Variable magnification optical system

Details Variable magnification optical system Variable magnification optical system

2008-03-04

2008-03-04

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

11235623

ABSTRACT:
A variable magnification optical system for forming an optical image of an object on a light-receiving surface of an image sensor with variable magnification includes: from the object side, at least a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. In magnification variation from the wide angle end to the telephoto end, at least the first lens unit moves. Conditional formulae (1) and (2) below are fulfilled: (1) 6.0<fl/fw<20.0 and (2) 1.83<Ndave, where fl represents the focal length of the first lens unit, fw represents the focal length of the entire system at the wide angle end, and Ndaverepresents the average refractive index for a d-line among all lens elements included in the second lens unit.

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patent: 2004-212512 (2004-07-01), None

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