HIGH POWER ZOOM LENS

Japanese Patent JP3854681

B2

PROBLEM TO BE SOLVED: To make the whole compact, enlarge an inclination of a cam groove to a plane containing the optical axis, smoothly perform zoom operation by small operation force even at either focal distance, constitute a more rational automatic focusing mechanism, and realize high power by arranging a rectilinearly advancing cylinder on the inside and outside of a fixed cylinder.
SOLUTION: A high power zoom lens is composed of a first lens group 212 which is supported by a first lens group support frame 210 and has positive refractive power, a second lens group 222 which is supported by a second lens group support frame 220 and has negative refractive power, a third lens group 232 which is supported by a third lens group support frame 230 and has positive refractive power and a fourth lens group 242 which is supported by a fourth lens group support frame 240 and has positive or negative refractive power. A zoom operation ring 10 is connected to a first variable power cam cylinder 80 by a first connecting pin 12, and integrally rotates this. A focus operation ring 20 is connected to a second lens group moving cylinder 60 through a focus connecting frame, and rotates the second lens group moving cylinder 60.

Taketoshi Okajima

JP6039697A

December 06, 2006

March 14, 1997

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Tamron Co., Ltd.

G02B7/04; G02B7/10; (IPC1-7): G02B7/04; G02B7/10

JP8304684A
JP7333482A
JP5142475A
JP9033785A
JP57116309A
JP53128330A
JP9080294A

Minoru Nakamura
Fumiaki Otsuka
Shishido Kaichi
Hideto Takeuchi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo

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