Real time fingerprint recording terminal
First Claim
1. Apparatus for forming an image of a fingerprint pattern for comparison with a stored pattern comprising:
- transparent right triangular prism means characterized by first and second opposed sides, first and second intersecting sides forming a common first edge, and a major side forming common second and third edges with said respective first and second intersecting sides,said major side having a concave portion therewithin adapted for contact by the ridges of a finger,light source means for forming a substantially parallel light beam having a first optical axis for incidence upon said first intersecting side whereby said light beam is refracted to illuminate said ridges at said concave portion for forming a first image of said ridges within said prism adjacent said first intersecting side, andimage forming lens means on a second optical axis for forming a second image in response to said first image.
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Accused Products
Abstract
A fingerprint optical sensor terminal is provided for use in the real time recording of an impression of a fingerprint pattern, the human finger being placed for the purpose at an input window surface of the sensor terminal. The sensor terminal provides precise angular and positional alignment of the finger and affords the immediate recognition of the presence of a finger that would produce a poor impression, permitting prompt corrective action by the operator. The sensor terminal also permits the making of an impression of a wide area of the finger, thus providing increased discrimination and accuracy of print identification with increased economy.
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Citations
8 Claims
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1. Apparatus for forming an image of a fingerprint pattern for comparison with a stored pattern comprising:
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transparent right triangular prism means characterized by first and second opposed sides, first and second intersecting sides forming a common first edge, and a major side forming common second and third edges with said respective first and second intersecting sides, said major side having a concave portion therewithin adapted for contact by the ridges of a finger, light source means for forming a substantially parallel light beam having a first optical axis for incidence upon said first intersecting side whereby said light beam is refracted to illuminate said ridges at said concave portion for forming a first image of said ridges within said prism adjacent said first intersecting side, and image forming lens means on a second optical axis for forming a second image in response to said first image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for forming an image of a fingerprint pattern comprising:
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transparent triangular prism means characterized by first and second opposed sides, first and second intersecting sides forming a common first edge, and a major side forming common second and third edges with said respective first and second intersecting sides, said major side having a concave portion therewithin adapted for contact by the ridges of a finger, said concave portion having the form of a circular section of a cylinder whose effective axis is substantially perpendicular to said first common edge, light source means for passing a light beam through said prism for incidence upon said ridges at said concave portion for forming a first image of said ridges within said prism, said concave portion being contoured at one end to determine the longitudinal position of the finger whereby said first image integrally includes substantial portions of the ridges of the tip of the finger, and means for utilizing said first image.
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Specification