Powered zoom device

Details Powered zoom device Powered zoom device

1991-02-15

1992-10-27

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

359696, G03B 310

Patent

active

051593700

ABSTRACT:
A powered zoom device for a camera includes a lens having a variable magnification lens group that is adapted to be changed in a focal length in response to a displacement thereof in a direction along an optical axis. A magnification lens group is driven. The driving of the magnification lens group is controlled so as to move the magnification lens group with a constant rate of the focal length.

REFERENCES:
patent: 4445757 (1984-05-01), Enomoto et al.
patent: 4840470 (1989-06-01), Ohtake
patent: 4851869 (1989-07-01), Ishimaru et al.
patent: 4936664 (1990-06-01), Haraguchi et al.
patent: 5012273 (1991-04-01), Nakamura et al.
patent: 5028945 (1991-07-01), Kashihara et al.
United Kingdom Search Report, Application No. 9103280.5, Apr. 24, 1991.

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