Optical engine for fingerprint reader

Details Optical engine for fingerprint reader Optical engine for fingerprint reader

2008-05-27

2008-05-27

Carter, Aaron W. (Department: 2624)

Image analysis

Applications

Personnel identification

C356S071000, C713S186000, C340S005530, C340S005830

Reexamination Certificate

active

07379570

ABSTRACT:
An optical engine for fingerprint reader with a one-piece optical prism has double functions of prism and lens for replacing optical engines of traditional fingerprint readers that consists of a right-angle prism and a lens. Thus the volume of the device is minimized for the convenience of being modularized Moreover, there is a complete light path between the fingerprint and the sensing device so as to increase the signal to noise ratio (S/N) and the reliability as well as the stability of the optical engine. Furthermore, a LED light source is disposed around an optical prism while an arched concave with diameter of 120 mm for being pressed by finger is formed with ergonomically design so as to have more clear image of fingerprint.

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