Telephoto lens system

Details Telephoto lens system Telephoto lens system

1983-10-06

1986-09-09

Corbin, John K.

350475, G02B 960

Patent

active

046105140

ABSTRACT:
A telephoto lens system comprises, from the object side to the image side, a first positive lens unit, a second negative lens unit, and a third positive lens unit, the second lens unit alone being shiftable along the optical axis with the first and third lens units being stationary for focusing the whole lens system. The first lens unit consists of a first positive component, a second positive meniscus component convex to the object side, and a third negative component of a doublet composed of cementing together a positive meniscus lens convex to the object side and a negative meniscus lens convex to the object side, the cemented surface of the third component being convex to the object side. Another feature is characterized that the light pencils exited from the second lens unit are properly convergent.

REFERENCES:
patent: Re30708 (1981-08-01), Momiyama
patent: 4045128 (1977-08-01), Momiyama
patent: 4113357 (1978-09-01), Nakamura
patent: 4240703 (1980-12-01), Momiyama
patent: 4348084 (1982-09-01), Kitagishi et al.
patent: 4359272 (1982-11-01), Kreitzer

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