Light path reflecting optical system and apparatus provided...

Details Light path reflecting optical system and apparatus provided... Light path reflecting optical system and apparatus provided...

2006-10-17

2006-10-17

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With reflecting element

C359S779000, C359S774000

Reexamination Certificate

active

07123425

ABSTRACT:
An optical system comprises, at least, in order from an object side, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, and a fourth lens group having positive refracting power, wherein at least, the second lens group and the fourth lens group move along an optical axis when magnification is changed from a wide angle end to a telephoto end, and the first lens group contains a light path reflecting element having refracting power.

REFERENCES:
patent: 6956612 (2005-10-01), Bean et al.
patent: 2004/0051960 (2004-03-01), Mihara
patent: 09-211287 (1997-08-01), None
patent: 10-020191 (1998-01-01), None

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