TW201443369A - LED lamp - Google Patents

Abstract

A dish-like lamp includes a seat, a LED strip, an annular light guide plate, and a positioning cover. The seat has an annular plate and a columnar carrying portion integrally extended from an inner edge of the annular plate. The carrying portion has an annular external surface. The LED strip is fixed on the external surface of the carrying portion to bend in an annular shape. The annular light guide plate has a lateral light input surface having a circular shape and two opposite light output surfaces. The LED strip is disposed at a space surrounded by the annular light guide plate. The LED strip is configured to emit light into the annular light guide plate via the lateral light input surface, and then the light passes out of the annular light guide plate via at least one of the light output surfaces. The positioning cover is fixed on the carrying portion, and the annular light guide plate is clipped between the positioning cover and the annular plate of the seat.

Description

Dish lighting

The present invention relates to a lighting fixture, and more particularly to a dish type lighting fixture.

A conventional dish-shaped lighting fixture (such as the Taiwan Patent No. M407995) includes a square light guide plate and four hard LED strips, and the hard LED strips are respectively disposed around the square light guide plate, thereby The light emitted by the hard LED strip can be incident on the square light guide through the four sides of the square light guide plate, thereby causing the square light guide to emit light for daily illumination.

However, conventional designs have yet to be improved in the presence of absence of, for example, see FIG. 1, which is a conventional disk-shaped light fixture 100 'corner light distribution diagram, dish light fixture 100' of the square guide A plurality of light-emitting diodes 2 ' are disposed beside the adjacent sides of the light plate 1 ' corner. The light-emitting diode 2 'for emitting light to the light guide plate 1 square', the light guide plate 1 is easy to produce a square 'corner uneven distribution of light, i.e., light guide plate 1 by the square' brightness uniformity generated after poor.

Therefore, the present inventors have felt that the above-mentioned deficiencies can be improved, and they have devoted themselves to research and cooperated with the application of the theory, and finally proposed a present invention which is reasonable in design and effective in improving the above-mentioned defects.

The embodiment of the invention provides a dish type lighting fixture, which can improve the brightness uniformity generated by the light passing through the light guide plate, and can effectively improve the related problems caused by the dark zone.

Embodiments of the present invention provide a dish type lighting fixture, including: a lamp holder, An annular plate body and a columnar bearing portion are connected to the inner edge of the annular plate body and have an annular outer ring surface; an LED light bar fixed to the outer ring of the bearing portion The surface of the flexible substrate and the plurality of light-emitting diodes are disposed on the surface of the flexible substrate, and the light-emitting diodes are electrically connected to the flexible substrate. An annular light guide plate having a ring-shaped lateral light-incident surface and two light-emitting surfaces on opposite sides, the LED light strip is disposed inside the annular light guide plate, and the annular light guide plate and the The LED strips are spaced apart from each other, and the light emitting diodes face the lateral light incident surface, so that light emitted by the light emitting diodes can pass through the lateral light incident surface into the annular light guide plate. And extending, by at least one of the two light-emitting surfaces, the annular light guide plate; and a positioning cover fixed to the bearing portion of the lamp holder, and the annular light guide plate is clamped to the lamp holder Between the annular plate body and the positioning cover.

In summary, the dish type lighting fixture provided by the embodiment of the present invention has an annular shape through the LED light bar and the lateral light incident surface of the light guide plate is also annular, so that the light on the LED light bar is two. The polar body can emit light into the light guide plate in a relatively uniform manner; and a light guiding microstructure unit is disposed at the corresponding dark band region through the light guide plate to increase the amount of light emitted by the light guide plate corresponding to the portions of the dark band region; Therefore, the uniformity of brightness that can be exhibited by the light guide plate is better.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

[知知]

100 ' ‧‧‧ dish lighting

1 ' ‧‧‧square light guide

2 ' ‧‧‧Lighting diode

[Embodiment of the Invention]

100‧‧‧disc lighting fixtures

1‧‧‧LED strip

11‧‧‧External light strips

111‧‧‧Soft substrate

112‧‧‧Lighting diode

1121‧‧‧First Light Emitting Diode

1122‧‧‧Second light-emitting diode

113‧‧‧Dark zone

12‧‧‧Inner light strip

121‧‧‧Soft substrate

122‧‧‧Lighting diode

1221‧‧‧First Light Emitting Diode

1222‧‧‧Second light-emitting diode

123‧‧‧Dark zone

13‧‧‧Soft substrate

2‧‧‧Light guide plate

21‧‧‧Circular light guide

211‧‧‧ lateral light entry

212‧‧‧Glossy surface

213‧‧‧Light guiding microstructure unit

214‧‧‧ outer annulus

22‧‧‧Disc light guide

221‧‧‧ lateral glazing

222‧‧‧Glossy

223‧‧‧Light guiding microstructure unit

3‧‧‧ lamp holder

31‧‧‧Circular plate

32‧‧‧Inner body

33‧‧‧Loading Department

331‧‧‧ outer annulus

332‧‧‧Outer end face

3321‧‧‧Opening

4‧‧‧ Positioning cover

41‧‧‧ Cover

42‧‧‧First retaining wall

43‧‧‧Second retaining wall

44‧‧‧Extended ribs

45‧‧‧ hook

5‧‧‧heat block

C‧‧‧Center optical axis

FIG. 1 is a schematic diagram of a corner light distribution of a conventional dish type lighting fixture.

2 is a perspective view of a first embodiment of a dish type lighting fixture of the present invention.

3 is a plan view showing the first embodiment of the dish type lighting fixture of the present invention.

Figure 4 is a partial enlarged view of Figure 3.

Fig. 5 is a cross-sectional view showing the first embodiment of the dish type lighting fixture of the present invention.

Figure 6 is a perspective view of a second embodiment of the dish type lighting fixture of the present invention.

Figure 7 is a plan view showing a second embodiment of the dish type lighting fixture of the present invention.

Figure 8 is a partially enlarged schematic view of Figure 7.

Figure 9 is a cross-sectional view showing a second embodiment of the dish type lighting fixture of the present invention.

Figure 10 is a cross-sectional view showing another aspect of the second embodiment of the dish type lighting fixture of the present invention.

Figure 11 is a perspective view of a third embodiment of the dish type lighting fixture of the present invention.

Figure 12 is an exploded perspective view showing a third embodiment of the dish type lighting fixture of the present invention.

Figure 13 is an exploded perspective view showing another perspective of the third embodiment of the dish type lighting fixture of the present invention.

Figure 14 is a cross-sectional view showing a third embodiment of the dish type lighting fixture of the present invention.

[First Embodiment]

Please refer to FIG. 2 to FIG. 5 , which are the first embodiment of the present invention. It should be noted that the related quantity mentioned in the embodiment corresponds to the embodiment, and is only used to specifically describe the embodiment, so as to facilitate The content is understood and is not intended to limit the scope of the invention.

This embodiment is a dish type lighting fixture 100 having an LED strip 1 and a light guide 2. The dish type lighting fixture 100 of the present embodiment can be applied to various types of lighting fixtures. For example, the disc type lighting fixture 100 of the embodiment can be applied to a ceiling lamp or a chandelier.

However, it should be emphasized that the main features of the present embodiment are the specific configurations of the LED light bar 1 and the light guide plate 2 and the connection and relative relationship therebetween; and the LED light bar 1 and the light guide plate 2 of the present embodiment. How it is installed, this will be explained in the following third embodiment, and therefore this embodiment will not be described in detail. Hereinafter, the specific configurations of the LED light bar 1 and the light guide plate 2 will be separately described, and then the connection and relative relationship between the LED light bar 1 and the light guide plate 2 will be described in a timely manner.

The LED light bar 1 has a flexible substrate 111 and a plurality of light emitting diodes 112. The flexible substrate 111 is a structure that can be bent at will. For example, the flexible substrate 111 can be a Membrane, a Flexible Printed Circuit (FPC), a Flexible Flat Cable (FFC), or Other phase The same function of the flexible flexible substrate.

The flexible substrate 111 is surrounded by an annular shape that is connected end to end, and the light emitting diodes 112 are spaced apart from the surface of the flexible substrate 111. Further, the light emitting diodes 112 are equally spaced. The outer surface of the flexible substrate 111 is mounted in an array and electrically connected to the flexible substrate 111.

The light emitting diode 112 includes a plurality of first light emitting diodes 1121 and a plurality of second light emitting diodes 1122, and the color of the light emitted by the first light emitting diodes 1121 is different from the second light emitting. The color of the light that the diode 1122 can emit, and the number of the first light-emitting diodes 1121 is equal to the number of the second light-emitting diodes 1122. Further, the first light-emitting diodes 1121 and the second light-emitting diodes 1122 are alternately arranged with each other, and the first light-emitting diodes 1121 and the second light-emitting diodes 1122 are alternately arranged. In this embodiment, any first light-emitting diode 1121 is located between any two adjacent second light-emitting diodes 1122, but is not limited thereto. For example, the first LEDs 1121 and the second LEDs 1122 can also be arranged adjacent to each other and arranged alternately with each other. In other words, the first light-emitting diodes 1121 and the second light-emitting diodes 1122 can be alternately arranged in a specific number of units.

In addition, the light-emitting diode 112 of the present embodiment is exemplified by two first light-emitting diodes 1121 and a second light-emitting diode 1122 which can emit different light colors, but in practical applications, the light-emitting diode 112 The types may be the same or have three or more light-emitting diodes capable of emitting different light colors. Moreover, the LED light bar 1 can be electrically connected to an external power source (such as a commercial power socket), so that the power required for the operation of the light-emitting diode 112 on the LED light bar 1 is provided through an external power source.

It should be noted that the LEDs 112 of the LED strip 1 of the present embodiment are used to emit light toward the outside of the flexible substrate 111. Therefore, the LED strip 1 of the embodiment is defined as an external strip. 11. However, for convenience of explanation, the following outer light bar 11 will still be referred to as the LED light bar 1.

The light guide plate 2 has an annular lateral light incident surface 211 and is located on the opposite side. The two light-emitting surfaces 212 and one outer ring surface 214, that is, the light guide plate 2 of the present embodiment is an annular light guide plate 21, the inner edge of which is the lateral light-incident surface 211, and the outer edge of the annular light guide plate 21 The outer ring surface 214 is the upper and lower surfaces of the annular light guide plate 21, that is, the light-emitting surface 212. The radius of the lateral light incident surface 211 of the annular light guide plate 21 is greater than the sum of the outer surface radius of the flexible substrate 111 and the thickness of the single light emitting diode 112. The outer ring surface 214 is exemplified by an annular shape in this embodiment, but is not limited thereto.

The specific configurations of the LED light bar 1 and the light guide plate 2 have been described above. The connection and relative relationship between the LED light bar 1 and the light guide plate 2 will be described below.

The annular light guide plate 21 is disposed at an interval from the LED light bar 1 and substantially on the same plane, and the LED light bar 1 is disposed inside the annular light guide plate 21 . The light-emitting diodes 112 on the LED light bar 1 face the lateral light-incident surface 211, and the distance between each of the light-emitting diodes 112 and the lateral light-incident surface 211 of the annular light-guide plate 21 is equal. In more detail, the thickness of the annular light guide plate 21 (ie, the distance between the two light exiting surfaces 212) is greater than the width of the light emitting diode 112 on the LED strip 1 corresponding thereto, and further, the LED light strip 1 is The region in which the light-emitting diode 112 is projected onto the annular light guide plate 21 is located on the lateral light-incident surface 211 of the annular light guide plate 21. Furthermore, a central optical axis C is defined in the light emitted by each of the light-emitting diodes 112, and the central optical axis C of each of the light-emitting diodes 112 is substantially perpendicular to the lateral direction of the corresponding annular light-guide plate 21. Light into the surface 211. That is, the central optical axis C exhibits a radial distribution centering on the center position of the lateral light incident surface 211.

Thereby, the light-emitting diode 112 on the LED light bar 1 faces the lateral light-incident surface 211, so that the light emitted by the light-emitting diodes 112 can pass through the lateral light-incident surface 211 and enter the ring shape. In the light guide plate 21, at least one of the two light exiting surfaces 212 of the annular light guide plate 21 is continuously passed through the annular light guide plate 21. Since the LED light bar 1 is annularly connected end to end and the lateral light incident surface 211 of the annular light guide plate 21 is also annular, so that the light emitting diode 112 on the LED light bar 1 can be relatively uniform. The light is emitted into the annular light guide plate 21, so that the brightness uniformity of the annular light guide plate 21 can be compared. good. Furthermore, by designing the relative relationship between the LED light bar 1 and the detailed portion of the annular light guide plate 21, the brightness uniformity of the annular light guide plate 21 can be improved.

However, the light emitted by any two adjacent light-emitting diodes 112 forms a dark band region 113, and the dark band regions 113 formed by the light-emitting diodes 112 are located at the inner peripheral edge of the annular light guide plate 21. Therefore, at least one of the two light emitting surfaces 212 of the annular light guide plate 21 is formed with a light guiding microstructure unit 213, and the position of the light guiding microstructure unit 213 corresponds to the dark belt regions 113 to increase the ring shape. The light guide plate 21 corresponds to the amount of light emitted from the portions of the dark band regions 113, thereby further reducing the uniformity of brightness that the annular light guide plate 21 can exhibit due to the dark band region 113.

The specific structure and distribution of the microstructure of the light guiding microstructure unit 213 can be adjusted according to the needs of the designer, and is not limited herein. For example, the microstructure of the light guiding microstructure unit 213 may be convex or grooved.

It should be noted that, since the LED light bar 1 of the present embodiment has an annular shape connected end to end, the dark band region 113 formed by the light emitting diodes 112 occupies an extremely low proportion of the area of the light emitting surface 212 (eg, : less than 5%), therefore, the light-emitting surface 212 can have brightness uniformity that meets the needs of most users without forming the light-guiding microstructure unit 213; similarly, if the design choice can accept the 5% In the dark band, there is no need to additionally process the light guiding microstructure on the lateral light incident surface 211.

[Second embodiment]

Referring to FIG. 6 to FIG. 9 , which is a second embodiment of the present invention, the dish type lighting fixture 100 of the present embodiment also includes an LED light bar 1 and a light guide plate 2 . Further, the LED light bar 1 includes an outer light bar 11 and an inner light bar 12, and the light guide plate 2 includes an annular light guide plate 21 and a disk-shaped light guide plate 22. The specific configuration and connection relationship between the outer light bar 11 and the annular light guide plate 21 have been introduced in the first embodiment, and thus will not be repeated in this embodiment. The following is mainly for the specific structure of the inner light bar 12 and the disc-shaped light guide plate 22 and the connection and relative relationship between the two. A note.

The light bar 12 of the LED light bar 1 has a flexible substrate 121 and a plurality of light emitting diodes 122. The flexible substrate 121 is a structure that can be bent at will. For example, the flexible substrate 121 can be a Membrane, a Flexible Printed Circuit (FPC), a Flexible Flat Cable (FFC), or Other bendable flexible substrates with the same function.

The flexible substrate 121 is formed in an annular shape that is connected end to end, and the light emitting diodes 122 are spaced apart from the surface of the flexible substrate 121. Further, the light emitting diodes 122 are equally spaced. They are arranged on the inner surface of the flexible substrate 121 and electrically connected to the flexible substrate 121. In other words, the LEDs 112 and 122 on the LED strip 1 are respectively located on the inner and outer sides of the LED strip 1 (ie, the outer surface of the flexible substrate 121 of the outer strip 11 and the inner surface of the flexible substrate 121 of the inner strip 12). .

The light emitting diode 122 includes a plurality of first light emitting diodes 1221 and a plurality of second light emitting diodes 1222, and the color of the light emitted by the first light emitting diode 1221 is different from the second light emitting. The color of the light that the diode 1222 can emit, and the number of the first light-emitting diodes 1221 is equal to the number of the second light-emitting diodes 1222. Further, the first LEDs 1221 and the second LEDs 1222 are alternately arranged with each other, and the first LEDs 1221 and the second LEDs 1222 are alternately arranged. In this embodiment, any first light-emitting diode 1221 is located between any two adjacent second light-emitting diodes 1222 as an example, but is not limited thereto. For example, the first LEDs 1221 and the second LEDs 1222 can also be arranged adjacent to each other and arranged alternately with each other. In other words, the first LEDs 1221 and the second LEDs 1222 can be alternately arranged in a specific number of units.

In addition, the light-emitting diode 122 of the present embodiment is exemplified by two first light-emitting diodes 1221 and a second light-emitting diode 1222 that can emit different light colors. However, in practical applications, the light-emitting diode 122 is used. The types can be the same or have three A light-emitting diode that emits different light colors. Moreover, the inner light bar 12 can be electrically connected to an external power source (such as a commercial power socket) to provide power required for the operation of the light-emitting diode 122 on the inner light bar 12 through an external power source.

It should be noted that the light-emitting diode 122 of the inner light bar 12 of the embodiment is used to emit light toward the inner side of the flexible substrate 121. Therefore, the combination of the flexible substrate 121 and the light-emitting diode 122 is defined as The inner light bar 12.

The disc-shaped light guide plate 22 has an annular light-incident surface 221 and two light-emitting surfaces 222 on opposite sides. That is, the outer edge of the disc-shaped light guide plate 22 is a lateral light-incident surface 221 The upper and lower surfaces of the disk-shaped light guide plate 22 are the above-mentioned light-emitting surface 222. The radius of the lateral light incident surface 221 of the disc-shaped light guide plate 22 is smaller than the difference between the inner surface radius of the flexible substrate 121 and the thickness of the single light-emitting diode 122; and the inner light strip 12 is soft. The radius of the outer surface of the substrate 121 is not greater than the radius of the inner surface of the flexible substrate 121 of the outer light bar 11.

The specific configuration of each of the inner light bar 12 and the disc-shaped light guide plate 22 has been described above, and the connection and relative relationship between the inner light bar 12 and the disk-shaped light guide plate 22 will be described below.

The disc-shaped light guide plate 22 is disposed at an interval from the inner light bar 12 and substantially on the same plane, and the disc-shaped light guide plate 22 is disposed inside the inner light bar 12. The light-emitting diodes 122 on the inner light bar 12 face the lateral light-incident surface 221, and the distance between each of the light-emitting diodes 122 and the lateral light-incident surface 221 of the disk-shaped light guide plate 22 is equal. In more detail, the thickness of the disk-shaped light guide plate 22 (ie, the distance between the two light-emitting surfaces 222) is greater than the width of the light-emitting diode 122 on the inner light bar 12 corresponding thereto. Further, the inner light bar 12 The area in which the upper light-emitting diode 122 is projected onto the disk-shaped light guide plate 22 is located on the lateral light-incident surface 221 of the disk-shaped light guide plate 22. Furthermore, a central optical axis C is defined in the light emitted by each of the light-emitting diodes 122, and the central optical axis C of each of the light-emitting diodes 122 is substantially perpendicular to the side of the corresponding disk-shaped light guide plate 22. To the light surface 221. That is, the distribution of the central optical axis C is directed toward the center of the disk in the radial direction of the disk-shaped light guide plate 22.

Thereby, the light-emitting diodes 122 on the inner light bar 12 face the lateral light-incident surface 221, so that the light emitted by the light-emitting diodes 122 can pass through the lateral light-incident surface 221 into the disk. In the light guide plate 22, at least one of the two light exit surfaces 222 of the disk-shaped light guide plate 22 is continuously passed through the disk-shaped light guide plate 22. Since the inner light bar 12 is annularly connected end to end and the lateral light incident surface 221 of the disk light guide plate 22 is also annular, so that the light emitting diode 122 on the inner light bar 12 can be relatively uniform. The light is emitted into the disk-shaped light guide plate 22, so that the brightness uniformity of the disk-shaped light guide plate 22 is better. Moreover, the design of the relative relationship between the inner light bar 12 and the disc-shaped light guide plate 22 helps to enhance the uniformity of brightness exhibited by the disk-shaped light guide plate 22.

However, the light emitted by any two adjacent light-emitting diodes 122 on the inner light bar 12 forms a dark band region 123, and the dark band region 123 formed by the light-emitting diodes 122 is located on the disk-shaped guide. The outer peripheral edge portion of the light plate 22. Therefore, at least one of the two light emitting surfaces 222 of the disc-shaped light guide plate 22 is formed with a light guiding microstructure unit 223, and the position of the light guiding microstructure unit 223 corresponds to the dark belt regions 123 to increase the circle. The disc-shaped light guide plate 22 corresponds to the amount of light emitted from the portions of the dark strip regions 123, thereby further reducing the uniformity of brightness that the disc-shaped light guide plate 22 can exhibit due to the dark strip region 123.

The specific structure and distribution of the microstructure of the light guiding microstructure unit 223 can be adjusted according to the needs of the designer, and is not limited herein. For example, the microstructure of the light guiding microstructure unit 223 may be convex or grooved.

In general, the dish type lighting fixture 100 of the present embodiment has the inner light bar 12 and the disc-shaped light guide plate 22 disposed on the inner side of the outer light bar 11, that is, the LED light bar 1 is disposed on the annular light guide plate. 21 is between the disc-shaped light guide plate 22. The inner light bar 12, the disk-shaped light guide plate 22, the outer light bar 11, and the annular light guide plate 21 are substantially coplanar, but the practical application is not limited thereto.

In addition, the LED light bar 1 described in this embodiment can also have other changes. As shown in FIG. 10, the LED light bar 1 can use only one flexible substrate 13. The light-emitting diodes 112 and 122 are respectively mounted on opposite surfaces of the flexible substrate 13 (that is, the outer surface and the inner surface of the flexible substrate 13).

[Third embodiment]

Referring to FIG. 11 to FIG. 14 , which is a third embodiment of the present invention, the present embodiment is an actual application aspect of the LED light bar 1 and the light guide plate 2 according to the first embodiment. Specifically, the dish type lighting fixture 100 provided in this embodiment includes the LED light bar 1 (ie, the outer light bar 11) of the first embodiment, and the light guide plate 2 of the first embodiment (ie, the annular light guide plate). 21), a lamp holder 3, a positioning cover 4, and a fin-shaped heat dissipation block 5.

The specific configuration and connection relationship between the outer light bar 11 and the annular light guide plate 21 have been described in the first embodiment, and thus will not be described again in this embodiment. The specific configuration of the lamp holder 3, the positioning cover 4, and the fin-shaped heat dissipating block 5 and their connection and relative relationship with the outer light bar 11 and the annular light guide plate 21 will be mainly described below.

The lamp holder 3 has an integral structure and has an annular plate body 31, an inner plate body 32, and a columnar bearing portion 33. The inner plate body 32 is substantially located inside the annular plate body 31, and the bearing The portion 33 has a substantially annular cross section and the bearing portion 33 is connected to the inner end edge of the annular plate body 31 and the outer end edge of the inner plate body 32. The bearing portion 33 has an annular outer ring surface 331 and an outer end surface 332. In this embodiment, the outer ring surface 331 is perpendicularly connected between the inner end edge of the annular plate body 31 and the outer end surface 332. That is, the outer end surface 332 of the bearing portion 33 has a height difference from the annular plate body 31. The outer end surface 332 of the bearing portion 33 is provided with a plurality of openings 3321 arranged at equal intervals, and each opening 3321 is substantially L-shaped.

The positioning cover 4 has a circular cover 41, an annular first retaining wall 42, an annular second retaining wall 43, and an annular extending rib 44. The first retaining wall 42 The second retaining wall 43 and the extending ribs 44 are respectively formed by protrudingly extending from the inner surface of the cover plate 41 and are sequentially arranged from the inside to the outside. In other words, the order of the radii from large to small is: the extending rib 44, the second retaining wall 43, and the first retaining wall 42.

Furthermore, the cross-sectional profile between the first retaining wall 42 and the second retaining wall 43 is slightly larger than the contour of the outer end surface 332 of the bearing portion 33, so that the end block of the bearing portion 33 can be fitted to the first portion. A retaining wall 42 is disposed between the retaining wall 42 and the second retaining wall 43. A plurality of hooks 45 are formed on the inner surface of the cover 41 between the first retaining wall 42 and the second retaining wall 43. The positions and the numbers of the hooks 45 respectively correspond to the outer end faces 332 of the bearing portions 33. Opening 3321.

The flexible substrate 111 of the outer light bar 11 is fixed to the outer ring surface 331 of the bearing portion 33 in an annular shape that is connected end to end, and the annular light guide plate 21 is disposed on the outer side of the outer light bar 11. . The positioning cover 4 is rotatably fixed to the carrying portion 33 through the opening 3531 through the hook 45, thereby maintaining the relative position of the positioning cover 4 and the carrying portion 33. The end block of the bearing portion 33 is fitted between the first retaining wall 42 and the second retaining wall 43. The second retaining wall 43 does not shield the light emitting diode 112 of the outer light bar 11 and the annular light guide plate. 21 is sandwiched between the annular plate body 31 of the socket 3 and the extending ribs 44 of the positioning cover 4. Furthermore, the fin-shaped heat dissipation block 5 is mounted on the inner plate body 32 of the socket 3, and the fin-shaped heat dissipation block 5 and the annular light guide plate 21 are located on opposite sides of the socket 3 (eg, the upper side shown in FIG. 14). With the underside).

Further, the radii of the above components are ranked from the largest to the smallest: the outer annular surface 214 of the annular light guide plate 21, the extended rib 44 of the positioning cover 4, the lateral light incident surface 211 of the annular light guide plate 21, and the circle. The outer outer light strip 11 and the outer annular surface 331 of the bearing portion 33. Wherein, if the annular light guide plate 21 is realized by using polymethyl methacrylate (PMMA) or plastic (PC), the radius may be much larger than the lamp holder 3 because of its light weight; for example, if the lamp holder 3 is selected The metal is realized, and the overall radius of the socket 3 can be designed to be about 33% of the radius of the outer annular surface 214 of the annular light guide plate 21. It is to be noted that, since the annular plate body 31 and the carrying portion 33 respectively form the upper receiving wall and the side receiving wall of the annular light guiding plate 21, the positioning cover 4 forms a lower receiving wall after the engaging portion 33 is fastened. Therefore, the radius of the outer annular surface 331 of the bearing portion 33 can be designed to be no more than 66% of the radius of the positioning cover 4, so as to carry the annular light guide plate 21 by using at least half of the total area of the positioning cover 4; that is, the square of the radius is reduced. Go to the square of the 66% radius, multiply by the pi, still greater than 50% of the total surface product. The relative relationship between the outer light bar 11 and the annular light guide plate 21 is as described in the first embodiment, and will not be repeated here.

In more detail, the flexible substrate material 111 of the outer light bar 11 is preferably copper, so that when the outer light bar 11 is in use, the light emitting diode 112 can transmit the thermal energy to the soft substrate 111 made of copper. The bearing portion 33 and the fin-shaped heat dissipating block 5 achieve the effect of rapid heat dissipation, thereby keeping the LED 112 at a preferred operating temperature without affecting the brightness thereof.

Furthermore, the flexible substrate 111 made of copper can have better flexibility. In the present embodiment, the total length of the outer strip 11 is preferably 80 mm or more, so that the outer strip 11 has sufficient The flexibility is suitable for an annular shape that is connected around the head and tail. In other words, if the total length of the outer light bar 11 is less than 80 mm, when the outer light bar 11 is surrounded by an annular shape that is in contact with the head and the tail, the flexible substrate 111 is liable to be broken due to insufficient flexibility.

[Possible effects of embodiments of the present invention]

The dish type illumination lamp provided by the embodiment of the invention has an annular shape through the LED light bar and the lateral light incident surface of the light guide plate is also annular, so that the light emitting diode on the LED light bar can be more uniform. The way of emitting light into the light guide plate makes the brightness uniformity of the light guide plate better.

Furthermore, the LED light bar is annular and the lateral light incident surface of the light guide plate is also annular, so that the dark band area corresponds to the proportion of the light guide plate is extremely low, so that the light guide plate can be used without additional The light guiding microstructure is formed, thereby achieving the effect of reducing cost. In another aspect, the light guide plate can also be provided with a light guiding microstructure unit at the corresponding dark band region, thereby increasing the amount of light emitted by the light guide plate corresponding to the portions of the dark band region, thereby reducing the ground and even avoiding the light guide plate. The dark band area causes the brightness uniformity that it can exhibit to deteriorate.

Furthermore, since the bearing portion provides an annular outer ring surface, the overall appearance is cylindrical, and the outer column wall is fitted with the LED light bar, and the design of the hollow circular light side inside the light guide plate is adopted to solve the darkness. With a problem; and the column-shaped bearing portion is connected with fins The heat block can be hollowed out to form a chimney effect, which improves the heat dissipation capacity and solves the problem of light decay.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent variations and modifications of the scope of the invention are intended to be within the scope of the invention.

100‧‧‧disc lighting fixtures

1‧‧‧LED strip

11‧‧‧External light strips

111‧‧‧Soft substrate

112‧‧‧Lighting diode

1121‧‧‧First Light Emitting Diode

1122‧‧‧Second light-emitting diode

2‧‧‧Light guide plate

21‧‧‧Circular light guide

212‧‧‧Glossy surface

214‧‧‧ outer annulus

Claims (10)

A dish type lighting fixture, comprising: a lamp holder having an annular plate body and a columnar bearing portion, the bearing portion being connected to an inner edge of the annular plate body and having an annular outer ring surface; An LED light strip is fixed on the outer ring surface of the bearing portion and has a flexible substrate surrounding the annular shape and a plurality of light emitting diodes. The light emitting diodes are spacedly mounted on the surface of the flexible substrate. And the light-emitting diodes are electrically connected to the flexible substrate; the annular light-guiding plate has a ring-shaped lateral light-incident surface and two light-emitting surfaces on opposite sides, and the LED light bar is disposed on the An inner side of the annular light guide plate, and the annular light guide plate is spaced apart from the LED light bar, the light emitting diodes face the lateral light incident surface, so that the light emitted by the light emitting diodes can pass through the light emitting diode a lateral light incident surface penetrates into the annular light guide plate, and continues to pass through the annular light guide plate from at least one of the two light exit surfaces; and a positioning cover fixed to the bearing portion of the lamp holder And the annular light guide plate is clamped between the annular plate body of the lamp holder and the positioning cover. The dish-type lighting fixture of claim 1, wherein the light emitted by any two adjacent light-emitting diodes forms a dark zone, and the dark zone formed by the light-emitting diodes is located An inner peripheral portion of the light guide plate, at least one of the two light emitting surfaces is formed with a light guiding microstructure unit, and the position of the light guiding microstructure unit corresponds to the dark band regions to increase the light guiding plate corresponding to the light guiding plate The amount of light emitted from the dark zone. The dish type lighting fixture of claim 2, wherein the light emitting diodes are mounted on the outer surface of the flexible substrate in an equidistant annular arrangement, and each of the light emitting diodes and the ring The distances of the lateral light incident surfaces of the light guide plates are all equal. The dish type lighting fixture of claim 3, wherein a light axis emitted by each of the light emitting diodes defines a central optical axis, and a central optical axis of each of the light emitting diodes is substantially perpendicular to the light axis thereof. The lateral light-incident surface of the corresponding annular light guide plate. The dish type lighting fixture of claim 1, wherein the light emitting diodes comprise a plurality of first light emitting diodes and a plurality of second light emitting diodes, and the first light emitting diodes The color of the light that can be emitted is different from the color of the light emitted by the second light-emitting diodes, and the number of the first light-emitting diodes is equal to the number of the second light-emitting diodes. The dish type lighting fixture of claim 5, wherein the first light emitting diodes and the second light emitting diodes are alternately arranged with each other, and any of the first light emitting diodes is located Between two adjacent second light-emitting diodes. The disc-type lighting fixture of any one of the preceding claims, wherein the positioning cover has a cover, a first retaining wall, and a second retaining wall, the first retaining wall being located An inner side of the second retaining wall is partially engaged between the first retaining wall and the second retaining wall. The disc-type lighting fixture of any one of the preceding claims, wherein the carrying portion is formed with a plurality of openings, and the positioning cover is formed with a plurality of hooks corresponding to the openings, The positioning cover is respectively engaged with the opening of the bearing portion through the hooks to maintain the relative position of the positioning cover and the bearing portion. The dish type lighting fixture of any one of the preceding claims, wherein the lamp holder has an inner plate body, the inner plate body is located substantially inside the annular plate body, and the bearing portion is The heat-dissipating block is mounted on the inner plate body of the lamp socket, and the heat-dissipating block is mounted on the inner plate body of the lamp socket. The heat-dissipating block is mounted on the inner plate body of the lamp socket. And the heat sink block and the annular light guide plate are located opposite to the lamp holder side. The dish type lighting fixture of any one of claims 1 to 6, wherein the outer ring surface radius of the bearing portion is 66% of the radius of the positioning cover.