Fingerprint image input apparatus and method of producing the same
AssigneeNEC Corporation
InventorIchiro Fujieda
Life of this patent
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Abstract
The fingerprint image input apparatus includes two-dimensional image sensor 14 formed on transparent substrate 21 and including diffraction grating 41, photo-sensitive elements 24, switch elements 22, switching lines 25, signal reading lines 26, bias applying lines 27, and light interception plates 23 disposed below photo-sensitive elements 24, planar light source 11 and transparent protective film 42. Diffraction grating 41 is formed on two-dimensional image sensor 14 together with photo-sensitive elements 24 commonly using one or more opaque materials of photo-sensitive elements 24.
Claims9
A fingerprint image input apparatus, comprising:
- one of a planar or linear light source;
- an image sensor provided on said light source including a transparent substrate in which a plurality of photo-sensitive elements, a plurality of switch elements for individually switching outputs of said photo-sensitive elements, and a diffraction grating have been formed;
- and
- a transparent protective layer provided on said image sensor and having a surface with which a finger can contact, said transparent protective layer reflecting light, which has been emitted from said light source and diffracted by said diffraction grating, so that the light is introduced into said photo-sensitive elements.
A method of producing a fingerprint image input apparatus, comprising the steps of:
- forming one of a planar or linear light source;
- providing an image sensor on said light source, including a transparent substrate in which a plurality of photo-sensitive elements, a plurality of switch elements for individually switching outputs of said photo-sensitive elements, and a diffraction grating have been formed;
- and providing a transparent protective layer on said image sensor and having a surface with which a finger can contact.
Dependencies are inferred from the claim text.