Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-08-23
2005-08-23
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S234000, C356S614000, C356S616000, C033S707000
Reexamination Certificate
active
06933492
ABSTRACT:
An optical position transducer is arranged to determine the relative position of two objects. The position transducer includes a scale and a scanning device that is movable in relation thereto. On sides of the scanning device, signal-generating device(s) are provided for generating positionally dependent scanning signals, among which at least one is a deflector element for selectively influencing a light beam's propagation direction. Positioned on sides of the scanning device are adjustment device(s) for spatially adjusting the deflector element, the adjustment device(s) arranged to enable merely one spatial alignment of the at least one deflector element.
REFERENCES:
patent: 5283434 (1994-02-01), Ishizuka et al.
patent: 5841133 (1998-11-01), Omi
patent: 6486467 (2002-11-01), Speckbacher et al.
patent: 0 548 848 (1995-11-01), None
patent: WO 02/23131 (2002-03-01), None
Linnemann Udo
Sturm Robert
Dr. Johannes Heidenhain GmbH
Pyo Kevin
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