Waveguide-type image transmission device and fingerprint identification device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Tsutsui, Yoshinao Taketomi
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Abstract
A card-shaped waveguide-type image transmission device has an image transmission base member piled up on a light illumination base member, and an optical system such as grating patterns and diffraction lens pattern for diffracting and focusing light beams are formed on the surfaces of the image transmission base member and the light illumination base member. The card-shaped waveguide-type image transmission device is integrated with an ID card, an IC card, an optical card or a ROM card as a fingerprint identification device.
Claims17
A waveguide-type image transmission device comprising:
- a light illumination means having:
- a light illumination base member made of a light transparent material and transmitting a light beam by multiple reflection on said boundary faces thereof;
- a first grating pattern formed on a part of a surface of said light illumination base member and diffracting an inputted light beam in a predetermined direction;
- a second grating pattern provided on another part of the surface of said light illumination base member and diffracting and outputting the light beam transmitted in said light illumination base member in another predetermined direction for illuminating an object to be identified;
- and
- an image transmission means having:
- an image transmission base member made of a transparent material and transmitting a light beam by multiple reflection on the boundary faces thereof;
- a third grating pattern formed on a part of a surface of said image transmission base member and diffracting an input light beam which is reflected by said object in a predetermined direction;
- a diffraction lens pattern formed on another part of the surface of said image transmission base member for focusing the light beam which is transmitted in said image transmission base member;
- and a fourth grating pattern formed on still another part of the surface of said image transmission base member and diffracting and outputting the light beam which is transmitted in said image transmission base member and focused by said diffraction lens pattern in still another predetermined direction.
A fingerprint identification device comprising:
- a card-shaped waveguide-type image transmission device having a light illumination means and an image transmission means;
- and
- a board on which a light emitting element, a light detecting element, and a control circuit for controlling said light emitting element and said light detecting element are mounted.
Dependencies are inferred from the claim text.