Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2008-03-25
2008-03-25
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C359S383000
Reexamination Certificate
active
07348528
ABSTRACT:
A distance measuring device capable of being used in microscopes or other optical systems. Embodiments of the invention employ one or more scanning mirrors to scan a reference beam over a target to be inspected. The reference beam is returned and detected by a photodetector. The reference beam may be created by using a knife-edge element which allows the outgoing reference beam and incoming reference beam to follow the same path so that the apparent motion of the spot on the target surface is not detected by the photodetector. The photodetector generates an electronic signal corresponding to the displacement of the target away from the ideal focal point. The electrical signal may be used to drive a servomechanism to displace either the target or the microscope objective lens to bring the target in focus.
REFERENCES:
patent: 3721827 (1973-03-01), Reinheimer
patent: 4734570 (1988-03-01), Horikawa et al.
patent: 4798948 (1989-01-01), Neumann et al.
patent: 5963366 (1999-10-01), Nakamura et al.
patent: 6370422 (2002-04-01), Richards-Kortum et al.
patent: 6449087 (2002-09-01), Ogino
patent: 6717726 (2004-04-01), Boehm et al.
patent: 6879440 (2005-04-01), Cemic et al.
Principles of Optical Disc Systems, by G. Bouwhuis, et al., Published 1985, pp. 70 Through 81.
AXSYS Technologies, Inc.—Lasertrac LF100 Laser Autofocus System, Brochure Published at http://www.axsys.com/p-lasertrac.php, Last Viewed Feb. 10, 2006.
Applied Scientific Instrumentation, CRIFF Continuous Reflective-Interface Feedback Focus System, Published at http://www.asiimaging.com/criff.html, Last Viewed on Feb. 10, 2006.
Dykas, Shaver & Nipper, LLP
Ellis Suezu
Epps Georgia
Johnson Steven C.
Nipper Stephen M.
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