JP2014022252A - Light-emitting device - Google Patents

Light-emitting device Download PDF

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Publication number
JP2014022252A
JP2014022252A JP2012161324A JP2012161324A JP2014022252A JP 2014022252 A JP2014022252 A JP 2014022252A JP 2012161324 A JP2012161324 A JP 2012161324A JP 2012161324 A JP2012161324 A JP 2012161324A JP 2014022252 A JP2014022252 A JP 2014022252A
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light
led
diffusing
leds
emitting
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JP5653396B2 (en
Inventor
Asumi Yoshizawa
明日美 吉澤
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Mitsubishi Electric Corp
三菱電機株式会社
三菱電機照明株式会社
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Abstract

A light-emitting device that achieves cost reduction, does not need to change the shape of a module or a board depending on the form of an appliance, and can avoid an increase in mounting area even when high luminance is required. about.
The present invention relates to a light emitting device using LEDs, and a circular LED module 110 in which one or a plurality of LEDs 111 are arranged at the center, and light emitted from each LED of the LED module 110. A diffusing plate 112 having a diffusing light diffusing member, and the light diffusing member reduces the illuminance directly below the LED module 110 and makes the illuminance distribution in the surroundings uniform.
[Selection] Figure 2

Description

  The present invention relates to a light emitting device using a light emitting diode (LED).

  In recent years, white LEDs have been widely used for illumination purposes. Here, although the amount of light of the LED itself is increasing, an appliance that requires a large amount of light generally uses a large number of LED packages to form a single module. Moreover, in the illumination using LED, front brightness is very high and glare (also called glare) becomes a problem. In order to solve this problem, a countermeasure for reducing glare has been taken in which a large number of small, low-wattage LEDs are arranged to look like a surface light source (see, for example, Patent Document 1).

Special table 2008-509517 gazette

  The problem with light emitting devices using LEDs is that the amount of heat generated increases as the amount of light increases, making it difficult to design heat dissipation. When a light source with high brightness is required, mounting LEDs for the brightness per light source There is a problem that the area becomes large.

  In view of cost, it is desirable that the number of LEDs per light emitting device is small.

  In the invention described in Patent Document 1 above, the arrangement of the LEDs is devised, and the necessary amount of light is obtained with the minimum size by mounting the LEDs as necessary at the required angles. The problem that the mounting area of the LED increases with respect to the luminance of the LED cannot be solved.

  The present invention has been made in view of the above, achieves cost reduction, does not need to change the shape of the module or the board according to the form of the instrument, and even when high luminance is required, the mounting area An object of the present invention is to obtain a light emitting device capable of avoiding an increase in the size.

  In order to solve the above-mentioned problems and achieve the object, the present invention is a light-emitting device using LEDs, a circular LED module in which one or a plurality of LEDs are arranged in the center, and the LED module A diffusion plate having a light diffusing member for diffusing light emitted from each of the LEDs, wherein the light diffusing member reduces the illuminance directly below the LED module and makes the illuminance distribution in the surroundings uniform. And

  According to the present invention, since it is possible to use an LED having a large luminous flux value, the number of LEDs per light-emitting device can be reduced, and the cost can be reduced. In addition, even when high luminance is required, an effect of avoiding an increase in the LED mounting area can be achieved.

FIG. 1 is a plan view showing a configuration example of Embodiment 1 of the light emitting device according to the present invention. FIG. 2 is a perspective view illustrating a configuration example of the light emitting device according to the first embodiment of the present invention. FIG. 3 is a plan view illustrating an example of the light emitting device. FIG. 4 is a diagram illustrating an example of a light diffusing member constituting the light emitting device of the first embodiment. FIG. 5 is a diagram illustrating an example of a light diffusing member constituting the light emitting device of the second embodiment. FIG. 6 is a diagram illustrating an example of a light diffusing member constituting the light emitting device of the third embodiment.

  Embodiments of a light emitting device according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a plan view showing a configuration example of Embodiment 1 of the light emitting device according to the present invention. FIG. 2 is a perspective view of the light emitting device shown in FIG.

  As shown in FIG. 1, the light emitting device 100 according to the present embodiment includes an LED module 110. The LED module 110 includes an LED 111. In the example shown in FIG. 1, the number of LED modules 110 is four, but the number is not limited to this. Further, the number of LEDs 111 included in one LED module 110 is not limited to the illustrated one. The number of LED modules 110 and the number of LEDs 111 included in one LED module 110 are determined in accordance with required specifications for the light emitting device 100.

  1 and 2 are those in which an LED module 110 is mounted on an appliance housing having only an illumination part, and the LED module 110 is a plurality of LEDs 111 or a large amount of LED 111 mounted on a single lamp. is there. When the light flux value of the light emitting device 100 needs to satisfy about 4000 [lm], for example, when the light flux value of one LED 111 is 100 [lm], the light emitting device 100 requires 40 LEDs 111. When two LED modules 110 are provided on one side of the light emitting device 100 as shown in FIG. 1, a total of four LED modules 110 are each equipped with 10 LEDs 111. When the luminous flux value of one LED 111 is 2000 [lm], as shown in FIG. 3, one LED module 110 on which one LED 111 is mounted is provided on one side of the light emitting device 100. (When light loss such as diffuser is not considered) The shape of the substrate is a circle similar to a downlight.

  Features of the light-emitting device of this embodiment will be described. As shown in FIG. 4, the light emitting device of the present embodiment includes a diffusion plate 112 in which a light diffusion member 120 is arranged in a portion directly above the light source portion (hatched portion) of the LED 111. The light diffusing member 120 reduces the glare immediately below by diffusing the light immediately below the light source and spreading it around. By arranging the light emitting devices in a grid shape, the illuminance distribution in the room can be kept uniform.

  In a device that uses a large amount of light source to reduce the number of LED lamps, the luminous flux per LED is large and the area directly underneath is very dazzling. For this reason, a large light source is generally suitable for a high ceiling or the like, but there is also an advantage that it can be made inexpensively because the number of lamps is small. Since the light emitting device of the present embodiment includes the diffusion plate 112 and diffuses the light emitted from the LED 111, the glare immediately below the LED 111 can be reduced. That is, the luminous flux per LED 111 can be increased to reduce the total number of LEDs 111, thereby reducing the cost.

  1 and 2, two circular light sources are mounted on one side of the grid lighting fixture, but one circular light source may be configured as one as shown in FIG. 3.

  As described above, the configuration of FIGS. 1 to 3 is characterized in that the diffusion plate 112 has the light diffusion member 120 as shown in FIG. 4 so as to spread the light of the circular module. In FIG. 4, the description of the diffusion plate 112 is omitted.

  The light diffusing member 120 shown in FIG. 4 is shaped like a hemispherical cap, and has fan-shaped grooves at regular intervals. The color shall be translucent or white.

  Light directly passing through the fan-shaped groove of the light diffusing member 120 and light emitted repeatedly from the groove portion on the inner side diffuse the light from the light source part, so that the illuminance directly below is reduced so that the illuminance distribution in the room becomes uniform. .

  When the LED module 110 on which a large number of LEDs 111 having a small luminous flux value are mounted is used as a light source, the diffusion plate 112 has one light diffusing member 120 for the LED module 110 and a small number of LEDs 111 having a large luminous flux value (1 In the case where the mounted LED module 110 is used as a light source, one light diffusion member 120 is provided for one LED 111.

  1 and 2 show application examples to grid lighting equipment (grid light), but application to other lighting equipment such as downlights is also possible.

  Thus, the light-emitting device of the present embodiment includes a light diffusing member that covers the LED module or the light source part of the LED included in the LED, diffuses the light emitted from the LED, and reduces the illuminance directly below the light-emitting device. It is possible to use an LED with a large luminous flux value. That is, the number of LEDs can be reduced, and cost reduction can be realized. Moreover, it can prevent that the mounting area of LED becomes large.

Embodiment 2. FIG.
The light diffusing member 120 (see FIGS. 1 to 4) of the diffusing plate 112 provided in the light emitting device of Embodiment 1 may be used as the light diffusing member 121 shown in FIG.

  FIG. 5 is a diagram illustrating a configuration of the light diffusing member 121 provided in the light emitting device of the second embodiment. FIG. 5A is a front view, and FIG. 5B is a perspective view. FIG. 5C shows the positional relationship between the LED 111 and the light diffusion member 121. The configuration other than the light diffusion member 121 is the same as that of the first embodiment. Note that the hatched portion is a light source portion of the LED 111.

  As shown in FIG. 5C, the light emitting device of the present embodiment includes a diffusion plate 112 in which a light diffusion member 121 is disposed in a portion directly above the light source unit of the LED 111. For convenience of explanation, the description of the diffusion plate 112 is omitted. The light diffusing member 121 diffuses the light directly under the light source and spreads it to the surroundings, thereby reducing glare immediately below. By arranging the light emitting devices in a grid shape, the illuminance distribution in the room can be kept uniform.

  The light diffusing member 121 shown in FIG. 5 has a dome-like structure in which the center of the hemisphere is recessed, and is translucent. This has the effect of spreading the light around and makes the illuminance distribution in the room uniform.

  Similarly to the light diffusing member 120 of the first embodiment, when the LED module 110 on which a large number of LEDs 111 having a small luminous flux value are mounted is used as the light source, the diffusing plate 112 has one light diffusing member 121 relative to the LED module 110. When the LED module 110 having a small number (one or two) of LEDs 111 having a large luminous flux value is used as the light source, one light diffusion member 121 is provided for each LED 111.

  Thus, even when the light diffusing member 120 provided in the light emitting device of the first embodiment is replaced with the light diffusing member 121, the same effect as that of the first embodiment can be obtained.

Embodiment 3 FIG.
The light diffusing member 120 (see FIGS. 1 to 4) of the diffusing plate 112 provided in the light emitting device of Embodiment 1 may be used as the light diffusing member 122 shown in FIG.

  FIG. 6 is a diagram illustrating a configuration of the light diffusing member 122 included in the light emitting device of the third embodiment. 6A is a front view, and FIG. 6B is a perspective view. The configuration other than the light diffusion member 122 is the same as that of the first embodiment. Note that the hatched portion is a light source portion of the LED 111.

  The light emitting device according to the present embodiment includes a diffusion plate 112 in which a light diffusion member 122 is disposed in a portion directly above the light source unit of the LED 111. For convenience of explanation, the description of the diffusion plate 112 is omitted. The light diffusing member 122 diffuses the light directly under the light source and spreads it to the surroundings, thereby reducing glare immediately below. By arranging the light emitting devices in a grid shape, the illuminance distribution in the room can be kept uniform.

  According to the present embodiment, the light diffusion member 122 of FIG. 6 has a smaller area on the light source side than the light opening side, and the front view is a trapezoidal flat plate. It is translucent and diffuses light when light reflected on the light-opening side exits from the slope.

  Similarly to the light diffusing member 120 of the first embodiment, when the LED module 110 on which a large number of LEDs 111 having small light flux values are mounted is used as the light source, the diffusing plate 112 has one light diffusing member 122 relative to the LED module 110. When the LED module 110 having a small number (one or two) of LEDs 111 having a large luminous flux value is used as the light source, one light diffusing member 122 is provided for each LED 111.

  Thus, even when the light diffusing member 120 included in the light emitting device of the first embodiment is replaced with the light diffusing member 122, the same effect as that of the first embodiment can be obtained.

  As described above, the light emitting device according to the present invention is useful as a lighting device (downlight, grid light, etc.) using LEDs.

  100 light emitting device, 110 LED module, 111 LED, 112 diffuser plate, 120, 121, 122 light diffusing member.

Claims (4)

  1. A light emitting device using LEDs,
    A circular LED module having one or more LEDs arranged in the center;
    A diffusion plate having a light diffusion member that diffuses light emitted from each LED of the LED module;
    With
    The light diffusing member reduces the illuminance directly below the LED module and makes the illuminance distribution in the surroundings uniform.
  2.   The light diffusing member is individually provided for each of the LEDs or each of the LED modules, and each light diffusing member has one hemispherical fan-shaped groove at regular intervals and is translucent or white. The light emitting device according to claim 1, wherein the light emitting device is provided.
  3.   The light diffusing member is individually provided for each of the LEDs or each of the LED modules, and each light diffusing member has a dome-like structure in which the center of one hemisphere is recessed and is translucent. The light-emitting device according to claim 1.
  4.   The light diffusing member is formed using a translucent flat plate, and an area of an incident surface of light emitted from the LED is smaller than an area of the other surface and is perpendicular to the incident surface and the other surface. The light-emitting device according to claim 1, wherein the shape of the cut surface when cut is a trapezoid.
JP2012161324A 2012-07-20 2012-07-20 Light emitting device Expired - Fee Related JP5653396B2 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000307152A (en) * 1999-02-15 2000-11-02 Yukihiro Mukoda Light source device for display
JP2001118402A (en) * 1999-10-15 2001-04-27 Matsushita Electronics Industry Corp Signal lamp
JP2010205553A (en) * 2009-03-03 2010-09-16 Sharp Corp Lighting device
JP3173328U (en) * 2011-11-17 2012-02-02 株式会社昭電 Light bulb type LED lamp
JP2012084695A (en) * 2010-10-12 2012-04-26 Panasonic Corp Lamp
WO2012096204A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000307152A (en) * 1999-02-15 2000-11-02 Yukihiro Mukoda Light source device for display
JP2001118402A (en) * 1999-10-15 2001-04-27 Matsushita Electronics Industry Corp Signal lamp
JP2010205553A (en) * 2009-03-03 2010-09-16 Sharp Corp Lighting device
JP2012084695A (en) * 2010-10-12 2012-04-26 Panasonic Corp Lamp
WO2012096204A1 (en) * 2011-01-12 2012-07-19 シャープ株式会社 Illumination device and display device
JP3173328U (en) * 2011-11-17 2012-02-02 株式会社昭電 Light bulb type LED lamp

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