Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1994-07-28
1997-12-16
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25022711, 25022728, 250557, 360128, G01N 2130
Patent
active
056988605
ABSTRACT:
A position sensor for providing an electronic output indicating the magnitude of transverse movement of an edge of a magnetic tape. A first light pipe and lens arrangement is used to deliver light to one side of a tape. A second light pipe with a small light receiving aperture is used to receive light and to deliver the received light to a detector. The focal point for the lens in the first light pipe is at the receiving aperture of the second light pipe, enabling the aperture to be very small but still receive substantially all the transmitted light. The light pipe arrangement enables use of a variety of light sources and light detectors without having to place either a source or a detector physically close to the tape or the magnetic head.
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Allen Stephone
Hewlett--Packard Company
Winfield Augustus W.
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