Optical: systems and elements – Lens – With variable magnification
Patent
1997-08-06
2000-06-13
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359698, G02B 1514
Patent
active
060756551
ABSTRACT:
A lens barrel has a focusing operation and a zooming operation which are carried out with only one driving source which is installed outside the lens barrel so as to realize a most suitable resolution for each of the operations. A rotary cylinder which supports a zooming frame which is axially movably therein, is connected to a linear-moving cylinder with a bayonet, which is axially movably supported inside a fixed cylinder. A focus rotation transmission key of a driving cylinder drives a lens frame which engages the zooming frame by a connecting helicoid. A zooming rotation transmission key of the driving cylinder engages an edge surface, forming a rotation transmission groove, of the rotary cylinder, with a play range. Upon rotation of the driving cylinder, only the lens frame is rotated to operate a focusing operation within the play range; however, the rotary cylinder is rotated to operate a zooming operation when the key contacts the edge surface of the rotary cylinder.
REFERENCES:
patent: 5592250 (1997-01-01), Shimizu
Funahashi Akira
Tanii Junichi
Epps Georgia
Lucas Michael A
Minolta Co. , Ltd.
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