Floating lens extending mechanism

Details Floating lens extending mechanism Floating lens extending mechanism

1983-09-27

1986-01-14

Punter, William H.

G02B 710

Patent

active

045642648

ABSTRACT:
A mechanism for extending a floating lens includes a rear group helicoid ring integral with a distance ring and supported rotatably on a stationary ring. A rear group lens frame which is threadably engaged with the rear group helicoid ring is guided for straight line movement as the rear group helicoid ring turns. A front group helicoid ring is rotatably supported on the rear group lens frame and a front group lens frame which is threadably engaged with the front group helicoid ring is guided for straight line movement as the front group helicoid ring turns. A guide plate is disposed outside the front group helicoid ring and is fixedly secured to the stationary ring. The guide plate is provided with a straight guide groove for guiding the rear group lens frame and a curved groove. A guide roller integral with the front group helicoid ring is engaged in the curved groove for turning the front group helicoid ring as the front group helicoid ring is moved back and forth with the rear group lens frame.

REFERENCES:
patent: 2537561 (1951-01-01), Waitt
patent: 3915557 (1975-10-01), Shimojima
patent: 4309076 (1982-01-01), Ito
patent: 4405205 (1983-09-01), Rossmann

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