TW201441548A - Lighting apparatus - Google Patents

Abstract

The invention provides a lighting apparatus that can illuminate surroundings. The lighting apparatus includes a light guiding plate, a diffusion plate, and a light emitting element. The light guiding plate includes an incident surface disposed on a side portion and being on a side contrary to a chief lighting direction, and includes an exit surface disposed opposite to the chief lighting direction. The light guiding plate guides a light incident from the light incident surface to exit along the chief lighting direction from the exit surface. The diffusion plate covers an outer side including the side portion of the light guiding plate. The light emitting element includes a light emitting portion which emits a light, such that the light emitted from the light emitting portion incidents to the light incident surface of the light guiding plate, and a portion of light emitted from the light emitting portion incidents to a side portion of the diffusion plate that covers the side portion of the light guiding plate.

Description

Lighting device

Embodiments of the present invention relate to an illumination device using a light guide plate.

Conventionally, there has been an illumination device that obtains uniform surface illumination by causing light from a light-emitting element to enter a light guide plate and emit light from a surface portion of the light guide plate.

The light guide plate is formed in a quadrangular flat plate shape, and a light emitting element is disposed opposite to an end surface of the light guide plate. The light-emitting element is mounted on a substrate that is mounted on an opaque casing that is supported to cover the peripheral portion of the light guide plate.

Background art literature

Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2012-109055

However, the illuminating device using the light guide plate arranges the light-emitting elements opposite to the end faces of the light guide plates, and covers the light-emitting elements and the peripheral portions of the light guide plates by the opaque casing, so that light is not emitted to the illuminating device. Surrounding, the lighting device is dark and uncomfortable.

It is an object of the present invention to provide an illumination device that illuminates the surroundings.

The illumination 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 opposite to the main irradiation direction and an exit surface disposed opposite to the main irradiation direction, and guides light incident from the incident surface to be emitted from the outgoing surface toward the main irradiation direction. The diffusion plate covers the outer side of the light guide plate including the side portions. The light-emitting element has a light-emitting portion that emits light, and the light emitted from the light-emitting portion is incident on the incident surface of the light guide plate, and a part of the light emitted from the light-emitting portion is incident on the side portion of the diffusion plate covering the side portion of the light guide plate.

According to the present invention, by allowing a part of the light from the light-emitting element to enter the side portion of the diffusing plate covering the side portion of the light guide plate, the light can be emitted laterally from the diffusing plate, and it is expected that the periphery of the illuminating device can be illuminated.

10‧‧‧Lighting device

11‧‧‧ Ceiling surface

12‧‧‧ ceiling body

13‧‧‧Connectors

14‧‧‧ apparatus body

15‧‧‧Lighting unit

16‧‧‧Lighting unit

17‧‧‧Installing the face

18‧‧‧ Side section

19‧‧‧Connector Guides

22‧‧‧Light guide plate

23‧‧‧Diffuser

24‧‧‧Lighting module

26‧‧‧Lighting face

27, 32‧‧‧ side

28‧‧‧Injection surface

29‧‧‧Outlet

31‧‧‧Central Facial

33, 43‧‧‧ Space Department

35‧‧‧Substrate

36‧‧‧Lighting elements

36a‧‧‧Lighting Department

40‧‧‧reflector

41‧‧‧Main illumination direction reflector

42‧‧‧Side reflection part as reflection part

Fig. 1 is a cross-sectional view showing a light-emitting unit of the illumination device of the first embodiment.

Fig. 2 is a cross-sectional view of the lighting device.

3 is a cross-sectional view showing a light-emitting unit of the illumination device of the second embodiment.

Next, a first embodiment will be described with reference to Figs. 1 and 2 .

As shown in FIG. 2, the illuminating device 10 is a ceiling direct mounting type luminaire having a circular outer shape, and is attached to a ceiling body 12 provided on the ceiling surface 11 via an adapter 13.

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

Further, the device body 14 is made of, for example, metal, and the lower surface forms a mounting surface portion 17 to which the light emitting unit 15 is attached, and the side surface portion 18 is raised from the periphery of the mounting surface portion 17. An adapter guide 19 attached to the joint 13 is attached to a central portion of the upper surface of the instrument body 14.

In addition, as shown in FIG. 1 (in addition, FIG. 1 is a cross-sectional view, a hatching of a cross-sectional mark is omitted in order to show the alignment of light), and the light-emitting unit 15 is a main irradiation direction of light below, including a light guide plate. 22. A diffuser plate 23 covering the light guide plate 22 and a light emitting module 24 for emitting light.

The light guide plate 22 is formed of, for example, a high-transmittance material such as a transparent acrylic resin having a thickness of about 2 mm to 2.5 mm, and its outer shape is formed into a circular shape when viewed from the lower surface, and a flat-shaped light-emitting surface is formed in the central portion. 26, a side portion 27 is formed in a peripheral region of the light-emitting surface portion 26, and the side portion 27 is a side portion that intersects with the main irradiation direction and is curved toward the upper side opposite to the main irradiation direction. The peripheral end surface of the light guide plate 22 is formed on the side opposite to the main irradiation direction by the curved side portion 27, and is formed as an annular incident surface 28 through which light is incident. The light-emitting surface portion 26 is formed with an exit surface (light-emitting surface) 29 that allows light to be emitted to the lower surface facing the main irradiation direction. In the exit A dot pattern for emitting light guided in the light guide plate 22 is formed on the surface 29. A reflective element such as a reflection sheet or a reflection plate is provided on the back side of the light guide plate 22.

The diffusing plate 23 is, for example, a milky white acrylic resin or a transparent acrylic resin whose inner surface or outer surface is subjected to a milky white diffusion surface treatment, and has light transmissivity and light diffusibility. The diffuser plate 23 is formed in a circular shape when viewed from the lower surface, and covers the entire outer side of the side surface 27 from the light-emitting surface portion 26 of the light guide plate 22, and forms a flat central portion 31 on the central portion 31. The peripheral region forms a side portion 32 that is opposite to the main irradiation direction and that is curved upward. The central surface portion 31 is in contact with the exit surface 29 of the light-emitting surface portion 26 of the light guide plate 22, or is opposed to each other with a slight gap therebetween. Further, the side portion 32 is spaced apart from the side portion 27 of the light guide plate 22, and a gap portion is formed between the side portion 32 and the side portion 27 to be larger than a space portion between the center surface portion 31 and the light emitting surface portion 26 (outer space portion). 33.

Further, the light-emitting module 24 includes a substrate 35 and a plurality of light-emitting elements 36 as 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 as a mounting surface on which the plurality of light-emitting elements 36 are mounted and the wiring pattern is formed.

As the light-emitting element 36, for example, a surface mounted device (SMD) package type light emitting diode (LED) element is used. The SMD package is a package in which an LED bare chip is disposed in a case and sealed by a sealing resin containing a phosphor. The surface of the sealing resin is configured to emit light. Light portion 36a. The plurality of light-emitting elements 36 are arranged in a ring shape 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. The light-emitting element 36 is disposed such that 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 portion of the outer side of the light-emitting portion 36a is smaller than the incident surface 28 of the light guide plate 22 (side) The portion 27) is exposed to the outside and faces the diffusing plate 23 through the space portion 33, and a part of the direct light emitted from the light emitting portion 36a is directly incident on the side portion 32 of the diffusing plate 23. In addition, the plurality of light-emitting elements 36 may use elements having the same illuminating color, and elements having different illuminating colors or elements capable of changing the illuminating color may also be used.

Further, the power input side of the lighting unit 16 is connected to the commercial AC power supply via the joint 13 and the ceiling main body 12, and the load output side is connected to the plurality of light emitting elements 36 via the substrate 35 of the light emitting module 24. Then, the alternating current power is converted into a predetermined direct current power by the lighting unit 16 and supplied to the light emitting element 36, and the light emitting element 36 is turned on.

Further, when the illumination device 10 configured in this manner is turned on, light emitted from the light-emitting portion 36a of the light-emitting element 36 is mainly incident on the light guide plate 22 from the incident surface 28 of the light guide plate 22, and is reflected in the light guide plate 22 The side portion 27 is guided to the light-emitting surface portion 26 and is emitted from the emission surface 29, and is incident on 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 portion 36a of the light-emitting element 36 is directly incident on the side portion 32 of the diffusing plate 23 through the space portion 33, and is diffused and irradiated laterally or upward from the side portion 32 of the diffusing plate 23.

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

In this way, by allowing a part of the direct light from the light-emitting element 36 to directly enter the side portion 32 of the diffusing plate 23 covering the side portion 27 of the light guide plate 22, the light can be emitted from the diffusing plate 23 to the side, and can be illuminated. The periphery of the lighting device 10. Thereby, the ceiling surface 11 of the illuminating device 10 can be illuminate, and the uncomfortable feeling when the illuminating device 10 using the light guide plate 22 is provided can be reduced.

Further, the side portion 27 of the light guide plate 22 is bent from the incident surface 28 over the exit 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, so that even if the thin light guide plate 22 and the thin diffusion are used The plate 23 can also illuminate the light sideways.

Further, since the space portion 33 is formed between the side portion 27 of the light guide plate 22 and the side portion 32 of the diffusion plate 23, light from the light-emitting element 36 can be easily incident into a wide range of the side portion 32 of the diffusion plate 23. The side portion 32 of the diffusion plate 23 can be made to emit light with uniform brightness. Further, by adjusting the distance between the side portion 27 of the light guide plate 22 and the space portion 33 between the side portions 32 of the diffusing plate 23, the amount of light emitted from the side portion 32 of the diffusing plate 23 to the side can be adjusted.

Next, a second embodiment will be shown in FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

A reflector 40 is disposed inside the light guide plate 22. The reflecting plate 40 includes a main irradiation direction reflecting portion 41 opposed to the upper side of the light emitting surface portion 26 of the light guiding plate 22, And a side surface reflection portion 42 as a reflection portion that faces the inner side 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.

The light-emitting element 36 is disposed such that the light-emitting portion 36a protrudes toward the outer side and the inner side of the incident surface 28 of the light guide plate 22, and a part of the direct light emitted from the light-emitting portion 36a in the inward direction directly enters the side surface reflecting portion 42.

Further, the light emitted from the light-emitting portion 36a of the light-emitting element 36 is mainly incident on the light guide plate 22 from the incident surface 28 of the light guide plate 22, and is guided from the side portion 27 to the light-emitting surface portion 26 while being reflected in the light guide plate 22, and is guided. The main irradiation direction reflecting portion 41 of the reflecting plate 40 is reflected toward the emitting surface 29, is emitted from the emitting surface 29, and is incident on the diffusing plate 23, and is diffused and irradiated from the surface of the diffusing plate 23 toward the main irradiation direction.

Further, a part of the direct light emitted from the light-emitting portion 36a of the light-emitting element 36 is directly incident on the side portion 32 of the diffusing plate 23 through the space portion 33, and is diffused and irradiated laterally or upward from the side portion 32 of the diffusing plate 23.

Further, a part of the direct light emitted from the light-emitting portion 36a of the light-emitting element 36 is directly incident on the side surface reflection portion 42 through the space portion 43, and the light reflected by the side surface reflection portion 42 passes through the side portion 27 of the light guide plate 22 from the side portion of the diffusion plate 23. 32 spreads to the side or above.

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

In this way, by causing a part of the direct light from the light-emitting element 36 to be reflected by the side reflection portion 42 and incident on the side portion 32 of the diffusion plate 23, the light can be expanded. The diffuser 23 is emitted laterally to illuminate the periphery of the lighting device 10. Thereby, the ceiling surface 11 of the illuminating device 10 can be illuminate, and the uncomfortable feeling when the illuminating device 10 using the light guide plate 22 is provided can be reduced.

Further, since the space portion 43 is formed between the side portion 27 of the light guide plate 22 and the side surface reflection portion 42, light from the light-emitting element 36 can be easily incident into a wide range of the side reflection portion 42, and light can be made from the side The wide range of the reflecting portion 42 is reflected to a wide range of the side portion 32 of the diffusing plate 23, and the side portion 32 of the diffusing plate 23 can be made to emit light with uniform brightness. Further, by adjusting the distance between the side portion 27 of the light guide plate 22 and the space portion 43 between the side surface reflecting portions 42, the amount of light emitted from the side portion 32 of the diffusing plate 23 to the side can be adjusted.

Further, the light-emitting element 36 can also be configured such that the light-emitting portion 36a protrudes inward only from the incident surface 28 of the light guide plate 22 without protruding outward. In this case, the light reflected by the side reflection portion 42 may be diffused and irradiated laterally or upward from the side portion 32 of the diffusion plate 23.

Further, in each of the embodiments, the illumination device 10 is not limited to a circular shape, and may be configured as a quadrangle or a polygon.

The embodiments of the present invention have been described, but are not intended to limit the scope of the invention. The various embodiments of the invention may be embodied in various other forms, and various omissions, substitutions and changes may be made without departing from the scope of the invention. The invention or its modifications are intended to be included within the scope of the invention and the scope of the invention.

10‧‧‧Lighting device

15‧‧‧Lighting unit

22‧‧‧Light guide plate

23‧‧‧Diffuser

24‧‧‧Lighting module

26‧‧‧Lighting face

27, 32‧‧‧ side

28‧‧‧Injection surface

29‧‧‧Outlet

31‧‧‧Central Facial

33‧‧‧ Space Department

35‧‧‧Substrate

36‧‧‧Lighting elements

36a‧‧‧Lighting Department

Claims (4)

An illumination device comprising: a light guide plate having an incident surface disposed on a side opposite to a main illumination direction and an exit surface disposed opposite to the main illumination direction, and guiding the incident from the incident The light incident on the surface is emitted from the emission surface in the main irradiation direction; the diffusion plate covers the outer side including the side portion of the light guide plate; and the light-emitting element has a light-emitting portion that emits light, so that the light-emitting portion The light emitted from the light emitting portion is incident on the incident surface of the light guide plate and a part of the light emitted from the light emitting portion is incident on a side portion of the diffusing plate covering a side portion of the light guide plate. The illuminating device of claim 1, wherein: the side portion of the light guide plate is bent from the incident surface over the exit surface, and the side portion of the diffuser plate corresponds to The side portion of the light guide plate is curved. The illuminating device according to claim 1, wherein a space portion is formed between the side portion of the light guide plate and the side portion of the diffuser plate. The illuminating device according to any one of the preceding claims, wherein the illuminating device includes: a reflecting portion disposed opposite to an inner side of at least the side portion of the light guide plate, and The light-emitting element causes a part of light emitted from the light-emitting portion to enter the reflection portion.