Optical: systems and elements – Lens – With reflecting element
Reexamination Certificate
2007-11-27
2009-08-11
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
With reflecting element
C359S736000
Reexamination Certificate
active
07573654
ABSTRACT:
A dual focal length optical system includes a first optical system and a second optical system. The first optical system is positioned along an optical path and includes an optical structure having an object side surface and an image side surface. The first optical system also includes a first surface of an intermediate reflective element located between the object side surface and the image side surface of the optical structure as viewed along the optical path. The first optical system has a first focal length. The second optical system shares a portion of the same optical path and includes a second surface of the same intermediate reflective element as that of the first optical system. The second optical system has a second focal length. The first focal length of the first optical system is longer than the second focal length of the second optical system.
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U.S. Appl. No. 11/461,574, filed Aug. 1, 2006, Border et al.
Bietry Joseph R.
Border John N.
Cahall Scott C.
Griffith John D.
Choi William C
Eastman Kodak Company
Zimmerli William R.
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