Fig. 3, RAY31~RAY33 are shown as ray tracing examples.

The light incident on the incident surface 2A is in accordance with the cross section of the light guide 2 The shape and the propagation direction are changed in the propagation direction converting unit 2B, and propagated in the surface emitting unit 2C. In the light guide of the light guide 2, when the light reaches the surface of the light guide 2 inside the light guide 2, the angle between the normal of the surface and the light is equal to or greater than the total reflection angle. That is, it is totally reflected, and by repeating the total reflection, light is guided in the light guide body 2. The condition that light is incident on the surface constituting the light guide 2 at an angle equal to or higher than the total reflection angle and guided light is referred to as a light guiding condition. Light that is destroyed by the light guiding conditions is emitted by the light guiding body 2.

The action of the light extraction portion 3 is incident on the light extraction portion 3 Part or all of the light that is totally reflected and totally reflected is emitted to the light extraction unit 3 by being transmitted through the light guide 2, or the reflected light at the portion is transmitted through the other portion without being totally reflected. Reflection is performed in a manner other than the light guide 2.

The surface emitting portion 2C has a first light extracting portion 3A. in In the present embodiment, the first light extraction unit 3A is disposed on the surface 2CO which is the surface on the front side of the surface emission unit 2C. The light RAY31 in Figure 3 The propagation direction changing unit 2B propagates, and the first light extraction unit 3A of the surface emission unit 2C scatters and transmits the emission surface 2CO to the front side. Here, the front direction side refers to a direction in which the front direction FD is the origin and the angle of the front direction FD is within ±90 degrees.

The ray ray 32 in Fig. 3 is in the propagation direction changing section 2B propagates, and the first light extraction portion 3A of the surface emitting portion 2C performs scattering reflection to reach the reflection sheet 6 as a reflection member, and the reflection sheet 6 is scattered and reflected, and the transmission surface 2CI passes through the emission surface 2CO. An example of a shot in the front direction.

The light extraction unit 3A of the present embodiment has scattering properties and emits light. A member that transmits/reflects. Specifically, in order to use a film formed of ink (paint), light is transmitted while scattering and reflected.

Here, the ink means that the resin contains a coloring matter. A substance such as a pigment such as a substance or a scattering material (scattering material). In the present invention, a paint having such a condition is also included as ink. The film having the scattering property formed on the surface of the light guide 2 by drying (curing) the ink becomes the light extraction unit 3. The light extraction portion 3 formed using ink refers to the film. In the present invention, if it is not misunderstood, not only the ink in a liquid state but also the case where the coating film is also called ink. In the light extraction unit 3 of the present invention, the film system may have a function of damaging the light guiding conditions by scattering and extracting light from the light guide 2.

RAY31 is used to illuminate light in the light extraction portion 3A by scattering The condition is broken, and the light is taken out by the light extraction unit 3A (scattered through).

RAY32 is used to illuminate the light guide strip by scattering in the light extraction portion 3A The member is reflected (scattered and reflected) while being collapsed, and is emitted from the light guide 2, and is reflected by the illumination device 1 when the reflective sheet 6 is reflected again.

In the case of ink, consider incorporating oxygen in a transparent resin. Scattering materials such as titanium. The ink in which the titanium oxide is mixed with the transparent resin is formed into a white ink by scattering of titanium oxide. However, in order to satisfy the characteristics as an ink, the resin may contain various organic substances. Among the organic substances, there is a case where a part of the wavelength of visible light is absorbed, so that there is a case where the color is attached. Most of the organic substances absorb short wavelengths of blue or purple, so they are mostly white with yellow color. In addition, if there is a material that absorbs a large amount, it may also become gray. The type or characteristics of the ink are not particularly limited to those of the present inventors. However, it is preferred that the ink is white and has no absorption.

The scattering material is preferably fine particles. The particle size of the microparticles is less than 10 μm is preferably about 1 μm to 0.05 μm and is about the same as or slightly smaller than the wavelength of visible light. When the scattering property of the fine particles is the same as the wavelength of visible light, the scattering performance is high. The particle diameter may be less than 0.05 μm, but as the wavelength of the visible light is smaller, the scattering property is more lowered, so that it is preferably more than 0.01 μm.

The scattering material can be of one type or can be composed of a plurality of types to make. The material is preferably a material having high scattering properties when blended with a resin, and preferably any of titanium oxide, silica, alumina, calcium carbonate, and barium sulfate.

In addition, these materials have high thermal emissivity and thermal conductivity. Resin, so if the materials are infiltrated into the ink, the light extraction portion 3 is formed. When the heat emissivity of the light extraction unit 3 is higher than the heat emissivity of the surface of the light guide 2 formed of a resin, the thermal efficiency of the light guide 2 heated by the LED light source 4 is achieved. The effect of radiation.

As shown in this embodiment, the light guide 2 is formed as a light. The design that exposes the outermost portion of the device 1 is directly radiated to the outside of the illumination device 1. Therefore, the thermal conductivity or the ratio of thermal emissivity of the scattering material disposed in the light extraction portion of the outermost light guide 2 It is extremely important that the light guide 2 formed of a resin such as acrylic acid, polycarbonate, or polystyrene has a heat transfer rate or a higher heat emissivity.

The reflective sheet 6 in this embodiment is white scattering reflection The member is disposed on the back side of the surface emitting portion 2C of the light guide 2, and reflects incident light from the light guide 2 to the front direction side.

In this embodiment, the substrate 5 is mounted in a white surface. Reflective film covering. The substrate 5 is located in the vicinity of the LED light source 4, so that the reflected light on the incident surface 2A (reflection according to the reflectance expressed by the Fresnel equation) or the reflected light from other reflective members is incident on the substrate 5, Therefore, it is preferable to reduce the absorption by increasing the reflectance by the arrangement of the coating, the reflection film, and the reflective sheet 6 to reduce the absorption. In the present embodiment, the frame 7A is painted in white and is white-scattered and reflected.

In the propagation direction changing unit 2B, the outer direction side also has There is a second light extraction unit 3B that emits light. Here, the outer direction side refers to a direction in which the outer direction OD is the origin and the angle in the outer direction OD is within ±90 degrees. In addition, the second light extraction unit 3B may have a back surface that is 90 degrees or more from the front direction FD even when the front direction FD is the origin. To the side, that is, the ceiling, also the part where the light is emitted. The light ray RAY 33 in FIG. 3 is an example in which the second light extraction unit 3B scatters and transmits the light guide 2 in the back surface direction BD. The second light extraction unit 3B may be formed by attaching a groove to the light guide 2, but in the present embodiment, the light extraction unit 3B formed using ink is used.

From the viewpoint of increasing the amount of light on the side of the outer side, The light extracting portion 3 formed using the ink has an effect of making it easier to increase the amount of light than the light extracting portion 3 to which the groove is added to the light guide 2. This is based on the fact that the outgoing light system is mainly formed in a direction in which light is guided toward light and a direction in which an angle of 90 degrees or more is converted. When the angle of incidence of the light is changed by the shape of the groove, it is necessary to have a shape in which injection molding is difficult. Therefore, it is preferable to provide fine unevenness on the surface of the groove and perform angle conversion by scattering. Therefore, if the angle is changed by scattering, the light scattering property of the light extraction unit 3 formed by using the ink is higher than the scattering property of the fine unevenness on the surface of the groove by the experiment of the above, etc. The light extraction portion 3 formed by the ink is more likely to increase the amount of light. Among them, the light system after the light-scattering portion 3 formed by using the ink is formed into an emission scattering distribution close to the Lambertian light distribution.

The propagation direction changing unit 2B is along the outermost circumference of the illumination device 1 Since it is disposed at the outermost portion of the illuminating device 1, the light emitted from the surface 2BO is not shielded by other components of the illuminating device 1, and can be emitted toward the back surface BD and directly illuminate the ceiling 50.

The details of the light extraction unit 3 will be described later. In this In the embodiment, some or all of the front direction FD in the illumination device 1 The outermost part of the outer direction OD is formed as the light guide 2, and the light extraction unit 3 is provided to the outer surfaces 2BO and 2CO in the propagation angle conversion unit 2B and the surface emission unit 2C, respectively. The light that is scattered and reflected by the light extraction unit 3 is broken by the light guiding condition, and is emitted by the light guide 2, and is directly emitted toward the periphery of the floor, the room wall, the ceiling 50, and the like, and is irradiated to the surroundings. Effect.

Here, in the propagation angle conversion unit 2B and the surface emission unit 2C The light extraction portion 3 may be the inner surface 2BI, 2CI, or the outer surfaces 2BO, 2CO, or both sides on the inner side and the outer side, or one of the inner sides and the outer side. However, if the surrounding light is directly illuminated by the light from the light guide 2 (a part or all of the front direction FD or a part of the outer direction OD of the illuminating device 1 is the light guide 2), both of them are located inside. There is an advantage that dust or dirt does not adhere to the light take-out portion 3.

In the past, in general lighting devices, especially in individuals In a home lighting device, a diffusing cover member for scattering light emitted from the light guide plate is disposed in front of a flat plate-shaped light guide plate, and light emitted from the light guide plate is scattered and transmitted to illuminate the floor. Or around the lighting of the room wall. When the light emitted from the light guide plate directly illuminates the surroundings, the light toward the wall or the ceiling direction is reduced. Therefore, there is a problem that the indirect light around the illumination is reduced by reflecting on the wall or the ceiling. To solve these problems, a scattering cover member for scattering the light emitted from the light guide plate is disposed on the front surface of the light guide plate.

According to the configuration of the embodiment, the LED light source 4 follows the photo The outermost circumference of the apparatus 1 is arranged, and the incident surface 2A and the propagation angle conversion unit 2B are disposed on the outermost circumference corresponding to the LED light source 4. Further, since the surface 2CO having the normal line toward the outer direction OD (the normal line is inclined by the front direction FD) has the second light extraction portion 3B, the light scattered in the second light extraction portion 3B is emitted from the surface 2BO. Since some or all of the front direction FD and a part of the outer direction OD of the illuminating device 1 are formed as the light guide body 2, the emitted light is not shielded by other components, and the outer direction OD and the back direction can be irradiated. BD. That is, the illumination device 1 is configured as a part or all of the outermost light guide 2 in the front direction FD, and the light extraction unit 3 can be directly viewed by the user, and directly illuminates the surroundings with the light from the light guide 2. Composition. Therefore, the light from the first light extraction unit 3A is combined with the configuration of the present embodiment to achieve the effect of illuminating the entire periphery of the lighting device 1 such as the floor or the room wall or the ceiling 50.

It is important to explain the constitution of this embodiment in other ways. The feature that the light from the LED light source 4 passes through the surface emitting portion 2C and the propagation angle converting portion 2B, propagates from the outermost periphery toward the center, and is taken out at a predetermined position by the light extracting portion 3 to be emitted; and the light guiding body 2 is not only a flat plate shape, but also a three-dimensional shape. According to this feature, the illumination device 1 obtains effects such as a large amount of light, a thin shape, an equal emission, and the like of the entire periphery of the illumination device 1.

In addition, in this embodiment, it is not used to guide light. The light emitted from the body 2 is a scattering cover member or the like, and the light emitted from the light guide 2 directly illuminates the periphery of the illumination device 1. With the light guide 2 The light directly illuminates the periphery of the illumination device 1 with at least the advantages described below.

The first advantage is as follows. If in front of the light guide 2 A diffusing cover member is disposed, and the diffusing cover member transmits a portion of the light and reflects it. Therefore, the reflected light is returned to the inside of the illumination device, and a part of the light is absorbed by the member that absorbs the light in the illumination device, causing a loss. As described in the present embodiment, when the light from the light guide 2 directly illuminates the periphery of the illumination device 1, the loss is reduced and the light use efficiency of the illumination device 1 is improved.

With my simulation, if I will be relatively all LED light source 4 When the ratio of the light lost by the illuminating device 1 is the loss rate, the emitted light has a total light transmission with respect to the optical system of the illuminating device 1 having only the light guide 2 having a loss rate of 7.5%. In the illuminating device of the scattering cover member having a rate of 65%, the loss rate was 12%. Therefore, it can be seen that the loss of 4.5% can be reduced by not providing the scattering cover member. The reduced value is changed in accordance with the total light transmittance of the optical system of the bright device 1 and the scattering cover member. However, since the scattering cover member is not provided, it is estimated that the loss rate is improved by about 4.5% to 10%.

The second advantage is as follows. As mentioned before, if in the light guide 2 A scattering cover member is disposed on the front surface, and the scattering cover member transmits a part of the light and reflects it. A part of the reflected light is reflected again by the member in the illumination device. However, in general, the reflectance of the member is not constant in the wavelength of all the light, and therefore at a certain wavelength of the re-reflected light of the member Light will have light compared to other wavelengths, and the reflected beam will be smaller. Hey. That is, if the member reflects light again, there is a change in color. In this case, for example, when the color temperature of the light emitted from the LED light source 4 is 6500 k, the light emitted from the illumination device in which the scattering cover member is disposed may be 6200 K. However, as shown in the present embodiment, when the light from the light guide 2 directly illuminates the periphery of the illumination device 1, since there is no light reflected by the scattering cover member on the front surface of the light guide 2, the guide is achieved. The front surface of the light body 2 has an effect of less variation in color than in the case of a scattering cover member. The reduction in the loss rate means that the number of reflections of the members in the illumination device 1 is reduced, that is, since the number of reflections is small, the change in color is also reduced.

The third advantage is as follows. a part in the lighting device 1 In the configuration in which the outermost portion FD or the outermost portion OD of the outermost portion is the light guide 2, the light emitted by the LED light source 4 is guided by the substantially transparent light guide 2, and the light is guided by the outermost portion. The illuminating device 1 that the light body 2 emits in response to the light extraction unit 3 disposed in response to the light guide 2 and the blinking light emission (light emission) of the light extraction unit 3 achieve an aesthetically pleasing effect.

Further, at this time, the light extraction unit 3 is not only broken but also broken. Bad light guiding conditions are also important for light transmission. This is based on the fact that when the light is not transmitted, the light extraction portion may have a line or a point that appears gray or black during illumination, thereby detracting from the quality of the illumination.

The transmittance of the light extraction portion 3 is mainly caused by the dispersion of the ink. The concentration of the shot is controlled. The transmittance must be caused by the color unevenness suppression, the line unevenness suppression, and the effect of obtaining an appropriate light distribution characteristic. Sexuality is determined by the trade off relationship of the lighting situation. When the concentration of the scattering material is lowered to increase the transmittance, the scattering property is lowered. On the other hand, when the density of the scattering material is increased and the transmittance is lowered, the scattering performance is increased, but the light extraction portion 3 appears as a line or a dot of gray or black, and the flickering feeling of the light extraction portion 3 disappears.

The transmittance of the light extraction portion 3 is known by my experiments. It is preferably higher than 40%, more preferably 55 to 85%, without deteriorating the quality of the state being illuminated, and color unevenness can be suppressed. However, the lower limit of the transmittance is not limited to 40%. For example, when the light extraction unit 3 is disposed on the surface side (2CI) facing the emission surface of the light guide 2, in order to increase the reflected light in the front direction FD, the transmittance is lower than 40%, and the reflectance is improved. situation. At this time, the light extraction unit 3 is also shaded with respect to the scattered light from the reflective sheet 6. In order to reflect the scattered light to the reflective sheet 6 without increasing the loss, the light extraction unit 3 is formed into a light-transmitting structure. It is extremely important. Among them, the transmittance was measured by a spectrophotometer with an integrating sphere.

In addition, by using light that the light will pass through, it is not lit. In the illuminating device 1 at the time, the light extraction unit 3 is formed as a translucent line, and if the light extraction unit 3 is configured to be directly viewable by the user, the illumination device 1 having a transparent feeling can be provided as an illumination device, and the design is improved. Effect.

The fourth advantage is as follows. Due to the front of the light guide 2 Since the scattering cover member is not provided, industrial waste of the scattering cover member can be reduced at the time of disposal. Further, since the manufacturing process of the scattering cover member is not provided, the effect of producing the lighting device with energy saving can be achieved.

Wherein, the function of the aforementioned scattering cover member is The light emitted from the light guide plate is scattered and transmitted to illuminate the function of the periphery of the illumination device such as the floor or the room wall. In the illumination device 1, the three-dimensional shape of the light guide body 2 and the light extraction unit 3 are used. This is achieved by the combination of the position, the scattering characteristics of the light extraction unit 3, and the reflection members such as the reflective sheet 6.

In the lighting device 1 of the present embodiment, the lighting device 1 is mounted. The scattering cover member achieves an effect that light is more scattered, and line unevenness or color unevenness described later is further reduced.

Here, the role of the reflecting member is mentioned. In the past The angular distribution (light distribution characteristic) of the emitted light from the illumination device by the transmission scattering of the scattering cover is approximately formed as a Lambertian light distribution. However, as shown in the present embodiment, when a part or all of the front direction FD and a part of the outer direction OD of the illuminating device 1 are the light guide 2, the light from the light guide 2 directly illuminates the floor, or In the configuration of the room wall and the ceiling 50, since the light distribution characteristics of the sum of the lights emitted from the exit surfaces 2BO and 2CO are approximately the light distribution characteristics of the illumination device 1, the sum of the light emitted from the surface of the light guide 2 must be approximately In the Lambertian light distribution, the light guide 2 is transparent to the extent that light can be guided. Therefore, it is difficult to obtain the scattering effect of the scattering cover by the light guide 2 alone.

Therefore, in the present embodiment, a detailed description will be given below. The scattering characteristics of the light extraction unit 3 and the light distribution characteristics of the illumination device 1 are roughly formed into a Lambertian light distribution or a light distribution characteristic wider than the light distribution unit 3, thereby forming an appropriate light distribution. Characteristic lighting device 1.

Use the ray RAY32 in Figure 3 again to illustrate the reflection The effect of the component. In the present embodiment, the light extraction unit 3 of the light guide 2 is used for scattering transmission and scattering reflection. The ratio of transmitted light to reflected light depends on the scattering characteristics of the light extraction portion 3. Therefore, the light extraction unit 3 can transmit light propagating in the light guide 2 such that the light guide 2 faces the reflection member (RAY 32) and the light guide 2 as in the case of the light rays RAY 31 and RAY 32. It is emitted in substantially the same direction (RAY31) as the front direction FD. In addition, as shown in the RAY 31, the first light extraction unit 3A of the present embodiment also emits in the front direction FD, but the direction of the front direction FD is inclined in the propagation direction (the inner direction in FIG. 3). The situation where the luminosity becomes larger. The front direction side is referred to as approximately the same direction as the front direction FD.

Light ray32 is attached to the reflecting member (reflecting sheet 6) The light is scattered and propagates in the front direction FD direction. However, the present invention is not limited thereto. Although there is a certain directivity, the scattered light also propagates in the outer direction and the inner side. The scattering effect of the reflecting sheet 6 as the reflecting member, that is, the effect of reflecting scattering over a wide angle range is equal to or higher than the scattering effect of the above-described scattering cover. Therefore, the surface emitting portion 2C emits light that is transmitted through the light guiding body 2 by the scattered light of the reflecting member and light that is emitted by the first light extracting portion 3A and is destroyed by the light guiding condition, and thus is formed into a Lambert distribution. Light. Further, as shown in FIG. 3, in the configuration in which a gap is provided between the light guide 2 and the reflection member, light is spread during the propagation of the gap. Therefore, even if this configuration is used, a further exit position can be obtained. Distribution (illuminance distribution) uniformity effect.

In addition, in order to make the outer direction brighter, if the reflection structure is The member is disposed on the inner side of the light guide 2, and covers not only the position in the vicinity of the center of the frame 7, that is, the position at which the reflection member (reflection sheet 6) faces the surface emission portion 2C, but also in the vicinity of the propagation angle conversion portion 2B. The reflection member (reflection sheet 6) is also disposed in the vicinity of the LED light source 4 at a position facing the propagation angle conversion portion 2B, and the reflection sheet 6 covering the plane near the center of the frame 7 and the reflection sheet 6 disposed near the LED light source 4 are disposed. It is preferable that the reflection sheet 6 is also white-coated with the frame 7A as a reflection member. The reflection member that reflects the light from the second light extraction unit 3B is located at a position away from the distance, and the reflected light returned to the propagation angle conversion unit 2B due to the diffusion during the propagation in the air is reduced, and the propagation angle is changed. The amount of light emitted by the portion 2B is reduced.

Generally, the light extraction portion 3 is formed to be reversed In the configuration of the radiation/transmission, the reflection member is disposed on the side of the back surface side of the surface emission portion 2C, and the light distribution characteristics are improved to have good characteristics.

According to the configuration of the embodiment, the light guide 2 is made of white. The light reflected by the reflecting member is emitted from the entire light guide 2, and the light extraction unit 3 emits brighter light. Therefore, the transparency of the light guide 2 and the degree of whiteness that can be seen through the light guide 2 and the blinking light emission (light emission) of the light extraction unit 3 achieve an effect of illuminating the appearance.

The substrate 5 is described as a continuous substrate, all The LED light source 4 is arranged at equal intervals. If the LED light sources 4 are not arranged at equal intervals, there will be a field where the distance of the LED light source 4 is far away. Compared with the location where the distance is close, the unevenness of the light becomes darker. Further, as shown in the present embodiment, when two-color LED light sources 4 (4L, 4D) are used, in addition to uneven light, color unevenness may occur and the appearance may be significantly impaired. Therefore, it is preferable that the LED light sources 4 are arranged at approximately equal intervals. Further, it is preferable that the gap between the adjacent LED light sources 4 is set to be less than 10 mm. When the gap between the adjacent LED light sources 4 is 10 mm or more, it is experimentally confirmed that unevenness in the gap between the adjacent LED light sources 4 and the darkness is caused. Further, when the gap between the adjacent two-color LED light sources 4 (4L, 4D) is 10 mm or more, the color does not mix, and the appearance is significantly impaired. These unevenness is a problem in that the light from the light guide 2 directly illuminates the periphery of the illumination device 1, and the light guide 2, which is an appearance of the illumination device 1, can be directly seen by a person.

Wherein, the substrate 5 can be formed as a continuous substrate, but From the viewpoint of the reduction of the industrial waste, it is preferable to combine the substrates which are equally divided into four equal parts, six equal parts, and eight equal parts to form a substantially circular wheel shape. The reasons are described below. Usually, a substrate is formed into a copper foil pattern or the like on a rectangular plate material, and a desired portion is cut out to be produced. When a continuous circular disk substrate is cut out from the original substrate, the substrate to be cut into a small area is divided into a small number of parts to be discarded. In other words, when a circularly-shaped shape is formed by combining the divided substrates, the number of substrates having a substantially circular wheel shape taken from the original one of the substrates is increased.

Combine equally divided substrates to make a roughly circular wheel The problem in the shape of a shape is that in the end portion where the substrate is divided, at different bases The distance between adjacent LED light sources 4 between the boards is greater than the distance between adjacent LED light sources 4 in the same substrate. However, in this case, it is preferable to arrange the LED light sources 4 at equal intervals as much as possible. Further, it is preferable that the gap between the adjacent LED light sources 4 be formed to be less than 10 mm. Wherein, in the same substrate, the distance between the adjacent LED light sources 4 is formed to be about 1.5 to 3 mm, so that the distance between adjacent LED light sources 4 can be formed to be the same between different substrates, and the confirmation is not completed. Unevenness that darkens corresponding to the aforementioned gap occurs.

In this embodiment, in order to be inadmissible by the LED light source 4 The light that has been incident on the light guide 2 is scattered and reflected, and an outer cover 8 and an inner cover 9 as reflection members are disposed around the LED light source 4. The two covers are formed as a material that transmits light, and from the viewpoint of design, the LED light source 4, the substrate 5, and the light guide 2 are not fixed to the frame 7 by the user. For the portion (not shown), it is preferable that the two covers are formed to be non-transmissive. However, the cover is preferably transmitted through the efficiency of the illumination device 1. Further, one of the covers may be formed as a material that is transmitted, and the other square may be made into a material that is impermeable. For example, the outer cover 8 can also hide the portion where the light guide 2 is fixed to the frame 7, and thus is formed to be opaque, and the inner cover 9 can be formed as a cover for scattering transmission from the viewpoint of efficiency. These covers are required members because they are configured by the user to see the light guide 2.

The frame 7 is basically composed of two metal frames 7A and 7B. The power supply circuit 10 is disposed on the frame 7B near the side of the ceiling, and the light guide body 2, the substrate 5, the reflective sheet 6, the outer cover 8, and the inner cover are disposed in the frame 7A. Optical parts such as cover 9. The frame 7A, which is a member on the light guide 2 side of the frame 7, is preferably a white coating for reflecting light from the LED light source 4 and the light guide 2. Further, it is more preferable to cover the frame 7A with the reflective sheet 6 having a higher reflectance than the coating. When the flat reflecting sheet 6 is used, the shape of the illuminating device 1 when viewed from the front is circular, and it is difficult to adhere to the inclined surface of the frame 7A, but it is preferably formed by a reflecting member such as a light reflecting plate. A three-dimensional reflecting member is formed to cover the entire frame 7A. It is preferable that the frame 7A or the covering material is used for various processing or addition of the member so as to be used as a reflecting member, and the reflecting member is preferably a white scattering member.

Used in the center of the illuminating device 1 to illuminate the illuminating device 1 A mechanism that is connected to the ceiling 50. An apparatus for providing the lighting device 1 is provided in the ceiling 50. Generally, the ceiling 50 is provided with a ceiling lamp holder 52 that supplies electric power while fixing the lighting device 1.

The fixing of the lighting device 1 is initially installed on the fixture 51 At the ceiling light line 52. The fixture 51 is provided with a protruding portion 51A that is introduced into the fixture 51 when pressed toward the center of the fixture 51. The cross section of the protruding portion 51A is substantially triangular. When the illuminating device 1 approaches the ceiling from the front direction FD, the end portion 7BE of the frame 7B is pressed and the protruding portion 51A is introduced into the fixture 51. If the end portion 7BE of the frame 7B is closer to the ceiling than the protruding portion 51A, the protruding portion 51A originally introduced into the fixture 51 is returned to the original position, and is formed in the state shown in Fig. 2, and the lighting device 1 is fixed to the ceiling. 50. Wherein, the invention is not It is defined as the shape (structure) of the fixture. The fixture may have a function for fixing the lighting device 1 to a predetermined position such as a ceiling.

Power is supplied to the fixture 51 by the ceiling light wire holder 52, This electric power is supplied from the fixture 51 to the power supply circuit 10 through the wiring 51B and the wiring 10A. The wirings 51B and 10A are connected by a connector. In order to prevent light from entering the space in which the fixture 51 and the wiring and the connector are housed, the reflection cap 11 is disposed to face the fixture 51. The reflecting cap 11 is a member that reflects light, and is generally a white member that performs scattering reflection. In order to improve safety, the reflective cap 11 is preferably a flame retardant resin. It is more preferable if the reflective sheet 6 is adhered to the surface of the reflective cap 11.

Next, the features when the light extraction unit 3 (3A, 3B) is viewed from the front will be described with reference to Fig. 1 . The LED light source 4 is disposed on the outermost circumference of the illuminating device 1 in one row (see FIG. 1(b)), and is disposed on the substrate 5 along the outer circumference of the illuminating device 1, and the illuminating device 1 is surrounded by one LED light source 4 Ring-shaped composition. The light guide body 2 is also circular in a front view, and the center coincides with the center of the illumination device 1. In addition, the first light extraction unit 3A and the second light extraction unit 3B are arranged in a ring shape in the same manner, centering on the center of the light guide 2 . In the present embodiment, the light extraction unit 3 (3A, 3B) is arranged in a ring shape. By arranging the LED light source 4, the light guide 2, the first light extraction unit 3A, and the second light extraction unit 3B along the outer circumference of the illumination device 1 as in the present embodiment, the uniform illumination device 1 can be realized. The effect around. Further, when the front view of the LED light source 4 and the arrangement of the light extraction portion are circular, the effect of the periphery of the illumination device 1 can be achieved. In addition, if the light extraction unit 3 (3A, 3B) is illuminated The center of the device 1 (light guide 2) is centered and formed in a ring shape, and the illumination method is an isotropic and beautiful effect.

As shown in this embodiment, if the light extraction unit 3 is a curve When the LED light source 4 is also arranged in a curved shape, the effect of the efficiency improvement is achieved when the LED light source 4 is also arranged in a curved shape.

Figure 4 (a) and Figure 4 (b) are used to illustrate the efficiency reduction The front view of the illumination device 1 is viewed from the front direction FD side. The LED light source 4 is not only light toward the center of the light guide 2, but also illuminates in a direction different from the center as shown by the RAYs 41A and 41B in the drawing. The RAYs 41A and 41B are reflected at the light extraction unit 3A at the points 3P1 and 3P2 of the light guide 2, respectively. The light extraction unit 3A in the drawing is a light extraction unit in which a groove 2 is attached to the surface 2CI on the inner side of the light guide 2, and is formed as a light extraction unit 3A having no scattering property.

As shown in this embodiment, if viewed from the front direction FD In the device 1, if the light extraction unit 3 is substantially circular (curved), the line 3MR connecting the point of the light extraction unit 3 after the light is incident to the substantially circular center and the angle θ az of the light are small. At this time, there is a high possibility that the light is taken out by the reflection of the light extraction unit 3A. When the angle θ az is large, the reflected light system in the light extraction unit 3A is often guided toward the other LED light source 4 different from the light source.

The light taken out by the shape of a groove or the like is taken as an angle θ az When it is small, light is taken out by the light guide 2 by reflection/transmission of the shape surface. The light system is represented by RAY41A and RAY41AE. Dotted line The arrows shown indicate light rays that conduct light in the light guide 2, and the solid lines indicate light rays that are taken out by the light guide 2.

On the other hand, the larger the angle θ az , the Fresnel reflection The higher the rate, the more the case where the light source RAY 41B is reflected and returned to the LED light source 4 as shown in Figs. 4(a) and 4(b). The light ray 41B is reflected at the spot 3P2, and is guided to the other LED light source 4 having the light source. When the light reaches the incident surface 2A, the incident surface 2A is emitted toward the LED light source 4 or the substrate 5 and is formed as a hybrid. astigmatism. This stray light is also emitted again by the illuminating device 1, but most of the loss is caused by the LED light source 4, the substrate 5, the outer cover 8, the inner cover 9, and the like. This loss is responsible for the reduction in efficiency.

Explain the use of light from the use of scattering ink The situation of the exit 3A. 4(c) and 4(d) are diagrams in which the light extraction unit 3A is disposed on the outer surface 2CO of the light guide 2. The light extraction portion 3A formed using ink is used to extract light by scattering transmission/reflection, and the light extraction performance does not largely depend on the incident angle (angle θ az). Therefore, as shown in FIG. 4(c), the light ray 42642 having a large angle θ az is also transmitted by the light guide 2 by scattering. Therefore, the situation in which the light is formed into stray light and the loss is caused is suppressed. 4(c) and 4(d), the light rays RAY42A and RAY42B indicated by dotted lines indicate light rays guided in the light guide body 2, and the light rays RAY42AE and RAY42BE indicated by solid lines indicate light guides. The light that the body 2 is taken out.

Light extraction performance of the light extraction portion 3A formed using ink The property that hardly depends on the angle of incidence (angle θ az) is even if the light is Which side and the position of the light guide 2 attached to the take-out portion 3A are the same. However, in the present embodiment, as described above, the transmittance of the light extraction portion 3A is preferably more than 40%. In this case, the efficiency is further improved by arranging the light extraction unit 3A on the outer surface 2CO instead of the inner surface of the light guide 2 so that more light is emitted from the light extraction portion.

Among them, the dispersion of the light extraction portion 3A formed by using ink The effect of the efficiency of the transmission/reflection characteristic not depending on the incident angle (angle θ az ) is such that when the illumination device 1 is viewed from the front direction FD, the light guide 2, the light extraction unit 3 or the LED light source 4 is substantially In the case of a circle, it is large, but it is not limited thereto, and in the case of a square, an ellipse, a polygon, an arbitrary curve, or a broken line, an effect is also achieved. For example, it is the shape of the light guide 2 shown in Fig. 11 (a) (Detailed second embodiment). When the light guiding direction of the light from the LED light source 4 is incident on the tangential line of the vertical light extracting portion 3, an effect is obtained. In the figure, the circle in which the light extraction unit 3 is drawn by a line is formed, but is not particularly limited, and may be formed in a shape such as a circle drawn by a dotted line, a broken line, or the like. In addition, when the LED light source 4 surrounds the light guide 2 in a part of the light source 4, light is incident on the light extraction unit 3A in a plurality of directions. Therefore, the efficiency is improved by the light extraction unit 3A formed by using the ink. When the LED light source 4 is arranged in a circular shape, it is a case in which all of the light guides 2 are surrounded.

It is extremely important that the light extraction portion 3 has scattering properties as above However, the problem as described below can be solved by the scattering property of the light extraction unit 3. This subject is, for example, a light-extracting portion 3, not a scattering ink, and a non-scattering groove is provided to the light guide 2, and When the groove is used as the light take-out portion 3, it occurs. In order to briefly explain the present problem, the light extraction unit 3 will be described with reference to FIG. 5 in which the flat light guide 2P having only one groove is used. A perspective view of the present light guide 2P and the LED light source 4D is shown in Fig. 5(a). 5(b) to 5(d) show that light is incident on the light guide 2P from the incident surface 2PA, and is reflected by the light extraction unit 3, and is emitted from the exit surface 2PO (surface perpendicular to the incident surface) of the light guide 2P. And arrive at the observer M1. The solid line with the arrow indicates the light from the LED light source 4D. The observer M1 is the person who views the places 2P1 and 2P2. The locations 2P1 and 2P2 are two locations corresponding to the light extraction unit 3. The point 2P1 is located in a plane including a straight line connecting the LED light source 4D and the observer M1 and perpendicular to the exit surface 2PO, and the point 2P2 is located outside the plane. Fig. 5(c) is a view showing a state in which the light ray 51 in Fig. 5(b) when the side view of Fig. 5(b) is guided to the observer M1 by the side view of Fig. 5(b).

In FIGS. 5(b) and 5(c), the light extraction unit 3 is positively The surface is a straight line when viewed from the surface, and the cross section is a substantially semicircular groove. Further, it is an example in which the faces constituting the grooves are formed by mirrors. At the point 2P1, the light system from the LED light source 4D advances directly toward the observer M1. Therefore, the observer M1 is aware that the location 2P1 is bright. On the other hand, in the point 2P2, the light from the LED light source 4D advances in a direction different from the direction toward the observer M1. Therefore, the light does not reach the observer M1, and the spot 2P2 is perceived to be dark. Therefore, as shown in FIGS. 5(b) and 5(c), when there is only one groove as the light extraction unit 3, a point (point 2P1) of the light extraction unit 3 appears to be bright.

As shown in FIG. 5(e), the display is provided with a plurality of light extraction sections. 3 examples. 5(e) shows the light guide 2P of the flat plate, and the light extraction unit 3 of FIG. 5(b) is attached with three at a predetermined interval in the longitudinal direction of the light guide plate 2P, and not only one, but also Fig. 5 (c) is a view similar to the state of light guided by the side view. At this time, the location corresponding to the light extraction unit 3, such as the location 2P1, includes a line connecting the LED light source 4D and the observer M1, and the location in the plane perpendicular to the exit surface 2PO appears brighter, except Locations other than this may appear to be darker. When at least the interval 2PDI of the light extraction unit 3 is less than 20 mm, the three places that are bright by the observer M1 corresponding to the light extraction unit 3 appear to be connected, and are perceived as bright lines. This is a linear unevenness.

If the light from the light guide 2 is directly illuminated around, due to Since the line is unevenly seen, there is a problem that the appearance of the lighting device 1 is significantly impaired.

A method for solving the problem is to provide scattering in the light extraction unit 3. Sex. That is, the problem can be solved by using the light extracting portion 3 formed using the scattering ink described in the present invention. The case where the scattering property is given to the light extraction unit 3 will be described with reference to Fig. 5(d). The symbol or the like used in the drawing means the same as FIG. 5(b).

The light from the LED light source 4D is printed with ink in a line shape The light extraction unit 3 of the water scatters, and a part of the scattered light is emitted from the spot 2P1 toward the observer M1. Further, the light emitted from the LED light source 4D to the spot 2P2 is also scattered by the light extraction unit 3, and a part of the scattered light is emitted from the spot 2P2 toward the observer M1. So not only by location 2P1, light It is also emitted from the location 2P2 and faces the observer M1. Therefore, not only the location 2P1 is bright, but also the location 2P2 becomes bright, and the difference in brightness between the two locations is moderated. If there is sufficient scattering, the same brightness is formed at the two locations. In other words, by providing the scattering characteristics in the light extraction unit 3, as shown by the actual light guide plate, if the plurality of light extraction units 3 are disposed, the line unevenness that appears to be a line is also suppressed. With respect to these phenomena, scattering characteristics were imparted to the light extraction unit 3, and an illumination device in which the LED light source 4 was placed on the substrate 5 at a pitch of about 5 mm was produced, and it was confirmed that line unevenness was suppressed.

Next, with reference to FIG. 6, the description about the color All. In the same manner as in FIG. 5, FIG. 6 shows a case where the light guide 2P of the flat plate has only one groove as the light extraction unit 3 for easy understanding. The difference from FIG. 5 is that the LED light sources 4L and 4D in which two color differences are arranged adjacently are used as the light source. 6(b) to 6(d) show that light from the LED light sources 4L, 4D of the two chromatic aberrations is incident on the light guide body 2P from the incident surface 2PA, and is reflected by the light extraction portion 3 and emitted by the light guide body 2P. The surface 2PO (the surface perpendicular to the incident surface) is emitted to reach the observer M1. The dotted line indicates the light from the LED light source 4L, and the solid line indicates the light from the LED light source 4D. The observer M1 is the person who views the location 2PL, 2PD. The points 2PL and 2PD are located at two points corresponding to the light extraction unit 3 in a plane including a straight line connecting the LED light sources 4L and 4D and the observer M1 and perpendicular to the exit surface 2PO. Fig. 6(c) is a view showing a state in which the light ray 61 in Fig. 6(b) when the side view 6(b) is guided by the side view and reaches the observer M1.

The light extraction unit 3 in Fig. 6(b) is viewed from the front It is a straight line and the section is a substantially semicircular groove. Further, Fig. 6(b) is an example in which the surface constituting the groove is formed by a mirror surface. In the spot 2PL, the light from the LED light source 4L advances toward the observer M1 as it is. On the other hand, the light system from the LED light source 4D advances in a direction different from the direction toward the observer M1. Therefore, the color of the observer M1 system point 2PL appears to be the illuminating color of the LED light source 4L. Based on the same phenomenon, the color of the observer M1 system location 2PD appears to be the color of the LED light source 4D, and a phenomenon in which a position-dependent color is observed occurs.

This phenomenon is two colors corresponding to the colors of the two-color LED light sources 4 (4L, 4D) on the surface of the light guide 2 in an illumination device in which two color LED light sources 4 (4L, 4D) are alternately arranged. The lines alternately occur as unevenness of the striped pattern. If the surroundings are directly illuminated by the light from the light guide 2, the appearance of the illumination device 1 is significantly impaired because the color unevenness is directly observed. Further, since the illumination device 1 also serves as a color separation illumination, there is a problem that a problem that the illumination target is not illuminated in the correct color occurs.

The method of solving the problem of color unevenness is to impart scattering property to the light extraction unit 3 in the same manner as the above-described line unevenness. That is, the present problem can be solved by using the light extracting portion 3 formed using the scattering ink described in the present invention. The case where the scattering characteristics are given will be described using FIG. 6(d). The symbol or the like used in the drawing means the same as FIG. 6(b). The light from the LED light source 4L is scattered by the light extraction unit 3 that prints ink in a line, and a part of the scattered light is emitted from the spot 2PL toward the observer M1. In addition, light from the LED light source 4D is also scattered in the light extraction portion 3, A portion of the light is emitted from the location 2PL toward the observer M1. Therefore, the emitted light from the spot 2PL is mixed with the light from the LED light source 4L and the LED light source 4D, and is directed toward the observer M1. The same phenomenon occurs at the location 2PD, and the light from the LED light source 4L and the LED light source 4D is mixed and directed toward the observer M1. Therefore, the observer M1 emits light from the locations 2PL and 2PD in the same color, and the color unevenness is suppressed. With regard to these phenomena, an illumination device having the light extraction unit 3 formed using ink was produced, and it was confirmed that the excellent unevenness was suppressed.

Next, with reference to FIG. 7, the dispersion with respect to the light extraction portion 3 will be described. The problem of the emission angle distribution of the illuminating device 1 related to the illuminance. In the case of the light ray ray 71, the main light emission direction when the first light extraction portion 3A is mirror-finished (the concave shape having a semicircular cross section) is used as an example of the case where the scattering is not performed. . The light ray 71 is guided to the light guide body 2 and guided to the surface emitting portion 2C, and the first light extraction portion 3A is specularly reflected and the light guiding condition is broken, and the surface 2CO is emitted, and the illumination device 1 is viewed from the center direction. What the observer M1 observes. At this time, the light does not reach the observer M2. Therefore, the observer M2 seems to be dark depending on the first light take-out portion 3A that is emitted. If the groove is mirror-finished, the amount of reflected light that is opposite to the direction of propagation is small, and most of the light is reflected in the direction of propagation. Therefore, the observer of the illumination device 1 is viewed in the direction in which the light propagates (the observer in the above example) M1), the light emitted from the illumination device 1 can be observed, but the observer who views the illumination device 1 on the opposite side to the direction (the observer M2 in the above example) cannot observe the light. More specifically, in Figure 7(a), the observer M2 is The semicircle of the illuminating device 1 which is the center of the illuminating device 1 looks darker, and the illuminating device 1 which is farther from the center looks brighter. This significantly reduces the degree of beauty and commerciality of the lighting device 1.

In addition, due to the angle of FD from the front direction (hereinafter referred to as Since a large amount of light is emitted in a direction in which the polar angle θ) is 50 degrees or more, the problem that the front direction FD of the illumination device 1 is darkened also occurs. These problems have become a significant problem when the light from the light guide 2 is directly illuminating the surroundings.

The most effective way to solve this problem is uneven line, In the same manner as the color unevenness, the light extraction unit 3 is provided with scattering properties. Fig. 7(b) is a view showing a main light emission direction when the light extraction portion 3 is given scattering property by using the light rays RAY 71 and 71'. In the light extraction unit 3 in the drawing, the light extraction unit 3 formed of the ink having scattering properties is used. When the scattering property is imparted to the light extraction unit 3, a part of the light incident on the light extraction unit 3 is emitted in various directions by scattering in accordance with the degree of scattering performance of the surface. Therefore, when the light extraction portion 3 is provided with the scattering property, the light system that is scattered and transmitted through the first light extraction portion 3A is also emitted in the direction of the observer M1 as shown by the light ray 71' of FIG. 7(b) (ray ray 71). However, due to scattering, it is also emitted toward the observer M2 (ray ray 71'). Therefore, the first light extraction portion 3A looks brighter from all directions, and the illumination device 1 looks brighter in any direction.

Further, by scattering, the light beam toward the front direction FD also increases, and is formed as an illumination device to obtain a balanced illuminance angle distribution. Regarding the change in the luminosity distribution due to the presence or absence of the scattering characteristic, the photograph in which the light extracting portion 3 is formed using the ink having the scattering property is shown in FIG. 7(c). The mirror 1 and the light extraction unit 3 were mirror-processed grooves (a concave shape having a semicircular cross section), and the light distribution characteristics of the illumination device 1 having no scattering property were actually measured. The horizontal axis of the graph of Fig. 7(c) indicates the angle Δ from the front direction FD, that is, the polar angle θ. The vertical axis indicates the normalized luminosity that is normalized to the maximum illuminance in each illuminating device. The result that the light extraction portion 3 is not imparted with scattering property is indicated by a dotted line, and the luminosity becomes maximum at about 60 degrees. On the other hand, the result of the scattering property in the light extraction unit 3 is indicated by a solid line, and the polar angle θ of the luminosity as the front direction is gradually decreased at 0 degrees. The irradiation toward the direction in which the polar angle θ is larger than 90 degrees is light that is directed toward the ceiling, and is formed as indirect light that is reflected by the ceiling and illuminates the surroundings. When the light extraction unit 3 is provided with scattering characteristics, it is formed to have a light distribution slightly wider than the Lambertian light distribution, and is formed as an appropriate light distribution characteristic as the illumination device 1. Therefore, the light extraction portion 3 is provided with scattering property, and the light is emitted from the light extraction portion 3 in all directions, whereby the illumination device 1 is seen to be brighter in any direction, and the light distribution characteristics required as the illumination device are achieved. Effect. Needless to say, the first light extraction unit 3A includes the second light extraction unit 3B, and it is extremely important to impart scattering properties to the surfaces of all the light extraction units 3, so that the above problems of all the illumination devices 1 can be solved.

As shown in the light extraction unit 3 of the present embodiment, the use of the scattered The light-removing portion 3 having the scattering property formed by the photographic ink achieves an effect of suppressing the above-described line unevenness and color unevenness and obtaining appropriate light distribution characteristics.

A method of forming the light extraction unit 3 using ink is There is screen printing. However, screen printing of a curved surface having a small radius of curvature is often difficult. The difficulty of production engineering mainly depends on the radius of curvature of the surface. set. For example, if the radius of curvature of the curved surface is greater than about 5000 mm, it will not cause particularly difficult production engineering.

The light guide 2 of the present embodiment has a three-dimensional shape. Face out The portion 2C has a large radius of curvature, so that screen printing can be performed. Since the propagation direction changing portion 2B has a small radius of curvature, it is difficult to perform screen printing. Therefore, it is preferable to perform printing by an inkjet method. At this time, it is preferable that the light extraction unit 3 that performs screen printing and the light extraction unit 3 that performs inkjet printing change the type of ink to perform optimum printing. That is, the light extraction unit 3 is formed using ink that varies depending on the location of the light guide 2. More specifically, the cross-sectional shape of the surface of the light guide body has a shape having two or more radii of curvature, and the material of the light extraction portion 3 formed on one surface thereof and the light extraction portion 3 formed on the other surface The materials are formed into different materials.

Further, in the present embodiment, since the light guide 2 has Since the portion is formed in a three-dimensional convex shape, the screen printing of the opposite surface emitting portion 2C is such that the light guiding body 2 has a convex shape in a three-dimensional shape, and in the convex direction (front direction FD), the light guiding body The outer surface (surface 2CO) of 2 is formed with the light extraction unit 3, and a relatively simple device can be printed on the entire surface 2CO. In addition, the effect of productivity improvement has also been achieved. Further, by forming the light extracting portion 3 using ink on the exit surface side (2CO), productivity can be improved. This is based on the fact that the propagation direction changing unit 2B does not interfere with the position of the printing device during printing. Further, from the viewpoint of design, the light extraction unit 3 can be disposed on the exit surface side (2CO) by forming the ink into the ink that is transmitted. It is based on the fact that if the ink that does not pass is on the exit side, the ink will become cloudy. Therefore, it is only placed on the surface side (2CI) facing the exit surface. The light extraction unit 3 that uses the ink that the light transmits is designed to achieve the effect of being arrangeable on the exit surface side (2CO).

Among them, optically, the ink is attached to the exit surface side. In the surface 2CO, since the light transmitted through the ink is formed to be close to the emission distribution of the Lambertian light distribution, the brightness of the light extraction unit 3 is approximately constant when viewed in any direction.

On the other hand, if the inkjet printing is in the propagation direction conversion section 2B, the material for inkjet is not strong against the cleaning agent such as the cleaning agent. Therefore, in this case, it is preferable to provide the second light extraction portion 3B on the inner surface 2BI of the light guide 2. .

Therefore, if screen printing and inkjet printing are combined, By arranging the light extraction unit 3 on the front and back surfaces of the light guide 2, screen printing can be simplified, and the problem of drug resistance can be solved.

Further, the surface emitting portion 2C is in the large area of the light guiding body 2 Therefore, by using ink having high scattering property, color unevenness and line unevenness are completely suppressed in most of the light guide body 2, and the second light extraction portion 3B located in the propagation direction converting portion 2B can also be injection molded. Other methods are formed. With this configuration, since the large-area surface emitting portion 2C occupies a large area in the light guide 2, it is relatively large, so that color unevenness and line unevenness are completely suppressed, and design is optimized. The configuration in which the second light extraction portion 3B is emitted to the outer direction OD achieves an effect of improving both the design property and the light distribution characteristics on the outer side.

Further, according to the shape of the light guide 2 of the bright device 1, etc. There is also a case where the second light extraction unit 3B of the propagation direction conversion unit 2B is not used. Light reflected by the reflective sheet 6 or the like is transmitted through the propagation direction converting portion 2B or the surface emitting portion 2C to propagate light in the outer direction. Further, the scattered transmitted light of the light extraction portion 3 also propagates in the outer direction. Therefore, the light distribution characteristics of the illumination device 1 can be roughly formed into a Lambertian light distribution or a light distribution characteristic wider than that, and it has been experimentally confirmed. However, the second light extraction unit 3B having the propagation direction conversion unit 2B obtains a wide light distribution characteristic, and the light toward the ceiling direction increases.

If the second light extraction unit of the propagation direction conversion unit 2B is not used 3B, the relationship between the light extraction unit 3 and the light guide 2 is such that the cross-sectional shape of the light guide 2 has a shape having two or more radii of curvature, and at least one surface having a minimum radius of curvature (ie, a surface) The light extraction unit 3 is disposed on the surface 2CI or the surface 2CO of the emission unit 2C.

In addition, if the composition is described in other terms, the face is emitted. The portion 2C has a first light extraction portion 3A that emits light in the light guide 2 and is emitted from the light guide 2 in substantially the same direction as the front direction FD, and the surface of the propagation direction conversion portion 2B is formed by injection molding. The formed molded body has a configuration in which the second light extracting portion 3B is not provided. According to this configuration, it is possible to suppress the color unevenness and the like, and it is possible to easily form the light extraction unit 3 in the light guide body 2 only by screen printing while obtaining predetermined light distribution characteristics, thereby achieving a simple production process. .

Further, if only the light exiting the surface emitting portion 2C is formed, the ink is taken out. In the portion 3, the propagation direction changing unit 2B is a portion that converts only the direction in which light travels. That is, the cross-sectional shape of the light guide body 2 has two or more pieces of music. The shape of the rate radius is such that the light extraction portion 3 is not formed on the surface having the largest radius of curvature. Further, the light extraction unit 3 is not formed on the surface having the smallest radius of curvature.

In addition, from a design point of view, if the reflectance is low When the outer cover 8 is formed, the second light extraction unit 3B is disposed in the propagation direction changing unit 2B, and the emitted light from the light extraction unit 3B is reflected by the outer cover 8 and is lost. Therefore, from the viewpoint of efficiency, it is preferable to have the light extraction portion 3B. The material having a low reflectance means that the reflectance is lower than that of the reflective sheet 6, the white-coated frame 7A or the substrate 5 covered with the white scattering film, or the color is not white, and is colored by silver or gold. s material. In other words, in the outer cover 8 of the material having a low reflectance, the surface of the propagation direction changing portion 2B is a molded body formed by injection molding from the viewpoint of efficiency, and the second light extraction portion 3B is not provided. Composition.

Further, in the light extraction unit 3, ink may not be used. On the other hand, irregularities are added to the surface by laser processing, and the light-scattering conditions of the transmitted light are destroyed by the scattering property of the unevenness, and the light is taken out. However, the light extraction portion 3 formed by using the ink is high in scattering property, and the color unevenness and the line unevenness suppression effect are higher in the light extraction portion 3 formed by using the ink. On the other hand, the formation of the second light extraction portion 3B of the propagation direction converting portion 2B is facilitated by laser processing.

Among them, the above is mainly explained by screen printing. The light extraction unit 3 is formed, but the present invention is not limited thereto, and may be formed by coating, vapor deposition, or the like. For example, UV curing, thermal curing, or the like may be performed by applying an ink such as a resin such as acrylic to form a light extraction unit. 3. In this case, it is preferable that the ink contains a scattering material. In this case, when a droplet such as a resin is dropped onto the propagation direction converting portion 2B to mold the light extraction portion 3, a material which is hardened by the droplet after the droplet is used may be used.

In addition, as shown in Figure 8, the cross-sectional shape can also be guided. The light body 2 has a shape such as a groove, and the shape is formed into the light extraction portion 3, and the surface 3AS of the shape is additionally provided with fine irregularities to have scattering properties, and is formed as the light extraction portion 3. However, when the light guide 2 is formed by injection molding, minute irregularities are applied to the mold, and it is necessary to transfer the minute irregularities of the mold to the light guide 2 during molding. The transfer property is weaker as the farther away from the resin injection port at the time of injection molding, and the scattering property of the light extraction portion 3 disposed at a position away from the gate is weak, and color unevenness and line are likely to occur. Uneven.

On the other hand, as shown in this embodiment, the use of the injection The portion other than the light extraction portion 3 is molded, and the light extraction unit 3 using the scattering ink is formed in the molded body, and the light guide 2 is produced, thereby being independent of the position of the resin injection port, that is, the gate. The light extraction unit 3 of the present embodiment achieves an effect of obtaining equally good scattering properties in all parts.

Further, for the above reason, if the position of the gate can be freely set, the gate can be disposed at the center of the light guide 2. As shown in the light guide 2 of the present embodiment, if the gate is disposed in the center of the light guide 2 as a circular shape and a substantially equilateral shape, the resin will be at a constant speed and the like during injection molding. Since the sexual expansion is achieved, the effect of forming defects is less likely to occur. Among them, the gate will be removed at the end, but in order to trace the gate, Alternatively, a part of the light guide body 2 may be removed together with the gate, and holes or the like may remain as a trace of the gate. Therefore, it is preferable to mount the other components on the light guide body to improve the design.

As shown in the illumination device 1 of the present embodiment, if it is illumination A part or all of the front side direction FD and a part of the outer side direction OD of the apparatus are configured as the light guide body 2, and the light extraction unit 3 can be directly viewed by the user, and the light from the light guide body 2 directly illuminates the surroundings. The configuration is such that the light guide body that forms the light extraction portion by using the ink that is transmitted by the light is used to suppress the above-described line unevenness, and if the illumination device has an LED light source having a different color, color unevenness is suppressed, and The light distribution from the illumination device can be a good distribution effect.

Next, the present embodiment will be described in detail with reference to FIG. A method of mounting the illumination device 1 to the ceiling 50 is described. Only the components related to the description are mainly described. First, as shown in FIG. 14(a), the fixture 51 is attached to the ceiling light fixture 52. Next, as shown in FIG. 14(b), the frame 7 to which the members other than the light guide 2, the outer cover 8, and the reflection cap 11 are fixed is attached to the fixture 51. Once installed, the power supply circuit 10 and the wiring 51B from the fixture 51 are connected to mount the reflective cap 11 to the frame 7.

Thereafter, the light guide 2 is attached to the frame 7A. The method As shown in Fig. 14 (c-2), the mounting portion 2G of the light guide 2 is inserted while the light guide fixing device 12 is slid. Fig. 14 (c-2) is a front view seen from the front direction FD. The mounting portion 2G of the light guide body 2 has three portions at the outer end portion of the light guide body 2, and correspondingly, a light guide body is also provided in the frame. Fixing fixture 12. When the light guide 2 is rotated in the direction of the arrow in the figure, the mounting portion 2G enters the light guide fixture 12, and the light guide 2 is fixed to the frame 7. Fig. 14 (c-1) shows a B-B' cross section in Fig. 14 (c-2). Finally, as shown in FIG. 14(d), the outer cover 8 is attached to the cover attaching portion 2GC of the light guide 2, and the attachment of the illuminating device 1 to the ceiling is completed.

Here, as seen from FIG. 14(c-2), the light guide 2 is The outermost portion in the outer direction is substantially circular, but there is a portion that is formed to protrude outward by the mounting portion 2G and the cover attaching portion 2GC. There is a case where light is emitted from the light guide 2 in correspondence with the protruding portion. Fig. 14 (e) is a cross-sectional view showing the periphery of the mounting portion 2G in an enlarged manner. In the figure, RAY 141 is an example of light emitted corresponding to the mounting portion 2G. The factor of light emitted by the light guide 2 depends on the R shape 2GR of the root of the mounting portion 2G. In Fig. 14 (c-2), when light is incident only on the portions of the mounting portion 2G and the cover mounting portion 2GC, there is a case where the unevenness is sensed. Therefore, as shown in FIG. 14(f), it is considered that a small flange 2GF is provided in a portion other than the mounting portion 2G and the cover mounting portion 2GC, and light having the same path as the RAY 141 is emitted from the entire circumference of the light guide 2. RAY142. Since the attachment portion 2G functions as an attachment portion, the smaller flange 2GF is smaller than the portion where the attachment portion 2G protrudes outward. On the other hand, since the R shape 2GR is equal to each other, the RAY 141 and the RAY 142 form light of the same path, and the appearance is substantially the same. By attaching the small flange 2GF between the mounting portions 2G (or arranging the R shape 2GR substantially over the entire circumference), it is possible to achieve an effect of improving the designability by obtaining substantially the same outgoing light over the entire circumference. Also, in smaller A part of the outer cover 8 is placed on the flange 2GF, whereby the strength of the outer cover 8 in the state of being attached to the light guide 2 can be improved.

This installation method is considered to be the simplest installer law. However, all the structures for solving the various problems described above, for example, the arrangement method of the LED light source 4, the structure of the light extraction unit 3, and the structure for imparting scattering characteristics do not depend on the mounting method.

<<Modification 1>>

In the present modification, an example of a scattering cover member 19 for scattering light emitted from the light guide 2 is disposed on the front surface of the light guide 2, and will be described with reference to FIG. 9. The scattering cover member 19 is added to the illumination device described in the first embodiment. In this example, an illumination device 1 having an overall white appearance is provided by the scattering cover member 19 while obtaining the effect of the thin uniform illumination obtained when the light guide 2 is used. Since the scattering cover member 19 is added, the outer cover 8 and the inner cover 9 are not required. The characteristics of the light guide 2 described in the first embodiment and the effects obtained by the features can be similarly obtained in this example.

For example, when using a plurality of colored LED light sources, the color is uneven. The problem is also to alleviate if the scattering cover member 19 is used. However, if the total light transmittance of the scattering cover member 19 is increased to reduce the light loss or to bring the distance between the scattering cover 19 and the light guide 2 closer, the problem of the color unevenness becomes an important issue.

Further, if the light is not uniformly emitted by the entire light guide body 2, This is projected on the scattering cover 19, and it is a problem that it is uneven.

Therefore, in the present configuration, the first embodiment is also provided. The characteristics of the light guide 2 of various effects described above are extremely important, and a thin illuminating device that emits the same effect and that emits light from the entire illumination device and illuminates the entire space from the floor direction to the side and the ceiling direction is provided.

"Second Embodiment"

An example of another illuminating device which is not described in detail in the above-described light guide body to which the light extracting unit 3 described in the first embodiment is applied will be described with reference to Figs. 10 and 11 . The illuminating device 1 shown in Figs. 10 and 11 is a type of illuminating device suspended by a ceiling 50, and is called a so-called Pendant illuminating device.

The same part or phase as in the first embodiment The parts with the same function are omitted. Fig. 10 shows an example in which the light guide 2 is curved, and Fig. 10(a) is a front view, which is viewed from the front direction FD. Fig. 10 (b) is a cross-sectional view taken along line C-C' of Fig. 10 (a). Any of the figures is a diagram focusing on the shape and configuration of the light guide 2. The front direction FD, the back direction BD, and the outer direction OD in the illumination device 1 are indicated by arrows in the figure.

Opposite to both end faces of the light guide body 2, alternately arranged 2 Colored LED light sources 4L, 4D. The LED light source is mounted on the substrate 5, and the substrate 5 is mounted on the light source cover 60. The light source cover 60 is fixed to the light guide 2, suspended by the spreader 61, and fixed to the power supply casing 62 in which the power supply circuit 10 is housed. The power supply frame 62 is suspended by the wiring and spreader 63, and the shape is changed from the first embodiment. The fixture 50 is fixed to the ceiling 50 by fixing the illuminating device 1 to the fixture 51 of the ceiling lamp holder 52.

The light emitted by the LED light sources 4L, 4D is made up of the incident surface 2A When incident, light is guided toward the center, scattered at the predetermined position, and the light guiding condition is broken, and the light guiding body 2 is emitted.

The lighting device 1 is also part or all of the front direction FD The outermost portion of the portion is a configuration of the light guide 2, and the user can directly view the light extraction portion 3, and directly illuminate the surroundings with the light from the light guide 2. Therefore, it is extremely important to introduce various configurations described in the first embodiment and to improve the performance of the illumination device 1. In particular, it is extremely important to introduce the characteristics of the light extraction unit 3 described in the first embodiment, to suppress the line unevenness and color unevenness, and to form a light distribution of the light distribution from the illumination device 1.

The first embodiment is also suitably applied to the illumination device 1 In the feature of the light extraction unit 3 described in the above aspect, it is effective to provide an illumination device that suppresses the occurrence of unevenness in the light guide body in accordance with the light source.

Figure 11 is a deformation of the suspension type lighting device shown in Figure 10. For example, the shape of the main light guide 2 is different from the arrangement of the LED light sources 4L, 4D. Only the main changed parts are explained below. Fig. 11(a) is a front view, viewed from the front direction FD. Fig. 11 (b) is a cross-sectional view taken along line D-D' of Fig. 11 (a). In this example, the light guide 2 has a shape in which a hole is drilled in the center of the disk, and the LED light sources 4L and 4D are disposed to face the end surface of the center hole. The central aperture is a hexagonal aperture in this example.

The light emitted by the LED light sources 4L, 4D is made up of the incident surface 2A Upon incidence, light is guided toward the outer direction OD, and is scattered by the light extraction portion 3 at a predetermined position to destroy the light guiding condition, and is emitted by the light guide 2.

The lighting device 1 is also part or all of the front direction FD The outermost portion of the portion is a configuration of the light guide body 2, and the user can directly view the configuration of the light extraction unit 3, and directly illuminate the surroundings with the light from the light guide 2. Therefore, it is extremely important to introduce the various configurations described in the first embodiment to improve the performance of the illumination device 1. In particular, it is extremely important to introduce the characteristics of the light extraction unit 3 described in the first embodiment, to suppress the line unevenness and color unevenness, and to make the light distribution from the illumination device 1 to be well distributed.

The first embodiment is also suitably applied to the illumination device 1 In the feature of the light extraction unit 3 described in the above aspect, it is effective to provide an illumination device that suppresses the occurrence of unevenness in the light guide body in accordance with the light source.

The illuminating device 1 of the present embodiment is an example of a light guide 2 The LED light source, the light source cover 60, the shape or arrangement of the power supply frame 62, the arrangement of the spreader 61, and the like can be variously modified. For example, the light source cover 60 may be fixed to the power supply housing, and another fixing member may be introduced. The present invention is not limited to such a shape or arrangement, and by introducing the features of the light extraction unit 3 described in the first embodiment, it is possible to suppress the above-described line unevenness and color unevenness, and to distribute the light distribution from the illumination device 1. Formed as a good distribution effect.

"Third Embodiment"

The use of the first embodiment will be described with reference to FIG. An example of another illumination device that is not described in detail in the light guide of any of the light extraction units 3. The lighting device 1 shown in Fig. 12 is an electric bulb type lighting device. Fig. 12 (a) is a perspective view of the lighting device 1 showing the appearance of the lighting device 1. The configuration of Fig. 12 (a) is a light guide body 2 that emits light, a light bulb housing 65 that houses a power supply circuit (not shown), and the like, and a lighting device 1 that is fixed to a lighting fixture and that is supplied with electric power. Metal port 64. The light guide 2 is transparent and is an example of an electric bulb called a so-called transparent bulb. In the case of a light bulb type illuminating device, it is difficult to define the front direction or the like, but each direction is defined by an arrow as shown in FIG. The back direction BD is the direction of the metal port, and the front direction FD is opposite to the back direction BD. The outer direction OD is substantially perpendicular to the front direction FD and is a direction outward from the center of the illumination device 1.

Figure 12 (b) is a cross section of the lighting device 1 of the present embodiment. Figure. The substrate 5 is disposed in the bulb frame 65, and the LED light source 4 is disposed on the substrate 5. The light guide 2 receives light from the LED light source 4 from the incident surface 2A, and guides the light along the surface of the light guide 2. The light is scattered by the light extraction unit 3 at a predetermined position and is emitted by the light guide 2.

The lighting device 1 is also part or all of the front direction FD The outermost portion of the portion is a configuration of the light guide 2, and the user can directly view the light extraction portion 3, and directly illuminate the surroundings with the light from the light guide 2. Therefore, it is extremely important to introduce the various configurations described in the first embodiment to improve the performance of the illumination device 1. In particular, the characteristics of the light extraction unit 3 described in the first embodiment are introduced, and the line unevenness and color are suppressed. It is extremely important that the light distribution from the illumination device 1 is formed into a good distribution.

The first embodiment is also suitably applied to the illumination device 1 In the feature of the light extraction unit 3 described in the above aspect, it is effective to provide an illumination device that suppresses the occurrence of unevenness in the light guide body in accordance with the light source.

Wherein, in each of the embodiments described above, the incident surface 2A is a flat surface, but the invention is not limited thereto, and the incident surface may have a function of causing light from the exit surface of the light source to enter the light guide 2 from the portion, and the light propagates in the light guide body. For example, a shape such as unevenness may be imparted to the incident surface 2A. An example of a surface different from a flat surface is shown in FIG. Fig. 13 (a) is a side view of the vicinity of the incident surface 2A of the light guide 2 of the first embodiment. Fig. 13 (b) is a cross-sectional view showing a portion indicated by F-F' in Fig. 13 (a). Fig. 13 (a) is a view of the vicinity of the incident surface 2A viewed from the direction of the arrow AIN shown in Fig. 13 (b). This example is an example in which the incident surface 2A has irregularities, and is convex (or concave) in a direction parallel to the outer direction. In the incident surface 2A, a configuration in which a convex (or concave) shape is provided in a direction parallel to the outer direction has a light incident on the incident surface 2A extending in a direction orthogonal to a direction in which the convex (or concave) shape extends. Since the light is emitted, the light emitted from the adjacent LED light sources (4D, 4L) is easily mixed in a direction orthogonal to the outer direction, and the effect of suppressing color unevenness or line unevenness is achieved.

Wherein, in each of the embodiments described above, the light source system The description is the LED light source 4, but is not limited thereto, and organic light emission can also be used. Other light sources such as an OLED (Organic Light Emitting Diode).

In the above embodiments, the description is The outer shape of the various light guides 2 is not limited to those described above, and is a light guide body having a plane formed by a circle, a quadrangle, a polygon, an arbitrary curve, an arbitrary fold line, and the like, or The outer shape of an arbitrary light guide such as a three-dimensional light guide body has an effect of improving the performance of the lighting device 1 in various configurations described in the first embodiment. In particular, the light extraction unit 3 described in the first embodiment is characterized in that it provides an outer shape of an arbitrary light guide body, suppresses unevenness in the light guide body corresponding to the light source, and has an effect of a well-designed illumination device. .

In each of the embodiments described above, each implementation The features described in the modalities may also be independently applicable, but may also be used in appropriate combination.

The embodiments described above are for explaining the present invention. The specific examples shown in the drawings are not intended to limit the invention to the embodiments. For example, the shape and configuration of each member shown in each of the above embodiments should be appropriately designed or optimized as necessary to satisfy the function of the member.

1‧‧‧Lighting device

2‧‧‧Light guide

2A‧‧‧Incoming surface

2B‧‧‧Transmission direction transformation

2BI, 2BO, 2CI, 2CO‧‧‧ face

2C‧‧‧Outlet Department

3‧‧‧Light extraction department

3A‧‧‧1st light extraction department

3B‧‧‧2nd light extraction department

4‧‧‧LED light source

4A‧‧‧Outlet

5‧‧‧Substrate

6‧‧‧Reflecting sheet (reflecting member)

7‧‧‧Frame

7A, 7B‧‧‧ Frame on the front side (reflective member)

7BE‧‧‧ end

8‧‧‧Outer cover (reflecting member)

9‧‧‧ Inner cover (reflecting member)

10‧‧‧Power circuit

10A‧‧‧Wiring

11‧‧‧Reflex cap

50‧‧‧ ceiling

51‧‧‧ Fixtures

51A‧‧‧Protruding

51B‧‧‧Wiring

52‧‧‧ Ceiling light line seat

Claims (6)

An illumination device comprising: a plurality of light sources having an exit surface for emitting light; and an illumination device for guiding a light guide through which light emitted from an exit surface of the plurality of light sources enters, wherein the light guide system has a light extraction unit for emitting light to the outside of the light guide body, wherein when the illumination device sets the direction in which the main light is emitted as the front direction, a part or all of the outermost portion of the illumination device in the front direction is the aforementioned The light guide body is formed by using ink that transmits light and has scattering properties. The illumination device according to claim 1, wherein the light guiding system forms a portion other than the light extraction portion by injection molding, and a light extraction portion using the ink is formed in the molded body. The illuminating device according to claim 1, wherein a direction perpendicular to a front direction of the illuminating device and a direction outward from a center of the illuminating device is an outer direction, and is substantially perpendicular to the front direction When the direction from the outer side of the illuminating device toward the center of the illuminating device is the inner direction, the light guiding system has a curved portion, that is, a propagation direction converting portion, and the propagation direction changing portion is connected to the inner direction. The portion that is substantially in the same direction is also the shape of the surface exit portion. The illumination device of claim 3, wherein the propagation direction changing unit has light that propagates in the light guide body, The second light extraction portion that emits the light guide body in substantially the same direction as the outer direction, wherein the surface emission portion has light that propagates through the light guide body, and the light guide body is substantially the same as the front surface direction The first light extraction unit that is emitted in the direction. The illuminating device according to claim 1, wherein the frame having the plurality of light sources and the light guide body is provided on the outer side of the light guide body and corresponding to a portion where the light guide body is fixed to the frame An outer cover that does not pass through. The illumination device of claim 2, wherein the ink has a scattering material for scattering light, and the thermal conductivity or the thermal emissivity of the scattering material is higher than a thermal conductivity or a thermal emissivity of the molded body. .