Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-06-09
1996-07-16
Gonzalez, Frank
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
250237G, 25023114, G01B 1102
Patent
active
055372104
ABSTRACT:
A rotation detecting apparatus includes a grating portion provided on one of two objects for which relative rotation is to be detected, a light-emitting portion provided on the other of the two objects, and a light-receiving portion provided on the other object. The grating portion has at least one multi-helix diffraction grating. The light-receiving portion receives a beam emitted from the light-emitting portion and then traveling by way of the multi-helix diffraction grating. Information of relative rotation of the two objects is detected through light reception of the light-receiving portion.
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Hisamoto Kenji
Ishii Satoshi
Ishizuka Koh
Kaneda Yasushi
Canon Kabushiki Kaisha
Eisenberg Jason D.
Gonzalez Frank
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