Optical: systems and elements – Lens – Telecentric system
Reexamination Certificate
2011-03-29
2011-03-29
Harrington, Alicia M (Department: 2873)
Optical: systems and elements
Lens
Telecentric system
C359S796000
Reexamination Certificate
active
07916398
ABSTRACT:
This high performance front objective lens system intended primarily for use with a video inspection apparatus has a first lens set in the form of a doublet, with a second lens set intermediate the first lens set and the imaging plane. The second lens set includes a doublet and an adjacent lens. The overall system has an effective focal length of 50 mm, a front focal length of 38.75 mm, and a numerical aperture greater than 0.2. Further, the material of the doublets is chosen to have a small, gradual transition in index between the elements of the lens and the cement, minimizing back reflections and thereby eliminating the need for index matching coatings on the cemented surfaces of the doublets. Finally, the imaging plane of the system matches that of standard ring lights used with video inspection apparatus.
REFERENCES:
patent: 5690417 (1997-11-01), Polidor et al.
patent: 6179439 (2001-01-01), Choate
patent: 6292306 (2001-09-01), Betensky
patent: 6488398 (2002-12-01), Bloch et al.
patent: 6518996 (2003-02-01), Polidor et al.
patent: 2009/0067043 (2009-03-01), Lau et al.
Harrington Alicia M
Harter Secrest & Emery LLP
Quality Vision International, Inc.
Ryan, Patent Agent Thomas B.
Salai Esq. Stephen B.
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