Floating disc photoconductive film reader

Details Floating disc photoconductive film reader Floating disc photoconductive film reader

1981-12-28

1984-05-22

McElheny, Jr., Donald E.

Facsimile and static presentation processing

Facsimile

Recording apparatus

346155, H04N 586

Patent

active

044504896

ABSTRACT:
A photoconductive film reader comprises a disc with a read head attached to its bottom surface at an edge point and rotated over the photoconductive film at a sufficiently high velocity so that the read head floats aerodynamically on the film, the read head having means for sensing the information stored as electrostatic charge on the film. The film has a reset strip of a predetermined amount of charge prerecorded along one of its edges, resetting of the read head electronics being coincident with the passage of the read head over the reset strip. The floatation of the read head on the film reduces the effect of film modulations on the film-to-read head spacing and allows the spacing to be well defined and controllable.

REFERENCES:
patent: 2743318 (1956-04-01), De Forest
patent: 2876295 (1959-03-01), Irby
patent: 2900444 (1959-08-01), Camras
patent: 2932548 (1960-04-01), Nau et al.
patent: 3320371 (1967-05-01), Bach
patent: 3903594 (1975-09-01), Koneval
patent: 4125854 (1978-11-01), Kirtikar
patent: 4137536 (1979-01-01), Hinz et al.
patent: 4254424 (1981-03-01), Landheer et al.

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