Optical: systems and elements – Lens – Telecentric system
Reexamination Certificate
2005-08-23
2005-08-23
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
Telecentric system
C359S661000, C359S726000
Reexamination Certificate
active
06934089
ABSTRACT:
An objective lens system (2), particularly for a fingerprint reader apparatus, said lens system (2) comprising a first lens (8) formed as a condensing lens guiding light beams arriving from an object generally telecentrically, an aperture stop (9) having a centre (P) and being located in the vicinity of a focal point of the first lens (8), a correcting second lens (10) arranged between the first lens (8) and the aperture stop (9) and juxtaposed with the aperture stop (9), and a correcting third lens (11) formed as a condensing lens and arranged beside the aperture stop (9) opposite the second lens (10). According to the invention, the second lens (10) is a condensing lens with a spherical surface (S3) facing the first lens (8), wherein the curvature centre of the surface (S3) is at a distance shorter than 15% of the curvature radius of the surface (S3) from the centre (P) of the aperture stop (9), and the aperture stop (9) is arranged at a distance shorter than 25% of the focal length of the first lens (8) from the focal point of the first lens (8).
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Guardware Systems Informatikai Kft.
Knobbe Martens Olson & Bear LLP
Sugarman Scott J.
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