Variable magnification optical system

Details Variable magnification optical system Variable magnification optical system

2005-10-05

2008-03-04

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

07339747

ABSTRACT:
A variable magnification optical system for forming an optical image of an object on the light receiving surface of the image sensor so that the magnification is variable includes from the object side: a first lens unit GR1having negative optical power; a second lens unit GR2having positive optical power; a third lens unit GR3having positive optical power; and a fourth lens unit GR4having positive or negative optical power. In magnification variation from the wide-angle end (W) to the telephoto end (T), at least first lens unit GR1and the second lens unit GR2are movable, and the fourth lens unit GR4is stationary. An optical member having a wavelength selecting property is included in the fourth lens unit GR4.

REFERENCES:
patent: 6785056 (2004-08-01), Mihara
patent: 6989943 (2006-01-01), Itoh
patent: 2003/0197947 (2003-10-01), Obama et al.

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