Camera device having posterior filter

Details Camera device having posterior filter Camera device having posterior filter

2005-01-04

2005-01-04

Perkey, W. B. (Department: 2851)

Photography

With exposure objective focusing means, focusing aid, or...

Mechanical mechanism for displacement of exposure objective

C396S544000, C348S342000, C348S345000, C359S823000

Reexamination Certificate

active

06839512

ABSTRACT:
The present invention is directed to a camera device having a posterior filter which is of compact design and facilitates attachment and detachment of optical elements such as a posterior filter. The camera device comprises a fixed lens barrel having its inner surface formed with a first helicoidal member, an active focusing barrel, for manual adjustment, rotatably disposed about an optical axis over an outer surface of the fixed lens barrel, a revolving barrel rotatably disposed about the optical axis over an inner surface of the fixed lens barrel and having its outer surface formed with a second helicoidal member, the second helicoidal member being cooperatively mated with the first helicoidal member, a coupling element communicating rotary motion of the active focusing barrel to the revolving barrel without conveying linear motion along the optical axis, a holder of a trailing lens(es) fixed to the revolving barrel in unit, a posterior filter holder receiving the linear motion along the optical axis from either the revolving barrel or the trailing lens holder but not the rotary motion from the same and detachably holding the posterior filter, and a rotary motion restriction member built in the fixed lens barrel for impeding the rotary motion of the trailing lens holder.

REFERENCES:
patent: 4862199 (1989-08-01), Centkowski et al.
patent: 6157781 (2000-12-01), Konno et al.
patent: 2001255444 (2001-09-01), None
patent: 2002350701 (2002-12-01), None

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