JP2005302322A - Light source device and flat lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To scatter and reflect light advancing in the direction of an opening to a direction opposite to the opening, and to emit high-luminance light while preventing a light source such as an LED from being observed from an emission surface. <P>SOLUTION: In this light source device 2, in order to efficiently utilize, without loss, light having scattered from the openings 5, and light reaching parts between the adjacent openings 5 and parts other than the openings 5, scattering and reflecting parts 6 of a quantity obtained by adding one to the number of the openings 5 for emitting light emitted from semiconductor light-emitting elements 4 mounted on a bottom part 7 from the openings 5 facing to the bottom part 7, are formed at positions adjacent to the openings 5 and equivalent to the surface positions of the openings 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, light that has entered the light guide plate once from the incident portion of the light guide plate in the position adjacent to the opening portion of the light source device and in the same position as the surface position of the opening portion is directed toward the incident portion at the end face of the light guide plate facing the incident portion. The present invention relates to a light source device provided with a scattering reflection unit for returning reflected light back into the light guide plate.

  In addition, a scattering reflector is provided at a position adjacent to the light source device adjacent to the planar illumination device using the light source device or the light guide plate, or provided in parallel with the light source device adjacent to the light guide plate incident portion in the case. By providing the scattering reflection portion at the position, the light from the light source device once enters the light guide plate from the incident portion of the light guide plate, and the light reflected in the direction of the incident portion at the end face of the light guide plate facing the incident portion again. By returning to the inside of the light guide plate, the light from the light source device is emitted to the outside of the light guide plate by the light deflecting element provided on the front surface portion and the back surface portion of the light guide plate between the incident portion and the reflection end surface portion facing the incident portion. The present invention relates to a flat illuminating device in which light is repeatedly used until light source (LED or the like) of a light source device is not observed from an emission surface with high brightness.

  As a conventional light source device, there is known a light source device that uses a transparent material as a whole so as to fit into the light guide plate in order to allow much radiation light to enter the light guide plate or the like. Furthermore, a light source device is also known in which the light source device is miniaturized so that more light sources can be used, and a portion other than the emitting portion is omitted as much as possible.

  In addition, in order to emit light from the light source device from the surface portion or the like, the light guide plate is formed in a wedge shape so that the thickness of the light guide plate decreases as the distance from the incident portion increases, and the light from the incident portion tapers and leaks. There has been known a flat illumination device configured to emit a large amount of emitted light.

Furthermore, since the light source used in the light source device is a semiconductor light emitting element (LED or the like), the directivity is strong, and light with particularly high brightness and energy value goes straight to the center position of the light guide plate, and the incident portion of the light guide plate Proceed in the opposite direction. For this reason, there is known a flat illumination device having a configuration in which light is diffused when the incident portion is subjected to prism processing having a ridge in the direction from the front surface portion to the back surface portion so as to diffuse at the incident portion and enters the light guide plate. .
JP-A-10-293202

  As the above-described conventional light source device, in order to allow a large amount of radiated light to enter the light guide plate or the like, a transparent material is used for everything in the light guide plate so that the directivity of light from the light source is It enters the light guide plate as it is. For this reason, there is a problem that the emitted light as it is reflected in the directivity is obtained, and a spot of light is generated, and a problem that the utilization of the linear light entering the central portion of the light guide plate is small.

  Furthermore, in a light source device that is reduced in size so that more light sources can be used and where the portion other than the light emitting portion is omitted as much as possible, the light sources must be arranged in an array so that there is no fixed brightness spot. In this case, high-luminance outgoing light can be obtained, but there are problems in the use of a large number of light sources and economics such as electric power. Further, in such a light source device, when the incident portion of the light guide plate is larger than the light source device, the light that has once entered the light guide plate is incident on the incident portion of the portion without the light source device. There is a problem that when the light is reflected in the direction of the incident part at the end face and reaches the incident part, light leaks from the incident part to the outside.

  Further, as a conventional flat illumination device, in order to emit light from the light source device from the surface portion or the like, the light guide plate is formed in a wedge shape so that the thickness of the light guide plate is reduced as the distance from the light input portion is increased. In the flat illumination device having a configuration in which the light from the taper leaks and emits a large amount of emitted light, it is immediately emitted from the incident portion by the taper of the light guide plate, and bright emitted light can be obtained. Therefore, it is very effective when the light source is scattered light such as CCFL, but when the light source is a semiconductor light emitting element (LED or the like), the light source (LED or the like) is observed from the emission surface and is very attractive. There is a problem that gets worse.

  Furthermore, since the light source used in the light source device is a semiconductor light emitting element (LED or the like), the directivity is strong, and light with particularly high brightness and energy value goes straight to the center position of the light guide plate, and the incident portion of the light guide plate Proceed in the opposite direction. For this reason, in the planar illumination device configured to diffuse light when the incident portion is subjected to prism processing having a ridge in the direction from the front surface portion to the back surface portion so as to diffuse at the incident portion, the light is diffused when entering the light guide plate. Although a diffusion effect can be obtained in the lateral direction, a portion of the light traveling in the lateral direction leaks outside from the side surface portion of the light guide plate without being diffused in the thickness direction. As a result, there is a problem that the amount of light emitted from the emission surface cannot be obtained as expected.

  The present invention has been made in order to solve the above-described problems, and radiates from the opening of the light source device, enters the light guide plate once from the incident portion of the light guide plate, and faces the incident portion. The light reflected in the direction of the incident part in the light source device adjacent to the opening of the light source device is provided at the same position as the surface of the opening and returned to the light guide plate. A light source device that can emit high-luminance light by repeatedly using the light until it is emitted to the outside of the light guide plate by the deflecting element, and the light source (LED or the like) of the light source device is not observed from the emission surface, and the light source Scatter reflection is provided at a position adjacent to the light source device adjacent to the incident part of the flat illumination device or the light guide plate using the device, or at a position adjacent to the light input device adjacent to the light source plate on the case. By providing a light Light from the light source device enters the light guide plate once from the incident portion of the light guide plate and returns the light reflected in the direction of the incident portion at the end face of the light guide plate facing the incident portion to the light guide plate again. By repeatedly using light until the light is emitted to the outside of the light guide plate by the light deflection element provided on the front surface portion and the back surface portion of the light guide plate between the incident portion and the reflection end surface portion facing the incident portion, the brightness is increased. An object of the present invention is to provide a flat illumination device in which a light source (LED or the like) of a light source device is not observed from an emission surface.

  In order to achieve the above object, a light source device according to claim 1 of the present invention has a number of scattering reflection portions, which is increased by one with respect to the number of openings, adjacent to the openings and at a position equivalent to the surface position of the openings. It is characterized by providing.

  The light source device according to claim 1 has proceeded in the direction of the opening, since the number of scattering reflection parts increased by one with respect to the number of openings is provided adjacent to the opening and at the same position as the opening surface position. Light can be scattered and reflected in the direction opposite to the opening.

Further, in the flat illumination device according to claim 2, the number of scattering reflectors is one more than the number of openings emitted from the semiconductor light emitting element placed on the bottom from the opening facing the bottom. A light source device adjacent to the opening and provided at the same position as the opening surface position;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Including at least the light source device and a case for housing the light guide plate,
The light source device is close to the incident portion of the light guide plate, and the light from the opening portion is guided from the incident portion to the outside of the light guide plate by the light deflecting element, and is reflected toward the incident portion by the reflection end face portion. The light that has reached is scattered and reflected by the scattering reflector and returned again into the light guide plate, and the light is deflected from the front and / or back by the light deflecting element during the repetition of the light at the reflecting end face and the scattering reflector. Is emitted.

According to a second aspect of the present invention, there is provided a flat illuminating device having a number of scattering reflection portions that are increased by one with respect to the number of openings that emit radiation from a semiconductor light-emitting element placed on the bottom. A light source device that is adjacent to the portion and provided at the same position as the opening surface position;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Including at least the light source device and a case for housing the light guide plate,
The light source device is close to the incident portion of the light guide plate, and the light from the opening portion is guided from the incident portion to the outside of the light guide plate by the light deflecting element, and is reflected toward the incident portion by the reflection end face portion. The light that has reached is scattered and reflected by the scattering reflector and returned again into the light guide plate, and the light is deflected from the front and / or back by the light deflecting element during the repetition of the light at the reflecting end face and the scattering reflector. Therefore, all the light from the light source device can be emitted without loss regardless of the number of openings.

Furthermore, the flat illumination device according to claim 3 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
One more than the number of light source devices, a scattering reflection portion that is close to the incident portion of the light guide plate and is arranged in parallel with the light source device and scatters and reflects the reflected light from the reflection end surface portion to the light guide plate again,
Including at least a light source device, a light guide plate, and a case for housing the scattering reflection portion,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is scattered and reflected again to return light into the light guide plate, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. .

The flat illumination device according to claim 3 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
One more than the number of light source devices, a scattering reflection portion that is close to the incident portion of the light guide plate and is arranged in parallel with the light source device and scatters and reflects the reflected light from the reflection end surface portion to the light guide plate again,
Including at least a light source device, a light guide plate, and a case for housing the scattering reflection portion,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is returned to the light guide plate again after being scattered and reflected, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. Regardless of the number, all the light from the light source device can be emitted without loss.

A flat illumination device according to claim 4 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Based on the number of light source devices, at least the light source device and the light guide plate are accommodated, and the reflection and reflection portions that scatter and reflect the reflected light from the reflection end face to the light guide plate again at a position adjacent to the light source device and adjacent to the incident portion of the light guide plate. And a case provided with one more,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is scattered and reflected again to return light into the light guide plate, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. .

The flat illumination device according to claim 4 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Based on the number of light source devices, at least the light source device and the light guide plate are accommodated, and the reflection and reflection portions that scatter and reflect the reflected light from the reflection end face to the light guide plate again at a position adjacent to the light source device and adjacent to the light source plate And a case provided with one more,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is returned to the light guide plate again after being scattered and reflected, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. Regardless of the number, all the light from the light source device can be emitted without loss.

  Furthermore, in the flat illumination device according to claim 5, the light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner than the reflection end surface portion, and the thickness from the front surface portion to the back surface portion. The incident portion is any one of a taper shape thicker than the reflection end surface portion and a flat shape in which the thickness from the front surface portion to the back surface portion is equal between the incident portion and the reflection end surface portion.

  In the flat illumination device according to claim 5, the light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner than the reflection end surface portion, and the thickness from the front surface portion to the back surface portion is the incident portion. Since either one of the tapered shape that is thicker than the reflection end surface portion and the flat shape in which the thickness from the front surface portion to the back surface portion is equal between the incident portion and the reflection end surface portion, any light guide plate can be The light from the light source device that travels through the central portion (particularly the central portion with respect to the thickness direction) is reflected by the reflection end surface portion and returned to the incident portion direction.

  In particular, when the light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner at the incident portion than at the reflection end surface portion, emitted light or light deflecting element due to taper leak when the light travels in the direction of the reflection end surface portion The probability of reaching

  In addition, when the thickness from the front surface portion to the back surface portion is a tapered shape where the incident portion is thicker than the reflective end surface portion, the light reflected in the incident portion direction at the reflective end surface portion may cause a taper leak. Therefore, the probability of reaching the outgoing light and the light deflection element increases.

  According to a sixth aspect of the present invention, the light guide plate is characterized in that the light guide plate inclines the incident portion from the front surface portion toward the rear surface portion and is not parallel to the opening surface position of the light source device.

  In the flat illumination device according to claim 6, the light guide plate inclines the incident portion from the front surface portion toward the back surface portion and becomes non-parallel to the opening surface position of the light source device. The incident portion can be refracted in the front surface direction or refracted in the rear surface direction.

  The light source device according to claim 1 has proceeded in the direction of the opening, since the number of scattering reflection parts increased by one with respect to the number of openings is provided adjacent to the opening and at the same position as the opening surface position. Light can be scattered and reflected in the direction opposite to the opening. Thereby, the light which spread from the opening part, the light which arrived between the adjacent opening parts, or other than an opening part etc. can be utilized efficiently and without waste.

According to a second aspect of the present invention, there is provided a flat illuminating device having a number of scattering reflection portions that are increased by one with respect to the number of openings that emit radiation from a semiconductor light-emitting element placed on the bottom. A light source device that is adjacent to the portion and provided at the same position as the opening surface position;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Including at least the light source device and a case for housing the light guide plate,
The light source device is close to the incident portion of the light guide plate, and the light from the opening portion is guided from the incident portion to the outside of the light guide plate by the light deflecting element, and is reflected toward the incident portion by the reflection end face portion. The light that has reached is scattered and reflected by the scattering reflector and returned again into the light guide plate, and the light is deflected from the front and / or back by the light deflecting element during the repetition of the light at the reflecting end face and the scattering reflector. Therefore, all the light from the light source device can be emitted without loss regardless of the number of openings. As a result, there are no spots of light near the opening and near the non-opening in the vicinity of the incident part, and further, for example, a light source such as an LED is not observed from the exit surface side of the light guide plate, and high-luminance outgoing light is emitted. Can be obtained.

The flat illumination device according to claim 3 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
One more than the number of light source devices, a scattering reflection portion that is close to the incident portion of the light guide plate and is arranged in parallel with the light source device and scatters and reflects the reflected light from the reflection end surface portion to the light guide plate again,
Including at least a light source device, a light guide plate, and a case for housing the scattering reflection portion,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is returned to the light guide plate again after being scattered and reflected, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. Regardless of the number, all the light from the light source device can be emitted without loss. For this reason, there is no spot of light in the vicinity of the opening and near the non-opening in the vicinity of the incident part, and further, for example, a light source such as an LED is not observed from the exit surface side of the light guide plate, and high-luminance outgoing light is emitted. In addition, when using a plurality of light source devices, the effect can be obtained without being influenced by the pitch between the light source devices.

The flat illumination device according to claim 4 includes at least one light source device;
An incident part that guides light emitted from the light source device, a reflection end face located on the opposite side of the incident part, and a front part and a rear face provided with a light deflection element and connected to the incident part and the reflection end face at a substantially right angle A light guide plate comprising a portion,
Based on the number of light source devices, at least the light source device and the light guide plate are accommodated, and the reflection and reflection portions that scatter and reflect the reflected light from the reflection end face to the light guide plate again at a position adjacent to the light source device and adjacent to the light source plate And a case provided with one more,
Light from the light source device is guided from the incident part of the light guide plate to the light other than the light deflecting element and is emitted to the outside of the light guide plate by the reflection end face part, and the light reaching the incident part is reflected by the scattering reflection part. The light is returned to the light guide plate again after being scattered and reflected, and light is emitted from the front surface portion and / or the back surface portion by the light deflection element during the repetition of the light at the reflection end surface portion and the scattering reflection portion. Regardless of the number, all the light from the light source device can be emitted without loss. For this reason, there is no spot of light in the vicinity of the opening and near the non-opening in the vicinity of the incident part, and further, for example, a light source such as an LED is not observed from the exit surface side of the light guide plate, and high-luminance outgoing light is emitted. Since the scattering reflection portion is provided in the case, the scattering reflection portion can be used as a standard for attaching a light source device, a light guide plate, and the like.

  In the flat illumination device according to claim 5, the light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner than the reflection end surface portion, and the thickness from the front surface portion to the back surface portion is the incident portion. Since either one of the tapered shape that is thicker than the reflection end surface portion and the flat shape in which the thickness from the front surface portion to the back surface portion is equal between the incident portion and the reflection end surface portion, any light guide plate can be Light from the light source device traveling in the central portion (particularly the central portion with respect to the thickness direction) can be reflected by the reflection end face portion and returned to the incident portion direction.

  In particular, when the light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner at the incident portion than at the reflection end surface portion, emitted light or light deflecting element due to taper leak when the light travels in the direction of the reflection end surface portion The probability of reaching

  In addition, when the thickness from the front surface portion to the back surface portion is a tapered shape where the incident portion is thicker than the reflective end surface portion, the light reflected in the incident portion direction at the reflective end surface portion may cause a taper leak. Therefore, the probability of reaching the outgoing light and the light deflection element increases. Thereby, the light which goes back and forth between the incident part of these light-guide plates between reflection end surface parts can radiate | emit high-intensity light outside by the light deflection element provided in the surface part and the back surface part in the meantime.

  In the flat illumination device according to claim 6, the light guide plate inclines the incident portion from the front surface portion toward the back surface portion and becomes non-parallel to the opening surface position of the light source device. The incident portion can be refracted in the front surface direction or refracted in the rear surface direction.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The present invention also relates to a light source device in which the number of scattering reflection portions increased by one with respect to the number of openings from which light is emitted is adjacent to the opening and provided at the same position as the surface of the opening, and the light source device. The present invention relates to a flat illumination device using a light guide plate, a flat illumination device in which a scattering reflection portion provided in a light source device is individually incorporated, and a flat illumination device in which a scattering reflection portion is provided in a case itself. And by these structures, the incident part emits light other than the light emitted from the light source guided from the incident part into the light guide plate to the outside of the light guide plate by the light deflection element applied to the front surface part and the back surface part of the light guide plate. Is reflected in the direction of the incident part at the reflection end face located on the opposite side of the light, and the light reaching the incident part direction is scattered and reflected by the scattering reflection part and returned to the light guide plate again, and the reflection end face part and the scattering reflection part During the repetition of the light, light is emitted from the front surface portion and / or the back surface portion by the light deflection element. This provides a light source device and a flat illumination device that can emit all light from the light source device without loss regardless of the number of openings.

  1 is a schematic cross-sectional view of a light source device according to the present invention, FIG. 2 is a schematic front view of the light source device according to the present invention, FIG. 3 is an exploded perspective view showing a schematic configuration of a flat illumination device according to the present invention, and FIG. FIG. 5 is a schematic perspective view of a scattering / reflecting member having a scattering / reflecting part having a single structure employed in the flat lighting device according to the present invention, FIG. 5 is a schematic plan view of the flat lighting device using the scattering / reflecting member of FIG. FIG. 7 is a schematic perspective view of a scattering / reflecting member having a scattering / reflecting part having a connected configuration employed in the flat lighting device according to the present invention, FIG. 7 is a schematic plan view of the flat lighting device using the scattering / reflecting member of FIG. 9 is a schematic perspective view of a case having a scattering reflection portion, FIG. 9 is a schematic plan view of a flat illumination device using the case of FIG. 8, and FIGS. 10A and 10B are locus diagrams of light by the light source device according to the present invention. 11 (a), 11 (b) and 11 (c) are employed in the flat illumination device according to the present invention. 12A and 12B are a schematic cross-sectional view and a light locus diagram of an incident portion of a light guide plate employed in the flat illumination device according to the present invention, and FIG. 13 relates to the present invention. It is a locus diagram of the light of the light-guide plate employ | adopted as a plane illuminating device.

  As shown in FIG. 1, the light source device 2 places the semiconductor light emitting element 4 as a light source on the bottom 7 inside the opening 5 of the light source device 2, and increases by one with respect to the number of the openings 5. The number of scattering reflection parts 6 (in the case of FIG. 1, the number of the scattering reflection parts 6 is five, which is one more than the number of the opening parts 5 with respect to four openings 5). It is a configuration.

  In the light source device 2, the inclined portion 8 connects the bottom 7 inside the opening 5 to the scattering reflection portion 6. As shown in FIG. 2, the inclined portion 8 is made up of the wall surfaces of the four sides of the opening 5, and a space surrounded by the surfaces of the four inclined portions 8 and the bottom portion 7 is filled with a transparent resin 5 b or the like. The semiconductor light emitting element 4 is fixed more strongly, and the light emitted from the semiconductor light emitting element 4 is emitted from the opening 5 without being attenuated without being exposed to the air layer.

  Further, the inclined portion 8 allows light other than the straight light from the semiconductor light emitting element 4 out of the light emitted from the semiconductor light emitting element 4 (particularly including the emitted light from the four side surfaces of the semiconductor light emitting element 4). The light is reflected and emitted from the opening 5.

  In addition, the surface of the inclined portion 8 does not have to be completely mirror-like, and it is possible to obtain a broad reflected light having fine unevenness and to strengthen the bond (bonding) with the transparent resin to be filled. Can do.

  Further, as can be seen from FIG. 2, the light source device 2 includes a scattering reflection unit between the openings 5 (1), the openings 5 (2), the openings 5 (3), and the openings 5 (4). 6 (1), a scattering reflection part 6 (2), a scattering reflection part 6 (3), a scattering reflection part 6 (4), and a scattering reflection part 6 (5) are provided. That is, in the example of FIG. 2, the number of the scattering reflection sections 6 (one) increased by one with respect to the number of openings 5 (four) is provided.

  The light source device 2 is of an injection or transfer mold type, and a pattern is formed by molding resin 3 on the lead frame by inserting a lead frame made of phosphor bronze material or the like having a pattern shape formed on the resin by insert molding. Has been. However, the region where the semiconductor light emitting element 4 is placed and the opening 5 through which light is emitted from the semiconductor light emitting element 4 are empty spaces.

  Incidentally, the molding resin 3 forming the main body of the light source device 2 improves the light reflectivity to an insulating material such as a liquid crystal polymer made of, for example, modified polyamide, polybutylene terephthalate, nylon 46 or aromatic polyester. At the same time, in order to obtain a light shielding property, a mixture in which white powder such as barium titanate is mixed is subjected to heat injection molding. Further, in the mold for heat injection molding, the portion corresponding to the scattering reflection portion 6 is processed with fine irregularities.

  Further, although not shown here, an opening 5 is provided on the emission surface side of the semiconductor light emitting element 4 placed on the lead frame, and a power supply terminal or the like for supplying the semiconductor light emitting element 4 to the side surface in the opposite direction or the side surface side thereof is provided. Provide exposed.

  The semiconductor light-emitting element 4 is composed of a high-intensity light-emitting element made of a semiconductor chip of a compound such as a quaternary compound or an InGaAlP-based, InGaAlN-based, or InGaN-based compound. In the case of white light, the semiconductor light emitting element 4 is provided with an adhesive in which a fluorescent material that is a wavelength conversion material for yellow light emission is mixed into a colorless and transparent adhesive at the bottom 7, and further, a blue light emitting semiconductor light emitting element is provided thereon. 4 can be provided. As a result, blue light from the blue light emitting semiconductor light emitting element 4 itself is emitted directly toward the opening 5, and the light emitted from the blue light emitting semiconductor light emitting element 4 toward the bottom 7 reaches the wavelength conversion material and emits semiconductor light. When the yellow light emitted by the fluorescent material emitting yellow light from the element 4 is reflected by the bottom 7 and passes again through the semiconductor light emitting element 4 and exits in the direction of the opening 5, White light is emitted from the opening 5 by mixing with the blue emission color.

  Although not shown here, the light source device 2 is provided with an electrode terminal for electrical connection on the opposite side of the opening 5 or the rear side surface of the light source device 2 or by directly connecting a lead wire from the lead frame terminal. Lead wires may be provided.

  Next, a flat illumination device 1 using the light source device 2 is shown in FIG. As shown in FIG. 3, the flat illumination device 1 is configured by a light source device 2, a light guide plate 9, and a case 16.

  The light guide plate 9 includes an incident portion 10 that guides light, a reflection end surface portion 11 that is located on the opposite side of the incident portion 10, and a surface portion that is connected to the incident portion 10, the reflection end surface portion 11, and the side surface portion 12 at a substantially right angle. 13 and a back surface portion 14, and a light deflection element 15 is provided on the front surface portion 13 and the back surface portion 14. In the incident portion 10 of the light guide plate 9, the light source device 2 is disposed close to the incident portion 10. Thereby, the light from the opening 5 of the light source device 2 is guided to the incident portion 10 of the light guide plate 9.

  The light guide plate 9 is formed of transparent acrylic resin (PMMA) or polycarbonate (PC) having a refractive index of about 1.4 to 1.7, and the distance between the front surface portion 13 and the back surface portion 14 (the light guide plate 9). Is the smallest (thin) at the incident portion 10, and the distance (thickness) is the largest (thick) at the maximum separation distance (the reflective end face portion 11 located on the opposite side of the incident portion 10) from the incident portion 10. The shape is such that Therefore, the light source device 2 is disposed in the vicinity of the incident portion 10 where the light guide plate 9 is thin, and the light guide plate 9 is disposed on the opposite side (maximum separation distance) of the light guide plate 9.

  While the light deflection element 15 is provided on the front surface portion 13 and the back surface portion 14 of the light guide plate 9 and the incident light from the incident portion 10 proceeds to the reflection end surface portion 11 located on the opposite side of the incident portion 10, the light guide plate 9 is wedged. Even if it has a shape, there is no light beam that breaks the critical angle, and there is total reflection at the reflection end face part 11, and when the light beam travels again in the direction of the incident part 10, it is refracted by the light deflecting element 15. It can be emitted from.

Further, as shown in FIG. 13, the light incident on the light guide plate 9 proceeds into the light guide plate 9 within a range in which the refraction angle γ satisfies the expression 0 ≦ | γ | ≦ Sin ⁻¹ (1 / n). Since the refractive index of acrylic resin, which is a resin material used for the general light guide plate 9, is about n = 1.49, the light from the front surface portion 13 direction to the rear surface portion 14 direction of the incident portion 10 and the rear surface portion 14. The light from the direction toward the surface portion 13 has a maximum incident angle of 90 °. The refraction angle γ refracted at the incident portion 10 is in the range of γ = 0 to ± 42 °. However, only γ = −42 ° only in the direction of the back surface portion 14 in the vicinity of the front surface portion 13 and only γ = + 42 ° in the direction of the front surface portion 13 in the vicinity of the back surface portion 14.

  Further, the light incident on the light guide plate 9 within the range of the refraction angle γ = 0 to ± 42 ° is Sin α = (1 / n) at the boundary surface between the light guide plate 9 and the air layer (refractive index n = 1). ) Can be used to express the critical angle. For example, since the refractive index of acrylic resin, which is a resin material used for a general light guide plate 9, is about n = 1.49, the critical angle α is about α = 42 °, and the surface portion 13 of the light guide plate 9. If there is no convex or concave for deflecting the light beam on the back surface 14 or the critical angle α is not exceeded, the light in the light guide plate 9 is totally reflected by the front surface portion 13 and the back surface portion 14 toward the reflection end surface portion 11. Will go on.

  However, in the light guide plate 9 of FIGS. 3 and 13, the thickness of the light guide plate 9 (distance between the front surface portion 13 and the back surface portion 14 of the light guide plate 9) is opposite to the incident portion 10 from the incident portion 10. The thickness of the light guide plate 9 increases toward the reflection end surface portion 11 (maximum separation distance from the incident portion 10), and the incident light Ln1 travels to the reflection end surface portion 11 located on the opposite side of the incident portion 10 to guide the light guide plate. Even if 9 is wedge-shaped, there is no light beam that breaks the critical angle. Therefore, the light beam Ln2 that has been totally reflected at the front surface portion 13 and the back surface portion 14 is totally reflected at the reflection end surface portion 11, and is refracted by the light deflecting element 15 when the light beam Ln3 travels again toward the incident portion 10. The critical angle can be broken and the light beam Ln4 can be emitted from the surface portion 13. Here, although the convex and concave shapes of the light deflecting element 15 are described, both are refracted by the convex or concave inclined surface and emitted to the outside.

  Furthermore, as described above, since the light source device 2 has a structure in which the scattering reflection portion 6 adjacent to the opening 5 is provided, as shown in FIG. 10A, the inclined portion 8 of the light source device 2 and the like. Thus, light having a spread from the opening 5 enters from the incident portion 10 of the light guide plate 9, and the entered light travels in the light guide plate 9 with the width of the light Ld 1 and Ld 2 having the same spread, and the light guide plate 9 The light is reflected by the reflection end face part 11 and again reflected by light having a spread in the direction of the incident part 10.

  The light Lre1 reflected by the reflection end surface portion 11 shown in FIG. 10B is partially incident on the light reflected by the reflection end surface portion 11 so as to spread in the direction of the incident portion 10. Since the incident angle is small, the incident portion 10 transmits the light without reflecting, and reaches the light source device 2.

  At this time, the light reaching the scattering reflection part 6 of the light source device 2 is scattered and reflected by the scattering reflection part 6, and this reflected light again travels in the light guide plate 9 as light Lra 1 toward the reflection end face part 11. However, the light Lra1 is a part of the scattered and reflected light, and actually travels through the light guide plate 9 with a spread.

  In addition, the light Lr reflected by the side surface portion 12 of the light guide plate 9 out of the light that has traveled in the light guide plate 9 with the widths of the spread light Ld1 and Ld2 reaches the incident portion 10 again, and the incident angle is small. The light enters the light source device 2 without being reflected by the incident portion 10.

  At this time, the light reaching the scattering reflection part 6 of the light source device 2 is scattered and reflected by the scattering reflection part 6, and this reflected light again travels in the light guide plate 9 as light Lra 2 toward the reflection end face part 11. As before, this light Lra2 is a part of the scattered and reflected light, and actually travels in the light guide plate 9 with a spread.

  Thus, the light emitted from the light source device 2 and entering the light guide plate 9 and reaching the light deflection element 15 etc. is emitted to the outside, and the remaining light travels through the light guide plate 9 while repeating total reflection, The light that reaches the reflection end surface portion 11 of the light guide plate 9, is reflected there, and reaches the light deflection element 15 while being returned to the incident portion 10, is emitted to the outside, and the remaining light is transmitted from the incident portion 10 to the light source device 2. The light is emitted and scattered and reflected by the scattering reflection unit 6 of the light source device 2 to return the reflected light again into the light guide plate 9. By repeating these steps, the light emitted from the light source device 2 can be emitted to the outside of the light guide plate 9 without waste.

  Therefore, all light can be emitted from the light source device without loss. As a result, it is possible to emit high-luminance light, and there is no occurrence of luminance spots by repeating between the light guide plate 9 and the scattering reflection portion 6 of the light source device 2, and in general when the LED light source is used, the light guide plate The light source itself such as LED is observed from the light exit surface side, but the light source such as LED of the light source device 2 is not observed from the light exit surface 13 (14) side of the light guide plate 9 in order to eliminate these luminance differences.

  Further, although not shown, the light guide plate 9 of the present invention may be provided on the front surface portion 13 or the back surface portion 14 so that the quantity or area of the light deflection elements 15 increases as the light deflection elements 15 approach the incident portion 10. By doing in this way, the light incident from the incident part 10 from the light source device 2 first does not reach the critical angle α even if it reaches the front surface part 13 or the back surface part 14 of the light guide plate 9, and the front surface part 13. The light that travels to the reflection end surface 11 on the opposite side of the incident portion 10 while repeating total reflection at the back surface portion 14, is totally reflected at the reflection end surface portion 11, and travels again toward the incident portion 10 has a thickness of the light guide plate 9. There are many light rays that gradually become thinner and break the critical angle α, light rays that are close to the critical angle α, and the like, and light rays near the critical angle α are inclined surfaces of the light deflection element 15 while returning from the reflection end surface portion 11 to the incident portion 10. Causes refraction and the like from the exit surface (surface portion 13) Cum to.

  In the above description, the light guide plate 9 shown in FIG. 13 is used. However, the light guide plate 9 may have different shapes as shown in FIGS. In the light guide plate 9 shown in FIG. 11A, the thickness of the incident portion 10 and the reflection end surface portion 11 located on the opposite side of the incident portion 10 is the same, and the distance between the front surface portion 13 and the back surface portion 14 ( The thickness of the light guide plate 9) is always constant.

  In addition, the light guide plate 9 shown in FIG. 11B is different in thickness between the incident portion 10 and the reflection end surface portion 11 located on the opposite side of the incident portion 10, the incident portion 10 side is thicker, and the reflection end surface portion 11 side is closer. The distance between the front surface portion 13 and the back surface portion 14 (thickness of the light guide plate 9) becomes the maximum (thick) at the incident portion 10, and the maximum separation distance from the incident portion 10 (the opposite side of the incident portion 10). The reflection end face portion 11) is shaped such that the distance (thickness) is minimized (thin). Therefore, the light source device 2 is disposed in the vicinity of the incident portion 10 where the light guide plate 9 is thick, and the light guide plate 9 is thin on the opposite side (maximum separation distance) of the light source device 2.

  Furthermore, the light guide plate 9 shown in FIG. 11C is different in thickness between the incident portion 10 and the reflective end surface portion 11 located on the opposite side of the incident portion 10, the incident portion 10 side is thin, and the reflective end surface portion 11 side is thin. The distance between the front surface portion 13 and the back surface portion 14 (thickness of the light guide plate 9) is minimum (thin) at the incident portion 10, and the maximum separation distance from the incident portion 10 (the opposite side of the incident portion 10). In the reflection end face portion 11), the distance (thickness) is maximized (thick). Therefore, the light source device 2 is disposed in the vicinity of the incident portion 10 where the light guide plate 9 is thin, and the light guide plate 9 is disposed on the opposite side (maximum separation distance) of the light guide plate 9.

  Even if the shape of the light guide plate 9 is different as described above, the probability of emission by the taper leak or the light deflection element 15 (temporal change with respect to the emitted light from the light source device 2) changes somewhat, but finally the light guide plate 9 All light can be emitted while going back and forth.

  Furthermore, here, a schematic cross-sectional shape of the incident portion 10 of the light guide plate 9 is shown in FIG. The emitted light L0 from the light source device 2 is guided into the light guide plate 9 from the incident portion 10 of the light guide plate 9, travels into the light guide plate 9, is reflected by the reflection end surface portion 11, and returns to the incident portion 10. In the process of being scattered and reflected by the scattering reflection unit 6 of the device 2 and returning to the light guide plate 9 again, the incident angle at the time of incidence from the light source device 2, the exit angle of the return reflected light from the incident unit 10, and the scattering A change with respect to the incident angle at the time of re-incident from the reflecting portion 6 is given to control the deflection to the exit surface.

  For example, in FIG. 12A, the incident portion 10 has an inclined incident portion 10 a in which the front surface portion 13 protrudes from the rear surface portion 14 with respect to the rear surface portion 14 direction from the front surface portion 13, and from the opening portion 5 of the light source device 2. The outgoing light L0 is refracted in the direction of the back surface portion 14 by the inclined incident portion 10a. When the back surface portion 14 is a mirror surface, the refracted light La1 is reflected by the back surface portion 14 and travels toward the reflection end surface portion 11 as a light beam La2.

  Further, when the refracted light La1 is refracted by the light deflection element 15 present on the back surface portion 14, it is emitted from the back surface portion 14 of the light guide plate 9 as a light beam La3. Further, when the refracted light La1 is reflected by the light deflecting element 15 existing on the back surface portion 14, the light beam La4 travels in the direction of the surface portion 13 of the light guide plate 9 as the light beam La4, and from the surface portion 13 if the incident angle to the surface portion 13 is small. Exit.

  Similarly, for example, in FIG. 12B, the incident portion 10 has an inclined incident portion 10 b in which the rear surface portion 14 protrudes from the front surface portion 13 with respect to the direction of the rear surface portion 14 from the front surface portion 13. The outgoing light L0 from the part 5 is refracted in the direction of the surface part 13 by the inclined incident part 10b. When the surface portion 13 is a mirror surface, the refracted light Lb1 is reflected by the surface portion 13 and travels in the direction of the reflection end surface portion 11 as a light beam Lb2.

  Further, when the refracted light Lb1 is refracted by the light deflecting element 15 present on the surface portion 13, it is emitted from the surface portion 13 of the light guide plate 9 as a light beam Lb3. Further, when the refracted light Lb1 is reflected by the light deflecting element 15 existing on the front surface portion 13, the light beam Lb4 travels in the direction of the back surface portion 14 of the light guide plate 9, and from the back surface portion 14 if the incident angle to the back surface portion 14 is small. Exit.

  Thus, since the incident part 10 of the light guide plate 9 is not parallel to the surface position of the opening 5 of the light source device 2, the light emitted from the opening 5 of the light source device 2 is directed toward the surface 13 by the incident part 10. It can be refracted or refracted in the direction of the back surface 14. For this reason, the whole emitted light from the light source device 2 can be deflected in the direction of the back surface portion 14 or the surface portion 13.

  Further, while returning from the reflection end face portion 11 to the incident portion 10, the light is emitted from the emission surface (surface portion 13), and as the incident portion 10 is approached (returned), a larger number of light rays are emitted corresponding to the attenuation of the amount of light. Since it is necessary to increase the amount of light to be emitted as it approaches the incident portion 10 in order to emit from the surface portion 13), the amount or area of the light deflecting element 15 increases as it approaches the incident portion 10, thereby generating uniform emitted light. Can be obtained.

  By the way, the scattering reflection part 6 can also be provided in addition to the light source device 2 described above. 4 to 7 show a configuration example of the scattering reflection member 6 (b) having the scattering reflection portion 6. 4 is a schematic perspective view of a scattering reflection member 6 (6b) having a scattering reflection portion 6 having a single structure, FIG. 5 is a schematic plan view of a flat illumination device using the scattering reflection member of FIG. 4, and FIG. FIG. 7 is a schematic perspective view of a scattering reflection member 6 (6b) having a scattering reflection portion 6 of an integrated connection configuration, and FIG. 7 is a schematic plan view of a flat illumination device using the scattering reflection member of FIG.

  The scattering reflection member 6 (6b) shown in FIGS. 4 and 6 is formed of a thermoplastic resin such as acrylic resin (PMMA) or polycarbonate (PC) and mixed with a white material such as titanium oxide to increase the reflection efficiency. ing. Moreover, the scattering reflection member 6 (6b) has the scattering reflection part 6 which gave the reflectiveness by performing metal vapor deposition etc., and was processed in the fine unevenness | corrugation in order to carry out scattering reflection. The scattering reflection member 6 (6b) is close to the incident portion 10 of the light guide plate 9 while the scattering reflection portion 6 coincides with the surface position of the opening 5 of the light source device 2 when the flat illumination device is configured. Are arranged as follows.

  The scattering reflection member 6 (6b) in FIG. 4 is formed in a frame shape having the scattering reflection portion 6 on one end face, and the uneven reflection portion 6 is processed only on the portion of the scattering reflection portion 6 so that the reflective white or metal is deposited. Etc. are given. At a position facing the opposite side of the scattering reflection portion 6, for example, an end portion 6be is provided according to an inner end portion of the case 16 (dimensions required for a flat illumination device, a liquid crystal display device, etc.) as shown in FIG. Both sides between the scattering reflection part 6 and the end part 6be are connected by a side face 6bs.

  When this scattering reflection member 6 (6b) is used, for example, as shown in FIG. 5, the light guide plate 9 is disposed in the upper half of the case 16, and three light sources are provided on the incident portion 10 side of the light guide plate 9. When the devices 5 are arranged at a predetermined interval, the scattering reflection parts 6 are located between the light source devices 5 and at both end portions, and the scattering reflection members 6 (6b) are arranged. In FIG. 5, a portion surrounded by the scattering reflection portion 6, the end portion 6 be, and both side surfaces 6 bs of each scattering reflection member 6 (6 b) between the opposing side surfaces 6 bs of each scattering reflection member 6 (6 b) in the case 16. In this space, for example, electronic parts can be placed. Further, the scattering reflection member 6 (6b) can serve as a stopper for the light guide plate 9. Further, in the single light source device 2 (one opening portion 5), the scattering reflection portions 6 are positioned at both ends of the light source device 5 on the light emitting surface side, and the scattering reflection members 6 (6b) are disposed. As described above, the scattering reflection member 6 (6 b) shown in FIG. 4 can be freely used without being influenced by the number of the light source devices 2.

  The scattering reflection member 6 (6b) in FIG. 6 is formed in a comb-like shape having a plurality of scattering reflection portions 6 on one end face, and only the scattering reflection portion 6 portion is processed with fine irregularities so that a reflective white or Metal deposition etc. are given. At a position facing the opposite side of the scattering reflection section 6, for example, a plurality of scattering reflection sections 6 according to the inner end of the case 16 (dimensions required for a flat illumination device, a liquid crystal display device, etc.) as shown in FIG. Are formed integrally by connecting each scattering reflection portion 6 and the end portion 6be with each side surface 6bs.

  When the scattering reflection member 6 (6b) is used, for example, as shown in FIG. 7, the light guide plate 9 is disposed in the upper half of the case 16, and two light sources are provided on the light incident plate 10 side of the light guide plate 9. When the device 5 is arranged at a predetermined interval, the scattering reflection part 6 is located on both sides of the two light source devices 5 and the scattering reflection member 6 (6b) is arranged. In FIG. 7, a portion surrounded by the scattering reflection portion 6, the end portion 6 be, and both side surfaces 6 bs of each scattering reflection member 6 (6 b) between the opposing side surfaces 6 bs of each scattering reflection member 6 (6 b) in the case 16. In this space, for example, electronic parts can be placed. Further, the scattering reflection member 6 (6b) can serve as a stopper for the light guide plate 9.

  Further, FIG. 8 shows a configuration example in which the scattering reflection portion 6 (6c) is provided in the case 16, and FIG. 9 shows a schematic plan view of a flat illumination device using the case 16 in FIG. The scattering / reflecting part 6 (6 c) shown in FIG. 8 secures a space (a flying state) for placing the light source device 2 on the inner bottom part 16 b of the case 16 and is equivalent to the surface position of the opening 5 of the light source device 2. Are integrally formed with the case 16 so that the scattering reflection part 6 (6c) coincides with the incident part 10 of the light guide plate 9, and fine irregularities are processed at a position facing the incident part 10 of the light guide plate 9. Applied, reflective white or metal deposition.

  When using the case 16 provided with the scattering reflection portion 6 (6c), for example, as shown in FIG. 9, the light source device 5 is disposed between the scattering reflection portions 6 (6c), and the light emission surface of the light source device 5 is provided. The light guide plate 9 is disposed in the upper half of the case 16 on the side. In FIG. 9, for example, an electronic component or the like can be placed in the space in the lower half of the case 16.

  Although not shown here, the scattering reflection section 6 (6c), the light source device 2, the light guide plate 9 and the like are mounted on the case 16, but the insulating circuit is provided with an electric circuit, electronic component mounting, and the like. In addition, the scattering reflection section 6 (6c), the light source device 2, and the light guide plate 9 may be placed.

  The case 16 is molded from a strong thermoplastic resin mixed with a white material such as titanium oxide, a plastic resin such as a thermoplastic resin, or a metal such as an aluminum die cast, and the light guide plate 9 or the light source device. 2 (scattering / reflecting part 6 in some cases) and the like, and in some cases, a diffuser (not shown) is placed on the top.

  Although not shown here, the diffuser is made of transparent acrylic resin (PMMA), polycarbonate (PC) or the like, and has fine irregularities on the front and back surfaces. Thereby, when the light emitted from the light guide plate 9 passes through the diffuser, one light beam is diffused in a random direction, and a strong luminance portion, a dark portion, or the like can be made inconspicuous.

  Thus, the present invention enters the light emitted from the opening of the light source device into the light guide plate once from the incident portion of the light guide plate, and proceeds in the direction of the reflection end face of the light guide plate facing the opposite side of the incident portion, In the process of returning the light reflected by the reflection end face in the direction of the incident portion, the residual light that is not emitted to the outside from the front surface or the back surface is once emitted from the incident portion of the light guide plate, and the scattering reflection portion provided in the light source device The light emitted from the light source device is scattered and reflected back to the light guide plate by the scattering / reflecting portion incorporated in the flat lighting device or the scattering reflection portion provided in the case itself of the flat lighting device. From the light source device by repeatedly using the light until it is emitted to the outside of the light guide plate by the light deflecting element applied to the front surface portion and the back surface portion of the light guide plate during the repetition of the light between the reflection end face portion and the scattering reflection portion. All light without loss A light source device and a planar illumination device is never observed from the exit surface of the light source (LED or the like) of the light source device with high luminance in order to be.

It is a schematic sectional drawing of the light source device which concerns on this invention. It is a schematic front view of the light source device which concerns on this invention. It is a disassembled perspective view which shows schematic structure of the planar illuminating device which concerns on this invention. It is a schematic perspective view of the scattering reflection member which has the scattering reflection part of the single-piece | unit structure employ | adopted as the plane illuminating device which concerns on this invention. It is a schematic plan view of the plane illuminating device using the scattering reflection member of FIG. It is a schematic perspective view of the scattering reflection member which has the scattering reflection part of the connection structure employ | adopted as the planar illuminating device which concerns on this invention. It is a schematic plan view of the plane illuminating device using the scattering reflection member of FIG. It is a schematic perspective view of a case which has a scattering reflection part. It is a schematic plan view of the plane illuminating device using the case of FIG. (A), (b) It is the locus diagram of the light by the light source device which concerns on this invention. (A), (b), (c) It is a schematic sectional drawing of the light-guide plate employ | adopted as the planar illuminating device which concerns on this invention. (A), (b) It is a schematic sectional drawing of the entrance part of the light-guide plate employ | adopted as the planar illuminating device which concerns on this invention, and a locus diagram of light. It is a locus diagram of the light of the light-guide plate employ | adopted as the planar illuminating device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar illumination apparatus 2 Light source apparatus 3 Molding resin 4 Semiconductor light emitting element 5 (5 (1) -5 (4)) Opening part 5 b Transparent resin 6 (6 (1) -6 (5)), 6 (6c) Scattering reflection Part 6 (6b) Scattering reflection member 6be End part 6bs Side face 7 Bottom part 8 Inclined part 9 Light guide plate 10 Incident part 10a, 10b Inclined incident part 11 Reflecting end face part 12 Side part 13 Surface part 14 Back part 15 Optical deflecting element 16 Case 16b Inner bottom γ Refraction angle n Refractive index α Critical angle Ln1, L0 Incident light Ln2, Ln3, Ln4 Ray Ld1, Ld2, Lre1, Lra1, Lr, Lra2 Light La1. La2, La3, La4, Lb1, Lb2, Lb3, Lb4 Refracted light

Claims (6)

In the light source device that emits the emitted light from the semiconductor light emitting element placed on the bottom from the opening facing the bottom,
A light source device characterized in that the number of scattering reflection portions increased by one with respect to the number of the opening portions is provided adjacent to the opening portion and at a position equivalent to the surface position of the opening portion. Adjacent to the opening and the opening is a number of scattering reflectors, which is one more than the number of the opening from which the emitted light from the semiconductor light emitting element placed on the bottom is emitted from the opening facing the bottom. A light source device provided at a position equivalent to the surface position of the part;
An incident portion that guides light emitted from the light source device, a reflection end surface portion that is located on the opposite side of the incident portion, and a surface portion that is provided with a light deflection element and is connected to the incident portion and the reflection end surface portion at a substantially right angle. And a light guide plate comprising a back surface portion,
Including at least the light source device and a case for housing the light guide plate,
The light source device is brought close to the incident portion of the light guide plate, and the light from the opening is guided from the incident portion, and light other than the light deflecting element emitted to the outside of the light guide plate is incident on the reflection end surface portion. During the repetition of light between the reflection end face part and the scattering reflection part, the light that is reflected in the direction of the light and scattered and reflected by the scattering reflection part is returned to the light guide plate again. Further, a light is emitted from the front surface portion and / or the back surface portion by the light deflection element. At least one light source device;
An incident portion that guides light emitted from the light source device, a reflection end surface portion that is located on the opposite side of the incident portion, and a surface portion that is provided with a light deflection element and is connected to the incident portion and the reflection end surface portion at a substantially right angle. And a light guide plate comprising a back surface portion,
A scattering reflector that is close to the incident portion of the light guide plate and is arranged in parallel with the light source device, and is one more than the number of the light source devices that scatter-reflect the reflected light from the reflection end surface portion to the light guide plate;
Including at least a light source device, a light guide plate, and a case for housing the scattering reflection portion,
The light from the light source device is guided from the incident part of the light guide plate to the light deflecting element, and the light other than the light deflected from the light guide plate is reflected toward the incident part by the reflection end surface part. The light that has reached is scattered and reflected by the scattering and reflecting portion and returned again into the light guide plate, and the light deflection element causes the surface portion and the surface portion and the light to be returned between the reflecting end face portion and the scattering and reflecting portion. A flat illumination device that emits light from the back surface portion. At least one light source device;
An incident portion that guides light emitted from the light source device, a reflection end surface portion that is located on the opposite side of the incident portion, and a surface portion that is provided with a light deflection element and is connected to the incident portion and the reflection end surface portion at a substantially right angle. And a light guide plate comprising a back surface portion,
A scattering / reflecting portion that houses at least the light source device and the light guide plate, and scatters and reflects the reflected light from the reflection end surface portion to the light guide plate again at a position adjacent to the incident portion of the light guide plate and adjacent to the light source device. A case provided one more than the number of the light source devices,
The light from the light source device is guided from the incident part of the light guide plate to the light deflecting element, and the light other than the light deflected from the light guide plate is reflected toward the incident part by the reflection end surface part. The light that has reached is scattered and reflected by the scattering and reflecting portion and returned again into the light guide plate, and the light deflection element causes the surface portion and the surface portion and the light to be returned between the reflecting end face portion and the scattering and reflecting portion. A flat illumination device that emits light from the back surface portion. The light guide plate has a tapered shape in which the thickness from the front surface portion to the back surface portion is thinner than the reflection end surface portion in the incident portion, and the thickness from the front surface portion to the back surface portion is in the direction of the incident portion. The taper shape is thicker than the reflection end surface portion, and the thickness from the front surface portion to the back surface portion is any one of a flat shape equal in the incident portion and the reflection end surface portion. The flat illuminating device in any one of 2-4. The said light guide plate inclines the said incident part with respect to the said back surface part direction from the said surface part, and becomes non-parallel with respect to the said opening part surface position of the said light source device. A flat illumination device according to claim 1.

Images