JP2012199072A - Lighting device - Google Patents

Abstract

Provided is an illumination device that can irradiate light to a side surface or a rear surface direction and is easy to manufacture.
A lighting device includes a base material 2 having a front flat portion 2a, a light source 6 provided on the front flat portion, and a light-transmitting region that covers at least the front surface of the light source and emits light emitted from the light source to the outside. A translucent cover 4 having an optical control member 7 that covers the translucent cover and controls the transmission of light.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a lighting device using a light source mounted on a plane such as a light emitting diode (LED).

  Conventionally, incandescent bulbs that use light emitted by the heat of filaments and fluorescent lamps that emit ultraviolet light-excited phosphors have been widely used as lighting devices, but they have a short lifetime, infrared emission (ultraviolet emission), mercury use problems, We had problems such as luminous efficiency.

  In recent years, LEDs and electroluminescence (EL) light sources have been developed as techniques for solving these problems, and in particular, the use of LED light sources for general lighting devices has been accelerated.

  A general surface-mount type LED light source emits light strongly in the normal direction of the surface of the LED light source, and has a directivity in which the luminous intensity is attenuated in proportion to cos θ when the angle to the normal direction is θ. . This is because the structure of a general LED light source is such that the LED chip that emits primary light is covered in a planar shape with a protective layer containing a phosphor that converts primary light to secondary light. is there. For this reason, in the light bulb-type illumination device using the LED light source, the light distribution in the normal direction of the mounting substrate is strong, and the light distribution is such that almost no light is emitted from the side surface direction to the back surface direction. Therefore, when replaced with a conventional light bulb that illuminates almost uniformly from the front to the back, there is a problem that the brightness of the ceiling and walls changes significantly, resulting in a different illuminance space. In particular, some existing light bulb sockets embedded in the ceiling are arranged in an oblique direction. When a light bulb-type lighting device using an LED light source is installed on the socket, an important floor surface is provided with the lighting device. Light from the side surface direction is irradiated, and the illuminance is insufficient.

  As a technique for emitting light in the back direction with an illuminating device using an LED light source, a technique has been proposed in which a plane on which an LED is mounted is a polyhedron and is arranged with its side or back direction facing. This illuminating device is composed of a hemispherical light-transmitting cover and a light source using two LEDs arranged horizontally in the interior, and strong light is emitted from the light source in the normal direction of the surface.

Japanese Patent No. 4076329 Japanese Patent No. 4290887

  However, any of the lighting devices described above is complicated to manufacture and assemble, leading to an increase in manufacturing cost. In addition, there are various lighting fixtures, depending on the lighting fixture, there are those that irradiate strongly in the back direction of the lighting device, those that irradiate strongly in the front direction, and those that irradiate strongly in a specific oblique direction in some cases There was no illuminating device that could cope with these individual luminaires.

  The present invention has been made in view of the above points. An object of the present invention is to obtain a lighting device that can freely adjust light distribution according to a use environment and can provide a desired illuminance space.

  According to the embodiment, the lighting device includes a base member having a front flat portion, a light source provided on the front flat portion, and a transparent light that covers at least the front surface of the light source and emits light emitted from the light source to the outside. A translucent cover having a light region; and an optical control member that covers the translucent cover and controls light transmission.

FIG. 1 is a cross-sectional view illustrating a light bulb-type illumination device and an optical control member according to a first embodiment. FIG. 2 is a diagram showing a comparison of measured values of light distribution of the illumination device according to the first embodiment and the illumination device according to the comparative example. FIG. 3 is a cross-sectional view showing a light bulb-type illumination device and an optical control member according to a second embodiment. FIG. 4 is a diagram showing a comparison of measured values of the light distribution of the lighting apparatus according to the second embodiment and the lighting apparatus according to the comparative example. FIG. 5 is a cross-sectional view showing a light bulb type illumination device and an optical control member according to a third embodiment. FIG. 6 is a diagram comparing and comparing measured values of the light distribution of the lighting device according to the third embodiment and the lighting device according to the comparative example. FIG. 7 is a cross-sectional view showing a light bulb-type lighting device and an optical control member according to a fourth embodiment.

Hereinafter, a light bulb type illumination device according to various embodiments will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 shows a bulb-type lighting device 1 according to the first embodiment and an optical control member of the lighting device.

  As shown in FIG. 1, the illuminating device 1 includes a base material 2 having a front flat portion 2a, a substrate 5 disposed on the front flat portion 2a of the base material 2, and a light source comprising LEDs mounted on the substrate. 6 and the translucent cover 4, and the outer shell of the lighting device 1 is configured by the base material 2 and the translucent cover 4.

  The base material 2 is formed in, for example, a truncated cone shape, and the end on the large diameter side forms the front flat portion 2a. The substrate 2 is not limited to this, and may be formed in a columnar shape or a semicircular cross section. A base 3 is provided at the end of the substrate 2 opposite to the front flat portion 2a. A drive circuit 10 that drives the light source 6 is housed in the base material 2. The power supplied from the base 3 which is a terminal on the power supply side is supplied to the drive circuit 12, and the light source 6 is turned on by the drive circuit 10. The base material 2 also plays a role of releasing heat generated by the light source 6 and is generally composed of a metal part having a large heat capacity.

  The translucent cover 4 is formed in a substantially hemispherical shape, and an open lower end is fixed to the front flat portion 2 a of the base material 2. Thereby, the translucent cover 4 covers the front side and the side of the light source 6. The translucent cover 4 is formed of, for example, a resin material having a thickness of 1.5 mm and a transmittance of 85%, and the entire region forms a translucent region that can transmit light.

  The illuminating device 1 includes an optical control member 7 provided on the surface side facing the light source 6 of the translucent cover 4. The optical control member 7 is a molded product of a polycarbonate (PC) sheet having a thickness of 0.3 mm, a transparent cover sheet 7a formed in a substantially hemispherical shape, and a transmissive reflection layer 8 formed on the surface of the cover sheet 7a. It consists of and. The optical control member 7 is disposed so as to cover the outer surface of the translucent cover 4 and the outer periphery of the upper end portion of the substrate 2.

  The transmission / reflection layer 8 may be formed on the light source side of the cover sheet 7a, that is, on the inner surface side or the outer surface side of the cover sheet 7a, or may be formed on both sides thereof. The shape of the cover sheet 7a is formed by an existing molding method such as vacuum molding or compression molding. The cover sheet 7a can be molded either before or after the transmission / reflection layer 8 is formed. However, when the shape is complicated, the process of forming the transmission / reflection layer 8 on the cover sheet 7a after printing is simple.

  The material of the cover sheet 7a places importance on high transmittance, and is preferably PC, PMMA, PET, PS, or COC. By including scattering particles as necessary, the transmissive reflection layer 8 can improve the diffusibility of transmitted light, and can reduce unevenness in luminance and light distribution in the entire lighting device 1. The thickness of the cover sheet 7a is desirably about 0.1 to 1.0 mm that can be procured for general purposes, and can be selected as appropriate according to the elongation of molding and the ease of processing the transmission / reflection layer. In addition, a translucent sheet may be used as the transmission / reflection layer 8, but by forming the transmission / reflection layer 8 by printing as in the present embodiment, the transmission / reflection characteristics for each region can be arbitrarily controlled, It can be set as the control means which makes the luminous intensity distribution of the illuminating device 1 uniform.

According to the illuminating device 1 configured as described above, the light emitted from the light source 6 passes through the translucent cover 4 and reaches the transmission / reflection layer 8. The light reaching the transmission / reflection layer 8 is partly transmitted and partly reflected by the transmission / reflection layer 8, and diffused with the surface normal direction of the transmission / reflection layer 8 as the main axis. Therefore, the transmission / reflection layer 8 receives the light from the light source 6 and behaves as if it is a second surface light source. Further, in a pattern in which there is a reflection film opening in the transmissive reflection layer 8, the light passing through the opening passes through while maintaining the original direction. As described above, the light finally emitted to the outside can achieve a desired light distribution by appropriately controlling the transmission reflectance of the transmission / reflection layer 8.
According to the first embodiment, the transmissive reflection layer 8 minimizes the transmittance of the region facing the normal direction of the front flat portion 2a, that is, the front region facing the front surface of the light source 6, and the front flat portion. The transmittance is gradually increased as it approaches 2a. In the illuminating device 1 having the above configuration, most of the strong light emitted in the normal direction from the light source 6 is reflected by the front region where the transmittance of the transmission / reflection layer 8 is minimized, and the side region is adjusted to have a high transmittance. Therefore, the light distribution of the lighting device 1 can be widened.

  FIG. 2 shows a comparison of the light distribution of the lighting device 1 and the light distribution of the lighting device according to the comparative example. The lighting device according to the comparative example is a general lighting device in which the optical control member 7 is not installed, and the half-value angle of the light distribution is 130 degrees. On the other hand, in the illuminating device 1 which concerns on this embodiment, the half value angle of light distribution can be expanded to 165 degree | times.

  From the above, it is possible to obtain a light bulb-type lighting device that can freely adjust light distribution according to the use environment and can provide a desired illuminance space.

  Next, a light bulb type illumination device according to another embodiment will be described. Note that, in the various embodiments described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, detailed description thereof is omitted, and different portions will be mainly described.

(Second Embodiment)
FIG. 3 shows a light bulb-type lighting device 1 and an optical control member thereof according to the second embodiment.
According to the second embodiment, the transmission / reflection layer 8 of the optical control member 7 maximizes the transmittance of the region facing the normal direction of the front flat portion 2a of the base 2 and the horizontal direction of the front flat portion 2a. It is formed so that the transmittance gradually decreases as it goes to.

  In this configuration, most of the light in the normal direction from the light source 6 passes through the optical control member 7 as it is, and the light irradiated from the light source 6 in the horizontal direction is further reduced by the low transmittance region of the transmission / reflection layer 8. A relatively large amount of light is reflected and only slightly passes. Therefore, it is possible to concentrate light in the normal direction of the light source 6 as compared with the conventional illumination device in which the optical control member 7 is not installed.

  FIG. 4 shows a comparison of the light distribution of the lighting device 1 and the light distribution of the lighting device according to the comparative example. The lighting device according to the comparative example is a general lighting device in which the optical control member 7 is not installed, and the half-value angle of the light distribution is 130 degrees. On the other hand, in the lighting device 1 according to the present embodiment, the peak luminous intensity can be increased 1.3 times by controlling the half-value angle of light distribution to 90 degrees.

  By changing the pattern of the transmission / reflection layer 8 of the optical control member 7 in this manner, light distribution adjustment from the light source 6 which has been difficult until now becomes easy, and light distribution control according to the environment in which the illumination device is used is possible Can be.

(Third embodiment)
FIG. 5 shows a bulb-type lighting device 1 and an optical control member thereof according to the third embodiment.
According to the third embodiment, the transmission / reflection layer 8 of the optical control member 7 maximizes the transmittance of the region facing the one side surface direction of the front surface flat portion 2a of the base member 2 and extends in the other side surface direction. It is formed so that the transmittance of the opposing region is minimized. In the present embodiment, the normal direction of the front flat portion 2a is the central axis, and the reflection / transmission characteristics for each region of the transmission / reflection layer 8 are also changed in the rotation direction.

  FIG. 6 shows a comparison of the light distribution of the lighting device 1 and the light distribution of the lighting device according to the comparative example. The illumination device according to the comparative example is a general illumination device in which the optical control member 7 is not installed, and the light distribution has a maximum luminous intensity in the normal direction of the light source, but the illumination device 1 according to the present embodiment. Then, the angle at which the maximum luminous intensity is reached can be inclined by 30 degrees.

  According to the illuminating device 1 of the said structure, it can respond easily also to special uses, such as diagonal installation and sideways installation. The lighting device is expected to be effective when a light bulb socket embedded in the ceiling is used as it is. In the conventional lighting device in which the optical control member 7 is not installed, weak light from the side surface direction is irradiated on the floor surface, which is an inefficient use method. However, in the lighting device according to the present embodiment, it is important. The illuminance can be adjusted so that the illuminance on the floor becomes the maximum.

In addition, when installing the bulb, the cap 3 is inserted into the bulb socket and fixed by screwing, so it is not possible to determine in advance which part of the bulb side will be fixed on the floor side. Although it is difficult, by attaching the end of the optical control member 7 so as to cover the side surface side of the substrate 2 as in this embodiment, the normal direction of the light source 6 is centered with respect to the translucent cover 4. The optical control member 7 can be freely rotated as an axis. Thereby, the orientation of the maximum irradiation region can be easily adjusted after the lighting device 1 is installed.
The optical control member 7 can be easily attached to and detached from the translucent cover 4 by configuring the optical control member 7 with a sheet-like thin resin material and giving elasticity to a portion fixed to the lighting device 1. In the illuminating device 1 having such a configuration, the user can select an optimal situation in the luminaire or environment to be used by attaching / detaching or rotating the optical control member 7.

Further, in the present embodiment, the optical control member 7 is formed as a sheet that can be attached / detached and rotated by the user. However, when the attachment / detachment rotation is unnecessary, the optical control member 7 may be directly formed on the outer surface of the translucent cover. . In this case, the optical control member 7 can be formed using a pad printing method, a spray method, or the like.
From the above, it is possible to obtain a light bulb-type lighting device that can freely adjust light distribution according to the use environment and can provide a desired illuminance space.

(Fourth embodiment)
FIG. 7 shows a light bulb-type lighting device 1 and an optical control member thereof according to the fourth embodiment.
According to the fourth embodiment, the optical control member 7 is composed of a transparent cover sheet 7a containing a phosphor 9 that absorbs blue light from the light source 6 and converts it into yellow light having a long wavelength and emits it. Yes. The cover sheet 7 a is detachably attached to the outer side of the translucent cover 4, and covers the outer surface of the translucent cover and the upper outer periphery of the substrate 2.

By mounting the optical control member 7, emitted light having a color temperature of 6000K is changed to a warm color temperature of 3000K without being mounted. As a result, the user can easily adjust the color temperature without installing a plurality of types of light sources having special wavelengths. Therefore, it is possible to freely adjust the light distribution according to the use environment, and it is possible to obtain a light bulb type illumination device that can provide a desired illuminance space.
In the second to fourth embodiments described above, other configurations of the lighting device 1 are the same as those of the first embodiment described above.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Base material, 2a ... Front flat part, 3 ... Base, 4 ... Translucent cover,
5 ... Mounting board, 6 ... Light source, 7 ... Optical control member, 7a ... Cover sheet,
8 ... Transmission / reflection layer, 10 ... Drive circuit

Claims (11)

A base material having a front flat portion;
A light source provided on the front flat portion;
A translucent cover that covers at least the front surface of the light source and has a translucent region that emits light emitted from the light source to the outside;
An optical control member that covers the translucent cover and controls the transmission of light;
A lighting device comprising:   The lighting device according to claim 1, wherein the optical control member includes a transmission / reflection layer that partially reflects and partially transmits light from the light source.   The lighting device according to claim 1, wherein the optical control member includes a sheet that absorbs light from the light source and converts the light into light having a long wavelength.   The illuminating device according to claim 1, wherein the optical control member includes a transmissive reflection layer having different transmission / reflection characteristics for each region from a normal direction to a side surface direction of the front flat portion where the light source is disposed.   The lighting device according to claim 1, wherein the optical control member has the highest transmittance in a region facing a normal direction of the front flat portion.   The lighting device according to claim 1, wherein the optical control member has the highest transmittance in a region facing the side surface direction of the front flat portion.   The illumination apparatus according to claim 1, wherein the optical control member has a reflection / transmission characteristic that changes in each region in a rotation direction with a normal direction of the light source as a central axis.   The lighting device according to claim 1, wherein the optical control member includes a transparent cover sheet and a transmission / reflection layer formed on the cover sheet.   The illumination device according to any one of claims 1 to 8, wherein the optical control member is rotatably mounted on the light-transmitting cover with a normal direction of the light source as a central axis.   The lighting device according to claim 1, wherein the optical control member is detachably attached to the translucent cover.   The lighting device according to claim 1, wherein the optical control member is formed on an outer surface of the translucent cover.

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