Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-07-08
1988-04-19
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
33125A, 356375, A45B 308, H01J 4014
Patent
active
047391642
ABSTRACT:
A position measuring arrangement for the measurement of the relative position of two objects shiftable with respect to one another wherein the measuring graduation is connected with the first object and is scanned by a scanning unit fastened to the second object. Four binary scanning signals are produced by the scanning unit with a predefined relative phase relationship. The signals are applied to a logic network for the generation of a linked binary signal. In the case of no errors, the linked binary signal is equal to a selected one of the four binary signals. In the event of an error, the linked binary signal is not equal to the selected one of the binary signals. The linked binary signal and the selected binary signal are applied to a comparator for a determination of equality and thereby a determination of the presence of errors.
REFERENCES:
patent: 3578979 (1971-05-01), Kawaguch
patent: 3709611 (1973-01-01), Taisne
patent: 3713139 (1973-01-01), Sanford et al.
patent: 3768911 (1973-10-01), Erickson
patent: 4110828 (1978-08-01), Baumgartner et al.
patent: 4395630 (1983-07-01), Ramsden et al.
patent: 4628201 (1986-12-01), Schmitt
Dr. Johannes Heidenhain GmbH
Shami Khaled
Westin Edward P.
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