Objective lens device

Details Objective lens device Objective lens device

1996-07-25

1997-10-28

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

359752, 359753, 359761, G02B 960, G02B 962, G02B 1304

Patent

active

056822693

ABSTRACT:
An objective lens device comprising in order from the lens closest to an object side, a negative meniscus first lens whose concave side faces the object side; a positive second lens; a positive meniscus third lens whose convex side faces an image side; a negative meniscus fourth lens whose concave side faces the object side; a negative meniscus fifth lens whose convex side faces the object side; and a positive sixth lens. The fifth and sixth lenses are cemented together to form a cemented lens subunit. The objective lens device contains six lenses in its entire lens structure, has a long back focus, and provides excellent optical properties over an entire field.

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patent: 5103343 (1992-04-01), Sekita
patent: 5132848 (1992-07-01), Nishio et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5159496 (1992-10-01), Kataoka
patent: 5253113 (1993-10-01), Sekita et al.
patent: 5341243 (1994-08-01), Okuyama et al.

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