Objective lens for variable field angle endoscope

Details Objective lens for variable field angle endoscope Objective lens for variable field angle endoscope

1995-07-24

1998-05-05

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359656, G02B 1514, G02B 2102

Patent

active

057483850

ABSTRACT:
An objective lens for use in a variable field angle endoscope which enables its field angle without increasing the diameter of the front end of the endoscope or complicating the shape of the same by moving a rear set of lenses between two positions where a conjugate distance of the rear set of lenses for image formation becomes substantially the same. Release lenses of a third group lens group are movable between two positions in the direction of the optical axis. When the relay lenses are situated at a first position, i.e., a wide angle position, the field angle of the objective lens becomes large. However, when the relay lenses are situated at a second position, i.e., a telephoto position, the field angle of the same becomes small. When the relay lenses are switched from one position to the other position, a focused image of a subject is formed at a second image formation position without changing a distance between first and second image formation positions, i.e., without changing a conjugate distance or the positions of other lenses.

REFERENCES:
patent: 2050024 (1936-07-01), Sonnefeld
patent: 3481665 (1969-12-01), Rosenberger
patent: 3609005 (1971-09-01), Nakamura
patent: 4149774 (1979-04-01), Hirano et al.
patent: 4729643 (1988-03-01), Kawaguchi et al.
patent: 5061053 (1991-10-01), Hirakawa
patent: 5103341 (1992-04-01), Ulrich et al.
patent: 5191473 (1993-03-01), Kashima et al.
patent: 5257134 (1993-10-01), Sugawara
patent: 5274503 (1993-12-01), DeJager
patent: 5481405 (1996-01-01), Simbal

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