Focal length changeable lens

Details Focal length changeable lens Focal length changeable lens

1993-01-25

1994-07-12

Look, Edward K.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359674, 359689, G02B 1504

Patent

active

053294009

ABSTRACT:
A focal length changeable lens system for use with an on-chip micro-lens equipped solid-state imaging device, whose exit pupil is located at a long distance and whose focal length is changeable between a long focal length and a short focal length. The lens system includes a first positive power lens group, a second positive power lens group and a third positive power lens group arranged in order from the object end. The lens system further includes an aperture stop fixedly disposed between the first and second lens groups where the subject focal point of the third lens group is positioned. When the second lens group is out of the optical axis, the lens system provides a long focal length, and when the first lens group is out of the optical axis, the lens system provides a short focal length.

REFERENCES:
patent: 4110005 (1978-08-01), Bohm et al.
patent: 4157211 (1979-06-01), Tanaka et al.
patent: 4715692 (1987-12-01), Yamada et al.
patent: 5097360 (1992-03-01), Fukami et al.

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