JP2007265788A - Light-emitting diode lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting diode lighting device in which manufacturing processes can be simplified, and the optical characteristics are hardly deteriorated as a whole device. <P>SOLUTION: The device is equipped with a light guiding body 2 having a recessed part, a phosphor resin 3 which contains phosphor and is installed in the recessed part 2a, and a substrate 4 on which a light-emitting diode element 4a is arranged and is adhered by the phosphor resin. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting diode illumination device.

  A conventional surface light source device is shown in FIG. 3, and is composed of a light guide plate 1, point light sources 2 composed of LEDs, various control circuits (not shown), and the like.

  On the light incident surface 1 a provided at the edge portion of the light guide plate 1, point light sources 2 made of white LED chips are arranged to face each other. A light reflecting surface 11 is provided on the side of the light guide plate 1 that is positioned perpendicular to the point light sources 2. The light reflecting surface 11 is dot-printed or has a cone-shaped depression in order to prevent light from leaking and increase reflection efficiency.

  A light emitting surface 12 is provided on the side of the light guide plate 1 facing the light reflecting surface 11. Then, light from each LED of the point light source 2 is reflected by the light reflecting surface 11 and the three side surfaces 13 of the light guide plate 1, and most of the incident light finally passes through the lens sheet 4 from the light emitting surface 12. And is emitted as synthetic light having uniform directivity.

  A reflection sheet 5 is provided so as to wrap the light guide plate 1 except for the light exit surface 12 of the light guide plate 1. That is, the reflection sheet 5 is disposed so as to include the reflection surface 11 and the three side surfaces 13 of the light guide plate 1 so as to wrap the light guide plate 1.

  An insertion port 7 into which the point light source 2 made of LED is inserted is provided at a location facing the light guide plate 1 in the space 6 surrounded by the reflection sheet 5.

  The point light sources 2 mounted on the substrate 21 are opposed to the respective insertion openings 7 provided in the reflection sheet 5 fixed to the light guide plate 1, and are inserted into the space 6 from the insertion openings 7. And the board | substrate 21 with which each LED was mounted in the outer frame which is located in the outer side of the light-guide plate 1 with screws or an adhesive agent is fixed, and the point light source 2 ... is arrange | positioned in the predetermined position of the light-guide plate 1. FIG.

Each LED light from the point light source 2 enters the inside of the light guide plate 1, is reflected by the light reflection pattern provided on the light reflection surface 11 and the three side end surfaces 13, is repeatedly focused, and is emitted from the light emission surface 12 of the light guide plate 1. The light is emitted to the diffusion plate 3, diffused within a desired angle range by the lens sheet 4, and emitted as synthesized light. A liquid crystal display panel is disposed adjacent to the lens sheet 4. (FIG. 2 of patent document 1).
JP 2001-184924

  In the surface light source device of Patent Document 1, the substrate 21 on which each LED is mounted is fixed to the outer frame located outside the light guide plate 1 with screws or an adhesive, and the point light source 2 is placed at a predetermined position on the light guide plate 1. Is arranged.

  This surface light source device mainly includes a step of manufacturing a single LED, a step of arranging the LED on a substrate, and a step of fixing the substrate to a light guide plate. If it does so, it will pass through many processes and manufacture will become complicated.

  In addition, the plurality of LEDs alone may have slightly different optical characteristics such as luminosity and chromaticity for each LED. It will not fit. If it does so, the malfunction which a yield falls as the whole board | substrate or a surface light source device will generate | occur | produce.

  It is an object of the present invention to provide a light-emitting diode illuminating device that can simplify the manufacturing process and hardly deteriorate the optical characteristics of the entire device.

  The invention of claim 1 includes a light guide having a recess; a phosphor resin including a phosphor and disposed in the recess; a light-emitting diode element is disposed, and the phosphor resin is interposed through the phosphor resin. And a substrate bonded to the light guide.

  The light guide may be a resin such as an acrylic resin, and the recess may be a recess such as a groove or a hole. In the case of the groove, the phosphor resin can be poured uniformly, so that light from the light emitting diode element can be emitted almost uniformly. In the case of holes, if they are formed so as to have substantially the same volume and are filled with the phosphor resin substantially flush, an appropriate amount of resin can be obtained in each recess, and light is emitted almost uniformly by the light from the light emitting diode element. Can be made.

  The fluorescent substance should just be light-emitted with the light of a light emitting diode element. If the light of the light emitting diode element is blue, white light can be generated using a phosphor emitting yellow light. If the light emitted from the light emitting diode element is ultraviolet light, white light can be generated using red, green and blue light emitting phosphors.

  The resin containing the phosphor includes a resin such as a silicone resin or an epoxy resin, but a resin having sufficient adhesive strength to adhere the substrate is preferable.

  According to a second aspect of the present invention, in the light-emitting diode illuminating device according to the first aspect, the recess is formed on a side surface side of a light guide, and the phosphor emits light by light emitted from the light-emitting diode element. It is characterized by.

  The light guide has a rectangular shape and a recess is formed on the side surface, and a phosphor resin is disposed in the recess to efficiently introduce light emitted from the light emitting diode element into the light guide. It is something that can be done.

  According to a third aspect of the present invention, in the light-emitting diode illuminating device according to the first or second aspect, an air vent hole is formed in the substrate.

  According to the first aspect of the invention, the manufacturing process can be simplified and the optical characteristics of the entire apparatus can be made difficult to deteriorate.

  According to invention of Claim 2, light can be efficiently introduce | transduced in a light guide.

  According to the third aspect of the present invention, the light guide and the substrate can be brought into close contact with each other by removing the air from the air vent hole when bonding the substrates.

  Hereinafter, a light-emitting diode illuminating device showing an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a light-emitting diode illuminating device showing an embodiment of the present invention, and FIG. 2 is a diagram showing a step in manufacturing the light-emitting diode illuminating device.

  In FIG. 1, the light emitting diode illumination device 1 includes a light guide 2, a phosphor resin 3, and a substrate 4. The light guide 2 is formed in a rectangular parallelepiped shape by, for example, acrylic resin, and has a plurality of concave portions 2a on the side surface side. The wall surface of the recess may be transparent or translucent. In the case of transparency, the light from the phosphor or the light emitting diode is efficiently introduced into the light guide 2. Moreover, if it is translucent, the introduction ratio is reduced, but since light is diffused, the luminance uniformity on the surface of the light guide is further improved.

  The phosphor resin 3 is, for example, a silicone resin containing a phosphor, and is filled in the recess 2a. As the phosphor, a yellow-emitting phosphor is used. The substrate 4 and the light guide 2 are bonded by this silicone resin.

  A light emitting diode element 4a is mounted on the substrate 4 and an air vent hole 4b is formed. In order to emit a yellow light emitting phosphor, the light emitting diode element 4a uses a blue light emitting diode element. Then, in the light-emitting diode element 4a, blue and phosphor yellow are mixed and white light is introduced into the light guide.

  FIG. 2 shows one step in manufacturing the light-emitting diode illuminating device. The light-emitting diode illuminating device 1 is set in the vacuum chamber 5 and the inside of the chamber 5 is evacuated to guide light from the air vent hole 4b. By drawing air from the gap between the body 2 and the substrate 4, the light guide 2 and the substrate 4 are brought into close contact with each other, and the light guide 2 and the substrate 4 are bonded at once with a silicone resin containing the phosphor. is there.

  Therefore, the light-emitting diode illuminating device 1 can be manufactured all at once without going through many manufacturing steps as in the conventional example. Further, the recesses 2a are formed so as to have substantially the same volume, and the phosphor resin is filled almost flush with each other, so that an appropriate amount of resin can be formed in each recess, and the light of the light emitting diode element can be used. Light can be emitted almost uniformly.

The disassembled perspective view of the light emitting diode illuminating device which shows one Embodiment of this invention. The figure which similarly shows 1 process at the time of manufacture of a light emitting diode illuminating device. The perspective view of the conventional surface light source device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light emitting diode illuminating device, 2 ... Light guide, 2a ... Recessed part, 3 ... Phosphor resin, 4 ... Board | substrate, 4a ... Light emitting diode element, 4b ... Air vent hole.

Claims (3)

A light guide having a recess;
A phosphor resin including a phosphor and disposed in the recess;
A substrate on which a light emitting diode element is disposed and bonded to the light guide via the phosphor resin;
A light-emitting diode illuminating device comprising:   The light emitting diode illuminating apparatus according to claim 1, wherein the concave portion is formed on a side surface side of a light guide, and the phosphor emits light by light emitted from the light emitting diode element.   The light emitting diode illumination device according to claim 1, wherein an air vent hole is formed in the substrate.

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