Path-bending zoom optical system

Details Path-bending zoom optical system Path-bending zoom optical system

2006-07-18

2006-07-18

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S726000

Reexamination Certificate

active

07079328

ABSTRACT:
A zoom optical system includes, in order from the object side, a first lens unit with negative refracting power, a second lens unit with positive refracting power, and a lens unit with negative refracting power. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, at least, the second lens unit is moved along the optical axis, and the first lens unit includes a path-bending element for bending the optical path. The path-bending element includes at least one reflecting surface for bending the optical path, an entrance surface, and an exit surface, and at least one of the entrance surface and the exit surface is configured as a curved surface rotationally symmetrical with respect to the optical axis. Whereby, a slim design of the optical system can be achieved.

REFERENCES:
patent: 6590716 (2003-07-01), Narimatsu
patent: 6594087 (2003-07-01), Uzawa et al.
patent: HEI 9-211287 (1997-08-01), None
patent: HEI 10-020191 (1998-01-01), None

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