Image input device
First Claim
Patent Images
1. An image input device for optically sensing a pattern of an object to convert the pattern to an electrical signal for examination, consisting essentially of a single prism wherein:
- said single prism has three discrete surfaces which comprise an incidence surface to which light is incident, a reflective surface for reflecting light which is incident to said incidence surface and on which the object is to be laid, and a way-out surface through which light reflected by said reflective surface comes out;
said image input device further comprising;
a light source for irradiating said incidence surface of the prism; and
non-movable guide means fixed to said reflective surface and having a fixed configuration, for causing a lengthwise direction of the pattern of the object to extend substantially in alignment with a direction which is parallel to a ridge defined by the incidence surface and the wayout surface of the prism.
0 Assignments
0 Petitions
Accused Products
Abstract
An image input device for optically sensing a fingerprint or like pattern to convert it to an electrical signal is disclosed. A guide is provided on a contact surface, or reflective surface, of a prism to orient the lengthwise direction of the pattern of an object parallel to a ridge, which is defined by an incidence surface and a wayout surface of the prism.
-
Citations
16 Claims
-
1. An image input device for optically sensing a pattern of an object to convert the pattern to an electrical signal for examination, consisting essentially of a single prism wherein:
-
said single prism has three discrete surfaces which comprise an incidence surface to which light is incident, a reflective surface for reflecting light which is incident to said incidence surface and on which the object is to be laid, and a way-out surface through which light reflected by said reflective surface comes out; said image input device further comprising; a light source for irradiating said incidence surface of the prism; and non-movable guide means fixed to said reflective surface and having a fixed configuration, for causing a lengthwise direction of the pattern of the object to extend substantially in alignment with a direction which is parallel to a ridge defined by the incidence surface and the wayout surface of the prism. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An image input device for optically sensing a pattern of an object to convert the pattern to an electrical signal for examination, comprising:
-
(a) a prism having three discrete surfaces which comprise (1) an incidence surface to which light is incident, (2) a reflective surface for reflecting light which is incident on said reflective surface, said reflective surface having an upper contact surface on which the object is to be laid, and (3) a wayout surface through which light reflected by said reflective surface comes out; (b) a light source for irradiating said incidence surface of the prism; (c) a turntable positioned adjacent to and above said contact surface; and (d) said turntable having a notched area defining guide means for causing a lengthwise direction of the pattern of the object to extend substantially in alignment with a direction which is parallel to a ridge defined by the incidence surface and the wayout surface of the prism. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification