Fingerprint sensor using microlens

Details Fingerprint sensor using microlens Fingerprint sensor using microlens

2008-07-01

2008-07-01

Stafira, Michael P (Department: 2886)

Optics: measuring and testing

Document pattern analysis or verification

Reexamination Certificate

active

07394529

ABSTRACT:
Provided is a fingerprint sensor using a microlens including the microlens changing a path of light reflected by a fingerprint structure, and an optical-TFT checking the fingerprint structure from the light whose path is changed. Since the microlens including the spherical lens to change the path of light is provided, the amount of light incident on the light measuring area can be maximized. Also, since the noise such as dispersed light is exhausted by the spherical lens outside the light measuring area, the effect by the noise can be minimized.

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Optics Letters, Use of mass transport to reduce surface roughness in replicated gallium phosphide refractive microlenses, Apr. 15, 2000, vol. 25, No. 8, pp. 515.
Jpn. J. Appl. Phys., Microoptical Two-Dimensional Devices for the Optical Memory Head of an Ultrahigh Data Transfer Rate and Density Sytem using a Vertical Cavity Surface Emitting Laser (VCSEL) Array, vol. 41 (2002) pp. 4835-4840.
Appl. Phys. Lett., Large-numerical-aperture microlens fabrication by one-step etching and mass-transport smooting, 64 (12), Mar. 21, 1994.

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