Camera of changeable focal length

Details Camera of changeable focal length Camera of changeable focal length

1989-08-10

1991-02-05

Brown, Brian W.

354429, G03B 118

Patent

active

049909452

ABSTRACT:
A camera has a lens system changeable as to focal length, which is driven by a driving device so as to change the focal length thereof. The driving mechanism includes a first shifting mechanism for shifting one lens of the lens system stepwise to predetermined positions in a direction parallel to the optical axis of the lens system and a second shifting mechanism for shifting another lens of the lens system stepwise with respect to the one lens in that same direction, thereby changing the focal length of the lens system.

REFERENCES:
patent: 4757372 (1988-07-01), Betensky et al.

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