JP2013127854A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that has a reduced number of parts.SOLUTION: On the side of an outer circumferential end of a light guide plate 13, there are provided an optical control unit for guiding a portion (light H1) of light H0 incident from a light source 12 toward the back surface of a device body 11, and an inclined surface 22a as a transmissive surface. On the outer circumferential part on the back surface of the device body 11, a transmissive plate 14 as a light transmissive part that emits light from the inclined surface 22a toward the back surface of the device body.

Description

  The present invention relates to a lighting fixture.

In recent years, light-emitting diodes (hereinafter referred to as LEDs) are capable of emitting light with low power and high luminance, and are used as light sources for various electric devices such as displays and lighting equipment.
For example, in the luminaire of Patent Document 1, a light source such as an LED that irradiates light on the front side (downward direction) of the apparatus main body, and a rear surface side (upward direction and mounting surface) of the apparatus main body that has a 180-degree irradiation direction different from this light source. A light source for irradiating light on the side) and irradiating light in the vertical direction. By adopting such a configuration, it is possible to improve not only the human work space but also the brightness of the entire room.

JP 2009-231028 A

By the way, in the illuminating device using a plurality of light sources as described above, when irradiating light in different directions, a light source is provided in each direction, which may increase the number of components.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a lighting apparatus capable of suppressing the number of parts.

  In order to solve the above-described problems, a lighting fixture according to the present invention accommodates a light source, a light guide plate disposed to face the light source and a side surface, the light source and the light guide plate, and is opened to the front side. A lighting fixture that emits light incident on the light guide plate from the front opening of the fixture body to the front side, and is incident on the outer peripheral end of the light guide plate from the light source. The optical control unit that guides a part of the light to the rear surface side of the instrument body, and the light that emits the light from the optical control unit to the rear surface side of the instrument body on the outer peripheral side of the instrument body A transmissive portion is provided.

  In the above-described configuration, the light source is disposed to face the outer peripheral side surface of the light guide plate, and the optical control unit is provided on the front surface side of the outer peripheral end portion side of the light guide plate, and transmits light incident on the light guide plate. It is preferable that the reflective surface reflects a part.

  In the above-described configuration, the light source is disposed to face the outer peripheral side surface of the light guide plate, and the optical control unit is provided on the rear surface side of the outer peripheral end portion side of the light guide plate, and transmits light incident on the light guide plate. A transmissive surface that partially transmits is preferable.

  In the above configuration, the light guide plate has an annular shape with an opening at the center, the light source is disposed to face the inner peripheral side surface of the light guide plate, and the optical control unit is on the outer peripheral end side of the light guide plate. A transmission surface provided on the rear surface side is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting fixture which can suppress a number of parts can be provided.

(A) is a perspective view of the lighting fixture in embodiment, (b) is an exploded perspective view of the lighting fixture of the embodiment. It is sectional drawing of the lighting fixture in the same as the above. (A) is the partial expanded sectional view of the lighting fixture in the same as the above, (b) is the schematic diagram which showed typically the light radiate | emitted from a light source. (A) is a perspective view of the lighting fixture in another example, (b) is an exploded perspective view of the lighting fixture of the other example. It is sectional drawing of the lighting fixture in the same as the above. (A) is the partial expanded sectional view of the lighting fixture in the same as the above, (b) is the schematic diagram which showed typically the light radiate | emitted from a light source. (A) is a perspective view of the lighting fixture in another example, (b) is an exploded perspective view of the lighting fixture of the other example. It is sectional drawing of the lighting fixture in the same as the above. (A) is the partial expanded sectional view of the lighting fixture in the same as the above, (b) is the schematic diagram which showed typically the light radiate | emitted from a light source.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the lighting fixture 10 of this embodiment includes a light source 12 and a light guide plate 13 in the fixture body 11.

  The instrument main body 11 has a hollow bottomed rectangular tube shape inside, has a front opening 11a on the front side thereof, and an attachment portion (not shown) for attaching to a bottom ceiling 11b on the rear side, for example, a ceiling hook ceiling. Have A total of four through-holes 11c penetrating in the front-rear direction are formed on the outer peripheral side of the bottom 11b of the instrument body 11. The through hole 11c is a substantially trapezoidal through hole that becomes narrower toward the center of the bottom 11b. A transmission plate 14 that closes the through hole 11c is attached to the through hole 11c in a shape that follows the shape of the through hole 11c. The transmission plate 14 is made of a transmission member, and a transparent resin material (such as acrylic) or glass is used as the transmission member.

Moreover, the instrument main body 11 is comprised with resin or a metal material, and the said light-guide plate 13 is attached inside the main body 11 so that the said front opening part 11a may be obstruct | occluded.
The light source 12 has a substantially rod shape in which a plurality of LEDs are arranged side by side, and is mounted inside the instrument body 11 so as to face each of the four outer side surfaces 13a of the light guide plate 13 having a substantially square plate shape.

The light guide plate 13 is made of a transmissive member having a substantially square plate shape, and a transparent resin material (such as acrylic) or glass is used as the transmissive member.
The light guide plate 13 includes a first light guide part 21, a second light guide part 22, and a third light guide part 23.

  The first light guide unit 21 includes an outer surface 13a facing the light source 12, and guides light from the light source 12 to the second light guide unit 22 side as light H0. The outer surface 13a, which is the incident surface of the light guide plate 13, is preferably subjected to a process (such as reduction in shape and surface reflection) for increasing the light capturing efficiency.

  The second light guide unit 22 has an inclined surface 22a having a shape that gradually decreases from the thickness L1 of the first light guide unit 21 on the rear surface side of the instrument body 11, and a part from the inclined surface 22a. Light H1 is guided to the through hole 11c side of the main body 11 on the rear surface side, and the remaining light is guided to the third light guide unit 23 side. In the present embodiment, the inclined surface 22a functions as an optical control unit and a transmission surface.

  The third light guide 23 has a thickness L2 that is thinner than the thickness L1 of the first light guide 21, and has a reflective surface 23a that diffuses and reflects light on the rear surface, and an output surface 23b that emits light on the front surface. Is provided. The reflection surface 23a is subjected to processing such as a wedge-shaped prism or a reflection dot using white ink. In addition, the exit surface 23b may be a diffusion sheet that is a separate member or may have an uneven surface as a diffusion treatment.

Next, the effect | action of the lighting fixture 10 of this embodiment is demonstrated.
In the lighting fixture 10 configured as described above, as shown in FIGS. 3 and 4, when the light H <b> 0 is emitted from the light source 12, the light is guided by the light guide plate 13 and mainly the third light guide unit. The light is emitted from the light exit surface 23b of the light 23 to illuminate light mainly on the human work space. A part of the light H <b> 1 is emitted from the inclined surface 22 a of the second light guide unit 22. The light H1 emitted from the inclined surface 22a is emitted to the rear surface side that is the attachment surface side of the instrument 10, and the light is reflected by the inner side surface 11d of the through hole 11c of the instrument body 11 to serve as a light transmission part. Light is emitted to the outside of the instrument 10 through the transmission plate 14. For this reason, only the light source 12 for illuminating the work space located in the front side direction of the luminaire 10 can illuminate not only the human work space but also the mounting surface of the luminaire 10 with the entire room. it can.

Next, characteristic effects of the present embodiment will be described.
(1) An optical control unit that guides part of the light H0 incident from the light source 12 (light H1) to the rear surface side of the instrument body 11 and an inclined surface 22a as a transmission surface are provided on the outer peripheral end side of the light guide plate 13. . And the transmission board 14 as a light transmissive part which discharge | releases the light from the inclined surface 22a to the rear surface side of an instrument main body is provided in the rear surface side outer peripheral part of the instrument main body 11. FIG. With such a configuration, part of the light (light H <b> 1) from the light source 12 is emitted from the inclined surface 22 a of the second light guide unit 22. The light H1 emitted from the inclined surface 22a is emitted to the rear surface side that is the attachment surface side of the instrument 10, and the light is reflected by the inner side surface 11d of the through hole 11c of the instrument body 11 to serve as a light transmission part. Light is emitted to the outside of the instrument 10 through the transmission plate 14. For this reason, it is possible to illuminate not only the human work space but also the entire interior with light by illuminating the mounting surface. Moreover, since it is not necessary to provide the light source 12 with respect to each irradiation direction, an increase in the number of parts can be suppressed.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the LEDs constituting the light source 12 are arranged in a rod shape (straight shape). However, the present invention is not limited to this. For example, a configuration in which the LEDs are arranged in an annular shape is adopted. However, for example, a configuration using a cold cathode fluorescent lamp may be adopted.

  -In above-mentioned embodiment, although the instrument main body 11 was comprised in the bottomed square cylinder shape, it is not restricted to this, For example, as shown to Fig.4 (a) (b), the instrument main body 31 so that it may become a bottomed cylindrical shape. May be configured. Here, in FIGS. 4A and 4B, the light source 32 formed in an annular shape along the inner peripheral surface of the tool main body 31 by forming the tool main body 31 into a substantially bottomed cylindrical shape, and FIG. As shown in (b), a light guide plate 33 is provided which faces the light source 32 and is formed in a disc shape. Similarly, the through hole 31 a is formed to have a curved shape along the outer edge of the instrument body 31. And the permeation | transmission board 34 is made into the curved shape so that this through-hole 31a may be obstruct | occluded.

  Moreover, in the said embodiment, although the inclined surface 22a formed in the rear surface side of the light-guide plate 13 was employ | adopted as an optical control part, as shown in FIG.5 and FIG.6, the 2nd light-guide part 22 of the light-guide plate 33 is used. It is good also as a structure provided with the reflective surface 33a which makes a front surface side an inclined surface and reflects a part of light (light H1) in the light-guide plate 43 to a back surface side. The reflection surface 33a is subjected to a mirror reflection process (metal film deposition, metal foil tape application, etc.). In this configuration, the reflecting surface 33a functions as an optical control unit.

  As described above, even if the reflection surface 33a provided on the front surface side on the outer peripheral end side of the light guide plate 33 and reflecting a part of the light incident on the light guide plate 33 is employed as the optical control unit, the effect of the above embodiment ( The same effect as 1) can be achieved.

  In the above embodiment, the light source 12 is arranged on the outer peripheral side of the instrument main body 11, but is not limited thereto. For example, as shown in FIGS. 8 and 9, a configuration in which the light source 42 is disposed on the center side of the instrument body 11 may be employed.

Here, the structure which has arrange | positioned the light source 42 to the center part side of the instrument main body 11 is demonstrated using FIGS.
In this configuration, the instrument main body 41 is formed to have a substantially bottomed rectangular tube shape as in the above embodiment. The bottom portion 41a, which is the rear surface side of the instrument body 41, includes a first bottom portion 41b on the outer peripheral side and a second bottom portion 41c on the inner peripheral side that projects rearward from the first bottom portion 41b, and these bottom portions 41b and 41c are provided. Is formed so as to be continuous at the connecting portion 41d having a tapered shape. The connecting portion 41d is formed with a through hole 41e penetrating in the front-rear direction. The through hole 41e is formed with a transmission plate 44 as a light transmitting portion following the shape of the through hole 41e. 41 is provided with a light guide plate 43 that follows the shape of the bottom 41 a of the instrument body 41. The light guide plate 43 has an annular shape with an opening at the center thereof, and the light source 42 is provided on the light guide plate 43 so as to face the inner peripheral surface 43a. In the present configuration, the inner peripheral surface 43a is a portion that receives light from the light source 42, similarly to the outer surface 13a of the first light guide portion 21 of the above embodiment. In addition, the light guide plate 43 has an inclined surface 43 b so as to face the transmission plate 44. The inclined surface 43 b is formed so that the thickness decreases toward the outer peripheral direction of the light guide plate 43, and a part of the light from the light source 42 is emitted from the inclined surface 43 b and passes through the transmission plate 44 to the instrument body 41. Released to the outside. In this configuration, the inclined surface 43b functions as an optical control unit and a transmission surface. Even with this configuration, the same effect as the effect (1) of the above embodiment can be obtained.

  In the above-described embodiment and the above-described configuration (another example), the light transmission part is configured by the transmission plates 14, 34, 44. However, the transmission plates 14, 34, 44 are omitted and the through holes 11 c, 31 a, 41 e are transmitted through the light. You may employ | adopt the structure employ | adopted as a permeation | transmission part.

  DESCRIPTION OF SYMBOLS 10 ... Lighting fixture, 11, 31, 41 ... Appliance main body, 11a ... Front opening part, 12, 32, 42 ... Light source, 13, 33, 43 ... Light guide plate, 14, 34, 44 ... Transmission plate (light transmission part) , 22a ... inclined surface (optical control unit and transmission surface), 33a ... reflection surface (optical control unit), 43b ... inclined surface (optical control unit and transmission surface), H0, H1 ... light.

Claims (4)

A light source, a light guide plate disposed so that a side surface of the light source is opposed to the light source, and an instrument body that houses the light source and the light guide plate and has a front opening that is open to the front side,
In the lighting fixture that emits light incident on the light guide plate from the front opening of the fixture body to the front side,
An optical control unit for guiding a part of light incident from the light source to the rear surface side of the instrument body is provided on the outer peripheral end side of the light guide plate, and the optical control unit is provided on the rear surface side outer periphery of the instrument body. The light fixture characterized by having provided the light transmissive part which discharge | releases the light of the said to the rear surface side of the said fixture main body. The lighting fixture according to claim 1,
The light source is disposed to face the outer peripheral side surface of the light guide plate,
The lighting apparatus according to claim 1, wherein the optical control unit is a reflective surface that is provided on a front surface side of the light guide plate on an outer peripheral end portion side and reflects a part of light incident on the light guide plate. The lighting fixture according to claim 1,
The light source is disposed to face the outer peripheral side surface of the light guide plate,
The lighting apparatus according to claim 1, wherein the optical control unit is a transmission surface that is provided on a rear surface side of the outer peripheral end portion side of the light guide plate and transmits a part of light incident on the light guide plate. The lighting fixture according to claim 1,
The light guide plate has an annular shape with an open center,
The light source is disposed to face the inner peripheral side surface of the light guide plate,
The lighting apparatus according to claim 1, wherein the optical control unit is a transmission surface provided on a rear surface side of the outer peripheral end portion side of the light guide plate.