JP6526131B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Since the LED has the characteristic of high directivity of light, some contrivance is required to obtain a light distribution close to that of the incandescent lamp and the fluorescent lamp in the LED bulb. One method is to provide a regular polyhedron formed of a substrate provided with a large number of LEDs in the cover of the LED bulb (see Patent Document 1). As another method, there is a method of providing a flexible circuit board bendable in a cage shape in a cover (see Patent Document 2).

Japanese Patent Publication No. 2002-525814 Japanese Patent Application Publication No. 2003-59305 JP, 2010-129501, A Japanese Utility Model Publication No. 60-112010 Japanese Utility Model Publication No. 57-16161 JP, 2010-198808, A JP, 2009-295299, A Unexamined-Japanese-Patent No. 2004-185997 JP, 2010-129300, A International Publication No. 2010/084546 JP, 2010-103028, A

  In the methods of Patent Documents 1 and 2, it is attempted to obtain a light distribution close to that of an incandescent lamp or a fluorescent lamp by arranging a plurality of LEDs in different directions. However, in such a method, there is 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 through the base, but in order to dissipate the heat of a large number of LED substrates provided in the LED bulb, such heat radiation Measures are insufficient, and from the influence of heat, defects such as light flux reduction and life shortening of the LED can be considered. In order to avoid these problems, there is also a method of suppressing the temperature rise by lowering the output of the LED, but it becomes impossible to obtain a high luminous flux.

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

  In the method of Patent Document 2, a flexible circuit board on which a plurality of LEDs are arranged is bent in a cage shape and sealed in a cover. Patent Document 2 only mentions the extent to which the circuit is molded with silicon rubber or the like having good thermal conductivity as a method of heat radiation, which is insufficient as a heat radiation means, and the heat flux lowers the luminous flux of the LED and shortens its life And other problems. As described above, in order to avoid these problems, there is also a method of suppressing the temperature rise by lowering the output of the LED, but it becomes impossible to obtain a high luminous flux.

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

  An object of the present invention is to provide a lighting device that uses LEDs as light sources and that is easy to manufacture.

A lighting device according to one aspect of the present invention is
LED module with LED mounted on the board,
A housing in which the other end is thicker than one end, a base is attached to the one end, and the LED module is attached to the other end;
And a cover for covering the LED module in a state of being attached to the housing and transmitting light emitted from the LED.
The cover includes a lower cover and an upper cover which is separate from the lower cover and disposed at a position farther from the housing than the lower cover.
The cover upper portion has a region to which light is directly emitted from the LED according to the light distribution characteristic of the LED, and at least a part of the region diffuses and transmits light from the LED to control light distribution.

  According to one aspect of the present invention, by devising the structure of the cover, it is possible to provide a lighting device using an LED as a light source, which is easy to manufacture.

The (a) perspective view of the LED bulb which concerns on Embodiment 1, (b) Front view. (A) exploded perspective view of the LED bulb according to the first embodiment, (b) an exploded sectional view. FIG. 2 is a cross-sectional view of the LED bulb according to the first embodiment. The (a) perspective view of the LED bulb which concerns on Embodiment 2, (b) Front view. The (a) disassembled perspective view of the LED bulb which concerns on Embodiment 2, (b) exploded sectional view. Sectional drawing of the LED light bulb which concerns on Embodiment 2. FIG.

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

Embodiment 1
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 cross-sectional view of the LED bulb 10 (hatching is omitted).

  The LED bulb 10 has a cover 11 and a radiating fin 12a on the outer surface (peripheral surface), a substantially conical casing 12 (base portion) having a narrow end and a wide end, and one end of the casing 12 And a flat LED module 14 (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 is composed of two members, a cover upper portion 11a having different light distribution characteristics and a cover lower portion 11b (at least a portion of which is an example of a first light transmitting portion). The shape of the cover upper portion 11a is, for example, a dome shape. The shape of the cover lower portion 11b is, for example, a bowl shape. The cover upper portion 11a and the cover lower portion 11b are bonded, for example, with an adhesive. In addition, the cover upper part 11a and the cover lower part 11b may be integrally formed. Alternatively, as in the second embodiment described later, the cover upper portion 21a and the cover lower portion 21b may be formed detachably from each other.

  The cover upper portion 11a includes a cover upper transmitting portion 11c (example of a second light transmitting portion) transmitting light emitted by the LED module 14 and a cover upper diffusion transmitting portion 11d (diffuse transmitting portion transmitting and transmitting light emitted by the LED module 14). Examples of The cover upper transmission portion 11c is disposed substantially at the center of the cover upper portion 11a, and the cover upper diffusion transmission portion 11d is disposed around the cover upper transmission portion 11c. The cover upper diffusion transmission part 11d has, for example, a prism shape. The light is refracted toward the lower cover portion 11b by this prism.

  The housing 12 has a screw portion 12 b screwed to the outer surface by die processing or tap processing so that the cover 11 (cover lower portion 11 b) can be attached and detached at one end side. Although not shown, the housing 12 may have a hooking piece such as a lock lever that slides so as to be able to project to one end. In this case, the cover 11 is provided with a groove corresponding to the hooking piece. The hooking piece is inserted into the groove of the cover 11 when the hooking piece protrudes to one end side of the housing 12 to prevent the cover 11 from rotating. That is, in a state where the cover 11 is attached to the housing 12, when the hooking piece is hooked in the groove, 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 disengaged from the groove of the cover 11, and the cover 11 is put in a rotatable state (released state). In addition, the position of the hooking piece and the groove may be reversed. That is, the housing 12 may have a groove and the cover 11 may have a hooking piece.

  Although not shown, the LED light bulb 10 includes a lighting circuit which is housed inside the housing 12 and 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 of the housing 12. The LED module 14 includes a plurality of LEDs 14a (examples of light sources) for emitting 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 ring at substantially equal intervals on a circular substrate 14b. Thus, the luminous intensity in the central axis direction can be reduced and discomfort glare can be suppressed by arranging the plurality of LEDs 14a at positions spaced a predetermined distance from the center without arranging the LEDs 14a at the center. The plurality of LEDs 14a may be replaced with one or more ELs or other light sources.

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

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

  As described above, in the present embodiment, the cover upper diffusion transmitting portion 11d is located at least a part of the area where the light is emitted from the plurality of LEDs 14a, and the light emitted from the plurality of LEDs 14a is reflected 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 diffusion transmitting portion 11d, and transmits light reflected by the cover upper diffusion transmitting portion 11d to the outside. . Therefore, part of highly directional light emitted upward from the plurality of LEDs 14a can be emitted downward, and a light distribution characteristic close to that of an incandescent lamp or a bulb-type fluorescent lamp can be obtained. In addition, the whole cover lower part 11b does not need to be located in the direction in which light is not irradiated from several LED14a, and the direction in which light is reflected by the cover upper diffuse transmission part 11d. If at least a portion (in particular, the lower portion) of the lower cover portion 11b is positioned in the direction in which light is not emitted from the plurality of LEDs 14a and in the direction in which light is reflected by the upper cover diffusion transmitting portion 11d, Light distribution characteristic close to that of the conventional fluorescent lamp is obtained. The cover lower portion 11b may not only transmit the light reflected by the cover upper diffuse transmission portion 11d to the outside, but 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.

  Further, in the present embodiment, the cover upper transmission portion 11c is located in a direction in which light is emitted from the plurality of LEDs 14a and in a certain area surrounded by the cover upper diffusion transmission portion 11d, and is emitted from the plurality of LEDs 14a. Transmits light to the outside. The cover upper transmission part 11c has a lower light diffusion rate than the cover upper diffusion transmission part 11d, and desirably transmits almost all the light to the outside. Therefore, it is possible to prevent the luminous flux in the direction of the optical axis (central axis) 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 by the cover upper portion 11a, so that the light distribution can be made close to that of the conventional incandescent bulb or bulb-type fluorescent lamp it can. That is, by providing the light distribution control function to the cover 11, the irradiation angle of the light emitted from the LED module 14 arranged horizontally to the housing 12 is broadened to obtain a light distribution close to the incandescent bulb and the bulb-type fluorescent lamp Can.

  Further, in the present embodiment, by controlling the light distribution by the cover 11, the structure can be simplified, the manufacture can be facilitated, and the costs for the manufacture can be suppressed low. Then, by making the cover 11 having the light distribution control function detachable, it is possible to realize various light distribution by replacing the cover 11 according to the light distribution desired by the user.

  Further, in the present embodiment, by providing the entire outer surface of the housing 12 with heat dissipation performance, it is possible to prevent defects such as light flux reduction and life shortening of the LED 14a that occur due to insufficient heat dissipation performance.

Second Embodiment
The difference between this embodiment and 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. 5 (a) is an exploded perspective view of the LED bulb 10, and FIG. 5 (b) is an exploded cross-sectional view of the LED bulb 10 (hatching is omitted).

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

  The cover 21 is composed of two members, a cover upper portion 21a having different light distribution characteristics and a cover lower portion 21b (at least a portion of which is an example of a first light transmitting portion). The cover upper portion 21a is provided with a hook-like protrusion 21c, and the cover lower portion 21b is provided with a groove 21d. By fitting the projection 21c into the groove 21d, the cover upper portion 21a is attached to the cover lower portion 21b. As described above, in the present embodiment, the cover upper portion 21a and the cover lower portion 21b are formed detachably from each other, so either one or both of the cover upper portion 21a and the cover lower portion 21b can be replaced to change the light distribution characteristics of the entire LED bulb 10 arbitrarily. It can be changed. As in the first embodiment, the cover upper portion 21a and the cover lower portion 21b may not be detachable, and may be bonded, for example, with an adhesive. Alternatively, the upper cover 21a and the lower cover 21b may be integrally formed.

  The cover upper portion 21a has a cover upper diffuse transmission portion 21e (an example of a diffuse transmission portion) that diffuses and transmits light emitted by the LED module 14. In the cover upper diffuse transmission part 21e, the transmittance for transmitting the light emitted by the LED module 14 gradually becomes higher toward the central part, and the diffusion coefficient for diffusing the light emitted from the LED module 14 is higher for the peripheral frame part. It is formed to be The cover upper diffuse transmission part 21e has, for example, a prism shape. The light is refracted toward the lower cover portion 21b by this prism.

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

  The light emitted from the LED module 14 is irradiated in the direction of the cover upper portion 21 a due to the light distribution characteristic of the LED 14 a. The light emitted from the LED 14a is divided into light transmitted through the cover upper diffusion transmission part 21e and light diffused toward the cover lower part 21b by refraction at the prism of the cover upper diffusion transmission part 21e. The amount of light transmitted through the cover upper diffusion transmission part 21e increases as the position closer to the central part of the cover upper diffusion transmission part 21e. Then, the amount of light diffused toward the cover lower portion 21b increases as the position approaches the peripheral edge portion of the cover upper diffusion transmitting portion 21e.

  As described above, in the present embodiment, in the cover upper diffusive transmission part 21e, the light diffusivity becomes higher as it goes from the central part to the peripheral part, and the light transmittance becomes higher as it goes from the peripheral part to the central part. Therefore, the uniformity of the light emitted from the LED bulb 10 (in particular, the upper part) is improved more than in the first embodiment.

  As mentioned above, although embodiment of this invention was described, you may combine and implement two or more embodiment among these. Alternatively, one of the embodiments may be partially implemented. Alternatively, among these, two or more of the embodiments may be partially combined and implemented.

  DESCRIPTION OF SYMBOLS 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 housings, 12a heat radiation fin, 12b screw part, 13 base , 14 LED module, 14a LED, 14b substrate, 21c protrusion, 21d groove.

Claims (2)

LED module with LED mounted on the board,
A housing having an outer peripheral surface whose other end is thicker than one end, a base attached to one end of the outer peripheral surface, and the LED module attached to the other end of the outer peripheral surface;
A cover that covers the LED module in a state of being attached to the other end side of the housing and transmits light emitted from the LED;
The cover includes a lower cover and an upper cover which is separate from the lower cover and disposed at a position farther from the housing than the lower cover.
There is no obstruction blocking the light between the LED and the top of the cover,
The cover upper portion has a region to which light is directly emitted from the LED according to the light distribution characteristic of the LED, and at least a part of the region reflects and transmits light directly emitted from the LED ,
The lower part of the cover is an illumination device which transmits light reflected by the upper part of the cover to the lower side of the cover . The upper part of the cover has a dome shape,
The lighting device according to claim 1, wherein the cover upper portion has a region where the light from the LED is directly irradiated to the dome-shaped portion.

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