Advance mechanism for close-up lens

Details Advance mechanism for close-up lens Advance mechanism for close-up lens

1979-04-04

1981-08-18

Punter, William H.

G02B 702

Patent

active

042843308

ABSTRACT:
A close-up lens cylinder having at least an attaching cylinder for attachment to a camera body, an operating ring for operating an advance for focussing an advancing cylinder for a straight advance and a lens frame for supporting a lens. An advancing groove is divided into a circumferentially extending groove and a lead or cam groove such that by rotating the operating ring, initially only the lens frame is advanced with respect to the attaching cylinder without advancing of the operating ring and the advancing cylinder. After the advance is substantially completed, the operating ring and the advancing cylinder are advanced together with the lens frame.

REFERENCES:
patent: 3850507 (1974-11-01), Uesugi

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