CN102109129B - Annular light guide structure and backlight module using same - Google Patents

Annular light guide structure and backlight module using same Download PDF

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Publication number
CN102109129B
CN102109129B CN 200910312458 CN200910312458A CN102109129B CN 102109129 B CN102109129 B CN 102109129B CN 200910312458 CN200910312458 CN 200910312458 CN 200910312458 A CN200910312458 A CN 200910312458A CN 102109129 B CN102109129 B CN 102109129B
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CN
China
Prior art keywords
annular
guide structure
light guide
light
annular surface
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 200910312458
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Chinese (zh)
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CN102109129A (en
Inventor
柯骏程
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
Original Assignee
Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Publication date
Application filed by Hongfujin Precision Industry Shenzhen Co Ltd, Hon Hai Precision Industry Co Ltd filed Critical Hongfujin Precision Industry Shenzhen Co Ltd
Priority to CN 200910312458 priority Critical patent/CN102109129B/en
Publication of CN102109129A publication Critical patent/CN102109129A/en
Application granted granted Critical
Publication of CN102109129B publication Critical patent/CN102109129B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a backlight module. The backlight module comprises an annular light guide structure and a light source, wherein the annular light guide structure comprises an inner side face, a first annular surface and a second annular surface; the first annular surface is connected with the inner side face; the second annular surface is connected with the inner side face and is opposite to the first annular surface; a light source is arranged close to the first annular surface; the first annular surface of the annular light guide structure is provided with a plurality of first grooves which are extended along the light guide structure in the radial direction; and the second annular surface of the annular light guide structure is provided with a second groove which is extended along the light guide structure in the radial direction and corresponds to the light source. The second annular surface of the annular light guide structure is provided with the second groove corresponding to the light source, so that light is reflected into the annular light guide structure in halves. Thus, the annular light guide structure only requires a small number of light sources and is lower in cost. The first annular surface is provided with the plurality of first grooves, so that the light is reflected in a diffusing way, and the emitted light is more uniform.

Description

Annular light guide structure and adopt the backlight module of this annular light guide structure
Technical field
The present invention relates to a kind of annular light guide structure and adopt the backlight module of this annular light guide structure.
Background technology
Be typically provided with backlight module on the electronic installation such as instrument board, keyboard, this backlight module is used for the annular luminous zone of electronic installation is illuminated.
A kind of backlight module, it comprises annular light guide structure and a plurality of light emitting diode.This annular light guide structure comprises annular exiting surface and the annular incidence surface relative with this annular exiting surface.These a plurality of light emitting diodes are located at this annular incidence surface.Light after Multi reflection, penetrates from annular exiting surface in annular light guide structure from this annular incidence surface incident.
Yet the position near light emitting diode on the annular exiting surface of the annular light guide structure of above-mentioned backlight module is brighter, and is dimer away from the position of light emitting diode, causes the luminance nonuniformity of annular exiting surface even.And above-mentioned backlight module needs a plurality of light emitting diodes, and its cost is higher.
Summary of the invention
In view of above-mentioned condition, the backlight module that is necessary to provide the more even and lower-cost annular light guide structure of a kind of bright dipping and adopts this annular light guide structure.
A kind of annular light guide structure, it comprises the first annular surface and second annular surface relative with the first annular surface.The annular light guide structure is formed with a plurality of the first grooves that radially extend along light guide structure on the first annular surface, the annular light guide structure is formed with second groove on the second annular surface, be formed with light in part on this first annular surface, these a plurality of the first grooves are positioned at the both sides of this light in part, this second groove and this light in part are oppositely arranged, also be formed with interval parts on this first annular surface, this interval parts and this light in part are symmetrical with respect to this first annular centre of surface.
A kind of backlight module, it comprises an annular light guide structure and a light source.The annular light guide structure comprises the first annular surface and second annular surface relative with the first annular surface.Light source and the second annular surface are oppositely arranged.a plurality of the first grooves that the annular light guide structure is formed with on the first annular surface, the annular light guide structure is formed with on the second annular surface along light guide structure and radially extends and second groove corresponding with light source, be formed with light in part on this first annular surface, these a plurality of first grooves are arranged at this light in part both sides, this second groove and this light in part are oppositely arranged, the light that this light source sends is injected in this annular light guide structure from this light in part, also form interval parts on this first annular surface, this interval parts and this light in part are symmetrical with respect to this first annular centre of surface.
On the second annular surface of above-mentioned annular light guide structure, corresponding light source is formed with the second groove, and light is reflected in annular light guide structure with being divided into two.Therefore, above-mentioned annular light guide structure needs the minority light source to get final product, and cost is lower.And, be formed with a plurality of the first grooves on the first annular surface, light is reflected with being diffused, thereby make emergent ray more even.
Description of drawings
Fig. 1 is the three-dimensional exploded view of backlight module of the present invention.
Fig. 2 is the three-dimensional exploded view of the other direction of backlight module shown in Figure 1.
Fig. 3 is the schematic diagram of the annular light guide structure of backlight module shown in Figure 1.
Fig. 4 is the partial assembly drawing of backlight module shown in Figure 1.
The main element symbol description
Light transmission piece 20
The first reflector plate 30
The second reflector plate 40
The 3rd reflector plate 50
Light source 60
Annular light guide structure 70
Medial surface 71
The first annular surface 72
The first groove 723
Light in part 725
Interval parts 726
The second annular surface 73
The second groove 731
Lateral surface 75
Backlight module 100
The specific embodiment
Be described in further detail below in conjunction with the backlight module of drawings and the embodiments to annular light guide structure of the present invention and employing annular light guide structure.
See also Fig. 1 to Fig. 2, the backlight module 100 of better embodiment of the present invention comprises a light transmission piece 20, first reflector plate 30, second reflector plate 40, the 3rd reflector plate 50, a light source 60 and an annular light guide structure 70.Light transmission piece 20, the first reflector plate 30, the second reflector plate 40 and the 3rd reflector plate 50 form the receiving space (indicating) of a sealing, so that annular light guide structure 70 and light source 60 are sealed in the inner.
Light transmission piece 20 is the annular laminated structure, and it can adopt transparent resin or glass to make.
The first reflector plate 30 and the second reflector plate 40 roughly are cylindric.The diameter of the first reflector plate 30 is less than the diameter of the second reflector plate 40.
The 3rd reflector plate 50 is for being roughly the laminated structure of annular, and in it, outer peripheral edges are connected with the periphery of the first reflector plate 30 and the second reflector plate 40 respectively.
See also Fig. 3, annular light guide structure 70 is annular, and its inside radius is R1, and outer radius is R2, and thickness is d.Annular light guide structure 70 comprises medial surface 71, the first annular surface 72, the second annular surface 73 and lateral surface 75.Medial surface 71 is parallel relative with lateral surface 75, and the first annular surface 72 is parallel relative with the second annular surface 73.Medial surface 71 and lateral surface 75 all are connected with the first annular surface 72 and the second annular surface 73.
Be formed with a plurality of the first grooves 723 that radially extend along annular light guide structure 70 on the first annular surface 72, wherein leave light in part 725 and the interval parts 726 of fan annular.Light in part 725 and interval parts 726 are with respect to the Central Symmetry of the first annular surface 72.A plurality of the first groove 723 spaced sets.From light in part 725 along these the first annular surface 72 peripheries to the direction of interval parts 726, the length of these a plurality of the first grooves 723 increases progressively.The angle of this light in part 725 is a1.The width of the first groove 723 is b1.Be formed with one second groove 731 that radially extends along annular light guide structure 70 corresponding to light in part 725 on the second annular surface 73.The degree of depth of the second groove 731 is h1, and drift angle is a3.The first groove 723 and the second groove 731 be shaped as V-type, semi-circular and semiellipse type one of them.
Specifically in the present embodiment, light source 60 is light emitting diode, and the first groove 723 and the second groove 731 are the V-type groove, R1 is 15 millimeters, R2 is 10 millimeters, and d is 5 millimeters, and the number of the first groove 723 is 60, the increment value of the length of a plurality of the first grooves 723 is 0.11 millimeter, the first groove 723 drift angles are 54.5 degree, and a1 is 10 degree, and a3 is 50 degree, b1 is 0.35 millimeter, and h1 is 4.5 millimeters.Annular light guide structure 70 can be made by polymethyl methacrylate (PMMA) resin of acryl.The refractive index of annular light guide structure 70 is 1.489.
Please consult simultaneously Fig. 1 and Fig. 4, assembling is during backlight module 100, at first, the interior outer peripheral edges of light transmission piece 20 is connected with the periphery of the first reflector plate 30 and the second reflector plate 40 respectively, has the receiving space of opening with formation.Then, annular light guide structure 70 is positioned in this receiving space.Then, light source 60 is positioned over the position corresponding with the light in part 725 of the second annular surface 73 of annular light guide structure 70.At last, the interior outer peripheral edges of the 3rd reflector plate 50 are connected with the periphery of the first reflector plate 30 and the second reflector plate 40 respectively, with complete closed ring light guide structure 70.
Light penetrates from light source 60, inject from the first annular surface 72 of annular light guide structure 70, after being reflected by the side ancient piece of jade, round, flat and with a hole in its centre of the second groove 731 of the second annular surface 73 with being divided into two, at the interior Multi reflection of annular light guide structure 70, after wherein most of light is reflected diffusely by a plurality of the first grooves 723, directly penetrate from the second annular surface 73.Another part light penetrates from the first annular surface 72, two sides (not indicating) of annular light guide structure 70, after the first reflector plate 30, the second reflector plate 40 and the 3rd reflector plate 50 reflections, again inject in annular light guide structure 70, until penetrate from the second annular surface 73.
On the second annular surface 73 of above-mentioned annular light guide structure 70, corresponding light source 60 is formed with the second groove 731, and light is reflected in annular light guide structure 70 with being divided into two.Therefore, above-mentioned annular light guide structure 70 needs minority light source 60 to get final product, and its cost is lower.And, be formed with a plurality of the first grooves 723 on the first annular surface 72, light is reflected with being diffused, thereby make emergent ray more even.
Further, from light in part 725 along these the first annular surface 72 peripheries to the direction of interval parts 726, the length of a plurality of the first grooves 723 increases progressively, and light is spread more equably, thereby makes the briliancy of the second annular surface 73 more even.
Annular light guide structure 70 can be by the method manufacturing of ejection formation, and this manufacture method is as follows:
(1) adopt diamond cutting (Diamond Turning) method to process a plurality of first V-type projections corresponding with a plurality of the first grooves 723 and second a V-type projection corresponding with the second groove 731 on die, and this die is put on die holder.
(2) utilize this die holder and the die ejection formation should annular light guide structure 70.
Be appreciated that annular light guide structure 70 is not limited to circle, also can be the sub-circular structure, such as ellipse etc.
In addition, those skilled in the art also can do other variation in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included in the present invention's scope required for protection.

Claims (6)

1. backlight module, it comprises annular light guide structure and light source, this annular light guide structure comprises medial surface, the first annular surface that is connected with this medial surface reaches and is connected with this medial surface and second annular surface relative with this first annular surface, this light source is near this first annular surface setting, it is characterized in that: this annular light guide structure is formed with a plurality of the first grooves that radially extend along this light guide structure on the first annular surface, this annular light guide structure is formed with on this second annular surface along this light guide structure and radially extends and second groove corresponding with this light source, be formed with light in part on this first annular surface, these a plurality of first grooves are arranged at this light in part both sides, this second groove and this light in part are oppositely arranged, the light that this light source sends is injected in this annular light guide structure from this light in part, also form interval parts on this first annular surface, this interval parts and this light in part are symmetrical with respect to this first annular centre of surface.
2. backlight module as claimed in claim 1 is characterized in that: these a plurality of first groove spaced sets, and from light in part along this first annular surface periphery to the direction of this interval parts, the length of these a plurality of the first grooves increases progressively.
3. annular light guide structure, it comprises medial surface, the first annular surface that is connected with this medial surface reaches and is connected with this medial surface and second annular surface relative with this first annular surface, it is characterized in that: this annular light guide structure is formed with a plurality of the first grooves that radially extend along this light guide structure on this first annular surface, this annular light guide structure is formed with one second groove that radially extends along this light guide structure on this second annular surface, be formed with light in part on this first annular surface, these a plurality of the first grooves are positioned at the both sides of this light in part, this second groove and this light in part are oppositely arranged, also be formed with interval parts on this first annular surface, this interval parts and this light in part are symmetrical with respect to this first annular centre of surface.
4. annular light guide structure as claimed in claim 3 is characterized in that: these a plurality of first groove spaced sets, and from light in part along this first annular surface periphery to the direction of this interval parts, the length of these a plurality of the first grooves increases progressively.
5. annular light guide structure as claimed in claim 4, it is characterized in that: the length increment value of these a plurality of the first grooves is 0.11 millimeter, and this annular light guide structure is circular, and its inside radius is 10 millimeters, and outer radius is 15 millimeters, thickness is 5 millimeters.
6. as claim 3 a described annular light guide structure, it is characterized in that: the first groove be shaped as V-type, semi-circular and semiellipse type one of them.
CN 200910312458 2009-12-29 2009-12-29 Annular light guide structure and backlight module using same Expired - Fee Related CN102109129B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2807615C (en) * 2012-03-08 2020-06-30 Simplehuman, Llc Vanity mirror
TWI563203B (en) 2013-09-18 2016-12-21 Nifco Inc Illumination device
CN107390431B (en) * 2017-08-17 2024-02-23 信利半导体有限公司 Backlight module and liquid crystal display module
CN110388598A (en) * 2019-07-31 2019-10-29 富晟亿美汽车光电零部件(长春)有限公司 Interior trim atmosphere lamp assembly
CN111594776A (en) * 2020-03-12 2020-08-28 橙景国际有限公司 Be applied to light structure of vanity mirror
CN111557540B (en) * 2020-03-12 2023-03-24 橙景国际有限公司 Cosmetic mirror with holding structure
CN114063207A (en) * 2021-10-28 2022-02-18 惠州雷士光电科技有限公司 Light guide piece, light guide system and lamp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6619829B1 (en) * 2002-11-05 2003-09-16 Shih Ling Chen Lighting device for vehicle
US6641295B1 (en) * 2002-05-24 2003-11-04 Wendell Ng-Sell-Quan Fog light device
CN101451682A (en) * 2007-12-06 2009-06-10 富士迈半导体精密工业(上海)有限公司 Ring lighting device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10137605A1 (en) * 2001-08-01 2003-02-27 Hella Kg Hueck & Co Light for vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6641295B1 (en) * 2002-05-24 2003-11-04 Wendell Ng-Sell-Quan Fog light device
US6619829B1 (en) * 2002-11-05 2003-09-16 Shih Ling Chen Lighting device for vehicle
CN101451682A (en) * 2007-12-06 2009-06-10 富士迈半导体精密工业(上海)有限公司 Ring lighting device

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