WO2016031870A1 - Plaque de couverture pour capteur d'authentification d'empreintes digitales, unité d'authentification d'empreintes digitales et appareil électronique - Google Patents

Plaque de couverture pour capteur d'authentification d'empreintes digitales, unité d'authentification d'empreintes digitales et appareil électronique Download PDF

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Publication number
WO2016031870A1
WO2016031870A1 PCT/JP2015/074053 JP2015074053W WO2016031870A1 WO 2016031870 A1 WO2016031870 A1 WO 2016031870A1 JP 2015074053 W JP2015074053 W JP 2015074053W WO 2016031870 A1 WO2016031870 A1 WO 2016031870A1
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Prior art keywords
fingerprint authentication
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cover plate
sensor cover
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PCT/JP2015/074053
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English (en)
Japanese (ja)
Inventor
一平 三輪
甫 戸田
実 中須賀
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京セラ株式会社
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Application filed by 京セラ株式会社 filed Critical 京セラ株式会社
Priority to CN201580045485.9A priority Critical patent/CN106604905A/zh
Priority to JP2015557256A priority patent/JP5898392B1/ja
Publication of WO2016031870A1 publication Critical patent/WO2016031870A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing

Definitions

  • the present invention relates to a sensor cover plate for fingerprint authentication, a fingerprint authentication unit including the same, and an electronic device including the fingerprint authentication unit.
  • fingerprint authentication has become widespread as a method for identifying individuals by using individual physical characteristics as a key in order to enhance security such as management of various devices and entrance / exit management of various gates.
  • Such fingerprint authentication uses a capacitive sensor with low power consumption, particularly in a device that is miniaturized.
  • This capacitance type sensor is for recognizing a fingerprint shape by measuring the capacitance between the unevenness of a finger as a detection object and an electrode formed on a detection body.
  • a cover plate is provided with a material such as an acrylic resin such as polymethacrylic acid (PPMA) resin, polycarbonate (PC) resin, or glass in order to protect the electrodes and the like.
  • PPMA polymethacrylic acid
  • PC polycarbonate
  • these materials cannot be reduced in thickness from the viewpoint of mechanical properties, and the relative dielectric constant of the material itself is low, so that there is a problem that the change in capacitance is small and the sensor sensitivity is low.
  • Patent Document 1 proposes a transparent ceramic made of zirconium oxide or aluminum oxide as the cover plate.
  • a protective film may be formed on the front or back surface of the transparent ceramic so that the inside is not visually recognized, but the manufacturing cost increases.
  • the sensitivity of the fingerprint authentication sensor is lowered by having the protective film.
  • the sensor cover plate for fingerprint authentication is required to improve the sensitivity of the sensor for fingerprint authentication and reduce the appearance.
  • the present invention has been devised to satisfy the above requirements, and can improve the sensitivity of the fingerprint authentication sensor and can reduce the appearance of the device on which the fingerprint authentication sensor is mounted.
  • An object is to provide a plate, a fingerprint authentication unit including the plate, and an electronic device including the fingerprint authentication unit.
  • the sensor cover plate for fingerprint authentication of the present invention is made of ceramics, and has a lightness index L * in the CIE 1976 L * a * b * color space of 7 mm or less (excluding zero) by diffuse reflected light treatment.
  • the chromaticness index a * is ⁇ 2 or more and 2 or less
  • the chromaticness index b * is ⁇ 1 or more and 1 or less.
  • the fingerprint authentication unit of the present invention includes the fingerprint authentication sensor cover plate and the fingerprint authentication sensor configured as described above.
  • the electronic device of the present invention includes the fingerprint authentication unit having the above-described configuration.
  • the sensor cover plate for fingerprint authentication of the present invention is made of ceramics, the dielectric constant is high and the mechanical properties are high, so that the thickness can be reduced, so that the sensitivity of the fingerprint authentication sensor can be increased, and Since the inside is not visually recognized from the outside, the appearance is hardly impaired.
  • the fingerprint authentication unit of the present invention has a high security function.
  • the electronic device of the present invention has a high security function and an excellent aesthetic appearance.
  • the sensor cover plate for fingerprint authentication of the present embodiment is made of ceramics, and has a lightness index L * in the CIE 1976 L * a * b * color space by diffuse reflection processing at a thickness of 0.05 mm or less (excluding zero). 7 or less, the chromaticness index a * is ⁇ 2 or more and 2 or less, and the chromaticness index b * is ⁇ 1 or more and 1 or less.
  • the sensor cover plate for fingerprint authentication according to the present embodiment satisfying such a configuration is made of ceramics, so that the dielectric constant is high and the mechanical properties are high, so that the thickness can be reduced. Can be improved.
  • the thickness is 0.05 mm or less (excluding zero)
  • the lightness index L * in the CIE 1976 L * a * b * color space by diffuse reflection processing is 7 or less
  • the chromaticness index a * is ⁇ 2 or more.
  • the chromaticness index b * is ⁇ 1 or more and 1 or less, the inside of the electrode or the like is not visually recognized from the outside, and the appearance of the device on which the fingerprint authentication sensor is mounted is less likely to be damaged.
  • examples of the ceramic that serves as the sensor cover plate for fingerprint authentication according to the present embodiment include a silicon nitride sintered body, an alumina sintered body, a zirconia sintered body, and the like that include the above-described coloring component having the color tone. It is done.
  • the zirconia sintered body means that zirconia (ZrO 2 ) occupies 70% by mass or more out of 100% by mass of all components constituting the zirconia sintered body. The same applies to the silicon nitride sintered body and the alumina sintered body.
  • the content of zirconia was identified by XRD by measuring the content of Zr using an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer (ICP) or a fluorescent X-ray analyzer (XRF).
  • ICP Inductively Coupled Plasma
  • XRF fluorescent X-ray analyzer
  • the content can be calculated by converting to ZrO 2 which is a compound.
  • the peak of alumina (Al 2 O 3 ) is the highest
  • the Al content may be measured and converted to Al 2 O 3 .
  • the peak of silicon nitride (Si 3 N 4 ) is the highest, the Si content is measured and converted to Si 3 N 4 , or the presence of other nitrides is not confirmed, measuring the content of nitrogen may be converted into Si 3 N 4.
  • the lightness index L *, chromaticness index a *, and b * in the CIE 1976 L * a * b * color space by diffuse reflection processing are, for example, a color difference meter (former Minolta CR-221 or its successor model). It can be measured in accordance with JIS Z 8722-2009 irradiation and light reception geometric condition a under the condition that the light source is CIE standard light source D65 and the measurement diameter is 3 mm.
  • a measuring object when the surface processed into the mirror surface whose arithmetic mean roughness Ra is 0.03 micrometer or less is made into a measuring surface, and the thickness of a measuring object exceeds 0.05 mm, it will be 0.05 mm. It can be used as a measurement sample by grinding to a mirror and mirror finishing.
  • the thickness of the measurement object is less than 0.05 mm
  • the surface as it is if it is mirror-finished is used as the measurement surface, and if it is not mirror-finished, the surface that is mirror-finished is used as the measurement surface. do it.
  • the thickness is less than 0.05 mm
  • the lightness index L * in the CIE 1976 L * a * b * color space by diffuse reflection processing is 7 or less
  • the chromaticness index a * is ⁇ 2 or more and 2 or less
  • the chromaticness index b * is If it is ⁇ 1 or more and 1 or less, even if the thickness is 0.05 mm, the lightness index L * in the color space CIE1976L * a * b * color space is 7 or less
  • the chromaticness index a * is ⁇ 2 or more and 2 or less
  • the chromaticness index b * satisfies the requirement of ⁇ 1 or more and 1 or less.
  • the lightness index L * is an index indicating the lightness and darkness of the color tone. If the value of the lightness index L * is large, it is a bright color tone, and if the value of the lightness index L * is small, it is a dark color tone. is there.
  • the chromaticness index a * is an index indicating the degree of color tone from red to green. If the chromaticness index a * is a large value on the plus side, the chromaticness index a * is a red color tone, and the chromaticness index a If * is a large value on the minus side, it means a greenish tone.
  • the chromaticness index b * is an index indicating the degree of yellow to blue of the color tone. If the chromaticness index b * is a large value on the plus side, it is a yellowish tone, and the chromaticness index b If * is a large value on the minus side, it means a blue color tone.
  • the sensor cover plate for fingerprint authentication of the present embodiment has a lightness index L * in a CIE 1976 L * a * b * color space by diffuse reflection processing of 7 or less, a chromaticness index a * of ⁇ 2 or more and 2 or less, Since the chromaticness index b * is not less than ⁇ 1 and not more than 1, it has a color tone close to black.
  • the sensor cover plate for fingerprint authentication of the present embodiment has a lightness index L * in the CIE 1976 L * a * b * color space of 7 or less and a chromaticness index a * even when the thickness is 0.1 mm. Is ⁇ 2 or more and 2 or less, and the chromaticness index b * is ⁇ 1 or more and 1 or less.
  • the ceramic used as the sensor cover plate for fingerprint authentication of the present embodiment is made of a zirconia sintered body.
  • the zirconia sintered body has a mechanical characteristic equivalent to that of the silicon nitride sintered body, specifically, the three-point bending strength by a test piece in accordance with JIS R 1601-2008 is about 1000 MPa, and is nitrided. This is because it has a relative dielectric constant three times that of a silicon-based sintered body or an alumina-based sintered body.
  • the sensor cover plate for fingerprint authentication of the present embodiment is made of a zirconia sintered body, it can have a thickness that was not possible with PPMA, PC, glass, etc. due to excellent mechanical properties, and has a high relative dielectric constant. Therefore, the sensitivity of the fingerprint authentication sensor can be improved.
  • the sensor cover plate for fingerprint authentication of the present embodiment has a thickness index of 0.05 mm, the lightness index L * in the CIE 1976 L * a * b * color space by the total transmittance process is 10 or less, and the chromaticness index a *. Is preferably ⁇ 2 or more and 2 or less, and the chromaticness index b * is preferably 4 or more and 8 or less.
  • the sensor cover plate for fingerprint authentication satisfying such a configuration hardly transmits light, so that the inside of the electrode or the like is not visually recognized from the outside, and the device for mounting the fingerprint authentication sensor is not provided. The risk of damaging the appearance is further reduced.
  • the lightness index L * in the CIE 1976 L * a * b * color space by the total transmittance treatment is 10 or less
  • the chromaticness index a * is ⁇ 2 or more and 2 or less
  • the chromaticness index b The sensor cover plate for fingerprint authentication whose * is 4 or more and 8 or less has a lightness index L * in the CIE 1976 L * a * b * color space of 3 or less and a chromaticness index when the thickness is 0.1 mm.
  • a * is from ⁇ 1 to 1
  • the chromaticness index b * is from ⁇ 1 to 1.
  • the lightness index L * in the CIE 1976 L * a * b * color space by total transmitted light processing is 8 or less
  • the chromaticness index a * is ⁇ 1 or more and 1 or less
  • the lightness index L *, chromaticness index a *, and b * in the CIE 1976 L * a * b * color space obtained by total transmitted light processing are, for example, a spectrocolorimeter (CM-3700A manufactured by Minolta), and JIS Z
  • CM-3700A manufactured by Minolta
  • JIS Z JIS Z
  • the measurement can be performed under the conditions of the light source CIE standard light source D65, the viewing angle 10 °, the irradiation diameter ⁇ 28 mm, and the measurement diameter ⁇ 25.4 mm in accordance with the irradiation and light reception geometric condition g of 8722-2009.
  • a mask may be used as necessary.
  • an alumina film is provided on the ceramic surface.
  • an alumina film is provided on the surface of the ceramic, it has high scratch resistance.
  • the thickness of the alumina film is 0.1 ⁇ m or more and 2 ⁇ m or less, it has high scratch resistance while maintaining high sensor sensitivity.
  • the fingerprint authentication unit of this embodiment includes the fingerprint authentication sensor cover plate and the fingerprint authentication sensor of this embodiment.
  • the sensor cover plate for fingerprint authentication of the present embodiment has a high relative dielectric constant and high mechanical characteristics, so that it can be thinned and the sensitivity of the fingerprint authentication sensor can be increased.
  • the fingerprint authentication unit provided with has a high security function.
  • the electronic device of the present embodiment since the electronic device of the present embodiment includes the fingerprint authentication unit of the present embodiment, it has a high security function and an excellent aesthetic appearance.
  • a built-in type mounted on an information terminal such as a mobile phone or a personal computer, a door of a building or a passenger car, an automatic teller machine (ATM), or a USB is used.
  • ATM automatic teller machine
  • USB USB
  • silicon nitride-based sintered bodies silicon nitride powder, sintering aid powder (for example, calcium oxide, aluminum oxide, rare earth element oxide) and colored component powder (for example, iron oxide powder, tungsten oxide) Powder) is weighed in a predetermined amount and put into a barrel mill, rotary mill, vibration mill, bead mill or attritor together with a solvent, and wet-mixed and pulverized to form a slurry.
  • sintering aid powder for example, calcium oxide, aluminum oxide, rare earth element oxide
  • colored component powder for example, iron oxide powder, tungsten oxide
  • the sintering aid powder is calcium oxide powder, aluminum oxide powder, and rare earth element oxide powder
  • the sintering aid powder is a total of 100 of silicon nitride powder and sintering aid powder. Weigh out 3% by mass or more and 18.2% by mass or less. Further, in each sintering aid powder, among the total 100 mass% of the calcium oxide powder, the aluminum oxide powder and the rare earth element oxide powder, the calcium oxide powder is 0.3 mass% or more and 1.5 mass% or less, The aluminum oxide powder may be 14.2 mass% or more and 48.8 mass% or less, and the remainder may be rare earth element oxide powder.
  • the coloring component powder is an iron oxide powder and a tungsten oxide powder
  • these powders are 0.6 mass of iron oxide powder with respect to 100 mass% in total of silicon nitride powder and sintering aid powder. % To 8.5% by mass, and the tungsten oxide powder is weighed to be 0.13% by mass to 3.7% by mass.
  • the resulting molded body is degreased at a temperature of 500 ° C. or higher and 800 ° C. or lower in a nitrogen atmosphere or a vacuum atmosphere to obtain a degreased body.
  • the degreased body is placed in a firing furnace in which a graphite resistance heating element is installed, and sintered at a temperature of 1700 ° C. or higher and lower than 1800 ° C. to obtain a sintered body.
  • aluminum oxide powder e.g, manganese carbonate powder, iron oxide powder, chromium oxide powder
  • sintering aid powder eg, calcium carbonate powder, hydroxide
  • the sintering aid powder is weighed so that it is 0.6% by mass or more and 2% by mass or less, out of 100% by mass of all components constituting the sintered body. Further, the colored component powder is weighed so as to be 8% by mass or more and 14.4% by mass or less of 100% by mass of all components constituting the sintered body.
  • a desired amount of a binder, a solvent, and a dispersant are weighed and prepared, put into a stirrer together with the primary raw material powder, and mixed and stirred to obtain a slurry. Thereafter, the slurry is spray-dried using a spray dryer to obtain granules. And using the obtained granule, it is set as the molded object of desired shape by the powder press method.
  • a sintered body is obtained by firing at a temperature of 1450 ° C. or higher and 1600 ° C. or lower using a firing furnace in an air (oxidation) atmosphere.
  • zirconia powder stabilized with yttria is prepared.
  • an aluminum oxide powder is prepared as a sintering aid powder, and iron oxide powder, chromium oxide powder, and cobalt oxide powder are prepared as colored component powders.
  • the aluminum oxide powder is 0.1% by mass to 1.5% by mass
  • the iron oxide powder is 0.2% by mass or more. 1.5% by mass or less
  • chromium oxide powder is 0.5% by mass to 3% by mass
  • cobalt oxide powder is 0.5% by mass to 3% by mass
  • the balance is zirconia powder.
  • a primary raw material powder is used.
  • a desired amount of a binder, a solvent, and a dispersant are weighed and prepared, put into a stirrer together with the primary raw material powder, and mixed and stirred to obtain a slurry. Thereafter, the slurry is spray-dried using a spray dryer to obtain granules. And using the obtained granule, it is set as the molded object of desired shape by the powder press method.
  • a sintered body is obtained by firing at a temperature of 1300 ° C. or higher and 1550 ° C. or lower using a firing furnace in an air atmosphere.
  • the sensor cover plate for fingerprint authentication of this embodiment can be obtained by grinding the surface of the obtained sintered body made of each material and processing it to a desired thickness. Moreover, you may perform a mirror surface process after a grinding process.
  • the lightness index L * in the CIE 1976 L * a * b * color space by total transmitted light processing is 10 or less
  • the chromaticness index a * is ⁇ 2 or more and 2 or less
  • the chromaticness index b In order to obtain the sensor cover plate for fingerprint authentication of this embodiment in which * is 4 or more and 8 or less, the equivalent circle diameter is 0.8 ⁇ m or more at the surface area of 9.074 ⁇ 10 5 ⁇ m 2 on the surface of the zirconia sintered body.
  • the porosity is 0.7 area% or more and 1.2 area% or less, and the number of pores may be 1400 or more and 2400 or less.
  • a pore forming agent having an average diameter of 1.8 ⁇ m or more and 2 ⁇ m or less and 0.1% by mass or more and less than 1.0% by mass, and a dispersant for dispersing the pore forming agent May be added to the slurry.
  • the pore-forming agent and the dispersant are burned away by firing, and pores having an average diameter of 1.8 ⁇ m or more and 2 ⁇ m or less are formed by the burning of the pore-forming agent.
  • the sensor cover plate for fingerprint authentication made of a zirconia sintered body having 1400 or more and 2400 or less pores is incident due to the presence of pores and the difference in refractive index between the zirconia crystal and other crystals. Since the incident light is easily reflected and the incident light hardly transmits, the inside of the electrode or the like is less likely to be visually recognized from the outside, and the possibility of impairing the appearance of the device on which the fingerprint authentication sensor is mounted is reduced.
  • the equivalent circle diameter is 0.8 ⁇ m or more at the surface area of 9.074 ⁇ 10 5 ⁇ m 2 on the surface of the zirconia sintered body.
  • the porosity is 0.7 area% or more and 0.9 area% or less, and the number of pores may be 1400 or more and 1700 or less.
  • the porosity is 0.7 area% or more and 0.9 area.
  • the sensor cover plate for fingerprint authentication made of a zirconia sintered body having 1400 or more and less than 1700 pores is incident due to the presence of pores and the refractive index difference between the zirconia crystal and other crystals. Therefore, the inside of the electrode or the like is not visually recognized from the outside, and the appearance of the device on which the fingerprint authentication sensor is mounted is not impaired.
  • the lightness index L * in the CIE 1976 L * a * b * color space by total transmitted light processing is 8 or less
  • the chromaticness index a * is ⁇ 1 or more and 1 or less
  • the chromaticness index b The sensor cover plate for fingerprint authentication according to the present embodiment in which * is 5 or more and 7 or less has a thickness of 0.05 mm even in a structure having a light source on the lower side as well as the incident light on the upper side. However, the light can be blocked so that the light source cannot be confirmed.
  • the surface of the ceramic can be blackened by carbon vapor deposition, but as described above, the ceramic blackened by carbon vapor deposition is CIE 1976 L * a * b * by the total transmittance treatment when the thickness is 0.1 mm.
  • the lightness index L * in the color space is 15 or more.
  • the sensor cover for fingerprint authentication of the present embodiment in which the lightness index L * in the CIE 1976 L * a * b * color space by the total transmitted light processing is 10 or less at a half thickness of 0.05 mm It can be seen whether the plate has a low light transmittance.

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Abstract

[Problème] La présente invention concerne : une plaque de couverture pour capteur d'authentification d'empreintes digitales qui permet une meilleure sensibilité du capteur d'authentification d'empreintes digitales et qui n'est pas susceptible de dégrader l'aspect extérieur de l'appareil équipé du capteur d'authentification d'empreintes digitales; une unité d'authentification d'empreintes digitales dotée de celle-ci; et un appareil électronique muni de l'unité d'authentification d'empreintes digitales. [Solution] Cette plaque de couverture pour capteur d'authentification d'empreintes digitales est formée à partir de céramique et présente, à une épaisseur inférieure ou égale à 0,05 mm, un indice de clarté L* inférieur ou égal à 7, un indice de chromie a* compris entre -2 et 2 inclus et un indice de chromie b* compris entre -1 et 1 inclus dans l'espace colorimétrique CIE 1976 L*a*b* en raison d'un traitement de la réflexion diffuse.
PCT/JP2015/074053 2014-08-27 2015-08-26 Plaque de couverture pour capteur d'authentification d'empreintes digitales, unité d'authentification d'empreintes digitales et appareil électronique WO2016031870A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580045485.9A CN106604905A (zh) 2014-08-27 2015-08-26 指纹认证用传感器罩板、指纹认证单元以及电子设备
JP2015557256A JP5898392B1 (ja) 2014-08-27 2015-08-26 静電容量方式指紋認証用センサカバープレートおよび指紋認証ユニットならびに電子機器

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JP2014-172796 2014-08-27
JP2014172796 2014-08-27

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WO2016031870A1 true WO2016031870A1 (fr) 2016-03-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106385473A (zh) * 2016-10-29 2017-02-08 广东欧珀移动通信有限公司 壳体、指纹模组和移动终端
CN106385473B (zh) * 2016-10-29 2022-09-09 Oppo广东移动通信有限公司 壳体、指纹模组和移动终端

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