Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-02-20
1992-01-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023114, 25023116, H01J 314, G01D 534
Patent
active
050794183
ABSTRACT:
A position measuring apparatus for measuring the position of a first object relatively movable with respect to a second object. The position measuring apparatus includes a first deflection element, a light source positioned to scan the first deflection element with a light beam, a second deflection element, and a reflection element. The second deflection element and the reflection element are adapted with respect to each other and with respect to the first deflection element so that partial beam bundles deflected from the first deflection element are deflected by the second deflection element and emerge converging from the second deflection element into the reflection element, are reflected by the reflection element, and emerge diverging from the reflection element, impinge again on a deflection element, are deflected again and are brought into interference. The movement of the first object connected to the first deflection element with respect to the second object connected to the second deflection element can be determined by detection of the interference.
REFERENCES:
patent: 4792678 (1988-12-01), Spies
patent: 4794251 (1988-12-01), Scholian
Dreigitter schrittgeber, published 1978.
Michel Dieter
Spanner Erwin
Dr. Johannes Heidenhain GmbH
Keesee LaCharles P.
Nelms David C.
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