Focal length changeable camera

Details Focal length changeable camera Focal length changeable camera

1990-06-27

1991-04-02

Perkey, W. B.

35419512, G03B 500, G03B 1332

Patent

active

050050389

ABSTRACT:
The disclosed camera changes between two focal lengths by bringing or taking a built-in attachment lens into and out of axial alignment with a master lens. A single electric motor serves as the drive source both for changing the focal length and effecting automatic focusing. The attachment lens is brought into axial alignment with the master lens for telephoto operation and taken out of axial alignment with the master lens for standard operation.

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patent: 4597657 (1986-07-01), Wakabayashi
patent: 4643554 (1987-02-01), Ogawa

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