CN102529026B - Light guiding board mould core, method for manufacturing light guide plate and light guide plate - Google Patents
Light guiding board mould core, method for manufacturing light guide plate and light guide plate Download PDFInfo
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- CN102529026B CN102529026B CN201010611293.9A CN201010611293A CN102529026B CN 102529026 B CN102529026 B CN 102529026B CN 201010611293 A CN201010611293 A CN 201010611293A CN 102529026 B CN102529026 B CN 102529026B
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- guide plate
- light guide
- light
- forming surface
- guiding board
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Abstract
The present invention relates to a kind of light guiding board mould core, it comprises forming surface, be positioned at multiple sites that this forming surface is formed by this forming surface of Laser Processing caves in and is positioned in this forming surface and process by sandblasting at least one nebulization region that this forming surface formed, this forming surface is used for the reflecting surface of formed light conductive plate, this at least one nebulization region comprises multiple microgrid point depression, in same unit are, the density of this site of density ratio depression of this microgrid point depression is large.The invention still further relates to a kind of method for manufacturing light guide plate and a kind of light guide plate manufactured by the method.
Description
Technical field
The present invention relates to a kind of light guiding board mould core, a kind of method for manufacturing light guide plate and a kind of light guide plate.
Background technology
Because liquid crystal can not self-luminous, therefore, liquid crystal display generally need comprise the backlight module providing light source to liquid crystal panel.And the key component in backlight module is light guide plate, light guide plate is assembly spot light or line source being converted into area source, and the uniformity of light guide plate bright dipping directly affects the quality of backlight module.
At present, the method manufacturing light guide plate is jet forming method, is specially, is fixed in the die cavity of mould by the die with optical texture, inject in the die cavity of mould by the moulding material of melting, after cooling, ejected by the formed body in die cavity and just make light guide plate.The optical texture of die is transferred to the reflecting surface of light guide plate.Therefore, the design of die optical texture directly affects the light-emitting uniformity of light guide plate.
Summary of the invention
In view of this, be necessary to provide a kind of light guiding board mould core and a kind of method for manufacturing light guide plate and a kind of light guide plate, it all can improve the light-emitting uniformity of this light guide plate.
A kind of light guiding board mould core, it comprises forming surface, be positioned at multiple sites that this forming surface is formed by this forming surface of Laser Processing caves in and is positioned in this forming surface and process by sandblasting at least one nebulization region that this forming surface formed, this forming surface is used for the reflecting surface of formed light conductive plate, this at least one nebulization region comprises multiple microgrid point depression, in same unit are, the density of this site of density ratio depression of this microgrid point depression is large.
A kind of method for manufacturing light guide plate, it comprises:
Above-mentioned light guiding board mould core is provided;
This light guiding board mould core is fixed in mould;
Injection moulding material in this mould;
Cool this moulding material in this mould; And
The demoulding is to obtain light guide plate.
A kind of light guide plate, it is obtained by method for manufacturing light guide plate described above, this light guide plate comprises reflecting surface and multiple site of being positioned on this reflecting surface and at least one nebulization region be positioned on this reflecting surface, this at least one nebulization region comprises multiple microgrid point, in same unit are, the density of this site of density ratio of this microgrid point is large.
Light guiding board mould core provided by the invention, it is provided with the lattice point structure that density is different and be made up of different processing methods in forming surface, when making the light guide plate homogenizing light utilizing this die to manufacture, low density lattice point structure can be utilized to carry out thick homogenizing to light and the lattice point structure that utilizes density high carries out thin homogenizing to light and eliminates blanking bar, and then improve the light-emitting uniformity of light guide plate.
Accompanying drawing explanation
The schematic perspective view of a kind of light guiding board mould core that Fig. 1 provides for first embodiment of the invention.
Fig. 2 is the graph of a relation of the sandblasting parameter of the light guiding board mould core utilizing sandblasting process manuscript 1.
Fig. 3 is another graph of a relation of the sandblasting parameter of the light guiding board mould core utilizing sandblasting process manuscript 1.
Fig. 4 is the schematic cross-section of the mould of the die formed light conductive plate utilizing Fig. 1.
The schematic perspective view of a kind of light guide plate that Fig. 5 provides for second embodiment of the invention.
Fig. 6 is the Luminance Distribution schematic diagram of the exiting surface of the light guide plate of Fig. 5.
Fig. 7 is the Luminance Distribution schematic diagram of the exiting surface of another light guide plate compared with the light guide plate of Fig. 5.
Main element symbol description
Light guiding board mould core 100
Forming surface 12
Site depression 14
Nebulization region 16
First side 17
Second side 18
Mould 200
Cover half 21
Dynamic model 22
Sprue 25
Runner 26
Cast gate 24
Die cavity 23
Light guide plate 300
Incidence surface 31
Exiting surface 32
Reflecting surface 33
Side 34
Optical design structure 35
Site 351
Nebulization region 352
Detailed description of the invention
Below in conjunction with graphic, the present invention is described in further detail.
Refer to Fig. 1, two nebulization region 16 that a kind of light guiding board mould core 100 that first embodiment of the invention provides comprises forming surface 12, is positioned at the multiple sites depression 14 in forming surface 12 and is positioned in forming surface 12.
The material of this light guiding board mould core 100 is stainless steel.This forming surface 12 is minute surface, and it is for the reflecting surface 33 (bottom surface, ginseng Fig. 5) of formed light conductive plate 300.
The plurality of site depression 14 formed by this forming surface 12 of Laser Processing.This first side 17 and this second side 18 are positioned at the opposing both sides of this light guiding board mould core 100.
In present embodiment, the surface roughness of each nebulization region 16 is 0.5-0.7 micron.This nebulization region 16 processes this forming surface by sandblasting formed.Nebulization region 16 comprises multiple microgrid point depression.The surface roughness of nebulization region 16 is larger, and the density of microgrid point depression is higher.In same unit are, the density of this site of density ratio depression 14 of this microgrid point depression is large.
Two nebulization region 16 are two corners of the light guiding board mould core 100 laid respectively near the second side 18.This nebulization region 16 surrounds some sites depression 14 of the plurality of site depression 14.
Sandblasting process Principal tunable parameters comprises sand-blast material, jetting height, scan spacing (nozzle moving interval), nozzle translational speed and expulsion pressure etc. (ginseng table 1).At this, target workpiece is the light guiding board mould core 100 of steel, so sand-blast material selects the larger carborundum (SiC) of cutting force, make the transferability not good of the reflecting surface pattern of light guide plate 300 during ejection formation to avoid the microgrid point cup depth because of nebulization region 16 not enough.Jetting height controls effective diameter scope also affects the selection suitably scanning spacing simultaneously, takes suitable height with spacing and preset parameter, and the collocation of Negotiation speed and pressure obtains required roughness.
Table 1 sandblasting parameter
Below just respectively with expulsion pressure and nozzle translational speed for variable, and fix other parameter as an example, obtain surface roughness respectively with the graph of a relation of expulsion pressure and nozzle translational speed.
Example 1: preset parameter comprises sand-blast material: SiC; Nozzle height: 150mm; Translational speed: 150mm/s; And nozzle moving interval (Pitch): 5mm.Obtain graph of a relation please refer to the drawing 2 of surface roughness and expulsion pressure.
Example 2: preset parameter comprises sand-blast material: SiC; Nozzle height 150mm; Expulsion pressure: 3MPa; Nozzle moving interval: 5mm.Obtain graph of a relation please refer to the drawing 3 of surface roughness and nozzle translational speed.Therefore, by controlling above-mentioned parameter, the surface roughness of required nebulization region 16 can be obtained.
Please refer to the drawing 4, when utilizing this die 100 to manufacture light guide plate 300, is fixed on this die 100 in mould 200.Particularly, this mould 200 comprises cover half 21 and dynamic model 22, and light guiding board mould core 100 is fixed on the diapire of dynamic model 22.Wherein, cover half 21 is formed the sprue 25 and runner 26 that flow into for molten resin (moulding material), and this runner 26 is large to the tapered change in dynamic model 22 1 lateral section.At the faying face of cover half 21 with dynamic model 22, form cast gate 24 along two moulds 21,22, cast gate 24 is communicated with runner 26.Engaged with dynamic model 22 by cover half 21, form the die cavity 23 being used for light guide plate shaping, die cavity 23 is all communicated with above-mentioned cast gate 24, runner 26 and sprue 25.When manufacturing light guide plate, the resin of melting, as polymethyl methacrylate (PMMA), die cavity 23 is entered by sprue 25, runner 26 and cast gate 24, when the molten resin that the enclosure space of die cavity 23 is injected by flowing is full of, then through refrigerating work procedure, open dynamic model 22, utilize the light guide plate demoulding that ejecting mechanism (not shown) makes to be shaped, plate shaped light guide plate 300 as shown in Figure 5 can be obtained.
This light guide plate 300 comprises incidence surface 31, exiting surface 32, reflecting surface 33, side 34 and optical design structure 35.This incidence surface 31 connects this exiting surface 32 and this reflecting surface 33, and this side 34 connects this exiting surface 32 and this reflecting surface 33.This incidence surface 31 is positioned at the opposing both sides of light guide plate 300 with this side 34.This optical design structure 35 is positioned on this reflecting surface 33.This optical design structure 35 and this reflecting surface 33 are shaping by light guiding board mould core 100 institute, and this optical design structure 35 comprises multiple site 351 and two nebulization region 352.Multiple site 351 is shaping by multiple sites depression 14 institute in the forming surface 12 of light guiding board mould core 100, and nebulization region 352 is shaping by nebulization region 16 institute in the forming surface 12 of light guiding board mould core 100.The surface roughness of two nebulization region 352 is 0.5-0.7 micron, and it lays respectively at light guide plate 300 two corners near side 34.Nebulization region 352 comprises multiple microgrid point.In same unit are, the density of this site 351 of density ratio of this microgrid point is large, as large 10-100 times.
The intensity map of the exiting surface 32 of the light guide plate 300 that please refer to the drawing 6 to Fig. 7, Fig. 6 provide for present embodiment, A represents incidence surface 31 side, and B represents side 34 side opposing with incidence surface 31.Fig. 7 does not arrange the intensity map of the shaping light guide plate exiting surface of the light guiding board mould core of nebulization region 16 by utilization in forming surface 12, and A1 represents incidence surface side, and B1 represents the side opposing with incidence surface.The intensity map of exiting surface can be measured by plane brightness measurement.
In intensity map in Fig. 7, measuring the minimum brightness obtained is 4695cd/m2, maximum brightness is 6156cd/m2, and the luminance difference value of maximum brightness and minimum brightness is 1461, and the uniformity (uniformity=minimum brightness/maximum brightness) is 76.27%.In intensity map in Fig. 6, measuring the minimum brightness obtained is 4746cd/m2, and maximum brightness is 5646cd/m2, and the luminance difference value of maximum brightness and minimum brightness is 900, and the uniformity (uniformity=minimum brightness/maximum brightness) is 84.05%.As known from the above, outgoing light homogeneity significantly promotes by the light guide plate 300 of present embodiment, can by light outgoing more equably.
Light guiding board mould core 100 provided by the invention, it is provided with density difference and the lattice point structure formed by different processing methods in forming surface 12, when making the light guide plate 300 homogenizing light utilizing this die 100 to manufacture, low density lattice point structure 351 pairs of light can be utilized to carry out thick homogenizing and lattice point structure 352 pairs of light of utilizing density high carry out thin homogenizing and eliminate blanking bar, and then improve the light-emitting uniformity of light guide plate 300.
In addition, those skilled in the art can also do other change in spirit of the present invention.Certainly, these changes done according to the present invention's spirit, all should be included within the present invention's scope required for protection.
Claims (8)
1. a light guiding board mould core, it is characterized in that, this die comprises forming surface, be positioned at multiple sites that this forming surface is formed by this forming surface of Laser Processing caves in and is positioned in this forming surface and process by sandblasting at least one nebulization region that this forming surface formed, this forming surface is used for the reflecting surface of formed light conductive plate, this at least one nebulization region comprises multiple microgrid point depression, in same unit are, the density of this site of density ratio depression of this microgrid point depression is large.
2. light guiding board mould core as claimed in claim 1, it is characterized in that, the surface roughness of this at least one nebulization region is 0.5-0.7 micron.
3. light guiding board mould core as claimed in claim 1, is characterized in that, this at least one nebulization region surrounds some sites depression of the plurality of site depression.
4. a method for manufacturing light guide plate, it comprises:
Light guiding board mould core as claimed in claim 1 is provided;
This light guiding board mould core is fixed in mould;
Injection moulding material in this mould;
Cool this moulding material in this mould; And
The demoulding is to obtain light guide plate.
5. method for manufacturing light guide plate as claimed in claim 4, it is characterized in that, the surface roughness of this at least one nebulization region is 0.5-0.7 micron.
6. a light guide plate, its improvement is, this light guide plate is obtained by method for manufacturing light guide plate as claimed in claim 5, this light guide plate comprises reflecting surface and multiple site of being positioned on this reflecting surface and at least one nebulization region be positioned on this reflecting surface, this at least one nebulization region comprises multiple microgrid point, in same unit are, the density of this site of density ratio of this microgrid point is large.
7. light guide plate as claimed in claim 6, it is characterized in that, this light guide plate also comprises incidence surface, exiting surface and side, and this incidence surface connects this exiting surface and this reflecting surface, this side connects this exiting surface and this reflecting surface, and this incidence surface and this side are positioned at the opposing both sides of this light guide plate.
8. light guide plate as claimed in claim 7, it is characterized in that, relative to this incidence surface, this at least one nebulization region is near this side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010611293.9A CN102529026B (en) | 2010-12-29 | 2010-12-29 | Light guiding board mould core, method for manufacturing light guide plate and light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010611293.9A CN102529026B (en) | 2010-12-29 | 2010-12-29 | Light guiding board mould core, method for manufacturing light guide plate and light guide plate |
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| Publication Number | Publication Date |
|---|---|
| CN102529026A CN102529026A (en) | 2012-07-04 |
| CN102529026B true CN102529026B (en) | 2015-10-14 |
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| CN201010611293.9A Expired - Fee Related CN102529026B (en) | 2010-12-29 | 2010-12-29 | Light guiding board mould core, method for manufacturing light guide plate and light guide plate |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105345959A (en) * | 2015-08-25 | 2016-02-24 | 靖江市永盛光电科技有限公司 | Processing technology of small circle arc of back light guide plate |
| CN105365117A (en) * | 2015-08-25 | 2016-03-02 | 靖江市永盛光电科技有限公司 | Griffe machining process of light guide plate die core |
| CN105629634A (en) * | 2016-02-26 | 2016-06-01 | 苏州巨硕智能技术有限公司 | Reflector and detection device with same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035174Y (en) * | 2007-01-09 | 2008-03-12 | 瑞仪光电股份有限公司 | Sidelight type light conducting plate |
| CN101733874A (en) * | 2008-11-04 | 2010-06-16 | 江俊慧 | Manufacturing method of light guide plate and mould used by same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3542059B2 (en) * | 1997-03-26 | 2004-07-14 | クリエイト株式会社 | How to make a light guide plate |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201035174Y (en) * | 2007-01-09 | 2008-03-12 | 瑞仪光电股份有限公司 | Sidelight type light conducting plate |
| CN101733874A (en) * | 2008-11-04 | 2010-06-16 | 江俊慧 | Manufacturing method of light guide plate and mould used by same |
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| CN102529026A (en) | 2012-07-04 |
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Effective date of registration: 20160918 Address after: Xiangzhou District of Guangdong city in Zhuhai province 519000 Permanent Road No. 21 Building 2 Patentee after: Zhuhai branch photoelectric Co., Ltd. Address before: 518109 Guangdong city of Shenzhen province Baoan District Longhua Town Industrial Zone tabulaeformis tenth East Ring Road No. 2 two Patentee before: Hongfujin Precise Industry (Shenzhen) Co., Ltd. Patentee before: Hon Hai Precision Industry Co., Ltd. |
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Granted publication date: 20151014 Termination date: 20171229 |