Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-03-12
1992-05-05
Anderson, Bruce C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356356, H01J 314, G01B 1102
Patent
active
051110407
ABSTRACT:
The angular graduation of a graduated disk is scanned in a measuring device by a scanning unit by the movement of light beams in two angular graduation areas located diametrically opposite each other. To compensate for wobble errors caused by the wobbling of the graduated disk, the light beam emanating from a light source impinges on the graduated disk at a point outside of the angular graduation and, following reflection and deflection by a triple prism, impinges parallel to itself in the form of a light beam on an impact point in a first the graduation area. The light beam is split into two diffraction beams by the graduation, and meet, after having passed through a deflection prism, at a meeting point in a second angular graduation area. Since the impact point and the meeting point are always located on the same radius, the wobbling of the disk does not have a disadvantageous effect on the accuracy of measurement.
REFERENCES:
patent: 4577101 (1986-03-01), Bremer
patent: 4792678 (1987-10-01), Spies
patent: 4868385 (1989-09-01), Nishimura
patent: 4975571 (1990-12-01), McMurtry et al.
patent: 4988864 (1991-01-01), Michel et al.
"Laser Rotary Encoders", Nishimura et al., Motion, Jul./Aug. 1986, pp. 3-4.
"Laser Rotary Encoders," Nishimura et al., Motion Sep./Oct. 1986, pp. 14-18.
"Photoelectrical Measurement of the Change of Lengths or Angular Positions with the Help of Diffraction Lattices", Hock, Dissertation Approved by the University of Stuttgart, Submitted 10/29/75, pp. 183-184.
Bernard Harald
Spies Alfons
Anderson Bruce C.
Dr. Johannes Heidenhain GmbH
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