JP2012209049A - Led lighting device and lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting unit having a columnar portion with a new appearance that is excellent in visibility from the side surface direction and having improved use efficiency of light emitted from an LED light source.
An LED light source and a lens body arranged in front of an irradiation direction of the LED light source, the lens body being positioned on the LED light source side and having a central incident surface arranged on the LED optical axis. The back surface and the front surface provided with a plurality of columnar portions on the side opposite to the LED light source side are integrated. The central incident surface is an incident surface that converts in a direction parallel to the LED optical axis, and the periphery of the central incident surface protrudes closer to the LED light source than the central incident surface, and includes a rotating surface centered on the LED optical axis. The columnar portion includes an incident surface and a peripheral total reflection surface, and the columnar portion includes a plurality of columnar light guide portions having a central axis parallel to the LED optical axis. It is characterized by that.
[Selection] Figure 1

Description

  The present invention relates to an LED illumination device including a lens that emits light from a plurality of columnar portions formed on a light guide lens emission surface side surface using an LED (light emitting diode) as a light source, and the lens.

  In recent years, various illumination devices using LEDs as light sources have been put into practical use. In general, LEDs are roughly classified into so-called bullet type and surface mount type, and each has predetermined directivity. Moreover, in order to make light emission from the LED have a predetermined light distribution according to the use of the lighting device, various lenses are arranged on the front surface of the LED.

  As an illuminating device using this kind of lens, there exists patent document 1 as a thing at the time of applying to a vehicle lamp, for example. The vehicular lamp of Patent Document 1 includes a central light source, first and second peripheral light sources disposed on both sides of the central light source, and a multi-light source control lens. A central incident surface that converts light into parallel light, a central exit surface that diffuses light emitted from the central incident surface, a first peripheral incident surface disposed on the optical axis of the first peripheral light source, and a first peripheral incident surface The irradiation light of the first peripheral light source incident from the first peripheral light source is converted into parallel light, and the first total reflection surface totally reflected on the first peripheral emission surface is parallel to the irradiation light of the first peripheral light source incident from the first peripheral incident surface. The second total reflection surface that converts to light and totally reflects on the second peripheral exit surface, and the irradiation light of the second peripheral light source incident from the second peripheral entrance surface is converted into parallel light, and is totally reflected on the second peripheral exit surface. The irradiation light of the second peripheral light source incident from the third total reflection surface to be reflected and the second peripheral incident surface is converted into parallel light. Comprising a fourth total reflection surface for totally reflecting the first peripheral exit surface. This provides a vehicular lamp in which the luminous flux utilization rate hardly decreases even if it is downsized.

The inventor has applied for a lighting device in which a plurality of columnar portions are arranged on the exit surface of a light guide lens (Japanese Patent Application No. 2010-270499). According to this prior application, when the light guide lens is viewed from the direction of the optical axis of the light source, the tip of the columnar part that is disposed near the optical axis of the light source and emits weak light is separated from the optical axis of the light source. It is possible to provide an illuminating device that is arranged at a position and can be suppressed from appearing darker than a tip portion of a columnar portion from which strong light is emitted.
JP 2010-73652 A

  However, the illumination device disclosed in Patent Document 1 has a defect that the output surface is flat and the visibility and appearance from the lateral direction of the illumination device itself are poor.

  Further, in the case of the above-mentioned prior application, since the columnar portion is provided on the emission surface, the visibility and appearance from the lateral direction are superior to those of Patent Document 1, but light is emitted from locations other than the columnar portion, There was a drawback that the appearance at the time of lighting was impaired.

  This invention is made | formed in view of such a situation, and it aims at providing the illumination device of the new appearance which reduced the light emission from locations other than a columnar part.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an illumination unit including an LED light source and a lens body arranged in front of an irradiation direction of the LED light source, and the LED light source includes LED light. The lens has an illuminance distribution in which the light intensity of the light emitted from the LED light source decreases as the angle formed with the axis increases, and the lens body is located on the LED light source side and is disposed on the LED optical axis. A back surface provided with a surface and a front surface provided with a plurality of columnar portions on the opposite side to the LED light source side are integrated, and the central incident surface allows irradiation light from the LED light source to be parallel to the LED optical axis. The LED light source side to be converted is an incident surface made up of a rotating surface or a composite surface centered on the LED optical axis, and the periphery of the central incident surface protrudes toward the LED light source side from the central incident surface, LED light And a peripheral total reflection surface disposed around the peripheral incident surface, the peripheral total reflection surface being irradiated from the LED light source incident from the peripheral incident surface It is a curved surface that converts light in a direction parallel to the LED optical axis and totally reflects, and the columnar part is a central columnar part located on the LED optical axis, and a first peripheral columnar part adjacent to the central columnar part The central columnar part has a root part and a tip part located on the LED optical axis, and the side surface is an inclined surface inclined at an angle of 1 degree or more with the LED optical axis toward the emission direction. The front end portion is formed with a plurality of exit surfaces, and the first peripheral columnar object is disposed at a position corresponding to the central incident surface and / or the peripheral total reflection surface, and is in contact with the root portion of the central columnar portion. Forming a first peripheral columnar base and a plurality of emission surfaces; An emission surface, an inclined side surface that is inclined at an angle of 45 degrees or less with respect to the LED optical axis toward the emission direction, and a tip portion having a plurality of emission surfaces. The emission surface has a target shape centered on a tip portion intersecting the LED optical axis, and the emission surface of the first peripheral columnar object is a vertex other than the center position of the tip portion of each first peripheral columnar object. The LED illumination unit is characterized in that it is an astigmatism target shape, and is an asymmetry position centering on the LED optical axis different from the apex of the tip of the adjacent first peripheral columnar object. I will provide a.

  Further, the LED lighting unit is located on the opposite side of the peripheral total reflection surface around the first peripheral columnar object, and a second peripheral columnar root part in contact with the root part of the first peripheral columnar object, , An emission surface formed with a plurality of emission surfaces, an inclined side surface inclined at an angle of 45 degrees or less with respect to the LED optical axis toward the emission direction, and a tip portion having a plurality of emission surfaces It is preferable to arrange | position the 2nd surrounding columnar thing provided with.

  According to the present invention, since the columnar portions are arranged in close contact with each other, it is possible to reduce the emitted light from locations other than the columnar portions. Further, by providing the columnar portions closely, it is possible to provide a lighting device with a new appearance that is excellent in visibility from the side surface direction.

FIG. 1 is a perspective view of an LED lighting unit according to an embodiment of the present invention. FIG. 2 is a front view of the illumination unit shown in FIG. FIG. 3 is a cross-sectional view taken along line AA of the lighting unit shown in FIG. FIG. 4 is a cross-sectional view taken along line AA of the lighting unit shown in FIG. FIG. 5 is a schematic cross-sectional view showing an optical path in the cross section shown in FIG. FIG. 6 is a schematic front view showing the relationship between the columnar part and the total reflection surface in a front view. FIG. 7 is a schematic cross-sectional view of the LED lighting unit according to the second embodiment.

  Hereinafter, an LED lighting unit according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an LED lighting device according to an embodiment of the present invention. FIG. 2 is a front view of the illumination unit shown in FIG. 3 is a cross-sectional view taken along line AA of the lighting unit shown in FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA of the lighting unit shown in FIG.

  The LED lighting unit 100 according to the present embodiment is applied to, for example, a vehicular signal lamp such as a tail lamp or general lighting other than a vehicular signal lamp. As shown in FIGS. 1, 2, 3, and 4, an LED light source 10 and a lens body 20 positioned in front of the LED light source 10 in the irradiation direction are provided. For example, the LED light source 10 is accommodated in a housing (not shown). An outer cover that covers these is provided in front of the lens body 20 to provide a lighting device.

  As shown in FIGS. 3 and 4, the LED light source 10 is, for example, an LED package in which a single color or a plurality of color LED chips (light emitting diode chips) are molded with one or a plurality of silicone resins and packaged. The light emitting unit 11 and the mounting substrate mounting unit 12 are provided.

  The LED light source 10 has a Lambertian light distribution pattern that emits strong light at the center in the emission direction and decreases in intensity as it moves away from the LED optical axis L. The LED light source 10 is not limited to an LED package, but may be an LED chip.

  A lens body 20 made of a translucent material is disposed in front of the LED light source 10 in the irradiation direction. The lens body 20 is integrally formed of a light-transmitting resin material such as acrylic or polycarbonate. The periphery of the lens body 20 is air, that is, a gas having a refractive index of 1.0, and the lens body 20 is a resin having a refractive index higher than 1.0, for example, a resin having a refractive index of about 1.5.

  As shown in FIGS. 3 and 4, the rear surface 30 of the lens body 20, that is, the irradiated surface on the side facing the light emitting unit 11 of the LED light source 10, has a central incident surface 31, a peripheral incident surface 32, and a peripheral total reflection surface 33. Is formed.

  The light incident from the central point of the LED light emitting unit 11 having a curved surface convex toward the LED light source 10 formed at a position intersecting the LED optical axis L is refracted on the surface of the central incident surface 31. Later, the lens body 20 enters and guides the lens body 20. . Preferably, the light beam thus guided is a convex curved surface parallel to the LED optical axis L. Specifically, the light beam emitted from the center point of the LED light emitting unit 11 is refracted according to Snell's law at the intersection line when the central incident surface 31 is cut along a plane passing through the LED optical axis L, and the LED optical axis L A curve refracting in a parallel direction is calculated, and the curve is defined as a rotation surface obtained by rotating around the LED optical axis L. By setting it as such a rotation surface, the irradiation light from the LED light source 10 can be efficiently converted in a direction parallel to the LED optical axis L. Further, the central incident surface 31 may be a complex surface composed of a minute plane or a curved surface with the rotation surface as a reference surface instead of the above rotation surface. By using a composite surface, the amount of light incident on the central incident surface 31 can be adjusted.

  Around the central incident surface 31, a peripheral incident surface 32 that protrudes further toward the LED light source than the central incident surface 31 is formed continuously with the central incident surface 31. The peripheral incident surface 32 allows the irradiation light from the LED light source 10 to enter and refract the light toward the peripheral total reflection surface 33. Therefore, when a light beam emitted from the center of the light emitting unit 11 reaches the peripheral incident surface 32 and is incident, it is set to an angle that does not become a critical angle so as not to cause total reflection, and is removed from the mold during injection molding. An inclined surface is set in consideration of the gradient. In the present embodiment, it is an inclined surface that opens several degrees with respect to the LED optical axis L, and is formed as a rotating surface obtained by rotating around the LED optical axis L.

  Around the outer periphery of the peripheral incident surface 32, a peripheral total reflection surface 33 is formed continuously with the peripheral incident surface 32. The peripheral total reflection surface 33 is disposed with an inclined surface having an angle at which light incident into the lens body 20 from the peripheral incident surface 32 is totally reflected at the interface of the peripheral total reflection surface 33. Specifically, a light beam emitted from the central point of the LED light emitting unit 11 tracks a light beam incident from the peripheral incident surface 32, and air having a small refractive index from the lens body 20 having a large refractive index at the interface of the peripheral total reflection surface 33. An inclination curve having an angle that causes total reflection when light travels inward is obtained, and the inclination curve is formed as a rotation surface obtained by rotating about the LED optical axis L.

  The top 34 connecting the peripheral incident surface 32 and the peripheral total reflection surface 33 is provided at a position closest to the LED light source 10 in the back surface 30 of the lens body 20 as shown in FIGS. Further, the top 34 is positioned outside the side end of the light emitting unit 11. Thereby, it becomes possible to supplement most of the light irradiated from the light emission part 11 with the center incident surface 31 and the surrounding incident surface 32, and can improve the utilization efficiency of the irradiation light of the LED light source 10. FIG.

  The front surface 40 of the lens body 20, that is, the surface opposite to the back surface 30 of the lens body 20, from a plurality of columnar light guides extending in a direction parallel to the LED optical axis L as shown in FIGS. The columnar portion 41 is integrally formed. Moreover, in this Embodiment, each columnar light guide part comprises hexagonal frustum shape, and it arrange | positions so that the adjacent columnar light guide part may closely_contact | adhere.

  First, the center columnar part 42 in the columnar part 41 is demonstrated.

  The central columnar portion 42 is composed of a columnar light guide portion positioned on the LED optical axis L, and the central axis of the columnar light guide portion is substantially parallel to the LED optical axis L. A columnar part emission surface 45 is formed at the tip end part 42 b, and light guided through the columnar light guide part 42 is emitted from the columnar part emission surface 45 in the irradiation direction of the LED illumination unit 100. The front end portion 42b of the central columnar portion 42 has a smaller diameter than the root portion 42a. That is, it is a tapered hexagonal frustum, and its side surface 42c is inclined at an angle of 1 degree or more and less than 45 degrees with respect to the LED optical axis in the emission direction.

  As shown in FIGS. 1 and 2, a plurality of columnar part emission surfaces 45 are formed at the tip end part 42 b of the central columnar part 42. As shown in FIGS. 2, 3, and 4, the tip 42 b is disposed on the LED optical axis L. In this embodiment, the central axis of the columnar light guide and the LED optical axis L are coaxial, and the emission surface vertex 46 is also disposed on the LED optical axis L. Here, in the present embodiment, the emission surface vertex 46 refers to the vertex that is the most distal end among the plurality of columnar portion emission surfaces 45 provided at the distal end portion 42b. As shown in FIG. 1 and FIG. 2, the plurality of columnar part exit surfaces 45 are composed of six triangles in a plan view and have a regular hexagonal shape in a front view. The exit surface vertex 46 is located at the center point of the regular hexagon. That is, as shown in FIGS. 3 and 4, the columnar part exit surface 45 is formed as an inclined surface having the exit surface apex 46 as an apex. The angle of inclination with respect to the LED optical axis L can be adjusted as appropriate so that a light distribution pattern according to the purpose is obtained, whereby the emission direction and the spread of the irradiation area can be adjusted.

  FIG. 5 is a schematic cross-sectional view showing an example of a light beam passing through the columnar portion 41 in the cross section shown in FIG. In FIG. 5, an arrow L <b> 1 indicates an example of a light beam that passes through the central columnar section 42. Of the light emitted from the LED light source 10, the light that has entered the lens body 20 from the central incident surface 31 is converted into a direction parallel to the LED optical axis L at the central incident surface 31 and travels straight. In the central columnar portion 42, light incident from the central incident surface 31 travels from the root portion 42a toward the distal end portion 42b, and is emitted from the columnar portion emission surface 45 of the distal end portion 42b into the air. An optical system that enters from the central incident surface 31 and is converted into light parallel to the LED optical axis L and then exits through the columnar portion is referred to as a central optical system. In the present embodiment, the base part 42a of the central columnar part 42 and the size of the central incident surface 31 are almost the same. Therefore, almost all of the light incident from the central incident surface 31 passes through the central columnar portion 42, and the utilization efficiency of the light incident on the central incident surface 31 is increased. The base part 42 a of the central columnar part 42 may be made smaller than the size of the central incident surface 31.

  Next, the first peripheral columnar portion 43 that is a peripheral columnar light guide adjacent to the central columnar portion 42 will be described. FIG. 6 is a schematic front view showing the relationship between the columnar portion and the total reflection surface in a front view.

  The first peripheral columnar section 43 is a peripheral columnar light guide section adjacent to the central columnar section 42. In the present embodiment, six columnar light guide sections are arranged as shown in FIGS. Yes. The base part 42a of the central columnar part 42 has a hexagonal shape, and as shown in FIG. 6, the root parts of the six first peripheral columnar parts 43 are closely arranged so as to contact each side of the hexagon. ing. Each columnar light guide is provided so that its central axis is parallel to the LED optical axis L. Further, like the central columnar portion 42, the tip portion has a smaller diameter than the root portion. That is, it is a tapered hexagonal frustum, and its side surface is inclined at an angle of 1 degree or more and less than 45 degrees with respect to the LED optical axis toward the emission direction as shown in FIG.

  Similarly to the front end portion 42b of the central columnar section 42, the front end section of each first peripheral columnar section 43 is composed of a plurality of triangular columnar section exit surfaces, and has a hexagonal shape when viewed from the front. Further, it has an exit surface vertex 47. The exit surface vertex 46 of the first peripheral columnar portion 43 is located at the center point of the regular hexagon and is disposed on the LED optical axis L. The exit surface vertex 47 of each first peripheral columnar portion 43 is shown in FIG. Thus, it is not the center point of each first peripheral columnar portion 43. In other words, a plurality of columnar part emission surfaces are formed so as to be located away from the central axis of each first peripheral columnar part 43. Further, the position of the emission surface vertex 47 is arranged so as to be non-target so as not to be a rotation target around the LED optical axis L. By making it non-target, it is possible to reduce variations in overall illuminance while suppressing the occurrence of regular distribution in illuminance.

  FIG. 5 shows an example of a light beam passing through the first peripheral columnar portion 43 by an arrow L2. Of the light emitted from the LED light source 10, the light enters from the peripheral incident surface 32, is internally reflected by the peripheral total reflection surface 33, is converted into a direction parallel to the LED optical axis L, and proceeds. In the first peripheral columnar portion 43, the light beam L2 is emitted from the columnar portion emission surface at the tip portion into the air. An optical system that enters from the peripheral incident surface 32 and is internally reflected by the peripheral total reflection surface 33 and passes through the columnar portion is referred to as a first optical system.

  In the present embodiment, the root portion of the first peripheral columnar portion 43 adjacent to the root portion of the central columnar portion 42 is formed at a position corresponding to the peripheral incident surface 32. Thereby, the area | region where the light parallel to LED optical axis L which advances to the LED optical axis L direction from the position of the peripheral incident surface 32 does not exist, ie, the area | region which becomes dark can be minimized. Further, by providing a position where the root portion 42a of the first peripheral columnar portion 43 and the root portion 42a of the central columnar portion 24 contact each other at a position corresponding to the peripheral incident surface, the light toward the adjacent root portion is reduced, and the light Loss can be reduced.

  Next, the second peripheral columnar portion 44 that is a peripheral columnar light guide adjacent to the outside of the first peripheral columnar portion 43 will be described.

  The second peripheral columnar section 44 is a peripheral columnar light guide section adjacent to the outside of the first peripheral columnar section 43. In the present embodiment, 12 columnar sections are provided as shown in FIGS. A light guide is arranged. The base part of each columnar light guide part of the first peripheral columnar part 43 has a hexagonal shape, and the second peripheral columnar parts 44 are closely arranged so as to contact each side. Each columnar light guide is provided so that its central axis is parallel to the LED optical axis L. Further, like the central columnar portion 42, the tip portion has a smaller diameter than the root portion. That is, it is a tapered hexagonal frustum, and its side surface is an inclined surface inclined at an angle of 1 degree or more and less than 45 degrees with respect to the LED optical axis as shown in FIG.

  The distal end portion of each second peripheral columnar portion 44 is also composed of a columnar portion exit surface having a plurality of triangles in plan view, like the distal end portion 42 b of the central columnar portion 42, and has an exit surface vertex 46. Similarly to the emission surface vertex 47 of the first peripheral columnar portion 43, the emission surface vertex 48 of the second peripheral columnar portion 44 is also arranged to be non-target so as not to be a rotation target around the LED optical axis L. Yes. By making it non-target, it is possible to reduce variations in overall illuminance while suppressing the occurrence of regular distribution in illuminance.

  FIG. 5 shows an example of a light beam passing through the second peripheral columnar portion 44 by an arrow L3. Of the light emitted from the LED light source 10, the light enters from the peripheral incident surface 32, is internally reflected by the peripheral total reflection surface 33, is converted into a direction parallel to the LED optical axis L, and proceeds. In the second peripheral columnar portion 44, the light beam L3 is emitted from the columnar portion emission surface at the tip portion into the air. That is, the optical system that is incident from the peripheral incident surface 32 and is internally reflected by the peripheral total reflection surface 33 and passes through the columnar portion forms a first optical system.

  The light beam L1 of the central optical system, the light beam L2 and the light beam L3 of the first optical system are emitted from the tip of the columnar section 41 into the air. At this time, the columnar part exit surfaces of the respective columnar light guides have different sizes and inclinations as shown in FIGS. As described above, by arranging the plurality of columnar portion emission surfaces at random, it is possible to reduce unevenness in light emission when the LED illumination unit 100 is viewed.

  Further, in the present embodiment, the periphery of the central columnar portion 42 is doubly surrounded by the first peripheral columnar portion 43 and the second peripheral columnar portion 44. However, the present invention is not limited to this and may be triple or more. . The outer side of the outermost second peripheral columnar portion 44 is provided so as to be positioned on the outer peripheral edge 33a of the peripheral total reflection surface 33 as shown in FIG. Further, the first peripheral columnar portion 43 may be formed at a position corresponding to the central incident surface 31 so that the central columnar portion 42 and the first peripheral columnar portion 43 become a central optical system.

  According to the present embodiment, almost all of the light emitted from the LED light source 10 can enter the lens body 20 from the back surface 30. The light incident on the lens body 20 is converted in a direction parallel to the LED optical axis by the central incident surface or the peripheral total reflection surface 33. In the central optical system, most of the light emitted from the LED light source 10 can be captured and emitted from the central columnar part into the air. Also in the first optical system, since the columnar part is closely arranged at a position corresponding to the surrounding total reflection surface, it is possible to reduce the emitted light from a place other than the columnar part. Further, by providing the columnar portions closely, it is possible to provide a new-looking lighting device that is excellent in visibility from the side surface direction.

  Further, it is preferable that the peripheral total reflection surface 33 has an inclination angle that does not become an angle parallel to the light incident on the lens body 20 through the peripheral incident surface 32. By doing so, it is possible to prevent a portion that becomes dark when the lens body 20 is viewed from the front. The LED light source 10 is desirably provided within a range of 1/2 · r, more preferably 1/4 · r from the center of the lens body. Here, r is the distance from the center of the lens body 20 to the outermost periphery of the columnar portion 41. By doing in this way, the irradiation light from a LED light source can be used effectively.

  Furthermore, in order to suppress luminance unevenness, the columnar lens from which the light of the strong intensity portion of the light from the LED light source 10 is guided is lowered in height or is not inclined with respect to the optical axis. It is better to increase the area of the light-emitting part by extending to. By doing in this way, the area of a light emission part can be made small and a brightness nonuniformity can be suppressed. In addition, it is preferable that the emission surface at the tip of the columnar part is directed to various angles and directions. This is because the position that appears shining when the line of sight is moved can be changed.

Next, the LED lighting unit 200 of 2nd Embodiment is demonstrated.
FIG. 7 is a schematic sectional view showing a second embodiment of the present invention.

  In the first embodiment, the LED illumination unit 100 including one LED light source 10 and one lens body 20 is used. However, in this embodiment, three LED light sources are provided for one lens body 220. 211, 212, and 213. The rear surface 30 of the lens body 220 includes a central incident surface 31, a peripheral incident surface 32, and a peripheral total reflection surface 33 corresponding to each LED light source. The front surface 40 includes a plurality of columnar light guides.

  A central columnar section 242 is disposed on the front surface corresponding to the central LED light source 212 to form a central optical system. In addition, a plurality of columnar light guides are formed in close contact with the front surface corresponding to the peripheral total reflection surface 33 so as to form a first optical system.

  In the front surfaces corresponding to the left LED light source 211 and the right LED light source 213 in FIG. 7, columnar light guides having parallel central axes that are not coaxial with the respective LED optical axes are arranged, and the central optical system and the first light source are arranged. Columnar portions 241 and 243 forming an optical system are formed. In addition, a columnar light guide is disposed on the front surface corresponding to the peripheral total reflection surface 33 so as to form the first optical system.

  As described above, according to the LED illumination unit of the present embodiment, almost all of the light emitted from the LED light sources 211, 212, and 213 can be incident into the lens body 220 from the back surface 30. The light incident on the lens body 220 is converted in a direction parallel to the LED optical axis by the central incident surface 31 or the peripheral total reflection surface 33. In the central part optical system, most of the light emitted from the LED light sources 211, 212, and 213 can be taken and emitted into the air through the central columnar part. Also in the first optical system, since the columnar part is closely arranged at a position corresponding to the surrounding total reflection surface, it is possible to reduce the emitted light from a place other than the columnar part. Further, by providing the columnar portions closely, it is possible to provide a new-looking lighting device that is excellent in visibility from the side surface direction.

  The above embodiment is merely an example in all respects. For example, the peripheral incident surface and the peripheral total reflection surface may be provided in an annular shape around the LED optical axis L. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

100, 200 LED illumination unit 10, 211, 212, 213 LED light source 11 Light emitting unit 12 Mounting substrate mounting unit 20, 220 Lens body 30 Rear surface 31 Central incident surface 32 Peripheral incident surface 33 Peripheral total reflection surface 34 Top 40 Front surface 41 Columnar portion 42 Central columnar portion 43 First peripheral columnar portion 44 Second peripheral columnar portion 45 Columnar portion exit surface 46 Emitting surface vertex of the central columnar portion 47 Emitting surface vertex of the first peripheral columnar portion 48 Emitting surface vertex of the second peripheral columnar portion L LED optical axis

Claims (2)

An illumination unit comprising an LED light source and a lens body arranged in front of the irradiation direction of the LED light source,
The LED light source has an illuminance distribution in which the intensity of light emitted from the LED light source decreases as the angle formed with the LED optical axis increases,
The lens body is located on the LED light source side, and a back surface having a central incident surface disposed on the LED optical axis and a front surface having a plurality of columnar portions on the opposite side to the LED light source side are integrated. And
The central incident surface is an incident surface composed of a rotational surface or a compound surface centered on the LED optical axis convex to the LED light source side that converts irradiation light from the LED light source in a direction parallel to the LED optical axis,
Around the central incident surface, a peripheral incident surface that protrudes closer to the LED light source than the central incident surface and consists of a rotating surface with the LED optical axis as the center, and a peripheral total reflection disposed around the peripheral incident surface With a surface,
The peripheral total reflection surface is a curved surface that totally reflects by converting the irradiation light from the LED light source incident from the peripheral incident surface into a direction parallel to the LED optical axis,
The columnar part includes a central columnar part located on the LED optical axis, and a first peripheral columnar part adjacent to the central columnar part,
The central columnar portion has a root portion and a tip portion located on the LED optical axis, and a side surface is an inclined surface that is inclined at an angle of 1 degree or more with respect to the LED optical axis toward the emission direction. A plurality of emission surfaces are formed in
The first peripheral columnar object is disposed at a position corresponding to the central incident surface and / or the peripheral total reflection surface, and includes a first peripheral columnar root part in contact with a root part of the central columnar part, and a plurality of emission surfaces An emission surface formed with, an inclined side surface that is inclined at an angle of 45 degrees or less with the LED optical axis at the central columnar portion side surface or more toward the emission direction, and a tip portion having a plurality of emission surfaces,
The emission surface of the central columnar portion is a target shape centered on a tip portion intersecting the LED optical axis,
The exit surface of the first peripheral columnar object has an astigmatism shape whose apex is a position other than the center position of the front end portion of each first peripheral columnar object, and the front end portion of the adjacent first peripheral columnar object The LED illumination unit, wherein the LED illumination unit has a non-target position centered on the LED optical axis different from the apex.   Around the first peripheral columnar object, a second peripheral columnar root portion that is located on the opposite side of the peripheral total reflection surface and is in contact with the root portion of the first peripheral columnar object, and a plurality of emission surfaces are formed. A second peripheral columnar body comprising an emission surface, an inclined side surface that is inclined at an angle of 45 degrees or less with the LED optical axis at the side of the central columnar portion toward the emission direction, and a tip portion having a plurality of emission surfaces. The LED lighting unit according to claim 1, wherein the LED lighting unit is arranged.

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