JP2014216293A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of lightening surrounding areas.SOLUTION: A lighting device 10 includes a light guide panel 22, a diffuser panel 23 and a light emitting element 36. The light guide panel 22 includes an incident surface 28 which is provided on a side part 27 and also on an opposite side to a main irradiation direction, and an emission surface 29 provided to face the incident surface in the main irradiation direction, so as to introduce the light incident from the incident surface 28 and emit the light to the main irradiation direction from the emission surface 29. The diffusion panel 23 covers the outside including the side part 27 of the light guide panel 22. The light emitting element 36 has a light emitting part 36a emitting light. Light emitted from the light emitting part 36a is incident on the incident surface 28 of the light guide panel 22 and part of the light emitted from the light emitting part 36a is incident on the side part 32 of the diffusion panel 23 covering the side part 27 of the light guide panel 22.

Description

  Embodiments described herein relate generally to a lighting device using a light guide plate.

  2. Description of the Related Art Conventionally, there is an illumination device in which light from a light emitting element is incident on a light guide plate and light is emitted from the surface portion of the light guide plate, thereby obtaining uniform surface light emission.

  The light guide plate is formed in a rectangular flat plate shape, and a light emitting element is arranged to face the end face of the light guide plate. The light-emitting element is mounted on a substrate, and this substrate is attached to a non-light-transmitting frame that covers and supports the periphery of the light guide plate.

JP 2012-109055 A

  However, in the illumination device using the light guide plate, the light emitting element is disposed facing the end face of the light guide plate, so that the light emitting element and the periphery of the light guide plate are covered with a non-transparent frame, There is a case where no light is emitted around the illumination device, and the illumination device is dark and uncomfortable.

  The problem to be solved by the present invention is to provide a lighting device that can brighten the surroundings.

  The lighting device of the embodiment includes a light guide plate, a diffusion plate, and a light emitting element. The light guide plate has an incident surface provided on the side and opposite to the main irradiation direction, and an output surface provided opposite to the main irradiation direction, and guides light incident from the incident surface. The light exits from the exit surface in the main irradiation direction. The diffusion plate covers the outside including the side portion of the light guide plate. The light emitting element includes a light emitting unit that emits light, and light emitted from the light emitting unit is incident on an incident surface of the light guide plate, and a part of the light emitted from the light emitting unit covers a side portion of the light guide plate. Incident to the side.

  According to the present invention, a part of the light from the light emitting element is incident on the side of the diffusion plate that covers the side of the light guide plate, so that the light can be emitted from the diffusion plate to the side. It can be expected to brighten the surroundings.

It is sectional drawing of the light emission unit of the illuminating device which shows 1st Embodiment. It is sectional drawing of an illuminating device same as the above. It is sectional drawing of the light emission unit of the illuminating device which shows 2nd Embodiment.

  Hereinafter, a first embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 2, the lighting device 10 is a ceiling-mounted lighting fixture having a circular peripheral shape, and is attached to a hook ceiling body 12 installed on the ceiling surface 11 via an adapter 13.

  The lighting device 10 includes a fixture main body 14, a light emitting unit 15 attached to the lower surface of the fixture main body 14, and a lighting unit 16 disposed in the fixture main body 14.

  The instrument main body 14 is made of, for example, metal, and an attachment surface portion 17 to which the light emitting unit 15 is attached is formed on the lower surface, and a side surface portion 18 is raised from the periphery of the attachment surface portion 17. An adapter guide 19 to be attached to the adapter 13 is attached to the center of the upper surface of the instrument body 14.

  As shown in FIG. 1 (note that FIG. 1 is a cross-sectional view, but hatching of cross-sectional symbols is omitted to show the trajectory of light), the light-emitting unit 15 has a lower main light irradiation direction. A light guide plate 22, a diffusion plate 23 covering the light guide plate 22, and a light emitting module 24 that emits light, and the lower side is a main light irradiation direction.

  The light guide plate 22 is formed in a circular outer shape when viewed from the lower surface with a material having a high transmittance such as a transparent acrylic resin having a thickness of about 2 to 2.5 mm, and a flat light emitting surface portion 26 is formed in the central region. In the peripheral region of the light emitting surface portion 26, a side portion 27 that is a side portion that intersects the main irradiation direction and is curved upward is the opposite side to the main irradiation direction. The peripheral end surface of the light guide plate 22 is directed to the opposite side to the main irradiation direction by a curved side portion 27, and is formed as an annular incident surface 28 on which light is incident. The light emitting surface portion 26 is formed with an emission surface (light emitting surface) 29 that emits light on the lower surface facing the main irradiation direction. On the emission surface 29, a dot pattern for emitting light guided in the light guide plate 22 is formed. Reflecting means such as a reflecting sheet or a reflecting plate is provided on the back side of the light guide plate 22.

  The diffusing plate 23 has, for example, milky white acrylic resin having light permeability or milky white diffusing surface treatment on the inner or outer surface of a transparent acrylic resin, and has light transmittance and light diffusibility. . The diffuser plate 23 is formed in a circular outer shape when viewed from the lower surface, and covers the entire outer side from the light emitting surface portion 26 to the side portion 27 of the light guide plate 22, and has a flat central surface portion 31 in the central region. In the peripheral region of the central surface portion 31, a side portion 32 that is curved upward is formed opposite to the main irradiation direction. The central surface portion 31 is in contact with the light exit surface 29 of the light emitting surface portion 26 of the light guide plate 22 or is opposed with a slight gap. Further, the side portion 32 is disposed away from the side portion 27 of the light guide plate 22, and the gap between the side portion 32 and the side portion 27 is larger than that between the central surface portion 31 and the light emitting surface portion 26. A space portion (outer space portion) 33 is formed.

  The light emitting module 24 includes a substrate 35 and a plurality of light emitting elements 36 that are semiconductor light emitting elements mounted on the substrate 35.

  The substrate 35 is formed in a disk shape substantially the same as the outer diameter of the diffusion plate 23, and the lower surface is formed on a mounting surface on which a wiring pattern for mounting the plurality of light emitting elements 36 is formed.

  As the light emitting element 36, for example, a surface mount type SMD package type LED element is used. In this SMD package, an LED bare chip is arranged in a case and sealed with a sealing resin containing a phosphor, and the surface of the sealing resin is configured as a light emitting portion 36a that emits light. The plurality of light emitting elements 36 are annularly arranged on the mounting surface of the substrate 35 such that the light emitting portions 36a face the annular incident surface 28 of the light guide plate 22. In the light emitting element 36, the center of the light emitting portion 36a is offset outward from the center in the width direction of the incident surface 28 of the light guide plate 22, and a part of the outer side of the light emitting portion 36a is incident on the incident surface 28 (side portion 27 of the light guide plate 22). ) Is arranged so that a part of the direct light emitted from the light emitting part 36a is directly incident on the side part 32 of the diffusion plate 23. Note that the plurality of light emitting elements 36 may have the same emission color, or may have different emission colors or change the emission color.

  The lighting unit 16 has a power input side connected to a commercial AC power source through the adapter 13 and the hooking ceiling body 12, and a load output side connected to the plurality of light emitting elements 36 through the substrate 35 of the light emitting module 24. Then, the lighting unit 16 converts AC power into predetermined DC power and supplies it to the light emitting element 36 to light the light emitting element 36.

  When the lighting device 10 configured as described above is turned on, light emitted from the light emitting portion 36a of the light emitting element 36 is mainly incident into the light guide plate 22 from the incident surface 28 of the light guide plate 22, and the light guide plate 22 The light is guided from the side portion 27 to the light emitting surface portion 26 while being reflected from the inside 22 and emitted from the emission surface 29, and further enters the diffusion plate 23, and is diffused and irradiated from the surface of the diffusion plate 23 in the main irradiation direction.

  Further, a part of the direct light emitted from the light emitting part 36a of the light emitting element 36 directly enters the side part 32 of the diffusion plate 23 through the space part 33, and diffuses sideward or upward from the side part 32 of the diffusion plate 23. Irradiated.

  Therefore, the entire surface of the diffusion plate 23 including the side portion 32 emits light with uniform brightness.

  In this way, a part of the direct light from the light emitting element 36 is directly incident on the side portion 32 of the diffusion plate 23 that covers the side portion 27 of the light guide plate 22, thereby allowing light to be emitted from the diffusion plate 23 to the side. And the surroundings of the lighting device 10 can be brightened. Thereby, the ceiling surface 11 on which the illumination device 10 is installed can also be brightened, and the uncomfortable feeling when the illumination device 10 using the light guide plate 22 is installed can be reduced.

  Further, the side portion 27 of the light guide plate 22 is curved from the incident surface 28 to the output surface 29, and the side portion 32 of the diffusion plate 23 is curved corresponding to the side portion 27 of the light guide plate 22. Even if the thin light guide plate 22 and the diffusion plate 23 are used, the light can be irradiated to the side.

  Further, since the space 33 is formed between the side 27 of the light guide plate 22 and the side 32 of the diffusion plate 23, the light from the light emitting element 36 enters a wide range of the side 32 of the diffusion plate 23. Therefore, the side portion 32 of the diffusion plate 23 can emit light with uniform brightness. In addition, by adjusting the distance of the space portion 33 between the side portion 27 of the light guide plate 22 and the side portion 32 of the diffusion plate 23, the amount of light emitted from the side portion 32 of the diffusion plate 23 to the side is reduced. Can be adjusted.

  Next, FIG. 3 shows a second embodiment. In addition, while using the same code | symbol about the same structure as 1st Embodiment, description is abbreviate | omitted about the structure and effect.

  A reflection plate 40 is disposed inside the light guide plate 22. The reflecting plate 40 includes a main irradiation direction reflecting portion 41 facing the upper side of the light emitting surface portion 26 of the light guide plate 22, and a side reflecting portion 42 as a reflecting portion facing the inside of the side portion 27 of the light guide plate 22. A space portion (inner space portion) 43 is formed between the side portion 27 of the light guide plate 22 and the side surface reflection portion 42.

  In the light emitting element 36, the light emitting part 36a protrudes both outside and inside the incident surface 28 of the light guide plate 22, and a part of the direct light emitted inward from the light emitting part 36a is directly incident on the side reflecting part 42. Are arranged as follows.

  The light emitted from the light emitting portion 36a of the light emitting element 36 is incident on the light guide plate 22 mainly from the incident surface 28 of the light guide plate 22, and the light emitting surface portion 26 is reflected from the side portion 27 while reflecting the light guide plate 22. And is reflected toward the emission surface 29 by the reflection portion 41 of the main irradiation direction of the reflection plate 40 and emitted from the emission surface 29, and further enters the diffusion plate 23, and is irradiated from the surface of the diffusion plate 23. Diffuse irradiation in the direction.

  Further, a part of the direct light emitted from the light emitting part 36a of the light emitting element 36 directly enters the side part 32 of the diffusion plate 23 through the space part 33, and diffuses sideward or upward from the side part 32 of the diffusion plate 23. Irradiated.

  Further, a part of the direct light emitted from the light emitting part 36a of the light emitting element 36 is directly incident on the side reflecting part 42 through the space part 43, and the light reflected by the side reflecting part 42 is transmitted through the side part 27 of the light guide plate 22. Then, the light is diffused and irradiated from the side portion 32 of the diffusion plate 23 to the side and upward.

  Therefore, the entire surface of the diffusion plate 23 including the side portion 32 emits light with uniform brightness.

  In this way, a part of the direct light from the light emitting element 36 is reflected by the side reflecting portion 42 and incident on the side portion 32 of the diffusion plate 23, whereby the light can be emitted from the diffusion plate 23 to the side. The surroundings of the lighting device 10 can be brightened. Thereby, the ceiling surface 11 on which the illumination device 10 is installed can also be brightened, and the uncomfortable feeling when the illumination device 10 using the light guide plate 22 is installed can be reduced.

  Further, since the space portion 43 is formed between the side portion 27 and the side reflection portion 42 of the light guide plate 22, the light from the light emitting element 36 can easily enter the wide range of the side reflection portion 42, and the side reflection Light can be reflected from a wide range of the part 42 to a wide range of the side part 32 of the diffusion plate 23, and the side part 32 of the diffusion plate 23 can emit light with uniform brightness. In addition, by adjusting the distance of the space portion 43 between the side portion 27 of the light guide plate 22 and the side reflection portion 42, the amount of light emitted from the side portion 32 of the diffusion plate 23 to the side is adjusted. Can do.

  Note that the light emitting element 36 may be configured such that the light emitting portion 36a protrudes only inward from the incident surface 28 of the light guide plate 22 and does not protrude outward. Even in this case, the light reflected by the side surface reflection part 42 can be diffused and irradiated from the side part 32 of the diffusion plate 23 to the side or upward.

  In each embodiment, the lighting device 10 is not limited to a round shape, and may be configured to be a quadrangle or a polygon.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Lighting equipment
22 Light guide plate
23 Diffuser
27 Side
28 Incident surface
29 Output surface
32 sides
33 Space
36 Light emitting device
36a Light emitter
42 Side reflector as reflector

Claims (4)

An incident surface provided on the side and opposite to the main irradiation direction, and an emission surface provided opposite to the main irradiation direction, and guides light incident from the incident surface to emit light from the emission surface. A light guide plate that emits in the main irradiation direction;
A diffusion plate covering the outside including the side of the light guide plate;
It has a light emitting part that emits light, and light emitted from the light emitting part is incident on the incident surface of the light guide plate, and part of the light emitted from the light emitting unit is incident on the side part of the diffusion plate that covers the side part of the light guide plate A light-emitting element;
An illumination device comprising: The side of the light guide plate is curved from the entrance surface to the exit surface, and the side of the diffusion plate is curved corresponding to the side of the light guide plate. apparatus. The lighting device according to claim 1, wherein a space portion is formed between a side portion of the light guide plate and a side portion of the diffusion plate. A reflection portion disposed opposite to the inner side of at least the side of the light guide plate;
The illuminating device according to any one of claims 1 to 3, wherein a part of the light emitted from the light emitting part is incident on the reflecting part.

Images