TWI510743B - Lighting fixture and lighting apparatus - Google Patents

Description

Lighting and lighting equipment

The present invention relates to a light source device, and more particularly to a lighting fixture.

Please refer to FIG. 1 , which is a schematic diagram of a device of a conventional lighting fixture. At present, the lighting fixture 100 is designed to be straight. The lighting fixture 100 generally includes a lampshade 102, a plurality of lamps 106 and a reflective sheet 104. The bulb 106 is disposed within the globe 102. The reflection sheet 104 is also disposed in the lamp cover 102 and disposed on two sides of each of the lamps 106 to reflect the light 108 emitted from the lamp 106 toward the side toward the light exit surface of the illumination lamp 100.

In the conventional lighting fixture 100, the light 108 emitted by the bulb 106 is concentrated by the design of the lampshade. Thereby, the lighting fixture 100 is distributed with light in a Lambertian light field.

However, since the light emitted by the lighting fixture 100 has only one light field distribution, the application of the lighting fixture 100 will be limited. In addition, limited by the concentration of the light field distribution of the lighting fixture 100 and the influence of the lampshade 102, it is impossible to splicing the plurality of lighting fixtures 100 to obtain uniform light output, which also limits the application of the lighting fixture 100.

Please refer to Figure 2, which shows another conventional lighting fixture. Sectional view. The lighting fixture 200 mainly includes a back frame 202, a light guiding element 214, at least one light source 210 and a diffusing plate 220. The back frame 202 mainly includes a bottom plate 204, side plates 206 and a top plate 208. The top plate 208 and the bottom plate 204 are located on opposite sides of the back frame 202. The side panel 206 is joined between the top panel 208 and the outer side of the bottom panel 204. The top plate 208 has an opening 226 for the light to exit from the back frame 202.

The light guiding element 214 is disposed in the back frame 202. Light guiding element 214 There is a reflecting surface 240, a light incident surface 216 and a light exit surface 218. The reflecting surface 240 and the light emitting surface 218 are respectively located on opposite sides of the light guiding element 214. The light incident surface 216 is joined between the reflective surface 240 and the light exit surface 218. Therefore, the light incident surface 216 is adjacent to both the light exit surface 218 and the reflective surface 240. The reflective surface 240 faces the bottom plate 204 of the back frame 202, the light incident surface 216 faces the side plate 206, and the light exit surface 218 faces the opening 226 of the top plate 208. Thus, the aperture 226 exposes the light exit surface 218 of the light guiding element 214. The top plate 208 covers a portion of the outer periphery of the light guiding member 214, that is, the edge 228 of the opening 226 of the top plate 208 is positioned above the light emitting surface 218 of the light guiding member 214.

The light source 210 is also disposed in the back frame 202 and adjacent to the light guide element. The light incident surface 216 of the piece 214. In addition, the light source 210 is surrounded by the bottom plate 204 of the back frame 202, the side plates 206 and the top plate 208, and the light guiding element 214. The light source 210 has a light exit surface 212. The light-emitting surface 212 faces the light-incident surface 216 of the light-guiding element 214. Therefore, the light source 210 can emit light 232 to the light-incident surface 216 of the light-guiding element 214 via the light-emitting surface 212. The illuminating device 200 may include only one light source 210 or may include a plurality of light sources 210 adjacent to the light incident surface 216 of the light guiding element 214.

The diffusion plate 220 is disposed on the top plate 208 of the back frame 202 and covered Covered on the opening 226 of the top plate 208. The extent of the diffuser plate 220 needs to cover the entire opening 226. The diffuser plate 220 has surfaces 222 and 224. The two surfaces 222 and 224 are respectively located on opposite sides of the diffusion plate 220. The surface 222 of the diffuser 220 faces the light exit surface 218 of the light guiding element 214. The diffuser plate 220 can be secured to the top plate 208 of the back frame 202. As shown in FIG. 2, the diffuser plate 220 may extend only over the outer edge of the top plate 208 and the outer edge of the opening 226, but does not completely cover the top plate 208.

In the lighting fixture 200, the light source 210 is via the light exit surface 212 Light 232 is emitted toward the light incident surface 216 of the light guiding element 214. After the light 232 enters the light guiding element 214 via the light incident surface 216 of the light guiding element 214, the light 232 that is incident on the reflecting surface 240 is reflected by the reflecting surface 240 to the light emitting surface 218, and then the light guiding element 214 is emitted through the light emitting surface 218. The light 232 then enters the diffuser 220 via the surface 222, is refracted and diffused by the diffuser 220, and exits the illumination fixture 200 from the surface 224 of the diffuser 220.

Therefore, an aspect of the present invention is to provide a lighting fixture and a lighting device, comprising a light guiding component and a diffusing plate, and a light mixing space between the light guiding component and the diffusing plate, thereby greatly improving the lighting fixture and the lighting The uniformity of the light output of the device.

Another aspect of the present invention provides a lighting fixture capable of achieving a borderless effect of a lighting fixture by designing a light mixing distance between a light guiding member and a diffusing panel and a surface structure of the light guiding member. . because In this way, a plurality of lighting fixtures can be spliced without spacing, and a large illumination device with uniform light output can be obtained, thereby effectively improving the applicability of the lighting fixture.

Yet another aspect of the present invention is to provide a lighting fixture and a photo The device can design the light field distribution of the lighting fixture by designing the surface structure of the light guiding component and the diffusing plate, and the light mixing distance between the light guiding component and the diffusing plate, thereby improving the lighting fixture and the lighting device. Application.

According to the above object of the invention, a lighting fixture is proposed. The lighting fixture comprises a back frame, a light guiding component, at least one light source and a diffusing plate. The back frame includes a top plate and a connecting piece. The top plate has an opening and the attachment member is joined to the top plate. The light guiding component is disposed in the back frame and includes a light incident surface and a light exiting surface. Wherein, the light incident surface is adjacent to the light exit surface, and the opening reveals the light exit surface. The at least one light source is disposed in the back frame and adjacent to the light incident surface. The diffuser plate is disposed on the aforementioned connecting member and completely covers the top plate.

According to an embodiment of the invention, the light guiding element further comprises a reflecting surface opposite to the light emitting surface, and the reflecting surface is provided with a plurality of surface microstructures. In one example, each surface microstructure comprises an arcuate convex structure or a conical convex structure. In another example, each surface microstructure comprises a V-cut strip-like structure that is normal to the vertical entrance face.

According to another embodiment of the present invention, the diffusing plate has a first surface opposite to the second surface, the first surface faces the light emitting surface, and the diffusing plate includes a plurality of surface microstructures. On the first surface or the second surface.

According to still another embodiment of the present invention, the connecting member is obliquely joined to one of the edges of the opening, and an angle between the connecting member and the top plate is less than 90 degrees.

According to the above object of the invention, a lighting device is further proposed. This lighting fixture contains a plurality of lighting fixtures. The luminaires are joined to each other and arranged in a predetermined shape. Each lighting fixture comprises a back frame, a light guiding element, at least one light source and a diffusing plate. The back frame includes a top plate and a connecting piece. The top plate has an opening and the attachment member is joined to the top plate. The light guiding component is disposed in the back frame and includes a light incident surface and a light exiting surface. Wherein, the light incident surface is adjacent to the light exiting surface, and the opening is exposed to expose the light emitting surface. The at least one light source is disposed in the back frame and adjacent to the light incident surface. The diffuser plate is disposed on the connecting member and completely covers the top plate.

According to an embodiment of the invention, the diffusing plates of the adjacent lighting fixtures are joined to each other.

According to another embodiment of the present invention, each of the light guiding elements further includes a reflecting surface opposite to the light emitting surface, and the reflecting surface is provided with a plurality of surface microstructures.

According to still another embodiment of the present invention, each of the diffusing plates has a first surface and a second surface, the first surface faces the light emitting surface, and the diffusing plate includes a plurality of surface microstructures, and the surface microstructures Provided on the first surface or the second surface.

According to still another embodiment of the present invention, in each of the lighting fixtures, the connecting member is obliquely joined to one of the edges of the opening, and an angle between the connecting member and the top plate is less than 90 degrees.

100‧‧‧Lighting fixtures

102‧‧‧shade

104‧‧‧reflector

106‧‧‧Light tube

108‧‧‧Light

200‧‧‧Lighting fixtures

202‧‧‧ Back frame

204‧‧‧floor

206‧‧‧ side panels

208‧‧‧ top board

210‧‧‧Light source

212‧‧‧Glossy surface

214‧‧‧Light guiding elements

216‧‧‧ into the glossy surface

218‧‧‧Glossy

220‧‧‧Diffuser

222‧‧‧ surface

224‧‧‧ surface

226‧‧‧ openings

228‧‧‧ edge

232‧‧‧Light

240‧‧‧reflecting surface

300‧‧‧Lighting fixtures

302‧‧‧ Back frame

304‧‧‧floor

306‧‧‧ side panels

308‧‧‧ top board

310‧‧‧Light source

312‧‧‧Glossy surface

314‧‧‧Light guiding elements

314a‧‧‧Lighting elements

314b‧‧‧Light guiding element

316‧‧‧Into the glossy surface

318‧‧‧Glossy

320‧‧‧Diffuser

322‧‧‧ surface

324‧‧‧ surface

326‧‧‧Opening

328‧‧‧ edge

330‧‧‧ outer edge

332‧‧‧Light

334‧‧‧Links

336‧‧‧Diffuse distance

338a‧‧‧Surface microstructure

338b‧‧‧Surface microstructure

340‧‧‧reflecting surface

342‧‧‧ outer edge

344‧‧‧Opening

346‧‧‧First axial

348‧‧‧second axial

400‧‧‧Lighting equipment

D‧‧‧ Height

W‧‧‧Width

‧‧‧‧ angle

Θ‧‧‧ top angle

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; A cross-sectional view showing another conventional lighting fixture; [Fig. 3] is a cross-sectional view showing a lighting fixture according to an embodiment of the present invention; [Fig. 4A] is a diagram showing implementation according to one embodiment of the present invention. A top view of a lighting device in a manner; [Fig. 4B] is a cross-sectional view showing a lighting device in accordance with an embodiment of the present invention; [Fig. 5A] is a view showing another embodiment of the present invention. A perspective view of a light guiding element; [Fig. 5B] is a light field distribution diagram of a light guiding element according to an embodiment of the present invention; [Fig. 5C] is a view showing another embodiment of the present invention. a light field distribution diagram of the light guiding element; [Fig. 5D] is a light field distribution diagram of a light guiding element according to still another embodiment of the present invention; [Fig. 5E] shows another one according to the present invention. a light guiding element of an embodiment FIG optical field distributions; [Fig. 6A] is a perspective view showing a light guiding member according to still another embodiment of the present invention; [Fig. 6B] is a view showing a light field distribution of a light guiding member according to still another embodiment of the present invention. And [6C] is a light field distribution diagram of a light guiding element according to still another embodiment of the present invention.

Please refer to FIG. 3, which is a cross-sectional view of a lighting fixture in accordance with an embodiment of the present invention. In the present embodiment, the lighting fixture 300 mainly includes a back frame 302, a light guiding element 314, at least one light source 310 and a light transmitting plate. In the present embodiment, the light transmissive plate is a diffusion plate 320. The back frame 302 mainly includes a bottom plate 304, side plates 306 and a top plate 308. The top plate 308 and the bottom plate 304 are located on opposite sides of the back frame 302. The side panel 306 is joined between the top panel 308 and the outer side of the bottom panel 304. The top plate 308 has an opening 326 for the light to exit from the back frame 302. In an embodiment, the material of the back frame 302 may be made of metal to facilitate heat dissipation of the lighting fixture 300.

The light guiding element 314 is disposed in the back frame 302. The light guiding element 314 has a reflecting surface 340, a light incident surface 316 and a light emitting surface 318. The reflecting surface 340 and the light emitting surface 318 are respectively located on opposite sides of the light guiding element 314. The light incident surface 316 is joined between the reflecting surface 340 and the light emitting surface 318, so that the light incident surface 316 is adjacent to both the light emitting surface 318 and the reflecting surface 340. The reflective surface 340 faces the bottom plate 304 of the back frame 302, the light incident surface 316 faces the side plate 306, and the light exit surface 318 faces the opening 326 of the top plate 308. Therefore, the opening 326 exposes the light from the light guiding element 314. Face 318. In one embodiment, the top plate 308 covers the outer periphery of the light guiding element 314, that is, the edge 328 of the opening 326 of the top plate 308 is above the light emitting surface 318 of the light guiding element 314. Depending on the application requirements of the lighting fixture 300, the light directing element 314 can be, for example, a flat plate of uniform thickness, or can be, for example, a wedge shaped plate.

The light source 310 is also disposed in the back frame 302 and adjacent to the light incident surface 316 of the light guiding element 314. In addition, the light source 310 is surrounded by the bottom plate 304 of the back frame 302, the side plates 306 and the top plate 308, and the light guiding element 314. Light source 310 has a light exit surface 312. The light-emitting surface 312 faces the light-incident surface 316 of the light-guiding element 314. Therefore, the light source 310 can emit light 332 toward the light-incident surface 316 of the light-guiding element 314 via the light-emitting surface 312. In an embodiment, the lighting fixture 300 can include only one light source 310. In other embodiments, the lighting fixture 300 can include a plurality of light sources 310 adjacent to the light incident surface 316 of the light guiding element 314. The light source 310 can be, for example, a semiconductor light-emitting element such as a light-emitting diode, a bulb, or a tube-type light source such as a cold cathode lamp.

The diffuser plate 320 is disposed on the top plate 308 of the back frame 302 and covers the opening 326 of the top plate 308. In the present embodiment, the extent of the diffuser plate 320 needs to cover the entire opening 326. The diffuser plate 320 has surfaces 322 and 324. The two surfaces 322 and 324 are respectively located on opposite sides of the diffusion plate 320. The surface 322 of the diffuser 320 faces the light exit surface 318 of the light guiding element 314. The diffuser plate 320 can be secured, for example, to the top plate 308 of the back frame 302.

In another embodiment, the diffuser plate 320 can be the same shape and size as the top plate 308, and the diffuser plate 320 completely covers the top plate 308, that is, the outer edge of the diffuser plate 320 is aligned with the outer edge 330 of the top plate 308. Such as As a result, the lighting fixture 300 has a borderless effect. Therefore, when the plurality of lighting fixtures 300 are spliced into a larger type of lighting device, the diffusing plates 320 of the adjacent lighting fixtures 300 can be joined to each other, and the adjacent diffusing plates 320 are not spaced apart from each other.

In the luminaire 300, the light source 310 emits light 332 toward the light incident surface 316 of the light guiding element 314 via the light exit surface 312. After the light 332 enters the light guiding element 314 via the side light incident surface 316 of the light guiding element 314, the light 332 that is incident on the reflecting surface 340 is reflected by the reflecting surface 340 to the light emitting surface 318, and then the light guiding element 314 is emitted through the light emitting surface 318. The light 332 then enters the diffuser 320 via the surface 322, is refracted and diffused by the diffuser 320, and exits the illumination fixture 300 from the surface 324 of the diffuser 320. Through the guiding and diffusion of the light guiding element 314 and the diffusing plate 320, the light field distribution of the light emitted by the lighting fixture 300 can be more uniform.

In the present embodiment, the back frame 302 of the lighting fixture 300 further includes a connecting member 334 having an opening 344, and the diffusing plate 320 is disposed on the connecting member 334 and covers the opening 344. The opening 326 of the top plate 308 and the opening 344 of the link 334 are at a distance in the first axial direction 346. In this way, the connecting member 334 can separate the light emitting surface 318 of the light guiding element 314 from the diffusing plate 320, and has a light mixing distance 336 between the light emitting surface 318 and the surface 322 of the diffusing plate 320. As shown in FIG. 3, the inner surface of the connector 334 reflects light 332. In some examples, in the second axial direction 348 that is different from the first axial direction 346, the opening 344 of the attachment member 334 has a larger opening size than the opening 326 of the top plate 308, thereby allowing for diffusion. The extent of the plate 320 covers the entire opening 326. In some exemplary examples, the first axial direction 346 and the second axial direction 348 are perpendicular to each other.

In the back frame 302 of the lighting fixture 300, the link 334 is oblique Engaged at the edge 328 of the opening 326 of the top plate 308. Moreover, the angle α between the link 334 and the top plate 308 is less than 90 degrees.

In the lighting fixture 300, by adjusting the link 334 and the top plate The angle α between the 308s provides a desired blending distance 336 between the light exiting surface 318 of the light guiding element 314 and the surface 322 of the diffusing plate 320. In this way, after the light 332 emitted by the light source 310 is guided by the light guiding element 314 and exits the light guiding element 314, the light 340 can be fully mixed with the diffusing plate 320 and then enter the diffusing plate 320. After the diffusion plate 320 is refracted and diffused, the lighting fixture 300 is emitted. Therefore, the light field distribution of the light emitted by the lighting fixture 300 can be more uniform.

In another embodiment, the connecting member 334 is opened toward the top plate 308. The extent of the outer extension of 326 is such that the outer edge 342 of the link 334 is aligned with the outer edge 330 of the top plate 308. Moreover, the extent of the diffuser plate 320 secured to the link 334 fully encompasses the extent of the top plate 308. As a result, the lighting fixture 300 also has a borderless effect. Therefore, when the plurality of lighting fixtures 300 are spliced into a larger type of lighting device, the diffusing plates 320 of the adjacent lighting fixtures 300 can be joined to each other, and the adjacent diffusing plates 320 are not spaced apart from each other.

Please refer to the 4A and 4B drawings, which are respectively drawn according to A top view and a cross-sectional view of a lighting device in accordance with an embodiment of the present invention. In this embodiment, the lighting device 400 includes four lighting fixtures 300. These lighting fixtures 300 are joined to each other and arranged in a desired predetermined shape. As shown in FIG. 4A, the four lighting fixtures 300 are arranged in a rectangular lighting device. 400. In another embodiment, the lighting device 400 may include more than two, for example three, five, etc. lighting fixtures 300, depending on the actual application requirements.

In the lighting device 400, due to the expansion of each lighting fixture 300 The extent of the diffuser 320 completely covers the extent of the top panel 308, and the lighting fixture 300 has a borderless effect. Therefore, as shown in FIG. 4B, the diffusion plates 320 of the adjacent two illumination lamps 300 in the illumination device 400 can be joined to each other, and the adjacent diffusion plates 320 are not spaced apart from each other. In addition, through the guiding and diffusing of the light guiding element 314 and the diffusing plate 320, and the setting of the light mixing distance 336, the light field distribution of the light emitted by the lighting fixture 300 is uniform. Therefore, the lighting device 400 spliced by these lighting fixtures 300 can have a fairly uniform light distribution.

In the present invention, the light guiding element and the diffusion plate can be further designed. The surface structure is used to adjust the light field distribution of the lighting fixture. Please refer to FIG. 5A, which is a perspective view of a light guiding element according to another embodiment of the present invention. In this embodiment, the structure of the light guiding element 314a and the light guiding element 314 are substantially the same, and the difference between the two is mainly that the light guiding element 314a is provided with a plurality of surface microstructures 338a. These surface microstructures 338a are interspersed on the reflective surface 340 of the light guiding element 314a.

In an embodiment, as shown in Figure 5A, these surface microjunctions The structure 338a may comprise an arcuate convex structure, such as a circular arc shaped convex structure. In another embodiment, the surface microstructures 338a can comprise a tapered convex structure, such as a pyramidal convex structure, or a conical convex structure.

Moreover, by varying the structure of these surface microstructures 338a, the light field distribution of the lighting fixture can be adjusted. Please refer to 5A to 5E at the same time. For example, when the ratio of the height D to the width W of the surface microstructure 338a is 1.5%, the light field distribution of the light emitted from the light guiding element 314a is as shown in FIG. 5B; between the height D and the width W of the surface microstructure 338a. When the ratio is 5.0%, the light field distribution of the light emitted from the light guiding element 314a is as shown in FIG. 5C; when the ratio between the height D and the width W of the surface microstructure 338a is 8.5%, the light guiding element 314a emits light. The light field distribution is as shown in Fig. 5D; and when the ratio of the height D to the width W of the surface microstructure 338a is 12.0%, the light field distribution of the light emitted from the light guiding element 314a is as shown in Fig. 5E. The ratio of the height D to the width W of the surface microstructure 338a ranges from 1.5% to 12.0%. As can be seen from Fig. 5B to Fig. 5E, as the ratio of the height D to the width W of the surface microstructure 338a increases, the light field distribution of the light guiding element 314a becomes more concentrated.

Please refer to FIG. 6A, which is a perspective view of a light guiding element according to still another embodiment of the present invention. In the present embodiment, the structure of the light guiding element 314b and the light guiding element 314 are substantially the same, and the difference between the two is mainly that the light guiding element 314b is provided with a plurality of surface microstructures 338b. These surface microstructures 338b are disposed on the reflective surface 340 of the light guiding element 314b.

In an embodiment, as shown in FIG. 6A, the surface microstructures 338b may include a V-shaped grooving strip structure, and the ridge lines of the V-shaped grooving strip structure may be parallel to the light-emitting surface 318 and the light-incident surface 316. Side. Moreover, the strip-like extending direction of the surface microstructures 338b is perpendicular to the normal to the light incident surface 316 of the light guiding element 314b, and can extend through the reflecting surface 340. Moreover, these surface microstructures 338b each have a vertex angle θ.

By varying the structure of these surface microstructures 338b, the light field distribution of the lighting fixture can be adjusted. Please refer to the 6A to 6C drawings at the same time. When the angle θ of the apex angle θ of the microstructure 338b is θ 1 , the light field distribution of the light emitted from the light guiding element 314 b is as shown in FIG. 6B; and when the angle θ of the surface microstructure 338 b is θ 2 , the light guiding element The light field distribution of the light emitted by 314b is as shown in Fig. 6C. Among them, the angle θ 1 is larger than θ 2 . As can be seen from FIGS. 6B and 6C, as the apex angle θ of the surface microstructure 338b increases, the light field distribution of the light guiding element 314b is relatively dispersed.

In still another embodiment of the present invention, please refer to the third The diffusion plate 320 may also include a plurality of surface microstructures (not shown) according to the application requirements of the lighting fixture 300. These surface microstructures can be disposed on surface 322 or surface 324 of diffuser plate 320, or both, on both surfaces 322 and 324, thereby altering the light field distribution of the light exiting illumination fixture 300.

It can be seen from the above embodiments that one of the advantages of the present invention is Because the lighting fixture and the illumination device of the present invention comprise a light guiding component and a diffusing plate, and a light mixing space is arranged between the light guiding component and the diffusing plate, the uniformity of light emission of the lighting fixture and the lighting device can be greatly improved.

It can be seen from the above embodiments that another advantage of the present invention is The lighting fixture of the present invention can achieve the borderless effect of the light emitted by the lighting fixture by designing the light mixing distance between the light guiding element and the diffusing plate and the surface structure of the light guiding element. Therefore, a plurality of lighting fixtures can be spliced without gaps, and a large illumination device with uniform light output can be obtained, thereby effectively improving the applicability of the lighting fixture.

According to the above embodiments, another advantage of the present invention is that the present invention can be designed by designing the surface structure of the light guiding element and the diffusion plate. And the light mixing distance between the light guiding element and the diffusing plate to design the light field distribution of the lighting fixture, thereby improving the applicability of the lighting fixture and the lighting device.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

300‧‧‧Lighting fixtures

302‧‧‧ Back frame

304‧‧‧floor

306‧‧‧ side panels

308‧‧‧ top board

310‧‧‧Light source

312‧‧‧Glossy surface

314‧‧‧Light guiding elements

316‧‧‧Into the glossy surface

318‧‧‧Glossy

320‧‧‧Diffuser

322‧‧‧ surface

324‧‧‧ surface

326‧‧‧Opening

328‧‧‧ edge

330‧‧‧ outer edge

332‧‧‧Light

334‧‧‧Links

336‧‧‧Diffuse distance

340‧‧‧reflecting surface

342‧‧‧ outer edge

344‧‧‧Opening

346‧‧‧First axial

348‧‧‧second axial

‧‧‧‧ angle

Claims (12)

A lighting fixture comprising: a back frame, comprising a top plate, wherein the top plate has an opening; a light guiding element is disposed in the back frame and located inside the opening, the light guiding component comprises a light incident surface and a light-emitting surface, wherein the opening exposes the light-emitting surface; at least one light source is disposed in the back frame and adjacent to the light-incident surface; and a light-transmitting plate is located outside the opening and completely covered The top plate. The lighting fixture of claim 1, wherein the light guiding component further comprises a reflecting surface opposite to the light emitting surface, wherein the reflecting surface is provided with a plurality of surface microstructures. The lighting fixture of claim 2, wherein each of the surface microstructures comprises an arc-shaped convex structure or a tapered convex structure. The lighting fixture of claim 2, wherein each of the surface microstructures is a V-shaped slotted strip structure, and the ridge line of the slotted strip structure is parallel to the light emitting surface and the light incident surface The side of the intersection. The lighting fixture of claim 2, wherein each of the surface microstructures has a height and a width, and the ratio of the height to the width ranges between 1.5% and 12.0%. The lighting fixture of claim 1, wherein the light transmissive plate is a diffusing plate and has a first surface and a second surface, the first surface facing the light emitting surface, and the diffusing plate A plurality of surface microstructures are disposed, and the surface microstructures are disposed on the first surface or the second surface. The lighting fixture of claim 1, wherein the back frame further comprises a connecting member connecting the top plate, the connecting member is obliquely engaged at one edge of the opening, and one of the connecting member and the top plate The angle is less than 90 degrees. A lighting fixture comprising: a back frame comprising a top plate and a connecting member connecting the top plate, wherein the top plate has a first opening, the connecting member has a second opening; a light guiding element is disposed at the The light guide member includes a light incident surface and a light exiting surface, wherein the first opening defines the light emitting surface; at least one light source is disposed in the back frame, and Adjacent to the light incident surface; and a light transmissive plate covering the second opening; Wherein the first opening and the second opening have a distance in a first axial direction, and in a second axial direction different from the first axial direction, the opening size of the second opening An opening size larger than the first opening. The lighting fixture of claim 8 , wherein the light guiding component further comprises a reflecting surface opposite to the light emitting surface, wherein the reflecting surface is provided with a plurality of surface microstructures. The lighting fixture of claim 9, wherein each of the surface microstructures has a height and a width, and the ratio of the height to the width ranges between 1.5% and 12.0%. The lighting fixture of claim 8, wherein the light-transmitting plate is a diffusing plate having a first surface and a second surface, the first surface facing the light-emitting surface, and the diffusing plate comprises a plurality of surface microstructures disposed on the first surface or the second surface. The lighting fixture of claim 8, wherein the first axial direction and the second axial direction are perpendicular to each other.