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Cover member, and portable information terminal provided with cover member and display device
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一种构件、罩盖的技术，应用在便携信息终端及显示装置领域，能够解决误认率升高等问题
Active Publication Date: 2021-08-13
AGC INC
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[0005] However, the capacitive sensor has a problem that the authentication sensitivity is affected by the state of the object to be detected, as in the case of wet hands, and there is a problem that the false positive rate increases.
Method used
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example 1～14、 example 16～19
[0118] With regard to Examples 1 to 14 and Examples 16 to 19 shown in Table 1 and Table 2, respectively, in order to obtain the glass shown in mole mass %, oxides, hydroxides, carbonates, nitrates, etc., which are generally used Glass raw materials were appropriately selected and mixed, and weighed so as to be 1000 g as glass.
[0119] Next, the mixed raw materials were put into a platinum crucible, put into a resistance heating electric furnace at 1500 to 1800° C., and melted, degassed, and homogenized for about 4 hours. The obtained molten glass was poured into the molded material and kept at a temperature equal to or higher than the glass transition point for 1 hour, and then cooled to room temperature at a rate of 1° C. / min to obtain a glass block. This glass block was cut and ground, and finally both surfaces were processed into mirror surfaces to obtain plate-shaped glass with a size of 50 mm×50 mm and a thickness of 0.5 mm.
example 15
[0121] Quartz glass manufactured by Asahi Glass Co., Ltd. was processed into a sheet glass having a size of 50 mm×50 mm and a thickness of 0.5 mm. Use it as Example 15.
[0122] About the sheet glass of Examples 1-7, the chemical strengthening process was given, and the chemical strengthening glass of Examples 1-7 was obtained. As chemical strengthening conditions, glass was immersed in 100% potassium nitrate molten salt of 425-450 degreeC for 1-6 hours.
[0123] For the chemically strengthened glasses of Examples 1 to 7 and the glasses of Examples 8 to 19, measure or calculate the density (unit: kg / m 3 ), Young's modulus (unit GPa), compressive stress value (unit MPa), compressive stress layer depth (unit μm), sound velocity (unit m / s), acoustic impedance (unit ×10 6 kg / m 2 / s), the results are shown in Table 1 and Table 2.
[0124] [Table 1]
[0125]
[0126] [Table 2]
[0127]
[0128] Take the chemically strengthened glass of Examples 1-7 and the glass of Examp...
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Abstract
Provided are a cover member, a portable information terminal provided with the cover member and a display device. The cover member comprises a first main surface and a second main surface on the side on which an ultrasonic device is arranged, and the cover member is characterized in that the cover member has a member having an acoustic impedance Z of 3-25 (* 10<6> kg / m<2> / s).
Description
[0001] This application is a divisional application of an invention patent application with an application date of August 31, 2017, an application number of 201780054749.6, and an invention title of "cover member, portable information terminal with the cover member, and display device". technical field [0002] The present invention relates to a cover member, a portable information terminal having the cover member, and a display device. Background technique [0003] In recent years, biometric authentication technology that uses fingerprints or the like for personal authentication instead of passwords has attracted attention as a high-level security measure for electronic devices. Among them, the fingerprint authentication method is adopted in mobile phones and tablets, using optical, thermal, pressure, capacitive and other sensors. From the viewpoint of sensing sensitivity and power consumption, a capacitive sensor is excellent. [0004] A capacitive sensor detects a change...
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