CN101476698A - Press-key backlight light-guiding film and its production method - Google Patents
Press-key backlight light-guiding film and its production method Download PDFInfo
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- CN101476698A CN101476698A CNA2009100282952A CN200910028295A CN101476698A CN 101476698 A CN101476698 A CN 101476698A CN A2009100282952 A CNA2009100282952 A CN A2009100282952A CN 200910028295 A CN200910028295 A CN 200910028295A CN 101476698 A CN101476698 A CN 101476698A
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Abstract
The invention discloses a key backlight light guide film and a manufacturing method thereof. The light guide film mainly comprises a transparent light guide film layer and light guide screen dots which are arranged on the light guide film layer. The light guide film is characterized in that the light guide screen dots are fully distributed in a luminous area of the light guide film layer, and adjacent light guide screen dots are tightly arrayed; the depth of each light guide screen dot is changed according to the distance of the light guide screen dot and a light source on the basis of an optical principle so as to achieve uniform light guide. The manufacturing method comprises the following steps: setting the depth of each light guide screen dot according to the optical principle; preparing a metal mold; and preparing the light guide film adopting a heat pressing or UV pressing mode. The method for preparing the metal mold comprises: adopting laser to etch the screen dots by changing the depth; preparing a mother matrix; and obtaining the metal mold by electrocasting. The light guide film has no specific requirements on the transparency of a transparent area of keys, and solves the problem that a transparent crystal key mobile phone cannot use the light guide film. At the same time, the light guide film can improve the transparency of the mobile phone keys, and increase the energy utilizing rate of the backlight.
Description
Technical field
The present invention relates to a kind of backlight light-guiding device, be specifically related to a kind of light guiding film that is used for keyboard back light and preparation method thereof.
Background technology
Keyboard still is widely used on electronic products such as mobile phone, electronic dictionary, notebook computer at present.Along with the consumer to electronic product to needs frivolous, energy-conservation, easy to use, the key-press backlight of electronic product also becomes the object of concern.
Under ultra-thin, energy-conservation trend, the light guiding film product becomes electronic products such as mobile phone provides preferred version backlight.A kind of preparation method of light guiding film die is disclosed in Chinese invention patent application CN101034183A, promptly applicable to this series products of preparation.In addition, Chinese utility model patent CN201072075Y discloses a kind of light guiding film, and discloses the mobile phone component backlight source structure that adopts this light guiding film in the literature.According to optical principle, light guiding film/LGP is for obtaining uniform light guide effect, and common way is the distance according to distance L ED position, changes the density of leaded light site, perhaps changes the diameter of site, and the site is generally discrete and arranges.In above-mentioned patent, the leaded light site only changes shape or light-emitting area, and in order to obtain the uniformly light-emitting of whole keytop, its network point distribution must be arranged sparse in the low beam district, and light-emitting area is less, and at far-light area, it is intensive to arrange in the site, and promptly light-emitting area is bigger.The discrete distribution in site must appear in such site arrangement mode, and under the LED illumination, each luminous site is high-visible.Yet, when light guiding film is applied to mobile phone, in the light-transmission character district of mobile phone key, if as seen the site, is to be accepted by cell phone manufacturer and consumer.In order to obtain better visual effect, common way is in the technical process of button, must reduce the transparency of transparent area or make transparent area present certain particular color, the discrete visible luminous site of light guiding film below hiding.Thereby can't be applied to the transparent mobile phone key in luminous zone, such as the crystal key mobile phone, make mobile phone attractive in appearance and ultra-thin on can not take into account.In addition, reduce the transparency of button transparent area, will inevitably reduce the luminous intensity of button,, need adopt more high-power LED, bring the drawback that power consumption is big, cost is high thus in order to reach higher brightness.
Summary of the invention
The object of the invention provides a kind of light guiding film with continuous face illumination effect, when make adopting light guiding film as the key-press backlight of electronic products such as mobile phone, transparency to the transparent area of button does not have particular requirement, solution can't be used the problem of light guiding film with the pebble key mobile phone, increases capacity usage ratio backlight simultaneously.
Another object of the present invention provides the preparation method of this light guiding film.
For achieving the above object, the technical solution used in the present invention is: a kind of press-key backlight light-guiding film, mainly constitute by transparent light guide rete and the leaded light site that is arranged on the leaded light rete, described leaded light site is covered with in the luminous zone of leaded light rete, closely arrange adjacent leaded light site, the degree of depth of each leaded light site changes by optical principle according to the distance with light source, realizes even light-guiding.
In the technique scheme, described each leaded light site is a polygon, and the length of side is 10um～200um.For example, can adopt geometries such as square, prismatic, triangle, each shape need satisfy compact arranged requirement between the site.Take all factors into consideration the time and the surperficial visual effect of making mould, select length of side 40um usually for preferred.
Perhaps, described each leaded light site is circular, and diameter is 10um～40um.When the site diameter was not more than 40um, closely arranged each site, and the luminous zone of the light guiding film of making shows as visual continuous face equally.
In the technique scheme, the depth bounds of described each leaded light site is 1um～20um.
Above, adopting the leaded light lattice point structure is set on light guiding film, realize even light-guiding, be a kind of common design, yet design of the prior art all is confined to change the size of leaded light site and the density of distribution, and this has formed a kind of thinking set.The present invention creatively changes leaded light by the degree of depth that changes the leaded light site, satisfies the uniformity of luminance requirement; And the structure of densely covered leaded light site has creatively been proposed, thus under the LED illumination, its light-emitting zone is a continuous face, and lattice point structure is not differentiated under macroscopical vision, shows as " no site " effect, it is backlight to be particularly suitable for transparent push.Described luminous zone for buttons such as mobile phone need luminous character area, also can be whole luminous zone, and specifically the requirement according to product designs.
The preparation method of press-key backlight light-guiding film of the present invention, set the degree of depth of each leaded light site earlier according to optical principle, the preparation metal die, adopt hot pressing or UV impression mode to prepare light guiding film again, the preparation method of described metal die adopts laser degree of deepening site etching, the preparation mother matrix obtains metal die by electroforming again.
In the technique scheme, described mother matrix adopts laser degree of deepening site etching on photoresist to form, and the coating thickness of photoresist is 10um～20um.Selectable photoresist comprises AZ glue, SU-8, dry film etc.; The laser wavelength that adopts is 405nm or 351nm, and power is generally at 50mw-100mw.
Perhaps, described mother matrix adopt laser directly on mold materials etching form.The mold materials that adopts is generally metallic nickel, also comprises materials such as can adopting PC/PMMA, and degree of deepening site etching obtains metal die by electroforming process more earlier; The laser wavelength that adopts is 351nm or 527nmDPSSL pulse laser.
In the technique scheme, described degree of deepening site etching is by changing laser instrument time for exposure or pulse number, to change the photoetching degree of depth.
The light guiding film that the present invention obtains can be applicable to the electronic product that all need key-press backlight, as mobile phone, notes computer, e-dictionary etc.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
(1) the light guiding film neighbour node is closely arranged, and after the LED illumination, visually shows as continuous homogeneous light emitting area in macroscopic view, the site is invisible, solved the luminous problem of pebble button transparent area, satisfied requirement attractive in appearance simultaneously, this existing discrete site light guiding film can't realize.
(2) existing light guiding film must be covered up the discrete site that has light guiding film now by the transparency that reduces button; And " no site " light guiding film of using the present invention to propose can improve the transparency of button, thereby can improve the luminosity of button.Perhaps, can select lower powered LED, reach identical luminosity, thereby reduce cost, energy savings.
(3) light guiding film of the present invention is by changing the site degree of depth, regulate the luminous uniformity, adopt laser lithography or lithographic method, having remedied existing printing process and only can change site density, diameter, and can not change the deficiency of the degree of depth.
(4) the employing laser lithography of the present invention's proposition or directly lithographic method making light guiding film mould, adopt hot pressing or UV impression mode to produce in batches, can solve the problem that injection molding technology can't be made ultra-thin light guiding film, simultaneously, has the production efficiency height, the advantage that yields is high.
Description of drawings
Fig. 1 is the light guiding film leaded light network point distribution schematic diagram among the embodiment one;
Fig. 2 is the light guide effect figure after the assembling of light guiding film and metal clips among the embodiment four.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one:
The site arrangement mode of existing light guiding film mainly contains two kinds, and (1) site becomes density and arranges; (2) becoming the site diameter arranges; As can be seen, the site of above arrangement mode is in a discrete distribution, and after the LED illumination, each luminous site is with high-visible.
Shown in accompanying drawing 1, closely arrange the adjacent leaded light site of present embodiment, and the network point distribution figure of certain mobile phone push-button light guiding film that designs in this mode is shown in Fig. 1 left side.Because of closely arranging each site, therefore, each light guide zone shows as a continuous light-emitting area.Each regional site degree of depth is difference along with the variation of LED luminosity curve.Amplify shown in Fig. 1 right side part wherein.Fig. 1 right upper portion is the regularly arranged signal in square site; Middle part figure is that signal is arranged in the dislocation of square site; Bottom graph is that signal is closely arranged in the rhombus site, all can realize " no site " light guide effect, and various possible dot shapes and solid matter mode are not limited thereto.Each leaded light site length of side is 10um～200um.
When the leaded light site is circular, the site diameter is not more than 40um, and closely arrange each site, and the luminous zone of the light guiding film of making shows as visual continuous face equally.
Embodiment two: the light guiding film Mold Making among the embodiment one, can adopt the laser lithography mode.Be coated with photoresist on substrate of glass, such as AZ glue or dry film, coating thickness is 10um-20um.
The laser instrument that uses can be 405nm semiconductor laser or 351nmDPSSL pulse laser.For the 405nm laser instrument, control the degree of depth of exposure by the control time for exposure; For the 351nm laser instrument, control exposure depth by control laser output pulse number.The photoetching depth bounds is usually at 1-20um.
After the respective regions exposure, develop, just form concave surface grooved, i.e. leaded light site on the photoresist surface.After making finishes, adopt electroforming process, will form metal die, selecting metallic nickel usually is mold materials, and the thickness of electroformed nickel mold materials is usually at 50um-150um; Being suitable for the road, back adopts concora crush or volume to volume impression mode to carry out the batch process of light guiding film.The light guiding film material is generally PC, and thickness can be 100um; 125um; 254um; 381um; Hot pressing mode is for directly impressing at the PC material; UV impression mode is earlier to solidify glue in PC film surface coating UV, after impress, remake the UV curing molding.
Embodiment three: the light guiding film Mold Making among the embodiment one, can adopt the direct etching mode of laser.The mould base material can be PC or nickel, and etching obtains the site trench structure.After making finishes, adopt electroforming process, will form metal die, selecting metallic nickel usually is mold materials.
The laser instrument that uses can be 527nm or 351nmDPSSL pulse laser.Control exposure depth by control laser output pulse number.The etching depth scope is usually at 1-20um.
Mould after the etching is a die, carry out the electroforming reprint after, can obtain punch.
The thickness of electroformed nickel mold materials is usually at 50um-150um; Being suitable for the road, back adopts concora crush or volume to volume impression mode to carry out the batch process of light guiding film.The light guiding film material is generally PC, and thickness can be 100um; 125um; 254um; 381um; Hot pressing mode is for directly impressing at the PC material; UV impression mode is earlier to solidify glue in PC film surface coating UV, after impress, remake the UV curing molding.
Embodiment four: the light guiding film that the site mode that adopts discrete density to change is made, the site is clear distinguishable when actual observation.If this mobile phone configuration pebble button, its lattice point structure in addition together with the metal clips of below with high-visible, the visual effect of the mobile phone of Jiang Diing greatly, especially high-grade brand mobile phone is unacceptable.
Present embodiment is backlight with a smart mobile phone transparent push to be example, the light guiding film of design, and according to distance L ED from the close-by examples to those far off, the degree of depth of its leaded light site micro-structural is and increases progressively, and concrete depth value satisfies the leaded light uniformity requirement.Adopt embodiment three described methods to make its light guiding film mould, adopt hot pressing mode,, make no site light guiding film at the PC of 125um thickness material surface.After itself and metal clips were assembled, the actual effect under the LED illumination was seen Fig. 2; The bottom is office's graph region enlarged photograph; As seen, the light-emitting zone of light guiding film does not have discrete site, and shows as continuous light-emitting area, has good visual effect, is applicable to transparent mobile phone key.
Need to prove, for the bright large-sized smart mobile phone button of full impregnated, can't adopt existing discrete site light guiding film, it is backlight only can to adopt tens of LEDs to arrange illumination, but LED direct illumination, will produce expensive, the consequence of high energy consumption.The use of the light guiding film of the no site of present embodiment will address the above problem.
Claims (8)
1. press-key backlight light-guiding film, mainly constitute by transparent light guide rete and the leaded light site that is arranged on the leaded light rete, it is characterized in that: described leaded light site is covered with in the luminous zone of leaded light rete, closely arrange adjacent leaded light site, the degree of depth of each leaded light site changes by optical principle according to the distance with light source, realizes even light-guiding.
2. press-key backlight light-guiding film according to claim 1 is characterized in that: described each leaded light site is a polygon, and the length of side is 10um～200um.
3. press-key backlight light-guiding film according to claim 1 is characterized in that: described each leaded light site is for circular, and diameter is 10um～40um.
4. press-key backlight light-guiding film according to claim 1 is characterized in that: the depth bounds of described each leaded light site is 1um～20um.
5. the preparation method of a press-key backlight light-guiding film, set the degree of depth of each leaded light site earlier according to optical principle, the preparation metal die, adopt hot pressing or UV impression mode to prepare light guiding film again, it is characterized in that: the preparation method of described metal die adopts laser degree of deepening site etching, the preparation mother matrix obtains metal die by electroforming again.
6. the preparation method of press-key backlight light-guiding film according to claim 5 is characterized in that: described mother matrix adopts laser degree of deepening site etching on photoresist to form, and the coating thickness of photoresist is 10um～20um.
7. the preparation method of press-key backlight light-guiding film according to claim 5 is characterized in that: described mother matrix adopt laser directly on mold materials etching form.
8. the preparation method of press-key backlight light-guiding film according to claim 5 is characterized in that: described degree of deepening site etching is by changing laser instrument time for exposure or pulse number, to change the photoetching degree of depth.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100282952A CN101476698A (en) | 2009-02-06 | 2009-02-06 | Press-key backlight light-guiding film and its production method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100282952A CN101476698A (en) | 2009-02-06 | 2009-02-06 | Press-key backlight light-guiding film and its production method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289026A (en) * | 2011-07-29 | 2011-12-21 | 深圳市迪美通讯设备有限公司 | Metal dome array (DOME) light guide film |
| CN103207429A (en) * | 2012-01-17 | 2013-07-17 | 扬昕科技(苏州)有限公司 | Light guide plate and manufacture method thereof |
| CN105891939A (en) * | 2016-06-20 | 2016-08-24 | 倪中生 | Novel injection molding light guide plate and machining process thereof |
| CN106950639A (en) * | 2017-04-11 | 2017-07-14 | 力纳克传动系统（深圳）有限公司 | A kind of method for designing of light guiding film |
| US10295728B2 (en) | 2014-10-23 | 2019-05-21 | Corning Incorporated | Light diffusing component and a method of manufacturing a light diffusing component |
-
2009
- 2009-02-06 CN CNA2009100282952A patent/CN101476698A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289026A (en) * | 2011-07-29 | 2011-12-21 | 深圳市迪美通讯设备有限公司 | Metal dome array (DOME) light guide film |
| CN103207429A (en) * | 2012-01-17 | 2013-07-17 | 扬昕科技(苏州)有限公司 | Light guide plate and manufacture method thereof |
| CN103207429B (en) * | 2012-01-17 | 2016-02-10 | 扬昕科技(苏州)有限公司 | Light guide plate and manufacture method thereof |
| US10295728B2 (en) | 2014-10-23 | 2019-05-21 | Corning Incorporated | Light diffusing component and a method of manufacturing a light diffusing component |
| CN105891939A (en) * | 2016-06-20 | 2016-08-24 | 倪中生 | Novel injection molding light guide plate and machining process thereof |
| CN106950639A (en) * | 2017-04-11 | 2017-07-14 | 力纳克传动系统（深圳）有限公司 | A kind of method for designing of light guiding film |
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Application publication date: 20090708 |