Geometrical instruments – Area integrators – Electrical
Patent
1983-08-08
1984-07-24
Little, Willis
Geometrical instruments
Area integrators
Electrical
33125A, 356374, 250237G, G01D 5245, G01B 1102
Patent
active
044610831
ABSTRACT:
In a measuring apparatus of the type having a measuring graduation which is scanned by a scanning unit that includes a scanning plate, the scanning plate is provided with at least two phase shifted scanning fields which are phase shifted with respect to one another in order to generate two analog scanning signals which are likewise phase shifted with respect to one another. In order to allow setting of the desired phase difference between the scanning signals, at least one of the scanning fields is made up of two partial scanning fields which are offset with respect to one another and are partially coverable by means of screws or diaphragms. The corresponding analog signal is made up of two partial analog signals obtained by use of the two partial scanning fields.
REFERENCES:
patent: 3709611 (1973-01-01), Taisne
patent: 4060903 (1977-12-01), Ernst
patent: 4127772 (1978-11-01), Pryor
patent: 4170828 (1979-10-01), Ernst
patent: 4170829 (1979-10-01), Nelle
patent: 4231662 (1980-11-01), Feinland
patent: 4262423 (1981-04-01), Affa
patent: 4363964 (1982-12-01), Schmitt
patent: 4385836 (1983-05-01), Schmitt
patent: 4403859 (1983-09-01), Ernst
Handbook of Transducers for Electronic Measuring Systems, by Harry N. Norton, California Institute of Technology, 1969 by Prentice Hall, pp. 192-197.
Dr. Johannes Heidenhain GmbH
Little Willis
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