Optical configuration for imaging-type optical encoders

Details Optical configuration for imaging-type optical encoders Optical configuration for imaging-type optical encoders

2007-03-06

2007-03-06

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C250S23700G, C033S0010PT, C341S013000

Reexamination Certificate

active

10804636

ABSTRACT:
A displacement measuring device including a scale, and an optical readhead including an index pattern and a light receiving element is provided. A bright/dark pattern arising from a scale grating is detected by the readhead to measure displacement. In various embodiments, a magnification of the pattern is adjusted by the spacing between at least a lens element, aperture element, and detection plane of the readhead. An aperture can be designed to provide a diffraction-limited telecentric imaging configuration that filters an image of the scale grating to provide a sinusoidal intensity pattern that supports highly interpolated measurements. An aperture dimension, selected in relation to the grating pitch and other parameters, can provide a desirable combination of readhead operating characteristics including one or more of a desired depth of field; degree of spatial filtering; and optical signal power.

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English Translation of Chinese Office Action issued in corresponding Chinese Patent Application No. 2004-10045139.4, 4 pages.
Christian Berger, “Design of telecentric imaging sytstems for noncontact velocity sensors,” Oct. 2002, Optical Engineering, vol. 41 No. 10, pp. 2599-2606.

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