WO2021027203A1 - 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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Publication number
WO2021027203A1
WO2021027203A1 PCT/CN2019/124925 CN2019124925W WO2021027203A1 WO 2021027203 A1 WO2021027203 A1 WO 2021027203A1 CN 2019124925 W CN2019124925 W CN 2019124925W WO 2021027203 A1 WO2021027203 A1 WO 2021027203A1
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Prior art keywords
protective film
layer
microns
adhesive layer
glass protective
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PCT/CN2019/124925
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English (en)
French (fr)
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温志光
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深圳市台技光电有限公司
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Publication of WO2021027203A1 publication Critical patent/WO2021027203A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10091—Properties of the bulk of a glass sheet thermally hardened
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    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
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    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
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    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger
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    • C—CHEMISTRY; METALLURGY
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    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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    • C—CHEMISTRY; METALLURGY
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    • C—CHEMISTRY; METALLURGY
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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    • C—CHEMISTRY; METALLURGY
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Definitions

  • the invention relates to a protective film for electronic equipment, in particular to a protective film for toughened glass suitable for ultrasonic fingerprint identification.
  • Electronic device protective films are widely used in smart phones, tablet computers, IPADs, etc. to protect the screens of electronic devices.
  • electronic device protective films are roughly divided into ordinary protective films and tempered glass protective films, both of which can prevent the screen of the electronic device from being scratched.
  • tempered glass protective film has the characteristics of high hardness and low toughness, so it has better impact resistance. It can protect the screen and prevent damage to the screen after the electronic device is dropped.
  • fingerprints are unique and are widely used to verify identities, and have been used in some electronic devices such as smart phones, tablets, and IPADs to unlock these electronic devices.
  • the fingerprint sensor is used to collect fingerprints, which can be divided into: contact type and non-contact type.
  • the contact fingerprint sensor is to press the finger on the collection window to identify the fingerprint.
  • Non-contact fingerprint sensors currently mainly include ultrasonic fingerprint sensors, which identify fingerprints by emitting and detecting the reflected ultrasonic waves.
  • the ultrasonic fingerprint sensor can recognize fingerprints even if it is installed in the shell of the electronic device, so there is no need to set a fingerprint collection window on the shell of the electronic device, which can increase the appearance of the electronic device The aesthetics.
  • tempered glass protective films and ultrasonic fingerprint sensors have obvious advantages in the application of smart phones, tablet computers, IPAD and other electronic devices.
  • the main reason is that the ability of ultrasonic waves to penetrate the protective film of tempered glass is weak, and only a small part of the ultrasonic waves emitted by the ultrasonic fingerprint sensor can penetrate the protective film of tempered glass to reach the finger. , And after being reflected by the finger, there will be less ultrasonic waves that can penetrate the tempered glass protective film and return to the ultrasonic fingerprint sensor again, which will result in the inability to obtain a clear fingerprint image.
  • the purpose of the present invention is to provide a toughened glass protective film suitable for the ultrasonic fingerprint identification function, so as to solve the problem of the low echo energy received by the ultrasonic fingerprint sensor after the electronic equipment uses the toughened glass protective film, resulting in the inability to obtain a clear fingerprint image. technical problem.
  • the toughened glass protective film suitable for ultrasonic fingerprint recognition. From top to bottom, the toughened glass protective film includes a glass layer, a first adhesive layer, and a second adhesive layer.
  • the first adhesive layer is Optically Clear (OCA).
  • Adhesive Adhesive
  • Adhesive Adhesive
  • the second adhesive layer is a silica gel layer or a PU adhesive layer, wherein the thickness of the OCA adhesive layer gradually decreases from the edge to the center, and accordingly, the tempered glass protective film from the edge to the center The thickness gradually decreases.
  • the central thickness of the OCA adhesive layer is between 50 microns and 90 microns
  • the edge thickness of the OCA adhesive layer is between 250 microns and 350 microns
  • the central thickness of the tempered glass protective film is between Between 350 micrometers and 420 micrometers
  • the edge thickness of the tempered glass protective film is between 500 micrometers and 600 micrometers.
  • the thickness of the glass layer is uniform and between 100 microns and 300 microns, and the thickness of the second adhesive layer is uniform and between 15 microns and 20 microns.
  • PC Polycarbonate, polycarbonate
  • PET PET layer
  • the thickness of the PC layer or the PET layer is uniform and ranges from 30 microns to Between 50 microns.
  • the central thickness of the OCA glue layer is 80 microns
  • the edge thickness of the OCA glue layer is 300 microns
  • the thickness of the glass layer is 200 microns
  • the thickness of the PC layer or the PET layer is 38 microns
  • the thickness of the second adhesive layer is 20 microns.
  • a first release film is attached to the upper surface of the glass layer, and a second release film is attached to the lower surface of the second adhesive layer.
  • the first release film is one of PET film, PE film, PP film and PVC film
  • the second release film is one of PET film, PE film, PP film and PVC film
  • the peeling force of the first release film is between 3 gf and 6 gf
  • the peeling force of the second release film is between 3 gf and 6 gf.
  • the present invention has at least the following beneficial effects:
  • the middle part of the tempered glass protective film is thin and the edges are thick.
  • ultrasonic waves are transmitted between the ultrasonic fingerprint sensor and the finger through the middle part of the tempered glass protective film.
  • the thinner middle part effectively improves the echo received by the ultrasonic fingerprint sensor. Energy, so that the ultrasonic fingerprint sensor can obtain a clear fingerprint image, while the thicker edges ensure better impact resistance, which can protect the screen and prevent damage to the screen when the electronic device falls.
  • FIG. 1 is a schematic diagram of the structure of the first embodiment of the tempered glass protective film
  • Figure 2 is a schematic structural view of a second embodiment of a protective film for toughened glass
  • Fig. 3 is a schematic structural diagram of a third embodiment of a protective film for tempered glass
  • FIG. 4 is a schematic diagram of the structure of the fourth embodiment of the tempered glass protective film
  • the OCA layer of the tempered glass protective film is made into a gradual structure with a thin middle edge and a thicker edge, so that the entire tempered glass protective film has a thin middle and thick edges.
  • ultrasonic waves are transmitted between the ultrasonic fingerprint sensor and the finger through the middle part of the tempered glass protective film.
  • the thinner middle part effectively increases the energy of the echo received by the ultrasonic fingerprint sensor, so that the ultrasonic fingerprint sensor can obtain a clear fingerprint.
  • the image, while the thicker edges ensure better impact resistance, which can protect the screen and prevent damage to the screen when the electronic device is dropped.
  • the tempered glass protective film in the present invention may be a protective film attached to the display screen of an electronic device, or a protective film attached to the back of the electronic device.
  • Fig. 1 schematically shows the structure of the tempered glass protective film suitable for the ultrasonic fingerprint recognition function.
  • the tempered glass protective film from top to bottom includes glass layer 4, OCA glue layer 3, PC layer 2 and silica gel layer 1.
  • the layers are closely attached and bonded to form a whole.
  • the important thing is ,
  • the thickness of the OCA adhesive layer 3 gradually decreases from the edge to the center, and accordingly, the thickness of the entire tempered glass protective film gradually decreases from the edge to the center.
  • the silica gel layer 1 is attached to the surface of the electronic device.
  • the bottom surface of the entire tempered glass protective film (the surface for bonding the electronic device) has a flat structure
  • the top surface has a concave arc surface structure, which is suitable for electronic devices with a flat surface.
  • a preparation method of the above-mentioned toughened glass protective film is as follows: Coat silica gel on the first side of the PC film (the PC film constitutes the above PC layer 2), dry the silica gel layer 1, and then apply the silica gel layer 1 on the second side of the PC film.
  • the OCA glue is coated and dried to obtain the OCA glue layer 3, and then the glass is bonded to the OCA glue layer 3 to produce the tempered glass protective film.
  • the coating process can adopt gravure coating, knife coating, extrusion coating, and slit coating.
  • the drying is preferably dried in an oven at 100 to 130 degrees Celsius.
  • OCA glue is a kind of optical glue used to glue transparent optical elements.
  • the light transmittance is above 90% and can be cured at room temperature or medium temperature.
  • the central thickness of the tempered glass protective film is preferably 350 micrometers to 420 micrometers, and the edge thickness of the tempered glass protective film is preferably 500 micrometers to 600 micrometers.
  • the central thickness of the OCA adhesive layer 3 is preferably 50 ⁇ m to 90 ⁇ m, and the edge thickness of the OCA adhesive layer 3 is preferably 250 ⁇ m to 350 ⁇ m.
  • the thickness of the glass layer 4 is uniform and preferably 100 to 300 microns, and the thickness of the silica gel layer 1 is uniform and preferably 15 to 20 microns.
  • the thickness of the PC layer 2 is uniform and preferably 30 to 50 microns.
  • the toughened glass protective film has both better ultrasonic penetration and better impact resistance.
  • the central thickness of the OCA adhesive layer 3 is more preferably 80 microns, the edge thickness of the OCA adhesive layer 3 is more preferably 300 microns, the thickness of the glass layer 4 is more preferably 200 microns, the thickness of the PC layer 2 is more preferably 38 microns, and the thickness of the silica gel layer 1 is even greater. Preferably it is 20 microns.
  • the tempered glass protective film of the second embodiment is based on the first embodiment, and is further bonded with a first release film 5 on the upper surface of the glass layer 4, and on the lower surface of the silica gel layer 1. With a second release film 6.
  • the first release film 5 can be a PET film, a PE film, a PP film, or a PVC film, preferably a PP film, and the thickness is preferably 40 micrometers to 90 micrometers, and the peeling force of the first release film 5 is preferably 3 gf to 6 gf.
  • the second release film 6 can also be a PET film, a PE film, a PP film or a PVC film, preferably a PP film, the thickness is preferably 40 to 90 microns, and the peeling force of the second release film 6 is preferably 3 gf to 6 gf.
  • the first release film 5 and the second release film 6 are used to protect the surface of the glass layer 4 and the surface of the silica gel layer 1 before attaching the tempered glass protective film to the electronic device.
  • the second release film 6 is first peeled off, the silicone layer 1 is attached to the screen of the electronic device, and then the first release film 5 is peeled off.
  • the third embodiment has the same layered structure as the first embodiment, that is, from top to bottom, the tempered glass protective film includes a glass layer 4, an OCA glue layer 3, a PC layer 2 and a silica gel layer 1 in sequence.
  • the layers are closely attached and bonded into a whole, and the thickness of the OCA adhesive layer 3 gradually decreases from the edge to the center, and correspondingly, the thickness of the entire tempered glass protective film gradually decreases from the edge to the center.
  • the bottom surface of the entire tempered glass protective film (the surface for bonding electronic equipment) is a concave arc surface structure, which is suitable for electronic equipment with a curved surface, such as a curved screen Cell phone.
  • the tempered glass protective film of the fourth embodiment is on the basis of the third embodiment, and is further bonded with a first release film 5 on the upper surface of the glass layer 4, and on the lower surface of the silicone layer 1. With a second release film 6.

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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 Clear Adhesive)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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