Biometric authentication device
AssigneeAlps Alpine Co., Ltd.
InventorKatsunari Ashimine
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Abstract
A biometric authentication device of the present invention includes a light guide layer on which a light diffusion unit for displaying an aerial image representing a design of a living body at a height is formed, a light source that irradiates the light guide layer with light, a polarized beam splitter disposed on an upper surface side of the light guide layer, a retroreflective layer disposed on a bottom surface side of the light guide layer, and an imaging camera that captures an image of a living body superimposed on the aerial image through an opening formed in the retroreflective layer, and performs biometric authentication based on an image captured by an imaging camera.
Claims9
A biometric authentication device with a function of displaying an aerial image using retroreflection, the biometric authentication device comprising:
- a light guide layer on which a design for the aerial image is formed;
- a light source that irradiates the light guide layer with light;
- a polarization beam splitter disposed on one principal surface side of the light guide layer;
- a retroreflective layer disposed on a side of the other principal surface of the light guide layer, the other principal surface facing the one principal surface;
- and
- an imaging unit that captures an image of a living body in the vicinity of a region where the aerial image is displayed via an opening formed in the retroreflective layer, wherein
- the biometric authentication device performs biometric authentication based on the image captured by the imaging unit.
Dependencies are inferred from the claim text.