Objective optical system for endoscopes

Details Objective optical system for endoscopes Objective optical system for endoscopes

1994-01-21

1996-08-20

Apley, Richard J.

Surgery

Endoscope

Having imaging and illumination means

600176, 600173, 600160, 359239, A61B 106

Patent

active

055474578

ABSTRACT:
An objective optical system for endoscopes comprising a plurality of lens components and an aperture stop, and configured so as to permit adjusting a distance to an object to be observed simply by exchanging a lens component disposed in the vicinity of the aperture stop with another lens component having a focal length different from that of the lens component disposed in the vicinity of the aperture stop. This objective optical system for endoscopes can have an optimum depth of field by changing a diameter of the aperture stop along with the exchange of the lens component disposed in the vicinity of the aperture stop.

REFERENCES:
patent: 4273109 (1981-06-01), Enderby
patent: 4558691 (1985-12-01), Okada
patent: 4660982 (1987-04-01), Okada
patent: 4706653 (1987-11-01), Yamamoto
patent: 4747661 (1988-05-01), Ohkilwa
patent: 4765313 (1988-08-01), Kumakura
patent: 4787370 (1988-11-01), Kanamori
patent: 4856495 (1989-08-01), Tohjoh et al.
patent: 4941457 (1990-07-01), Hasegawa

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