CN110423570A - 适用于超声波指纹识别功能的钢化玻璃保护膜 - Google Patents

适用于超声波指纹识别功能的钢化玻璃保护膜 Download PDF

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CN110423570A
CN110423570A CN201910746165.6A CN201910746165A CN110423570A CN 110423570 A CN110423570 A CN 110423570A CN 201910746165 A CN201910746165 A CN 201910746165A CN 110423570 A CN110423570 A CN 110423570A
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protective film
microns
tempered glass
glue
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CN110423570B (zh
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温志光
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SHENZHEN TAIJI PHOTOELECTRIC Co Ltd
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SHENZHEN TAIJI PHOTOELECTRIC Co Ltd
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Priority to CN201910746165.6A priority Critical patent/CN110423570B/zh
Priority to JP2019201111A priority patent/JP6803445B1/ja
Priority to US16/675,324 priority patent/US20210046735A1/en
Publication of CN110423570A publication Critical patent/CN110423570A/zh
Priority to EP19209397.9A priority patent/EP3778814A1/en
Priority to PCT/CN2019/124925 priority patent/WO2021027203A1/zh
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Abstract

本发明公开了一种适用于超声波指纹识别功能的钢化玻璃保护膜，以解决在电子设备使用钢化玻璃保护膜后超声波指纹传感器收到的回波能量低、导致的无法获得清晰指纹图像的技术问题。从上到下所述钢化玻璃保护膜依次包括玻璃层、第一胶层和第二胶层，所述第一胶层为OCA胶层，所述第二胶层为硅胶层或PU胶层，其中，从边沿到中心所述OCA胶层的厚度逐渐减小，相应地，从边沿到中心所述钢化玻璃保护膜的厚度逐渐减小。本钢化玻璃保护膜在提高超声波指纹传感器接收到的回波能量的同时仍具有较好的抗冲击性能。

Description

适用于超声波指纹识别功能的钢化玻璃保护膜
技术领域
本发明涉及电子设备保护膜，尤其是一种适用于超声波指纹识别功能的钢化玻璃保护膜。
背景技术
电子设备保护膜被广泛用在智能手机、平板电脑、IPAD等，用于保护电子设备的屏幕。目前，电子设备保护膜大致分为普通保护膜和钢化玻璃保护膜，二者都可防止电子设备的屏幕被刮花。相比普通保护膜，钢化玻璃保护膜具有硬度高和韧性低的特点，因而具有更好的抗冲击性能，可以在电子设备掉落后保护屏幕，防止屏幕损坏。
指纹作为一种生物特征，具备唯一性，被广泛用来验证身份，并且已经被用在一些智能手机、平板电脑、IPAD等电子设备中，用于解锁这些电子设备。指纹传感器用来采集指纹，其可分为：接触式和非接触式。接触式指纹传感器是将手指按压在采集窗口来识别指纹。非接触式指纹传感器目前主要有超声波指纹传感器，它是通过发射并检测反射回来的超声波识别指纹。由于超声波具有穿透性，可以穿透电子设备的外壳，因此，超声波指纹传感器即使设置在电子设备的外壳内也可以识别指纹，这样无需在电子设备的外壳设置指纹采集窗口，可以增加电子设备外观的美观度。
综上可见，相比普通保护膜和接触式指纹传感器，钢化玻璃保护膜和超声波指纹传感器在智能手机、平板电脑、IPAD等电子设备中的应用具有非常明显的优点。但是，二者很难共同应用在这类电子设备上，主要原因在于：超声波穿透钢化玻璃保护膜的能力较弱，超声波指纹传感器发射的超声波只有一小部分能够穿透钢化玻璃保护膜到达手指，而被手指反射后，能够反向再次穿透钢化玻璃保护膜返回到超声波指纹传感器的超声波就更少，这将导致无法获得清晰的指纹图像。
发明内容
本发明的目的是提供一种适用于超声波指纹识别功能的钢化玻璃保护膜，以解决在电子设备使用钢化玻璃保护膜后超声波指纹传感器收到的回波能量低、导致的无法获得清晰指纹图像的技术问题。
为达上述目的，本发明采用的技术方案如下：
一种适用于超声波指纹识别功能的钢化玻璃保护膜，从上到下所述钢化玻璃保护膜依次包括玻璃层、第一胶层和第二胶层，所述第一胶层为OCA(Optically ClearAdhesive)胶层，所述第二胶层为硅胶层或PU胶层，其中，从边沿到中心所述OCA胶层的厚度逐渐减小，相应地，从边沿到中心所述钢化玻璃保护膜的厚度逐渐减小。
优选地，所述OCA胶层的中心厚度介于50微米至90微米之间，所述OCA胶层的边沿厚度介于250微米至350微米之间，所述钢化玻璃保护膜的中心厚度介于350微米至420微米之间，所述钢化玻璃保护膜的边沿厚度介于500微米至600微米之间。
优选地，所述玻璃层的厚度均匀且介于100微米至300微米之间，所述第二胶层的厚度均匀且介于15微米至20微米之间。
优选地，所述OCA胶层和所述第二胶层之间还具有PC(Polycarbonate，聚碳酸酯)层或PET层，所述PC层或所述PET层的厚度均匀且介于30微米至50微米之间。
更优选地，所述OCA胶层的中心厚度为80微米，所述OCA胶层的边沿厚度为300微米，所述玻璃层的厚度为200微米，所述PC层或所述PET层的厚度为38微米，所述第二胶层的厚度为20微米。
优选地，所述玻璃层的上表面附着有第一离型膜，所述第二胶层的下表面附着有第二离型膜。
优选地，所述第一离型膜为PET膜、PE膜、PP膜和PVC膜中的一种，所述第二离型膜为PET膜、PE膜、PP膜和PVC膜中的一种。
优选地，所述第一离型膜的剥离力介于3gf至6gf之间，所述第二离型膜的剥离力介于3gf至6gf之间。
与现有技术相比，本发明至少具有以下有益效果：
本钢化玻璃保护膜的中部薄、边沿厚，使用时超声波经本钢化玻璃保护膜的中部在超声波指纹传感器和手指之间传递，较薄的中部有效地提高了超声波指纹传感器接收到的回波的能量，从而使超声波指纹传感器能够获得清晰的指纹图像，同时较厚的边沿保证了较好的抗冲击性能，可以在电子设备掉落后保护屏幕，防止屏幕损坏。
附图说明
图1为钢化玻璃保护膜第一实施例的结构示意图；
图2为钢化玻璃保护膜第二实施例的结构示意图；
图3为钢化玻璃保护膜第三实施例的结构示意图；
图4为钢化玻璃保护膜第四实施例的结构示意图；
附图标记：1、硅胶层；2、PC层；3、OCA层；4、玻璃层；5、第一离型膜；6、第二离型膜。
具体实施方式
下面结合附图和实施例对本发明做进一步说明。
本发明通过将钢化玻璃保护膜的OCA层做成中间薄边沿厚的渐变结构，使得整个钢化玻璃保护膜的中间薄、边沿厚。使用时，超声波经本钢化玻璃保护膜的中部在超声波指纹传感器和手指之间传递，较薄的中部有效提高了超声波指纹传感器接收到的回波的能量，从而使超声波指纹传感器能够获得清晰的指纹图像，同时较厚的边沿保证了较好的抗冲击性能，可以在电子设备掉落后保护屏幕，防止屏幕损坏。
本发明中的钢化玻璃保护膜可以是贴附在电子设备的显示屏的保护膜，也可以是贴附在电子设备的背部的保护膜。
第一实施例：
图1中示意性表示了本适用于超声波指纹识别功能的钢化玻璃保护膜的结构。如图1所示，从上到下本钢化玻璃保护膜依次包括玻璃层4、OCA胶层3、PC层2和硅胶层1，各层之间紧密贴合并粘结成为一个整体，重要的是，从边沿到中心OCA胶层3的厚度逐渐减小，相应地，从边沿到中心整个钢化玻璃保护膜的厚度逐渐减小。使用时硅胶层1与电子设备的表面贴合。
第一实施例中，整个钢化玻璃保护膜的底面(用于贴合电子设备的表面)为平面结构，顶面为凹弧面结构，适用于表面为平面的电子设备。
上述钢化玻璃保护膜的一种制备方法如下：在PC膜(该PC膜构成上述PC层2)的第一面涂布硅胶，烘干后制得硅胶层1，然后在PC膜的第二面涂布OCA胶，烘干后制得OCA胶层3，然后将玻璃粘结于OCA胶层3，即制得该钢化玻璃保护膜。涂布工艺可采用凹版涂布、刮刀涂布、挤出涂布、狭缝涂布。烘干优选在烘箱中100至130摄氏度下烘干。OCA胶是一种用于胶结透明光学元件的光学胶，透光率在90％以上，可在室温或中温下固化。
钢化玻璃保护膜的中心厚度优选350微米至420微米，钢化玻璃保护膜的边沿厚度优选500微米至600微米。其中，OCA胶层3的中心厚度优选50微米至90微米，OCA胶层3的边沿厚度优选250微米至350微米。玻璃层4的厚度均匀且优选100微米至300微米，硅胶层1的厚度均匀且优选15微米至20微米。PC层2的厚度均匀且优选30微米至50微米。在该规格下，钢化玻璃保护膜兼具较佳的超声波穿性能和较佳的抗冲击性能。
OCA胶层3的中心厚度更优选80微米，OCA胶层3的边沿厚度更优选300微米，玻璃层4的厚度更优选200微米，PC层2的厚度更优选38微米，硅胶层1的厚度更优选20微米。
第二实施例：
请参照图2，第二实施例的钢化玻璃保护膜是在第一实施例的基础上，进一步在玻璃层4的上表面粘结有第一离型膜5，在硅胶层1的下表面粘结有第二离型膜6。
第一离型膜5可以采用PET膜、PE膜、PP膜或PVC膜，优选PP膜，厚度优选40微米至90微米，第一离型膜5的剥离力优选3gf至6gf。同样，第二离型膜6也可以采用PET膜、PE膜、PP膜或PVC膜，优选PP膜，厚度优选40微米至90微米，第二离型膜6的剥离力优选3gf至6gf。
第一离型膜5和第二离型膜6用于在将钢化玻璃保护膜贴覆至电子设备前，保护玻璃层4的表面和硅胶层1的表面。在使用时，首先剥离第二离型膜6，将硅胶层1贴覆至电子设备的屏幕，然后再剥离第一离型膜5。
第三实施例：
请参照图3，第三实施例与第一实施例具有相同的层状结构，即，从上到下本钢化玻璃保护膜依次包括玻璃层4、OCA胶层3、PC层2和硅胶层1，各层之间紧密贴合并粘结成为一个整体，从边沿到中心所述OCA胶层3的厚度逐渐减小，相应地，从边沿到中心整个钢化玻璃保护膜的厚度逐渐减小。与第一实施例的区别在于，第三实施例中，整个钢化玻璃保护膜的底面(用于贴合电子设备的表面)为凹弧面结构，适用于表面为曲面的电子设备，如曲面屏手机。
第四实施例：
请参照图4，第四实施例的钢化玻璃保护膜是在第三实施例的基础上，进一步在玻璃层4的上表面粘结有第一离型膜5，在硅胶层1的下表面粘结有第二离型膜6。
上述通过具体实施例对本发明进行了详细的说明，这些详细的说明仅仅限于帮助本领域技术人员理解本发明的内容，并不能理解为对本发明保护范围的限制。本领域技术人员在本发明构思下对上述方案进行的各种润饰、等效变换等均应包含在本发明的保护范围内。

Claims (8)

1.一种适用于超声波指纹识别功能的钢化玻璃保护膜，从上到下所述钢化玻璃保护膜依次包括玻璃层、第一胶层和第二胶层，所述第一胶层为OCA胶层，所述第二胶层为硅胶层或PU胶层，其特征在于：从边沿到中心所述OCA胶层的厚度逐渐减小，相应地，从边沿到中心所述钢化玻璃保护膜的厚度逐渐减小。
2.根据权利要求1所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述OCA胶层的中心厚度介于50微米至90微米之间，所述OCA胶层的边沿厚度介于250微米至350微米之间，所述钢化玻璃保护膜的中心厚度介于350微米至420微米之间，所述钢化玻璃保护膜的边沿厚度介于500微米至600微米之间。
3.根据权利要求2所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述玻璃层的厚度均匀且介于100微米至300微米之间，所述第二胶层的厚度均匀且介于15微米至20微米之间。
4.根据权利要求3所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述OCA胶层和所述第二胶层之间还具有PC层或PET层，所述PC层或所述PET层的厚度均匀且介于30微米至50微米之间。
5.根据权利要求4所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述OCA胶层的中心厚度为80微米，所述OCA胶层的边沿厚度为300微米，所述玻璃层的厚度为200微米，所述PC层或所述PET层的厚度为38微米，所述第二胶层的厚度为20微米。
6.根据权利要求1所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述玻璃层的上表面附着有第一离型膜，所述第二胶层的下表面附着有第二离型膜。
7.根据权利要求6所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述第一离型膜为PET膜、PE膜、PP膜和PVC膜中的一种，所述第二离型膜为PET膜、PE膜、PP膜和PVC膜中的一种。
8.根据权利要求7所述的适用于超声波指纹识别功能的钢化玻璃保护膜，其特征在于，所述第一离型膜的剥离力介于3gf至6gf之间，所述第二离型膜的剥离力介于3gf至6gf之间。
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