Optical: systems and elements – Lens – With variable magnification
Patent
1996-05-10
1998-01-13
Nelms, David C.
Optical: systems and elements
Lens
With variable magnification
359701, G02B 1514
Patent
active
057085331
ABSTRACT:
A zoom lens barrel includes an annular stationary barrel having a guide groove. A lens drive ring is rotatably fitted onto an outer peripheral surface of the stationary barrel, and is provided with a cam groove on an inner peripheral surface thereof. A first lens moving ring, holding at least two lens groups which are spaced in the optical axis direction, is provided with a guide groove and a cam follower which extends through the guide groove of the stationary barrel to be engaged in the cam groove of the lens drive ring. The first lens moving ring is movable along the guide groove in accordance with a rotation of the lens drive ring. A second lens moving ring, having a cam groove on an inner peripheral surface thereof, is rotatably fitted onto an outer peripheral surface of the first lens moving ring so as not to move in the optical axis direction relative to the first lens moving ring. Provision is made for a lens supporting frame, provided in the first lens moving ring to move in the optical axis direction, which supports one lens group of a photographing lens system, and is provided with a cam follower which extends through the guide groove of the first lens moving ring to be slidably fitted in the cam groove of the second lens moving ring.
REFERENCES:
patent: 4324457 (1982-04-01), Tomori
patent: 4387968 (1983-06-01), Sekiguchi
patent: 4523815 (1985-06-01), Tomori
patent: 5233472 (1993-08-01), Haraguchi et al.
patent: 5264963 (1993-11-01), Ueyama
patent: 5446593 (1995-08-01), Hamasaki et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Cornely John P.
Nelms David C.
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