Endoscope objective optical system

Details Endoscope objective optical system Endoscope objective optical system

2005-01-18

2005-01-18

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S660000, C359S682000

Reexamination Certificate

active

06844985

ABSTRACT:
An endoscope objective optical system includes a negative first lens group, a positive second lens group, a positive third lens group, and a negative fourth lens group, in this order from the object. The positive second lens group and the positive third lens group are arranged to move while the object distance is varied without changing the overall length from the first lens group to an imaging plane. Due to this arrangement, the focal length of the endoscope objective optical system is varied while maintaining an in-focus state.

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patent: 2876252 (1999-01-01), None
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patent: 200191832 (2001-04-01), None
patent: 2001166203 (2001-06-01), None
English Lannguage Translation of JP Appln. No. 2876252.
English Language Translation of JP Appln. No. 11-295596.
English Language Translation of JP Appln. No. 2000-330024.
English Language Translation of JP Appln. No. 2001-166203.

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