Telephoto zoom lens

Details Telephoto zoom lens Telephoto zoom lens

1978-04-21

1980-09-23

Clark, Conrad J.

G02B 1518

Patent

active

042239818

ABSTRACT:
A telephoto zoom lens comprises a variable power system and a relay lens system. The variable power system comprises a first group provided with a positive refracting power and capable of focusing by displacement along the optical axis, a second group provided with a negative refracting power and capable of continuously varying focal length by displacement along the optical axis and a third group provided with a positive refracting power and capable of maintaining the focal position constant regardless of the change in the focal length by displacement along the optical axis in cooperation with said second group, said system substantially constituting an afocal system to an infinite object. The relay system includes, in the order from the object side, a front group comprising a positive lens component and a negative lens component which are separated, and a rear group comprising a negative meniscus lens component convex to the image side and a positive lens component which are separated, the rear group being separated from the front group by a large air space.

REFERENCES:
patent: 2937572 (1960-05-01), Yamaji
patent: 3615125 (1971-10-01), Higuchi
patent: 4094586 (1978-06-01), Sato

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