Bent type zoom optical system and imaging system using the same

Details Bent type zoom optical system and imaging system using the same Bent type zoom optical system and imaging system using the same

2007-10-10

2009-12-08

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S676000

Reexamination Certificate

active

07630142

ABSTRACT:
The invention relates to a slimmed-down, small-format, high-zoom-ratio bent type zoom optical system that can be tucked away in a lens mount and an imaging system incorporating the same. The bent type zoom optical system or taking system comprises, in order from its object side, a first lens group G1of positive refracting power, a second lens group G2of negative refracting power and a reflecting mirror R located on an image side with respect to the second lens group G2for bending an optical axis at substantially right angles upon zooming. Between the reflecting mirror R and an imaging plane I there are a plurality of lens groups G2and G4interposed. For zooming, while the spacing between the first G1and the second lens group G2varies, at least one lens group of the plurality of lens groups G2and G4lying on the imaging plane side of the reflecting mirror R moves. The reflecting mirror R remains fixed with respect to the imaging plane I during taking operation, and upon tucked away in a lens amount, the angle of the reflecting mirror R varies such that the normal to the reflecting surface is substantially parallel with the optical axis through the first G1and the second lens group G2, and the first G1and the second lens group G2draw near to the reflecting mirror R with a narrowing spacing between them.

REFERENCES:
patent: 5-113538 (1993-05-01), None
patent: 8-327904 (1996-12-01), None
patent: 2001-75008 (2001-03-01), None

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