Optical: systems and elements – Lens – With variable magnification
Patent
1998-03-31
1999-08-10
Ben, Loha
Optical: systems and elements
Lens
With variable magnification
359700, G02B 1514
Patent
active
059367814
ABSTRACT:
A zoom lens structure having a smaller number of assembling parts, so that the structure is more compact, and is manufactured at lower cost. A cam ring has a focusing cam slot for determing a displacement amount of a focusing lens group along an optical axis at time of focusing, and a zooming cam slot for determing a displacement amount thereof in cooperation with the focusing cam slot at time of zooming. At time of focusing, the cam ring is moved along the optical axis without rotation. The cam ring also has another slot, being formed in parallel with a direction in which the cam ring moves at time of focusing, for guiding a zooming lens group. In case that the cam ring is driven at time of focusing, the driving force is not transmitted to the zooming lens group. Therefore, it is possible to drive the focusing lens group only along the optical axis at time of focusing.
REFERENCES:
patent: 4534625 (1985-08-01), Ohnuki
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5337187 (1994-08-01), Fukino et al.
patent: 5546234 (1996-08-01), Yamanouchi
patent: 5576893 (1996-11-01), Yamanouchi
patent: 5663839 (1997-09-01), Kanno
Ben Loha
Minolta Co. , Ltd.
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