Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-10-28
1989-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231SE, H01J 314
Patent
active
048432377
ABSTRACT:
A measuring device for measuring the relative position of two objects includes a graduation of a graduation support connected with one object and a scanning device connected with the other object. The scanning device scans the graduation with light. To eliminate measuring errors that arise due to irregularities in the graduation plane of the graduation support, a first scanning graduation of a first scanning plate is positioned at a first scanning distance from the graduation plane of the graduation support and a second scanning graduation of a second scanning plate is positioned at a second scanning distance from the graduation plane of the graduation support. The scanning graduation plates are located in the scanning unit and intersect light beams from a light source. The graduation planes of the scanning graduation plates are positioned parallel to the graduation plane of the graduation support. A photoelement is optically associated with each of the scanning graduations. The photoelements produce two periodic scanning signals, from which two measuring values are formed in an evaluation device. A true measuring value is determined from these measuring values by means of a computer.
REFERENCES:
patent: 3768911 (1973-10-01), Erickson
patent: 4091281 (1978-05-01), Willhelm et al.
patent: 4614864 (1986-09-01), Wu
patent: 4650332 (1987-03-01), Muraoka et al.
patent: 4654523 (1987-03-01), Tanaka et al.
Dr. Johannes Heidenhain GmbH
Nelms David C.
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