TW201435260A - Illumination apparatus - Google Patents

Abstract

This invention provides an illumination apparatus which is able to illuminate a circumference of the illumination apparatus. The illumination apparatus (10) includes a light guide plate (15) and light emitting devices (35). The light guide plate (15) includes a surface portion (25); a rear surface portion (26), which is an opposite side opposite to the surface portion (25); and a groove portion (29), which is disposed at a side of the rear surface portion (26). The light emitting devices (35) are disposed in the groove portion (29) of the light guide plate (15).

Description

Lighting device

An embodiment of the present invention relates to an illumination device using a light guide plate.

Conventionally, there is a ceiling-mounted direct illumination device that increases the uniformity of a surface portion of a light guide plate, that is, a light-emitting surface, by causing light of 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 shape, and a light-emitting element is disposed facing the end surface of the light guide plate. The light-emitting element is mounted on a substrate that is thermally conductively attached to a metal frame that covers and supports a peripheral portion of the light guide plate.

Prior art literature

Patent literature

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

However, the illuminating device using the light guide plate has a light-emitting element disposed opposite to the end surface of the light guide plate, and covers the light-emitting element and the peripheral portion of the light guide plate with the metal frame, thereby emitting light to the illumination space. Only from the surface portion of the light guide plate and only downward, the periphery of the illumination device becomes dark, which tends to cause discomfort.

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 and a light emitting element. The light guide plate includes: a surface portion; a back surface portion opposite to the surface portion; and a groove portion provided on the back surface portion side. The light emitting element is disposed in a groove portion of the light guide plate.

According to the present invention, by arranging the light-emitting elements in the groove portion provided on the side of the back surface portion of the light guide plate, light incident on the light guide plate from the light-emitting element is also emitted from the end surface portion of the light guide plate, and the periphery of the illumination device can be expected Brighten.

10‧‧‧Lighting device

11‧‧‧ Ceiling surface

12‧‧‧Ceiling body

13‧‧‧Adapter

14‧‧‧floor

15‧‧‧Light guide plate

16‧‧‧Lighting unit

17‧‧‧Lighting circuit

20‧‧‧Installing the face

21‧‧‧ Side section

22‧‧‧Adapter guides

25‧‧‧Face

26‧‧‧ Back part

27‧‧‧End face

28‧‧‧Lighting surface

29‧‧‧Slots

30‧‧‧Incoming surface

31‧‧‧Light Guide

32, 44‧‧‧ Diffusion equipment

33‧‧‧Lighting module

34‧‧‧Frame

35‧‧‧Lighting elements

35a‧‧‧Lighting Department

36‧‧‧Substrate

40‧‧‧Reflective equipment

41‧‧‧reflector

47‧‧‧Absorption equipment

A‧‧‧ bright line

FIG. 1 is a cross-sectional view showing a light guide plate of an illumination device according to a first embodiment.

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

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

4(a) and 4(b) are illuminance distribution diagrams showing the light-emitting surface of the light guide plate, and Fig. 4(a) is an illuminance distribution diagram of the light-emitting surface when the reflector is provided, and Fig. 4(b) is non-reflection. The illuminance distribution map of the light-emitting surface in the case of a plate.

Fig. 5 is a cross-sectional view showing a light guide plate of the illumination device according to the third embodiment.

Fig. 6 is a cross-sectional view showing a light guide plate of the illumination device of the fourth embodiment.

Fig. 7 is a cross-sectional view showing a light guide plate of the illumination device of the fifth embodiment.

8 is a cross-sectional view showing a light guide plate of the illumination device of the sixth embodiment.

9 is a cross-sectional view showing a light guide plate of the illumination device of the seventh 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 with a circular or quadrangular shape. The board direct mounting type lighting fixture is attached to a suspended ceiling body 12 provided on the ceiling surface 11 via an adapter 13 .

The illuminating device 10 includes a chassis 14 as an apparatus main body, a light guide plate 15 mounted on a lower surface of the bottom plate 14, a light emitting unit 16 disposed on the light guide plate 15, and a lighting circuit 17 disposed in the bottom plate 14.

The bottom plate 14 is made of, for example, metal, and a mounting surface portion 20 on which the light guide plate 15 is mounted is formed on the lower surface, and the side surface portion 21 is erected from the periphery of the mounting surface portion 20. At the center of the upper surface of the bottom plate 14, an adapter guide 22 attached to the adapter 13 is attached.

As shown in FIG. 1, the light guide plate 15 is formed of a flat material having a high transmittance such as an acrylic resin, and is formed into a circular or quadrangular shape, and includes a surface portion 25 as a main surface, that is, a lower surface. The surface; the back surface portion 26 is an upper surface that is opposite to the surface portion 25; and the end surface portion 27 serves as a side surface. The end surface portion 27 is formed as a curved surface that is curved from the surface portion 25 toward the back surface portion 26. The surface portion 25 and the end surface portion 27 are configured as a light-emitting surface 28 from which light is emitted from the light guide plate 15.

A groove portion 29 in which the light-emitting unit 16 is housed is formed in the vicinity of the peripheral portion of the back surface portion 26 of the light guide plate 15. An incident surface 30 formed substantially perpendicularly to the front surface portion 25 and the back surface portion 26 is formed on the inner surface of the groove portion 29 opposed to the center side of the light guide plate 15. The inner surface of the groove portion 29 opposed to the surface portion 25 is a plane formed parallel to the surface portion 25, and the inner surface of the groove portion 29 opposed to the end surface portion 27 is formed as a curved surface along the end surface portion 27. Further, the groove portion 29 provided on the side of the back surface portion 26 of the light guide plate 15 may be formed in, for example, a quadrangular groove shape regardless of the outer shape (circular shape, quadrangular shape) of the light guide plate 15, and the outer shape of the light guide plate 15 is a circle. In the case of a shape or the like, it may be formed into a circular groove shape in accordance with the outer shape.

The light guide portion 31 connected to the end surface portion 27 of the light guide plate 15 is provided on the surface portion 25 side of the light guide plate 15 from the groove portion 29 of the light guide plate 15.

A diffusing device 32 that diffuses light is provided on the surface portion 25 and the end surface portion 27 of the light guide plate 15. For example, the diffusion device 32 may be configured such that the outer surface of the surface portion 25 and the end surface portion 27 of the light guide plate 15 is subjected to a diffusion treatment, a diffusion sheet is attached, or a diffusion plate is disposed.

A reflection device may also be provided on the back surface portion 26 of the light guide plate 15. For the reflection device, for example, a reflection sheet or a reflection plate may be used, or the attachment surface portion 20 on which the bottom plate 14 on the back side of the light guide plate 15 is mounted may also be used as the reflection device.

In addition, the light-emitting unit 16 includes a light-emitting module 33 and a frame 34 to which the light-emitting module 33 is mounted, and the light-emitting unit 16 is housed along the groove portion 29 of the light guide plate 15 .

The light-emitting module 33 includes a plurality of light-emitting elements 35, and a substrate 36 on which a plurality of light-emitting elements 35 are mounted. The light-emitting element 35 uses, for example, a surface mount type surface mount device (SMD) package type light emitting diode (LED) element. In the surface mount device package, a bare chip of a light emitting diode is disposed in a case and sealed with a sealing resin containing a phosphor, and a surface of the sealing resin is configured as a light emitting portion 35a that emits light. . Further, as the light-emitting element 35, the luminescent color may be the same color, or the luminescent color may be different or the luminescent color may be changed, or another luminescent element such as an electroluminescence (EL) element may be used. Further, the substrate 36 is elongatedly formed so as to be housed in the groove portion 29 of the light guide plate 15, and a plurality of light-emitting elements 35 in one or more rows are arranged in the longitudinal direction of the substrate.

The frame 34 is made of, for example, a metal such as aluminum, and is formed to be elongated so as to be housed in the groove portion 29 of the light guide plate 15, and is attached in a state in which the substrate 36 is thermally connected in the longitudinal direction. The frame 34 is mounted in a state of being thermally connected to the bottom plate 14.

The light emitting unit 16 is: in the groove portion 29 of the light guide plate 15, with the light emitting element 35 The light-emitting portion 35a is disposed to face the incident surface 30 in the groove portion 29. Further, the light-emitting portions 35a of the light-emitting elements 35 disposed in the portions of the opposing groove portions 29 of the light guide plate 15 are opposed to each other.

Further, the power input side of the lighting circuit 17 is connected to the commercial alternating current power source via the adapter 13 and the ceiling body 12, and the lighting output side of the lighting circuit 17 is connected to the plurality of light emitting elements via the substrate 36 of the light emitting module 33. 35. The alternating current power is converted into specific direct current power by the lighting circuit 17, and supplied to the light emitting element 35, whereby the light emitting element 35 is turned on.

Further, when the illumination device 10 is turned on, light emitted from the light-emitting portion 35a of the light-emitting element 35 is mainly incident on the light guide plate 15 from the incident surface 30 of the light guide plate 15, and is reflected in the light guide plate 15 to be incident on the light guide plate 15 The opposite side, and a part of the light that is repeatedly reflected is emitted from the surface portion 25.

Further, the light reflected on the light guide plate 15 and incident on the opposite side of the light guide plate 15 passes through the light guide portion 31 between the groove portion 29 on the opposite side and the surface portion 25, and reaches the end surface portion 27, and is guided from the end surface portion 27. The light board 15 is emitted laterally or upward.

Therefore, the entire light-emitting surface 28 including the surface portion 25 and the end surface portion 27 of the light guide plate 15 emits light with uniform brightness.

By arranging the light-emitting elements 35 in the groove portions 29 provided on the side of the back surface portion 26 of the light guide plate 15, the light incident on the light guide plate 15 from the light-emitting elements 35 can also be emitted from the end surface portion 27 of the light guide plate 15, so that the light can be emitted from the end surface portion 27 of the light guide plate 15 The periphery of the lighting device 10 is brightened. Thereby, the ceiling surface 11 provided with the illuminating device 10 can also be brightened, and the uncomfortable feeling can be reduced.

Further, by providing the light guiding portion 31 connected to the end surface portion 27 of the light guide plate 15 on the side of the surface portion 25 of the light guide plate 15 from the groove portion 29 of the light guide plate 15, light can be guided to the end surface portion 27.

In addition, the light-emitting element 35 is passed through the groove portion 29 of the light guide plate 15 so that The light-emitting portion 35a is disposed so as to face the incident surface 30 facing the center side of the light guide plate 15, and can guide the light to the end surface portion 27 on the other end side.

Further, by forming the end surface portion 27 of the light guide plate 15 as a curved surface, it is possible to increase the amount of light that is emitted upward.

Further, by providing the diffusion device 32 on the outer surface of the front surface portion 25 and the end surface portion 27 of the light guide plate 15, it is possible to reduce the occurrence of luminance unevenness caused by the bright line or the like.

Next, a second embodiment will be described with reference to Figs. 3 and 4 . In addition, the same configurations and effects as those of the first embodiment are denoted by the same reference numerals, and their description will be omitted.

As shown in FIG. 3, the illumination device 10 includes a reflection device 40 that causes light from the light-emitting element 35 to be incident toward the inner surface side of the groove portion 29 opposed to at least the surface portion 25 of the light guide plate 15. Face 30 reflects. The reflection device 40 is a reflection plate 41 that is disposed on the light emission side of the light-emitting element 35, and reflects light emitted from the light-emitting element 35 so as to be totally incident on the incident surface 30 of the light guide plate 15.

In the case of the non-reflecting plate 41, as shown by the dotted arrow in Fig. 3, the light of the light-emitting element 35 is directed from the vicinity of the light-emitting element 35 toward the surface portion 25 of the light guide plate 15, and not in the light guide plate 15 toward the other end side. Light is easily emitted from the surface portion 25 of the light guide plate 15 as a bright line.

When the reflector 41 is provided, as shown by the solid arrows in FIG. 3, all of the light of the light-emitting element 35 is incident on the incident surface 30 of the light guide plate 15, and it is easy to conduct light toward the other end side in the light guide plate 15.

4(a) and 4(b) show, for example, a luminance distribution map of the light-emitting surface when the light guide plate 15 is circular and the groove portion 29 provided in the light guide plate 15 has a quadrangular shape. 4(a) is an illuminance distribution diagram of the light-emitting surface 28 in the case where the reflector 41 is provided, and FIG. 4(b) is an illuminance distribution diagram of the light-emitting surface 28 in the case where the reflector 41 is not provided. As shown in Figure 4 (b), in the absence of a reflector In the case of 41, the bright line A that matches the shape of the groove portion 29 is emitted to the light-emitting surface 28, and thus the uniformity of the light-emitting surface 28 is lowered. On the other hand, as shown in FIG. 4( a ), when the reflector 41 is provided, the bright line is not emitted to the light-emitting surface 28 , so that the uniformity of the light-emitting surface 28 can be improved, and the light guide plate 15 can be oriented toward the other side. The light guided at one end side is increased, and the light emitted from the end surface portion 27 is increased, so that the periphery of the illumination device 10 can be made brighter.

Further, as shown in FIG. 3, the end surface portion 27 of the light guide plate 15 may be a surface that is substantially perpendicular to the front surface portion 25 and the back surface portion 26. In this case, by providing the diffusing device 32 on the end surface portion 27, light can also be emitted upward.

Next, a third embodiment is shown in FIG. In addition, the same configurations and effects as those of the respective embodiments are denoted by the same reference numerals, and their description will be omitted.

The reflection device 40 is disposed on the inner surface of the groove portion 29 that faces the surface portion 25 of the light guide plate 15. As the reflection device 40, for example, a reflection layer coated with a reflective material on the inner surface of the groove portion 29 may be used, or a reflection plate may be disposed.

In this case, in the case of the non-reflecting device 40, as shown by the dotted arrow in FIG. 5, it is also easy to emit from the surface portion 25 of the light guide plate 15 as a bright line.

By having the reflecting device 40, as shown by the solid arrows in FIG. 5, all of the light of the light-emitting element 35 is incident on the incident surface 30 of the light guide plate 15, and it is easy to conduct light in the light guide plate 15 toward the other end side.

Next, a fourth embodiment is shown in Fig. 6 . In addition, the same configurations and effects as those of the respective embodiments are denoted by the same reference numerals, and their description will be omitted.

A diffusion device 44 is provided on the inner surface of the groove portion 29 opposed to the surface portion 25 of the light guide plate 15. As the diffusion device 44, for example, the inner surface of the groove portion 29 may be subjected to blasting treatment, and the inner surface of the groove portion 29 may have surface scattering characteristics, and a diffusion plate may be disposed.

In this case, in the case of the non-diffusion device 44, as shown by the dotted arrow in FIG. 6, it is also easy to emit from the surface portion 25 of the light guide plate 15 as a bright line.

By having the diffusion device 44, as shown by the solid arrows in FIG. 6, the light of the light-emitting element 35 toward the inner surface of the groove portion 29 opposed to the surface portion 25 of the light guide plate 15 is diffused by the diffusion device 44 to be incident on the guide. In the light guide plate 15, light is easily guided in the light guide plate 15. A part of the light incident into the light guide plate 15 by the diffusion device 44 faces the end surface portion 27 located nearby, so that the light emitted from the end surface portion 27 is increased.

Further, when the illumination device 10 is turned on or off, when the surface portion 25 side of the light guide plate 15 is viewed, the presence of the light-emitting element 35 can be reduced by the diffusion device 44.

Next, a fifth embodiment is shown in FIG. In addition, the same configurations and effects as those of the respective embodiments are denoted by the same reference numerals, and their description will be omitted.

The back surface portion 26 of the light guide plate 15 is attached to the bottom plate 14, and the bottom plate 14 is disposed on the back side of the groove portion 29. In a portion facing the bottom plate 14 in the groove portion 29, an absorption device 47 that absorbs light is provided. The absorbing device 47 forms an absorbing layer, for example, by black coating.

In the case of the non-absorptive device 47, as shown by the dotted arrow in Fig. 7, the light emitted from the light-emitting element 35 and reflected on the bottom plate 14 is from the vicinity of the light-emitting element 35 toward the surface portion 25 of the light guide plate 15, without Light is guided inside the light guide plate 15, and is easily emitted from the surface portion 25 of the light guide plate 15 as a bright line.

By having the absorbing device 47, the light toward the light-emitting element 35 of the bottom plate 14 is absorbed by the absorbing device 47 to reduce the amount of reflection, whereby the emission of the bright line from the surface portion 25 of the light guide plate 15 can be reduced.

Further, the reflection device 40, the diffusion device 44, and the absorption device 47 may be used in any combination.

Next, a sixth embodiment is shown in FIG. In addition, the same configurations and effects as those of the respective embodiments are denoted by the same reference numerals, and their description will be omitted.

The groove portion 29 provided on the side of the back surface portion 26 of the light guide plate 15 may have a groove shape in which the outer periphery is open.

Next, a seventh embodiment is shown in FIG. In addition, the same configurations and effects as those of the respective embodiments are denoted by the same reference numerals, and their description will be omitted.

Similarly to the sixth embodiment, when the groove shape of the groove portion 29 provided on the side of the back surface portion 26 of the light guide plate 15 is opened, the surface portion 25 side is more outward than the groove portion 29 side. In a prominent manner, the end face portion 27 is formed as an inclined surface or a curved surface. For example, it is set as an inclined surface inclined by 40 degrees with respect to the light emission direction (direction perpendicular to the surface part 25) from the surface part 25 of the light-guide plate 15.

Thereby, a part of the light that has reached the end surface portion 27 through the light guiding portion 31 is reflected to the surface portion 25 side and emitted, and a part of the light is emitted laterally or upward from the end surface portion 27.

The embodiments of the present invention have been described, but the embodiments are presented as examples and are not intended to limit the scope of the invention. The present 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 and spirit of the invention and are included in the scope of the invention described in the appended claims.

10‧‧‧Lighting device

14‧‧‧floor

15‧‧‧Light guide plate

16‧‧‧Lighting unit

25‧‧‧Face

26‧‧‧ Back part

27‧‧‧End face

28‧‧‧Lighting surface

29‧‧‧Slots

30‧‧‧Incoming surface

31‧‧‧Light Guide

32‧‧‧Diffusion equipment

33‧‧‧Lighting module

34‧‧‧Frame

35‧‧‧Lighting elements

35a‧‧‧Lighting Department

36‧‧‧Substrate

Claims (6)

An illumination device comprising: a surface plate; a back surface portion opposite to the surface portion; and a groove portion provided on one side of the back surface portion; and a light-emitting element In the groove portion of the light guide plate. The illuminating device according to claim 1, wherein the light guide plate is provided on an outer end side of the groove portion of the light guide plate, and an end surface portion of the light guide plate is provided. Further, a light guiding portion connected to the end surface portion of the light guide plate is provided on a side of the surface portion of the light guide plate from the groove portion of the light guide plate. The lighting device of claim 1, wherein the groove portion of the light guide plate is disposed at a peripheral portion of the light guide plate and is opposite to a central side of the light guide plate. The inner surface of the groove portion has an incident surface, and the light-emitting element has a light-emitting portion, and is disposed in the groove portion of the light guide plate so that the light-emitting portion faces the incident direction. The illuminating device according to claim 3, further comprising: a reflecting device that faces the inner surface side of the groove portion facing the surface portion of the light guiding plate from the light emitting element Light is reflected toward the incident surface. The illuminating device according to claim 3, further comprising: a diffusing device that faces the inner surface side of the groove portion facing the surface portion of the light guide plate from the light emitting element Light diffusion. The lighting device of claim 3, further comprising: a bottom plate for mounting the back side of the light guide plate; and an absorbing device for absorbing light from the light-emitting element toward the bottom plate.