Variable focal length lens, photographing lens unit, camera,...

Details Variable focal length lens, photographing lens unit, camera,... Variable focal length lens, photographing lens unit, camera,...

2008-06-18

2011-12-13

Hasan, Mohammed (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reissue Patent

active

RE043016

ABSTRACT:
A negative first group optical system, a positive second group optical system, and a positive third group optical system are sequentially arranged from the object side. A stop moving integrally with the second group optical system is provided on the object side of the second group optical system. The focal length is changed by changing distances between the group optical systems, and the third group optical system is moved on an optical axis. The first group optical system includes a negative meniscus lens, a negative meniscus lens, and a positive lens. The second group optical system includes a cemented lens of a positive lens and a negative lens, a positive lens, and a positive lens. The third group optical system includes one positive lens not including an aspherical surface.

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