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Patent Searching and Data


Title:
OPTICAL MEMBER, UNEVENNESS DETECTION DEVICE, AND FINGERPRINT AUTHENTICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/216662
Kind Code:
A1
Abstract:
Provided is an optical member that enables the detection of a high-contrast, clear uneven image. An optical member (2A) has an incidence surface (2a), which makes contact with the surface of a finger that is a subject and through which light from the surface of the finger enters, and an emission surface (2b) from which the light entering the incidence surface (2a) is emitted, and a refractive layer (3) is formed between the emission surface (2b) and an imaging element. Of the light entering the incidence surface (2a), the light that is emitted into the optical member (2A) at an angle inclined with respect to the normal-line (L1) direction of the incidence surface (2a) propagates to the emission surface (2b), and the light is emitted to the imaging element (4A) through the refractive layer 3 provided between the emission surface (2b) and the imaging element 4A; thus, the light is refracted so as to approach the normal-line direction of the imaging element (4A).

Inventors:
HIRAIWA KENJI (JP)
Application Number:
PCT/JP2018/019546
Publication Date:
November 29, 2018
Filing Date:
May 21, 2018
Export Citation:
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Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G06T1/00; A61B5/1172; G02B5/00
Foreign References:
JP2000113170A2000-04-21
JPH1032689A1998-02-03
JP2000090248A2000-03-31
JP2003203223A2003-07-18
JP2011081666A2011-04-21
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (JP)
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