JP5877548B2 - Light source device and illumination device - Google Patents

Description

  The present invention relates to a light source device and an illumination device.

  Since the LED has a characteristic that the directivity of light is high, in order to obtain a light distribution close to that of an incandescent bulb or a fluorescent lamp in an LED bulb, some device is required. As one method, there is a method in which a regular polyhedron composed of a substrate on which a large number of LEDs are provided is provided in the cover of the LED bulb (see Patent Document 1). As another method, there is a method in which a flexible circuit board that can be bent into a cage shape is provided in a cover (see Patent Document 2).

JP-T-2002-525814 JP 2003-59305 A JP 2010-129501 A Japanese Utility Model Publication No. 60-112010 Japanese Utility Model Publication No. 57-16161 JP 2010-198808 A

  In the methods of Patent Documents 1 and 2, a plurality of LEDs are arranged so as to face different directions, so that light distribution close to incandescent bulbs and fluorescent lamps is obtained. However, such a method has a problem that the structure becomes complicated as described later, and it is difficult to manufacture, or at least the cost for manufacturing increases.

  In the method of Patent Document 1, the heat of the LED substrate is dissipated to the main power supply via the base. However, in order to dissipate the heat of many LED substrates provided in the LED bulb, such heat dissipation is performed. Means are insufficient, and due to the influence of heat, problems such as a decrease in the luminous flux of the LED and a shortening of the lifetime can be considered. In order to avoid these problems, there is a method of suppressing the temperature rise by reducing the output of the LED, but a high luminous flux cannot be obtained.

  Further, the LED light bulb disclosed in Patent Document 1 has a structure in which an LED substrate is connected to a base via a cylindrical gear column inside the LED bulb, and an electronic circuit for controlling the LED is accommodated in the gear column. Adopting such a complicated structure leads to a wasteful increase in manufacturing cost.

  In the method of Patent Document 2, a structure in which a flexible circuit board on which a plurality of LEDs are arranged is bent into a cage shape is enclosed in a cover. Patent Document 2 only mentions the degree of heat dissipation by molding the circuit with silicon rubber or the like having good thermal conductivity, and is insufficient as a heat dissipation means. Such problems are considered. As described above, in order to avoid these problems, there is a method of suppressing the temperature rise by reducing the output of the LED, but a high luminous flux cannot be obtained.

  Further, the LED light bulb of Patent Document 2 has a complicated structure in which a flexible circuit board bent into a cage shape is enclosed in a cover. As described above, adopting such a complicated structure leads to a wasteful increase in manufacturing cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light source device that uses an LED as a light source, and that can be easily manufactured, and can provide light distribution characteristics close to those of an incandescent lamp or a fluorescent lamp .

A light source device according to an aspect of the present invention includes:
A light source module having a light source LED der Ru, and a substrate which the light source is mounted,
A housing to which the light source module is attached;
It is composed of an upper part and a lower part having different light distribution characteristics, and is attached to the housing so as to cover the light source module, and includes a cover that reflects or refracts light emitted from the light source.
The upper part of the cover is farther from the housing than the lower part of the cover,
On the upper part of the cover is formed a prism-shaped diffusion transmission part that transmits the light emitted from the light source to the outside of the cover while diffusing,
A light-transmitting portion that transmits light reflected or refracted inside the cover to the outside of the cover is formed at a lower portion of the cover.

According to one aspect of the present invention, a light source device that uses LEDs as a light source by devising a cover structure, not a light source mounting method, is easy to manufacture but is close to an incandescent lamp or a fluorescent lamp. It is possible to provide a light source device capable of obtaining light distribution characteristics.

The (a) perspective view of the LED light bulb which concerns on Embodiment 1, (b) Front view. The (a) disassembled perspective view of the LED bulb which concerns on Embodiment 1 and (b) exploded sectional drawing. Sectional drawing of the LED bulb which concerns on Embodiment 1. FIG. The (a) perspective view of the LED light bulb which concerns on Embodiment 2, (b) Front view. The (a) disassembled perspective view and (b) disassembled sectional view of the LED bulb which concern on Embodiment 2. FIG. Sectional drawing of the LED bulb which concerns on Embodiment 2. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1A is a perspective view of an LED bulb 10 (an example of a bulb-type lighting device) according to the present embodiment, and FIG. 1B is a front view of the LED bulb 10. 2A is an exploded perspective view of the LED bulb 10, and FIG. 2B is an exploded sectional view of the LED bulb 10 (hatching is omitted).

  The LED bulb 10 has a cover 11, a heat dissipating fin 12 a on the outer surface (outer peripheral surface), a substantially conical housing 12 (base portion) having a narrow end and a wide end, and one end of the housing 12. And a flat LED module 14 (an example of a light source module) attached to the other end of the housing 12.

  The cover 11 is detachably attached to the housing 12 so as to cover the LED module 14. The cover 11 includes two members, a cover upper part 11a and a cover lower part 11b (an example of at least a part of the first light transmitting part) having different light distribution characteristics. The shape of the cover upper portion 11a is, for example, a dome shape. The shape of the cover lower part 11b is, for example, a bowl shape. The cover upper portion 11a and the cover lower portion 11b are bonded with, for example, an adhesive. Note that the cover upper portion 11a and the cover lower portion 11b may be integrally formed. Or similarly to Embodiment 2 mentioned later, the cover upper part 21a and the cover lower part 21b may be formed mutually detachably.

  The cover upper portion 11a includes a cover upper transmission portion 11c that transmits light emitted from the LED module 14 (an example of a second light transmission portion), and a cover upper diffusion transmission portion 11d that diffuses and transmits light emitted from the LED module 14 (a diffusion transmission portion). Example). The cover upper transmission part 11c is disposed substantially at the center of the cover upper part 11a, and the cover upper diffusion transmission part 11d is disposed around the cover upper transmission part 11c. The cover upper diffuse transmission portion 11d has, for example, a prism shape. By this prism, light is refracted to the cover lower part 11b side.

  The housing 12 has a threaded portion 12b threaded by die processing or tapping on the outer surface so that the cover 11 (cover lower portion 11b) is detachable on one end side. Although not shown, the housing 12 may have a hooking piece such as a lock lever that slides so as to protrude to one end side. In this case, the cover 11 is provided with a groove corresponding to the hook piece. When the hooking piece projects to one end side of the housing 12, it is inserted into the groove of the cover 11 to prevent the cover 11 from rotating. That is, when the hook 11 is hooked in the groove while the cover 11 is attached to the housing 12, the cover 11 is locked. Further, when the hooking piece does not protrude to one end side of the housing 12, the hooking piece is detached from the groove of the cover 11 to make the cover 11 rotatable (release state). The positions of the hook piece and the groove may be reversed. That is, the housing 12 may have a groove, and the cover 11 may have a hook piece.

  Although not shown, the LED bulb 10 is housed inside the housing 12 and includes a lighting circuit that lights the LED 14a. The base 13 is electrically connected to the lighting circuit and attached to the lamp socket.

  The LED module 14 is attached to one end side of the housing 12. The LED module 14 includes a plurality of LEDs 14a (an example of a light source) that irradiates light, and a substrate 14b on which the plurality of LEDs 14a are surface-mounted. The LED module 14 can be configured, for example, by arranging four LEDs 14a in a circular shape at substantially equal intervals on a circular substrate 14b. In this way, by disposing the plurality of LEDs 14a at positions spaced apart from the center without disposing the LEDs 14a at the center, the luminous intensity in the central axis direction can be reduced and unpleasant glare can be suppressed. The plurality of LEDs 14a may be replaced with one or a plurality of ELs or other light sources.

  FIG. 3 is a cross-sectional view of the LED bulb 10 (hatching is omitted), and shows an image of light distribution control and the shape of the prism when the cover upper diffusing and transmitting portion 11d is a prism.

  The light emitted from the LED module 14 is irradiated in the direction of the cover upper part 11a due to the light distribution characteristic of the LED 14a. The light emitted from the LED 14a is transmitted through the cover upper transmission part 11c, and is refracted by the prism at the cover upper diffusion transmission part 11d. By this refraction, the light transmitted through the cover upper diffusion transmission part 11d and the cover lower part 11b It is divided into light diffused to the side.

  As described above, in the present embodiment, the cover upper diffusion transmission portion 11d is located in at least a part of the region irradiated with light from the plurality of LEDs 14a, and reflects the light irradiated from the plurality of LEDs 14a to the inside. It diffuses and transmits the light to the outside. The cover lower portion 11b is positioned in a direction in which light is not emitted from the plurality of LEDs 14a and in a direction in which light is reflected by the cover upper diffuse transmission portion 11d, and transmits light reflected by the cover upper diffusion transmission portion 11d to the outside. . Therefore, it becomes possible to emit a part of highly directional light emitted upward from the plurality of LEDs 14a downward, and a light distribution characteristic close to that of an incandescent bulb or a light bulb type fluorescent lamp can be obtained. Note that the entire cover lower portion 11b may not be located in a direction in which light is not irradiated from the plurality of LEDs 14a and in a direction in which light is reflected by the cover upper diffusion / transmission portion 11d. If at least a part (particularly the lower part) of the cover lower part 11b is located in a direction in which light is not irradiated from the plurality of LEDs 14a and in a direction in which light is reflected by the cover upper diffuser 11d, an incandescent light bulb or a light bulb A light distribution characteristic similar to that of a fluorescent lamp is obtained. Further, the cover lower part 11b may not only transmit the light reflected by the cover upper diffusion / transmission part 11d to the outside, but may also reflect and diffuse the light to the inside. In this case, it is considered that the uniformity of the light emitted from the LED bulb 10 is improved.

  In the present embodiment, the cover upper transmission portion 11c is located in a certain region surrounded by the cover upper diffusion transmission portion 11d in the direction in which light is emitted from the plurality of LEDs 14a, and is emitted from the plurality of LEDs 14a. Transmits light to the outside. The cover upper transmission part 11c has a light diffusion rate lower than that of the cover upper diffusion transmission part 11d, and preferably transmits almost all light outward. Therefore, it is possible to prevent the luminous flux in the optical axis (center axis) direction of the LED bulb 10 from being reduced more than necessary.

  As described above, in the present embodiment, the light emitted from the LED module 14 is transmitted and diffused and transmitted by the cover upper portion 11a, so that the light distribution is close to that of a conventional incandescent bulb or light bulb type fluorescent lamp. it can. That is, by providing the cover 11 with a light distribution control function, the irradiation angle of light emitted from the LED module 14 disposed horizontally with respect to the housing 12 is widened, and light distribution close to an incandescent bulb or a bulb-type fluorescent lamp is obtained. Can do.

  Moreover, in this Embodiment, by controlling light distribution by the cover 11, a structure can be made simple, manufacture can be made easy, and various costs concerning manufacture can also be suppressed low. Then, by making the cover 11 having a light distribution control function detachable, various light distributions can be realized by replacing the cover 11 according to the light distribution desired by the user.

  Moreover, in this Embodiment, the heat radiation performance is given to the whole outer surface of the housing | casing 12, and it can prevent malfunctions, such as the light beam fall of the LED14a which arises from insufficient heat dissipation performance, and lifetime shortening.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 4A is a perspective view of the LED bulb 10 according to the present embodiment, and FIG. 4B is a front view of the LED bulb 10. 5A is an exploded perspective view of the LED bulb 10, and FIG. 5B is an exploded sectional view of the LED bulb 10 (hatching is omitted).

  The LED bulb 10 includes a cover 21, a casing 12, a base 13, and an LED module 14 similar to those in the first embodiment. In Embodiment 1, since the cover 11 of the LED bulb 10 is detachable, the LED bulb 10 according to the present embodiment can be configured by replacing only the cover 11.

  The cover 21 includes two members, a cover upper part 21a and a cover lower part 21b (an example of at least a part of the first light transmitting part) having different light distribution characteristics. A claw-like protrusion 21c is provided on the cover upper portion 21a, and a groove 21d is provided on the cover lower portion 21b. By fitting the protrusion 21c into the groove 21d, the cover upper part 21a is attached to the cover lower part 21b. As described above, in the present embodiment, the cover upper portion 21a and the cover lower portion 21b are formed so as to be detachable from each other. Can be changed. As in the first embodiment, the cover upper portion 21a and the cover lower portion 21b are not detachable, and may be bonded with, for example, an adhesive. Alternatively, the cover upper portion 21a and the cover lower portion 21b may be integrally formed.

  The cover upper part 21a has a cover upper diffusion / transmission part 21e (an example of a diffusion transmission part) that diffuses and transmits light emitted from the LED module 14. The cover upper diffuse transmission part 21e gradually increases the transmittance for transmitting the light emitted by the LED module 14 as it goes to the center, and the diffusion rate for diffusing the light emitted by the LED module 14 increases as it goes to the peripheral frame part. It is formed to become. The cover upper diffusion / transmission part 21e has, for example, a prism shape. This prism refracts light toward the cover lower part 21b.

  FIG. 6 is a cross-sectional view of the LED bulb 10 (hatching is omitted).

  The light emitted from the LED module 14 is irradiated in the direction of the cover upper part 21a due to the light distribution characteristic of the LED 14a. The light emitted from the LED 14a is divided into light that is transmitted through the cover upper diffusion / transmission portion 21e and light that is diffused toward the cover lower portion 21b due to refraction by the prism of the cover upper diffusion transmission portion 21e. The closer to the center part of the cover upper diffuse transmission part 21e, the more light passes through the cover upper diffuse transmission part 21e. And the amount of the light diffused to the cover lower part 21b side increases as the position is closer to the peripheral part of the cover upper diffusion / transmission part 21e.

  As described above, in the present embodiment, in the cover upper diffusion / transmission part 21e, the light diffusivity increases from the central part to the peripheral part, and the light transmittance increases from the peripheral part to the central part. Therefore, the uniformity of the light emitted from the LED bulb 10 (particularly the upper part) is improved as compared with the first embodiment.

  As mentioned above, although embodiment of this invention was described, you may implement combining 2 or more embodiment among these. Alternatively, one of these embodiments may be partially implemented. Or you may implement combining two or more embodiment among these partially.

  10 LED bulb, 11, 21 cover, 11a, 21a cover upper part, 11b, 21b cover lower part, 11c cover upper transmission part, 11d, 21e cover upper diffusion transmission part, 12 housing, 12a heat radiation fin, 12b screw part, 13 base , 14 LED module, 14a LED, 14b substrate, 21c protrusion, 21d groove.

Claims (6)

A light source module having a light source LED der Ru, and a substrate which the light source is mounted,
A housing to which the light source module is attached;
It is composed of an upper part and a lower part having different light distribution characteristics, and is attached to the housing so as to cover the light source module, and includes a cover that reflects or refracts light emitted from the light source.
The upper part of the cover is farther from the housing than the lower part of the cover,
On the upper part of the cover is formed a prism-shaped diffusion transmission part that transmits the light emitted from the light source to the outside of the cover while diffusing,
The light source device according to claim 1, wherein a light transmissive portion that transmits light reflected or refracted inside the cover to the outside of the cover is formed at a lower portion of the cover.   The light source according to claim 1, wherein the cover reflects or refracts a part of light emitted from the light source in a direction in which the diffuse transmission part is present to reach the light transmission part. apparatus. The diffuse transmission part is located in the optical axis direction of the light source with respect to the light source,
3. The light source device according to claim 1, wherein the translucent portion is located in a direction perpendicular to an optical axis direction of the light source with respect to the light source. The light transmitting portion is one of a light source device of claims 1 to 3, characterized in that diffuse light reflected or refracted by the inside of the cover. The diffuse transmission unit of claims 1 to 4, towards the area close to the position corresponding to the center of the substrate than the region far from the position corresponding to the center of the substrate, wherein the light transmittance is high Either light source device. A light source device according to any one of claims 1 to 5 ;
An illumination device comprising: a lighting circuit that is housed in the housing and that turns on the light source.

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