CN110242936B

CN110242936B - Light guide assembly and lighting device using same

Info

Publication number: CN110242936B
Application number: CN201810192604.9A
Authority: CN
Inventors: 陈辉; 立野洋司
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2018-03-09
Filing date: 2018-03-09
Publication date: 2022-02-25
Anticipated expiration: 2038-03-09
Also published as: CN110242936A

Abstract

The invention relates to the field of lamp illumination, and discloses a light guide assembly and an illumination device using the same, wherein the light guide assembly comprises a light guide plate, a light source and a light source, wherein the light guide plate is provided with a light incident surface and a light emergent surface; the LED chips are arranged along the edge of the light guide plate and correspond to the light incident surface at specified intervals; the opening is formed along the same side edge of the light guide plate corresponding to the LED chips and penetrates through the light guide plate, the light emitting surface comprises a first light emitting surface and a second light emitting surface which are parallel to each other, the first light emitting surface and the light incident surface are vertical to each other, and the second light emitting surface and the light incident surface are vertical to each other; the first light-emitting surface comprises a light-emitting area and a light-mixing area; the light emitting area of the first light emitting surface is provided with optical points which partially reflect the light emitted by the LED chip into the light guide plate to the first light emitting surface and the second light emitting surface; the light mixing area is provided with a smooth surface and is arranged along the edge of the light guide plate; the opening corresponds to the opening of the first light emitting surface and is arranged in the light mixing area. The invention can effectively eliminate the shadow generated by the holes on the light guide plate, so that the light is uniform and comfortable.

Description

Light guide assembly and lighting device using same

Technical Field

The invention relates to the field of lamp illumination, in particular to a light guide assembly and an illumination device using the same.

Background

The light guide plate is used for converting a line light source originally consisting of LED particle point light sources into a surface light source, is an important component in a backlight lamp, is a mainstream at present, and has the biggest advantages of thin thickness, light weight and low cost. However, since the light of the side light-entering light guide plate enters the light guide plate from the edge, the installation and fixation assembly of the lamp and other functional matching devices generate shadows, which affects the appearance and the light-emitting comfort.

To solve this problem, patent document CN201010003969.6 discloses a light guide plate, a backlight module and a method for guiding light. Its light guide plate includes: "a bottom surface, a light exit surface opposite to the bottom surface, and a light entrance surface connecting the bottom surface and the light exit surface, and a light entering the light entrance surface to conduct the light guide plate in the light guide plate further includes: a transparent substrate having at least one through hole and a first trench; the first groove is arranged on the light-transmitting substrate and around the through hole, namely, the groove is arranged around the through hole of the light guide plate, so that light entering the light guide plate is refracted between the through hole and the groove, and further, light is emitted from the upper direction and the lower direction around the through hole. Although the shadow problem can be partially solved to this light guide plate structure, it has increased the course of working, has increased the processing degree of difficulty, and this structure has influenced the intensity around the through-hole, lacks the practicality of using in production.

Patent document CN200810306481.3 discloses a method and an apparatus for eliminating the shadow cast by a light guide assembly. The proposal is that the light guide component comprises a light incident surface and a light emergent surface intersected with the light incident surface; at least one light source body, which is arranged at the side part between the light guide component and the light incident surface, so that at least partial light generated by the light source body can be projected to the surface side of the light emergent surface. By changing the relative position relationship between the light source and the light guide assembly, part of the light rays are directly projected on the light-emitting surface, so that the light rays can be refracted into the light guide assembly at the light-emitting surface at the rear periphery where the hole site originally generates the shadow, and the shadow originally generated at the rear periphery of the hole site can be effectively eliminated. The device can solve the shadow problem to a certain extent, but is limited by the relative position relation of the light source and the light guide assembly, thereby leading the volume of the light guide assembly to be enlarged and limiting various utilization modes of the light guide plate.

Disclosure of Invention

In view of the deficiencies of the prior art, the present invention provides a light guide assembly comprising: the light guide plate is provided with a light incident surface and a light emergent surface; an LED chip mounting portion provided in such a manner that a plurality of LED chips mounted thereon face the light incident surface; and the hole is formed along the edge of the same side, corresponding to the LED chips, of the light guide plate and penetrates through the light guide plate. The light emitting surface comprises a first light emitting surface and a second light emitting surface which are parallel to each other, the first light emitting surface and the light incident surface are vertical to each other, and the second light emitting surface and the light incident surface are vertical to each other; the first light-emitting surface comprises a light-emitting area and a light-mixing area; the light emitting area of the first light emitting surface is provided with optical points which partially reflect the light emitted by the LED chip into the light guide plate to the first light emitting surface and the second light emitting surface; the light mixing area is provided with a smooth surface and is arranged along the edge of the light guide plate; the opening corresponds to the opening of the first light emitting surface and is arranged in the light mixing area.

In the invention, the light emitted by the LED chip enters the light guide plate through the light incident surface of the light guide plate, wherein a part of the light enters the optical point of the first light emitting surface perpendicular to the light incident surface of the light guide plate, when the light enters the optical point, the light changes the reflection angle thereof, i.e., the total reflection phenomenon of the light transmission is destroyed, the light is reflected and scattered and irradiates to different directions, wherein a part of the light is emitted from the second light emitting surface arranged in parallel with the first light emitting surface, of course, a part of the light from the LED chip is emitted to the second light emitting surface of the light guide plate and then reflected to the optical point of the first light emitting surface of the light guide plate, and the change of the reflection angle is completed, so that a part of the light is emitted from the second light emitting surface of the light guide plate.

In the invention, in the light mixing area without the optical point, because the total reflection phenomenon is destroyed by the absence of the optical point, no light can be emitted from the corresponding part of the light mixing area. Under the condition of setting up the trompil in mixing light zone, can make the light that gets into the light guide plate from the income plain noodles of light guide plate side, when sheltering from the production shadow by the trompil, this shadow falls in the mixing light zone that does not have light to jet out, so can not observed by user's naked eye to the pleasing to the eye degree of leaded light subassembly has been improved.

Preferably, the LED chip mounting portion is provided with a first LED chip group arranged corresponding to the opening, and a second LED chip group arranged not corresponding to the opening, wherein the arrangement density of the LEDs in the unit area of the first LED chip group is greater than that of the LEDs in the unit area of the second LED chip group.

The LED chip arranges that the luminous area of light source is more intensive more just bigger for the light that the LED chip sent is more close to the line source, can utilize the light that the LED chip sent each other and shine the half shadow that the trompil produced and eliminate this shadow, thereby make the shadow this shadow that the trompil produced of light irradiation reduce, and the degree weakens, makes it can not observed by the user, improves leaded light subassembly's pleasing to the eye degree.

Preferably, the distance between the LED chips arranged in parallel along the edge of the light guide plate in the first LED chip group is smaller than the distance between the LED chips arranged in parallel along the edge of the light guide plate in the second LED chip group.

The smaller the distance between the point light sources, the higher the density, the easier the line light sources are formed, so that the light rays and the penumbra generated by the LED chips are easy to weaken the shadow formed by the opening. And meanwhile, the LED chip groups are uniformly distributed, so that the light emitting is more uniform and comfortable.

Preferably, the distance between the LED chip in the first LED chip group and the light guide plate is different from the distance between the LED chip in the second LED chip group and the light guide plate.

Through the distance of adjustment local LED chip and light guide plate for the LED chip in the first LED chipset corresponding to the trompil compares with the LED chip in the second LED chipset, keeps away from the income plain noodles more, thereby can make trompil shadow degree weaken make the trompil shadow difficult for observing, has further improved light guide assembly's pleasing to the eye degree.

Preferably, the pattern formed by the optical dots at the boundary edge between the light mixing region and the light emitting region is a predetermined pattern, and the shadow of the opening generated by the LED chip irradiation opening falls within the light mixing region side of the predetermined pattern.

The pattern formed by the optical points at the boundary edge of the light mixing area and the light emitting area is set as the specified pattern, so that the original shadow of the opening generated by the LED chip irradiating the opening falls in the light mixing area formed by the specified pattern, the original shadow of the opening cannot be observed by naked eyes of a user through the light mixing area without emitting light, and therefore the shadow can be effectively eliminated. Meanwhile, the specified pattern can also properly reduce the area proportion of the light mixing area to the whole light guide surface, and ensure the area of a luminous area, thereby enhancing the light emitting brightness of the light guide assembly.

Preferably, the pattern formed by the optical points at the boundary edge of the light mixing region and the light emitting region comprises at least one of a petal shape, a semicircular shape, a tree shape, a regular geometric figure, a lucky cloud shape and a three-dimensional 3D figure.

The specified patterns are matched with the opening shadows, so that the opening shadows fall in the non-luminous light mixing area to be invisible, the area proportion of the light emitting area is ensured, the light emitting brightness is increased, and meanwhile, the attractive effect is increased through the patterns.

Preferably, in the light emitting region, the optical dot density of the opening adjacent portion near the opening is greater than that of the other portion.

The optical point density is locally increased, particularly the optical point density of the opening adjacent part close to the opening is increased, so that light rays can be reflected for multiple times at the opening adjacent part, and the light-emitting brightness of the area is enhanced, so that the aim of weakening the opening shadow is fulfilled.

Preferably, the opening vicinity portion near the opening is located on a side of the opening opposite to the LED chip.

The opening adjacent part is arranged on the side, opposite to the LED chip, of the opening, namely the side where the shadow is generated, the area is locally increased, particularly the optical point density of the opening adjacent part, where the opening shadow falls, is capable of enhancing the brightness of the area in a more targeted mode, so that the opening shadow is eliminated, and meanwhile, the light emission is more uniform.

Preferably, the LED chip mounting part is a PCB.

The PCB can conveniently arrange and combine a plurality of LED chips, and the relative positions and angles of the LED chips and the light guide plate can be determined by determining the position relation between the PCB and the light guide plate, so that the light guide assembly can provide a surface light source in a mode of eliminating opening shadows.

Preferably, the light guide plate is made of PMMA (polymethyl methacrylate) or PC (polycarbonate).

The light emitted by the light source enters the light guide plate from the incident surface, the transmission loss of the light is determined by the absorption degree of the light by the material of the light guide plate, and therefore, the loss of the light in the transmission process can be reduced by adopting a medium with high light transmittance, such as PMMA (polymethyl methacrylate) or PC (polycarbonate), and the light-emitting brightness of the light guide assembly is fully improved.

Preferably, the optical dots on the light guide plate are formed by laser dotting, by ink-jet printing, or by injection molding.

The LED chip sends out and gets into the inside light of light guide plate and is turned over the direction through the optical point, reflects the second and goes out the plain noodles, forms the area source, in order to guarantee the even and pleasing to the eye of area source light-emitting, the formation of optical point needs special technology, and the required optical point pattern design can be formed to the mode of adopting above, and the optical point density size of formation is controllable, can make the light guide component evenly give out light.

The invention also provides a lighting device, and the light guide assembly provided by the invention is used as a side-light-entering front lighting assembly.

The light guide assembly provided by the invention effectively eliminates the opening shadow, and the lighting device using the light guide assembly does not have the shadow generated by mounting and fixing accessories, so that the light emitted by the lamp is uniform and comfortable.

Drawings

FIG. 1 is a perspective view of a light guide assembly according to a first embodiment of the present invention;

FIG. 2 is a partial top view of a light guide assembly according to a second embodiment of the present invention;

FIG. 3 is a schematic view of a partial structure of a light source of a light guide assembly according to a second embodiment of the present invention;

FIG. 4 is a schematic top view of a portion of a light guide assembly according to a third embodiment of the present invention;

FIG. 5 is a schematic top view of a portion of a light guide assembly according to a fourth embodiment of the present invention;

fig. 6 is a partial top view of a light guide assembly according to a fifth embodiment of the present invention.

Description of the reference numerals

A. A light guide assembly; 1. a light guide plate; 11. a light incident surface; 12. a light-emitting surface; 12a, a first light emitting surface; 12b. a second light-emitting surface; 12a1. a light emitting area; 12a2. light mixing zone; 3, an LED chip mounting part; an LED chip; 4. opening a hole; 40. an opening; 41. an opening hole adjacent portion; 5. optical spot

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example one

A first embodiment of the present invention provides a light guide assembly, and fig. 1 is a perspective view of the light guide assembly according to the first embodiment of the present invention. Referring to fig. 1, the light guide assembly a includes a light guide plate 1 and an LED chip mounting portion 3 on which a plurality of LED chips 3a are mounted, wherein the light guide plate 1 is made of a material with good light transmittance and has a light incident surface 11 and a light emitting surface 12, the light emitting surface 12 includes a first light emitting surface 12a and a second light emitting surface 12b which are parallel to each other, the first light emitting surface 12a and the light incident surface 11 are perpendicular to each other, and the second light emitting surface 12b and the light incident surface 11 are perpendicular to each other. The first light emitting surface 12a includes a light emitting region 12a1 and a light mixing region 12a2, wherein a plurality of optical dots 5 are disposed in the light emitting region 12a1, and the optical dots 5 can be formed by irradiating laser light onto a portion of the originally smooth light emitting region 12a 1; the light mixing area 12a2 has a smooth surface and is disposed along the edge of the first light exiting surface 12a corresponding to the light entering surface 11.

The LED chip mounting portions 3 are provided along one side edge of the light guide plate 1, and a plurality of LED chips 3a mounted thereon are arranged at a predetermined pitch toward the light incident surface 11.

The light guide assembly a further includes an opening 4, the opening 4 is disposed along the same side edge of the light guide plate 1 corresponding to the LED chips 3a, and penetrates through the first light emitting surface 12a and the second light emitting surface 12b of the light guide plate 1, when the light guide assembly a is mounted and fixed, a fixing member, such as a fixing pin (not shown), is inserted into the opening 4, so that the light guide assembly a can be fixed on, for example, a housing of the lighting device by the fixing member. The opening 4 penetrates through the first light emitting surface 12a and the second light emitting surface 12b of the light guide plate 1, and the opening 40 left on the first light emitting surface 12a is disposed in the light mixing region 12a2, so that the opening 4 is located in the light guide plate 1 corresponding to the light mixing region 12a2.

After the light emitted from the LED chips 3a enters the light guide plate 1 through the light incident surface 11, part of the light may be emitted from the first light emitting surface 12a or reflected to the second light emitting surface 12b to form a surface light source because the optical points 5 of the first light emitting surface 12a destroy the total reflection condition, or part of the light may be emitted to the optical points 5 of the first light emitting surface 12a of the light guide plate 1 after being emitted to the second light emitting surface 12b of the light guide plate 1, and the above-mentioned change of the reflection angle is completed, so that the light is emitted from the first light emitting surface 12a and the second light guiding surface 12b of the light guide plate 1, and the light guide assembly emits light to form a surface light source. Meanwhile, because the light emitted by the LED chips 3a enters the light guide plate 1 through the light incident surface 11 on the side of the light guide plate 1, when passing through the opening 4 penetrating the light guide plate 1, part of the light enters the opening 4 to be reflected and interfered with the surrounding light to generate a shadow behind the opening, or when encountering a fixing member (not shown) inserted into the opening 4 to perform a fixing and positioning function, such as a fixing pin, the shadow is generated behind the opening 4, so that a user can observe the light from the light emitting surface 12, such as the second light emitting surface 12b, and the aesthetic degree of the light guide assembly a is affected.

In the embodiment, since the light mixing region 12a2 is not provided with the optical dots 5, light is totally reflected inside the light guide plate 1 corresponding to the light mixing region 12a2 and does not exit through the

light exit surface

12a or 12b, so the opening 40 is provided in the light mixing region 12a2, and the shadow generated by the opening 4 is also projected on the light guide plate 1 corresponding to the light mixing region 12a2 where no light exits and is not observed through the second light exit surface 12b by a user, thereby eliminating the shadow generated by the opening 4 or the fixing pin, and improving the appearance and the light exit comfort.

In the present embodiment, a single-side light-entering type is described as an example, but in the actual implementation of the present invention, the LED light guide assembly a may be, for example, an opposing double-side light-entering type, or a side light-entering type with more than two sides.

In addition, in the embodiment, only the first light emitting surface 12a and the second light emitting surface 12b are described, and those skilled in the art will understand that the present invention is not limited thereto, and other planes of the light guide assembly a, other than the light incident surface 11, can be used as the light emitting surfaces to implement the present invention.

In the present embodiment, the light mixing region 12a1 is provided on the side of the light guide plate 1 corresponding to the LED chip mounting portion 3, and the opening 4 is located in the light mixing region 12a1, but the present invention is not limited thereto, and the light mixing region having no optical point may be provided on the other edge side of the light guide plate 1 not corresponding to the LED chip mounting portion 3, so as to improve the appearance of the light guide assembly a.

Example two

A second embodiment of the present invention provides a light guide assembly. Fig. 2 is a partial top view of a light guide assembly according to a second embodiment of the present invention, and fig. 3 is a partial structure diagram of a light source of the light guide assembly according to the second embodiment of the present invention. The second embodiment is a further improvement of the first embodiment, and the main improvement lies in that in the second embodiment of the present invention, referring to fig. 2-3, fig. 2 is a partial top view of the light guide assembly after enlarging the light guide plate area where the opening 4 is located in fig. 1 and the LED chip mounting part 3 corresponding to the light guide plate area, and as shown in fig. 2, according to the position of the opening 4, the plurality of LED chips 3a are divided into a first LED chip group 31 arranged corresponding to the opening 4, and a second LED chip group 32 arranged adjacent to the first LED chip group 31 but not corresponding to the opening 4.

The LED chips 3a in the first LED chip group 31 are arranged in a row, and the distance between the LED chips 3a arranged in parallel along the edge of the light guide plate 1 and adjacent to each other is smaller than the distance between the LED chips 3a arranged in parallel along the edge of the light guide plate 1 and adjacent to each other in the second LED chip group 32, so the arrangement density of the LED chips located in the first LED chip group 31 is greater than the arrangement density of the LED chips located in the second LED chip group 32. Fig. 3 is a schematic diagram of a partial LED chip mounting structure in fig. 2, and since a plurality of LED chips 3a are regularly arranged on a PCB, selected parts are described, as shown in fig. 3, in the first LED chip group 31, a distance between a single LED chip a 'and a single LED chip b' adjacent to each other is smaller than a distance between a single LED chip a and a single LED chip b in the second LED chip group 32, so that a unit area LED arrangement density of the first LED chip group 31 is greater than a unit area LED arrangement density of the second LED chip group 32. The more densely the LED chips are arranged, the closer the first LED chip group 31 is to the line light source, the larger the light emitting area is, and the shadow is reduced by irradiating the shadow of the opening 4 with the light emitted by the first LED chip group. Meanwhile, the shadows of the openings 4 irradiated by the LED chips in the first LED chip groups 31 arranged corresponding to the openings 4 are mutually eliminated, so that the shadows are not observed by the user through the light emitting surface 12b. The more dense the LED chips are arranged, the smaller the shading is, and meanwhile, the weaker the degree of the shading is, so that the generated effect is better.

In the present embodiment, the arrangement density of the LED chips in the first LED chip group 31 per unit area is increased by reducing the pitch between the LED chips 3a in the first LED chip group 31, and it is further preferable that the pitch between the LED chips 3a in the first LED chip group 31 gradually increases in a direction away from the opening 4 until the pitch is the same as the pitch between the LED chips 3a in the second LED chip group 32, and the LED chips are arranged gradually. Therefore, the LED chips 3a in the first LED chip group 31 are more dense at the position close to the opening 4 and gradually and smoothly change to the arrangement density of the second LED chip group 32, so that the shadow generated by the opening 4 can be better eliminated, the brightness of the light guide plate 1 part corresponding to the first LED chip group 31 is more smoothly transited to the brightness of the light guide plate 1 part corresponding to the second LED chip group 32, and the light guide assembly is used as a surface light source to emit light more uniformly, comfortably and beautifully.

In this embodiment, the first LED chip sets 31 are densely arranged, which is likely to cause a problem of high heat dissipation requirement per unit area, and therefore, in this embodiment, for the first LED chip sets 31, corresponding heat dissipation mechanisms are disposed on the back surfaces thereof to improve the heat dissipation performance of the portions.

EXAMPLE III

A third embodiment of the present invention provides a light guide assembly. Fig. 4 is a partial top view of the light guide assembly enlarged from the light guide plate region where the opening 4 is located in fig. 1 and the LED chip mounting portion 3 corresponding thereto. The third embodiment is a further improvement of the second embodiment, and is mainly improved in that, in the third embodiment of the present invention, the distance between the LED chip 3a in the first LED chip group 31 and the light guide plate is different from the distance between the LED chip 3a in the second LED chip group 32 and the light guide plate.

Further, referring to fig. 4, the first LED chip group 31 is composed of point light sources corresponding to the diameter of the opening 4, and the distance from the opening 4 is greater than the distance from the second LED chip group 32 arranged not corresponding to the opening 4. The light-emitting brightness at the opening 4 is weakened by increasing the distance between the first LED chip group 31 and the opening 4, the shadow degree is correspondingly weakened, and at the moment, the light generated by the LED chip 3a adjacent to the first LED chip group 31 in the second LED chip group 32 irradiates to the position near the opening 4, so that the light is provided for the area with the weakened light-emitting brightness at the opening 4, and the light supplementing effect can be achieved.

Further, different from the second embodiment, the arrangement density of the LEDs in the unit area of the first LED chip set 31 in the present embodiment is not necessarily greater than the arrangement density of the LEDs in the unit area of the second LED chip set 32, and it is preferable that the arrangement density of the area adjacent to the first LED chip set 31 in the second LED chip set 32 is greater, so as to provide more light for the area with reduced light brightness of the opening 4, and make the light emitted more uniform and comfortable.

Example four

A fourth embodiment of the present invention provides a light guide assembly. Fig. 5 is a partial top view of a light guide assembly according to a fourth embodiment of the present invention. The fourth embodiment is an improvement of any one of the first to second embodiments, and is mainly improved in that, in the fourth embodiment of the present invention, referring to fig. 5, fig. 5 is an enlarged partial plan view of the light guide plate region where the hole 4 is located in fig. 1, a pattern formed by the optical dots 5 at the boundary edge of the light mixing region 12a2 and the light emitting region 12a1 is a predetermined pattern including a petal shape, a semicircular shape, a tree shape, a regular geometric shape, a cloud shape, a three-dimensional 3D shape, and the like, and the shadow of the hole 4 generated by irradiating the hole 4 with the LED chip 3a falls within the light mixing region 12a2 side of the predetermined pattern.

Referring to fig. 5, the opening ghost generated by the LED chip 3a irradiating the opening 4 is radial on the side of the opening 4 opposite to the LED chip 3a, and is strongest at the position closest to the opening 4. The pattern formed by the optical point 5 at the boundary edge of the light mixing region 12a2 and the light emitting region 12a1 is semicircular, the width of the light mixing region 12a2 is the largest at the position of the top of the semicircle, and the intrinsic shadow of the opening 4 is located at the inner center of the semicircle. Similarly, any given pattern should have its top at the widest of the light mixing region 12a2 and as many openings 4 as possible in the light mixing region 12a2. No light is emitted from the corresponding portion of the light mixing area 12a2, so that the shadow of the opening 4 falling therein cannot be observed by the user through the light emitting surface, thereby achieving the purpose of eliminating the shadow. Meanwhile, the prescribed pattern can also properly reduce the area ratio of the light mixing area 12a2 to the whole first light emitting surface 12a, and ensure the area of the light emitting area 12a1, thereby enhancing the light emitting brightness of the light guide assembly a and increasing the aesthetic effect through the pattern.

EXAMPLE five

A fifth embodiment of the present invention provides a light guide assembly. Fig. 6 is a partial top view of a light guide assembly according to a fifth embodiment of the present invention. The fifth embodiment is a modification of any one of the first to second embodiments, and is mainly modified in that, in the fifth embodiment of the present invention, as shown in fig. 6, the optical dot 5 density of the opening adjacent portion 41 of the opening 4 is locally increased on the light emitting region 12a1, and the optical dot 5 density of the opening adjacent portion 41 may be the same or substantially the same region as the shadow generated by the opening 4, so that the optical dot 5 density of the opening adjacent portion 41 is higher than the optical dot 5 density of the other portions. Because the light entering the light guide plate 1 is reflected to the second light emitting surface 12b through the optical dots 5 to form a surface light source, the light is reflected more times at the hole adjacent portion 41 in a manner of locally increasing the density of the optical dots 5 at the hole adjacent portion 41 which is the same as or substantially the same as the shadow generated by the hole 4, so that the brightness of the emergent light at the position of the shadow itself can be enhanced to more effectively eliminate the shadow generated by the hole 4, and the emergent light is more uniform.

In this embodiment, the density of the optical dots 5 of the opening adjacent portion 41 is increased to increase the light-emitting brightness of the light guide plate corresponding thereto, so as to eliminate the shadow of the opening 4, and it is further preferable that the density of the optical dots 5 of the opening adjacent portion 41 is gradually decreased from the position close to the opening 4 to the same density as the optical dots 5 of the remaining portion of the light-emitting region 12a1, so that the number of times of reflection of the light rays at the opening adjacent portion 41 is decreased from inside to outside, and the light-emitting brightness is also decreased, so as to eliminate the shadow of the opening 4 generated and gradually decreased from the opening 4, so that the brightness of the region in the light guide plate 1 is more smoothly transited to the brightness of the region in the light guide plate 1 corresponding to the light-emitting region 12a1, and the light-emitting from the light guide assembly a is more uniform and comfortable.

EXAMPLE six

A sixth embodiment of the present invention provides a light guide assembly. The sixth embodiment is an improvement of any one of the first to second embodiments, and is mainly improved in that the LED chip mounting portion is a PCB, and the PCB is mounted in combination with the light guide plate 1 by a fixing member (not shown). The plurality of LED chips 3a can be embedded in the PCB in a arraying and combining manner, so that the density of the plurality of LED chips 3a can be adjusted conveniently, and the relative positions and angles of the plurality of LED chips 3a and the light guide plate 1 can be determined by adjusting the position relation between the PCB and the light guide plate 1 according to the shape of a fixing component (not shown), so that the light guide component A can provide a surface light source in a manner of eliminating the opening shadow.

EXAMPLE seven

A seventh embodiment of the present invention provides a light guide assembly. The seventh embodiment is an improvement of any one of the first to second embodiments, and is mainly improved in that the light guide plate 1 included in the light guide assembly a is made of a resin material having high light transmittance, such as PMMA (polymethyl methacrylate) or PC (polycarbonate), so that loss of light during transmission is reduced, and light emitted from the LED chip 3a is sufficiently converted into a surface light source and is effectively diffused.

Example eight

An eighth embodiment of the present invention provides a light guide assembly. The eighth embodiment is an improvement of any one of the first to second embodiments, and is mainly improved in that the optical dots 5 on the light guide plate 1 are formed by laser dotting, ink jet printing or injection molding, and a specific pattern can be precisely formed as required, such as the pattern described in example six. And optical points 5 with different densities and sizes can be designed according to different distances between the LED chip 3a and the optical points 5, if the farther from the light source, the larger the light loss is, and the density and the size of the optical points are increased, so that the light can be uniformly emitted.

Example ten

A tenth embodiment of the present invention provides an illumination device using the light guide unit provided in any one of the first to eighth embodiments as a unit for side-entry front lighting.

The light guide assembly a provided in the first to eighth embodiments effectively eliminates shadows generated by the opening 4 and the fixing member inserted therein, and can make full use of the light source, and the light guide assembly a is used as a lighting device for side-entry front lighting to emit uniform and comfortable light.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light guide assembly for a lighting device, comprising:

the light guide plate is provided with a light incident surface and a light emergent surface;

an LED chip mounting portion provided in such a manner that a plurality of LED chips mounted thereon face the light incident surface;

an opening arranged along the same side edge of the light guide plate corresponding to the LED chips and penetrating through the light guide plate,

it is characterized in that the preparation method is characterized in that,

the light-emitting surface comprises a first light-emitting surface and a second light-emitting surface which are parallel to each other,

the first light-emitting surface is perpendicular to the light-incident surface, and the second light-emitting surface is perpendicular to the light-incident surface;

the first light-emitting surface comprises a light-emitting area and a light-mixing area;

an optical point which reflects part of light rays emitted into the light guide plate by the LED chip to the first light-emitting surface and the second light-emitting surface is arranged in the light-emitting area of the first light-emitting surface;

the light mixing area is provided with a smooth surface and is arranged along the edge of the light guide plate;

the opening hole corresponds to the opening of the first light emitting surface and is arranged in the light mixing area;

the LED chip mounting part is provided with a first LED chip group corresponding to the arrangement of the holes and a second LED chip group not corresponding to the arrangement of the holes, and the arrangement density of the LEDs in unit area of the first LED chip group is greater than that of the LEDs in unit area of the second LED chip group.

2. The light guide assembly of claim 1, wherein the first group of LED chips are arranged in parallel along the edge of the light guide plate and have a smaller pitch between adjacent LED chips than the second group of LED chips are arranged in parallel along the edge of the light guide plate and have a smaller pitch between adjacent LED chips.

3. The light guide assembly of claim 1, wherein a distance between the LED chips in the first group of LED chips and the light guide plate is different from a distance between the LED chips in the second group of LED chips and the light guide plate.

4. A light guide assembly according to claim 1, wherein the pattern formed by the optical dots at the boundary edge between the light mixing region and the light emitting region is a predetermined pattern, and the light mixing region side of the predetermined pattern is located within the shadow of the opening generated by the LED chip irradiating the opening.

5. The light guide assembly of claim 4, wherein the pattern comprises at least one of a petal shape, a semi-circle shape, a tree shape, a regular geometric figure, a cloud shape, and a solid 3D figure.

6. A light guide assembly according to claim 1, wherein the light emitting region has a greater optical dot density in an opening adjacent portion to the opening than in other portions.

7. The light guide assembly of claim 6, wherein the opening adjacent portion is located on a side of the opening opposite the LED chip.

8. The light guide assembly of claim 1, wherein the LED chip mounting portion is a PCB.

9. A light guide assembly according to claim 1, wherein the light guide plate is made of PMMA (polymethylmethacrylate) or PC (polycarbonate).

10. A light guide assembly according to claim 1, wherein the optical dots on the light guide plate are formed by laser dotting, by ink jet printing or by injection moulding.

11. A lighting device characterized by using the light guide member according to any one of claims 1 to 10 as a side-entry front lighting member.