Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1996-04-22
1998-01-13
Williams, Hezron E.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73157, 73DIG11, 354105, 3541731, 354215, 354217, G03B 1724
Patent
active
057081921
ABSTRACT:
A device for detecting perforations in film includes a camera body or other optical instrument body. A pressure plate is disposed at a rear of the body and has a channel that allows access of a sensor output to detect and read film position via the recognition of such perforations in the moving film as it passes through the camera or optical instrument body. The pressure plate maintains the alignment of the film relative to the body. An installation board is aligned and mounted adjacent a rear of the pressure plate. A sensor is attached to the installation board. The sensor is disposed to face a section of the film having perforations through the channel of the pressure plate as the film moves along a film path. The sensor transmits electronic signals corresponding to the position of perforations of the film as the film moves along the film path. The invention provides for the efficient and economical construction of a device having a sensor for detecting perforations in film.
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patent: 3723650 (1973-03-01), Bradley et al.
patent: 5147169 (1992-09-01), Miller et al.
patent: 5155511 (1992-10-01), Tamamura
patent: 5287136 (1994-02-01), Kitagawa et al.
patent: 5307100 (1994-04-01), Kubo
patent: 5517266 (1996-05-01), Funaki et al.
Nishizawa Akio
Wakabayashi Hiroshi
Nikon Corporation
Wiggins J. David
Williams Hezron E.
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