CN2745289Y - 手机按键导光板 - Google Patents

手机按键导光板 Download PDF

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Publication number
CN2745289Y
CN2745289Y CNU2004200950203U CN200420095020U CN2745289Y CN 2745289 Y CN2745289 Y CN 2745289Y CN U2004200950203 U CNU2004200950203 U CN U2004200950203U CN 200420095020 U CN200420095020 U CN 200420095020U CN 2745289 Y CN2745289 Y CN 2745289Y
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light guide
light
guide plate
guiding surface
shaped groove
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Expired - Fee Related
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CNU2004200950203U
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English (en)
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许东明
郑文峰
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Shenzhen Futaihong Precision Industry Co Ltd
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Shenzhen Futaihong Precision Industry Co Ltd
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Priority to CNU2004200950203U priority Critical patent/CN2745289Y/zh
Priority to US11/265,366 priority patent/US7407314B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/044—Edge lighting of layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/06—Reflector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/062—Light conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/054—CAD

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

本实用新型提供一种手机按键导光板，其上分布多个与按键相对应的孔，孔或槽的侧壁上设有导光面，在导光板底部开有V形槽，靠近V形槽的导光面的入射角大于入射光的全反射临界角，远离V形槽的导光面的入射角小于靠近V形槽的导光面的入射角。该手机按键导光板可将光进行有效的分光处理，使导光板可均匀的将光传递给每个按键，不仅减少手机耗电量，也减少了LED光源的使用量。

Description

手机按键导光板
【技术领域】
本实用新型涉及一种手机按键导光板。
【背景技术】
在手机设计中，为使其在黑暗中仍可使用，常采用手机按键照明设计，一般采用发光二极管(light-emitting diode，以下简称LED)作为灯源，将该LED置于手机PCB板上，直接射向按键数字上的所需发光处，因此要使每一个按键都能够发出均匀的亮度，在LED数量的控制上便随着设计的不同而有不同的需求量，一般最少的使用数目也得在4-5颗上，不仅增加了成本，此外，也增加了手机的整体耗电量。
为了减少LED光源数量和成本，常采用导光板的形式来传递及均化光。现有技术如公告于1992年1月21日的美国专利第5,083,240号，采用导光板来作为光源。该导光板的四个边上设置多个V形槽，导光板表面均匀设置有多个孔，该孔为带有圆角的矩形孔，每个孔与键盘上的按键相对应。多个LED光源位于导光板下面，在与LED光源相对应之处，设置有凸透镜，凸透镜周围有四个斜面，LED光源的光经过凸透镜汇聚，在经过周围的斜面反射，从而将光反射到导光板面上。该导光板的设计虽可照明按键，但是仍需多个LED光源，且采用凸透镜也增加了制造的难度。
鉴于以上的缺点，提供一种减少手机耗电量和LED使用量的手机按键导光板，非常必要。
【实用新型内容】
本实用新型的目的在于提供一种减少手机耗电量和LED使用量的手机按键导光板。
本实用新型手机按键导光板，其上分布多个与按键相对应的孔，在导光板底部一端开有V形槽，每个孔侧壁上部分设有导光面，靠近V形槽的导光面的入射角大于入射光的全反射临界角，远离V形槽的导光面的入射角小于靠近V形槽的导光面的入射角。
本实用新型手机按键导光板，其上分布多个与按键相对应的孔，在导光板底部一端开有V形槽，在每个孔之间设置多个槽，每个槽设有导光面，靠近V形槽的导光面的入射角大于入射光的全反射临界角，远离V形槽的导光面的入射角小于靠近V形槽的导光面的入射角。
与现有技术相比，本实用新型手机按键导光板可减少LED使用量及手机耗电量，同时可防止热点效应(hot spot)，以均匀光线。
【附图说明】
图1是本实用新型手机按键导光板的立体图；
图2是本实用新型手机按键导光板的光路示意图；
图3是本实用新型孔的平面导光面光路反射示意图；
图4是本实用新型孔的平面导光面光路反射示意图。
【具体实施方式】
本实用新型手机按键导光板20应用于手机按键照明中。请参见图1，该手机按键导光板20需一个LED光源10，通过于导光板20表面开设一定形状的孔，而将光依次传递到远端，从而使各个光能均匀的从各个孔中发散出来。
手机按键导光板20的底部一端设置一V形槽21，该V形槽21优选的角度为70-90度之间。该V形槽21可对光进行有效的分光处理，避免光直接入射于最接近于光源的按键，造成光源入口处热点效应，也防止了光往后不被向后传递的可能。
请参见图2，导光板20的表面设置多个孔22，该孔22的位置与所要照射的按键相对应，孔22的大小要保证每个按键可穿过所述的孔22，每个孔22的侧壁部分作为透射面，部分作为导光面。透射面将光传递至孔中，以便照亮按键，而导光面则将光反射出，以传递到其它孔。距离V形槽21较近处，孔22的导光面设计成具较大的入射角，即大于LED光源10所发出的入射光的全反射临界角，使入射光能够全反射引导至远端。远离LED光源10处，因为光经多次全反射后，行进的角度就变得较为窄小，此时孔22导光面设计的入射角也相应变小，从而使整个光均匀的引导到远端。图2中仅以一条光线为例，该光线入射到孔22上，其入射角为α角，因该孔22有较大的入射角，该α角为大于入射光的全反射临界角，因此该光线在该孔22上全反射到下一个孔22，从而依次将光传递到远端；而由于孔22之侧壁一部分作为透射面，在光于反射过程中，将也有部分透射入孔22中，而照亮孔22中的按键。
在每个孔22的设计上，请参见图3至图4，孔22的导光面可分为平面或圆弧面，平面的设计可将光引导至单一固定的方向，如图3的导光面31。圆弧面的设计因圆弧上每一点的切线斜率均不同，因此引导的方向也较为不固定，可参见图4的导光面33。
本方案的另一实施例，是在导光板20的表面设置多个圆形孔，该圆形孔的位置与所要照射的按键相对应。每个圆形孔的侧壁可作为透射面，将光传递给按键，以便照亮按键。在导光板的底部一端设置一V形槽，其作用与上一实施例相同。在每个圆形孔之间均匀设置多个槽，每个槽上设有导光面，该槽与V形槽较近处，导光面设计成较大的入射角，大于LED光源10的入射光的全反射临界角，与V形槽较远处，导光面入射角变小，该设计保证将光均匀的引导到远端。槽的导光面可分为平面和圆弧面，具体原理与上一实施例相同。
导光板20的材料采用聚碳酸酯(Polycarbonate，以下简称PC)或聚甲基丙烯酸甲酯(Polymethyl-Methacrylate，以下简称PMMA)，其厚度约为0.8-1.2mm。
使用时，LED光源10位于V形槽21处，在槽的作用下，将光座有效的分配及引导，使光没有被聚集于近光源处，而被传递到远处。

Claims (7)

1.一种手机按键导光板，其上分布多个与按键相对应的孔，其特征在于：在导光板底部一端开有V形槽，每个孔的侧壁上部分设为透射面，部分设为导光面，靠近V形槽的导光面的入射角大于入射光的全反射临界角，远离V形槽的导光面的入射角小于靠近V形槽的导光面的入射角。
2.一种手机按键导光板，其上分布多个与按键相对应的孔，其特征在于：在导光板底部一端开有V形槽，在每个孔之间设置多个槽，每个槽设有导光面，靠近V形槽的导光面的入射角大于入射光的全反射临界角，远离V形槽的导光面入射角小于靠近V形槽的导光面的入射角。
3.如权利要求1所述的手机按键导光板，其特征在于：孔的导光面为圆弧面和平面。
4.如权利要求2所述的手机按键导光板，其特征在于：槽的导光面为圆弧面和平面。
5.如权利要求3或4所述的手机按键导光板，其特征在于：该V形槽的角度为70-90度。
6.如权利要求5所述的手机按键导光板，其特征在于：该导光板的材料为聚碳酸酯PC或聚甲基丙烯酸甲酯PMMA。
7.如权利要求6所述的手机按键导光板，其特征在于：该导光板的厚度为0.8-1.2mm。
CNU2004200950203U 2004-11-04 2004-11-04 手机按键导光板 Expired - Fee Related CN2745289Y (zh)

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US11/265,366 US7407314B2 (en) 2004-11-04 2005-11-01 Keypad light guide

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WO2008134988A1 (en) * 2007-05-08 2008-11-13 Taiyen Lin Light guiding structure and manufacturing of the same
CN101206965B (zh) * 2006-12-21 2010-08-11 光宝科技股份有限公司 具有导光元件的可携式电子装置
CN102272693A (zh) * 2008-11-11 2011-12-07 惠普开发有限公司 键盘照明装置和方法
CN105425331A (zh) * 2015-09-01 2016-03-23 苏州达方电子有限公司 背光模组及其导光板
US9664837B2 (en) 2014-11-19 2017-05-30 Darfon Electronics Corp. Light emission module and light guide plate and manufacturing method thereof
TWI607471B (zh) * 2015-08-21 2017-12-01 達方電子股份有限公司 背光模組

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CN101206965B (zh) * 2006-12-21 2010-08-11 光宝科技股份有限公司 具有导光元件的可携式电子装置
WO2008134988A1 (en) * 2007-05-08 2008-11-13 Taiyen Lin Light guiding structure and manufacturing of the same
CN102272693A (zh) * 2008-11-11 2011-12-07 惠普开发有限公司 键盘照明装置和方法
CN102272693B (zh) * 2008-11-11 2015-12-16 惠普开发有限公司 键盘照明装置和方法
US9664837B2 (en) 2014-11-19 2017-05-30 Darfon Electronics Corp. Light emission module and light guide plate and manufacturing method thereof
TWI607471B (zh) * 2015-08-21 2017-12-01 達方電子股份有限公司 背光模組
US9983346B2 (en) 2015-08-21 2018-05-29 Darfon Electronics (Suzhou) Co., Ltd. Backlight module and light guide plate thereof
CN105425331A (zh) * 2015-09-01 2016-03-23 苏州达方电子有限公司 背光模组及其导光板

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US7407314B2 (en) 2008-08-05

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