Imaging optical system

Details Imaging optical system Imaging optical system

1991-07-22

1992-12-29

Bovernick, Rodney B.

Optical: systems and elements

Lens

Multiple component lenses

359656, 359785, G02B 2102, G02B 904

Patent

active

051756528

ABSTRACT:
An imaging optical system has a first objective lens movable along the optical axis thereof for focus adjustment and for forming the image of an object at infinity, and a second objective lens for forming the image again at a predetermined position at a predetermined magnification. The second objective lens comprises, in succession from the object side, a positive single lens, a negative single lens and a positive single lens disposed with an air space therebetween, and satisfies the following conditions:

REFERENCES:
patent: 3905686 (1975-09-01), Ruben
patent: 4449794 (1984-05-01), Yamada
patent: 4491394 (1985-01-01), Matsubara
patent: 4531815 (1985-07-01), Konno et al.
patent: 4955709 (1990-09-01), Kataoka et al.
patent: 4984877 (1991-01-01), Ito

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