Stop down structure for facsimile zoom lens

Details Stop down structure for facsimile zoom lens Stop down structure for facsimile zoom lens

1981-10-27

1984-12-11

Henry, Jon W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350450, 358294, G02B 1516, G02B 1324, H04N 104

Patent

active

044874820

ABSTRACT:
A diaphragm is mounted for axial movement with the rear lens group in the zoom lens of a facsimile apparatus, and a closing ring axially movable with the rear lens group is rotatable via camming surfaces in a surrounding cylinder to close or open the aperture in accordance with the lens group axial movement.

REFERENCES:
patent: 3566965 (1971-03-01), Nagashima
patent: 3889282 (1975-06-01), Hashimoto
patent: 3906529 (1975-09-01), Filipovich
patent: 4149775 (1979-04-01), Blake
patent: 4159864 (1979-07-01), Yasukuni et al.
patent: 4273414 (1981-06-01), Shimojima

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