Endoscope and endoscope system with optical phase modulation...

Details Endoscope and endoscope system with optical phase modulation... Endoscope and endoscope system with optical phase modulation...

2006-01-10

2006-01-10

Leubecker, John P. (Department: 3739)

Surgery

Endoscope

Having imaging and illumination means

C600S160000, C359S237000

Reexamination Certificate

active

06984206

ABSTRACT:
An endoscope system consists mainly of: an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device; and a signal processing unit that processes an image signal produced by the endoscope so as to produce a video signal. The objective optical system includes an optical phase modulation member. The optical phase modulation member exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on the solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not having the optical phase modulation member.

REFERENCES:
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patent: 6241656 (2001-06-01), Suga
patent: 6842297 (2005-01-01), Dowski, Jr.
patent: 2003/0071826 (2003-04-01), Goertzen
patent: 2003/0158503 (2003-08-01), Matsumoto
patent: 2004/0004125 (2004-01-01), Havens et al.
patent: 2004/0004766 (2004-01-01), Dowski
patent: 2004/0051943 (2004-03-01), Ashkinazy et al.
patent: 2000-5127 (2000-01-01), None
patent: 2000-266979 (2000-09-01), None
Dowski, E. R., Jr., et al., “Extended depth of field through wave-front coding”, Applied Optics, vol. 34, No. 11, Apr. 10, 1995, pp. 1859-1866.

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