Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-03-04
1979-05-22
Moore, David K.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250201, H01J 3912
Patent
active
041561376
ABSTRACT:
A top illumination photoelectric measuring installation to determine the relative positions of two objects is disclosed which includes an optical reflection grid scale and a transmission grid sensor plate laterally with respect to each other and photoelectric elements to receive light reflected from the scale. In this installation, the photoelectric elements are arranged to accomplish a vignetting of the photo-sensitive surface of the photoelectric elements whenever the operating distance between the scale and the sensor plate is such that further movement of the scale and the sensor plate toward one another would produce a photo current greater than that which can be tolerated by the amplifier connected to the photo elements and provided that the admissable range of tolerance is not exceeded. Such an arrangement permits a greater range of operating distances between the sensor plate and the scale than could be achieved under a normal operating arrangement.
REFERENCES:
patent: 2227562 (1941-01-01), Underhill
patent: 2886717 (1959-05-01), Williamson et al.
patent: 3778157 (1973-12-01), Brelot et al.
Firma Dr. Johannes Heidenhain GmbH
Moore David K.
Pavlak John J.
Ropski Gary M.
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