Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2007-07-05
2009-11-17
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C356S521000, C250S23700G, C250S559290
Reexamination Certificate
active
07619745
ABSTRACT:
An optical encoder which is designed to convert light generated from a light source into parallel light rays by using a collimator lens, thereby allowing the collimated light to radiate to gratings (a first grating, a second grating and a third grating). A diffusing element (a diffusion plate or a diffusion surface) is provided between the light source and the collimator lens to mitigate the parallelization degree of light, thereby weakening the second-order and the third-order or high-order diffraction light. Consequently, even where a light emitting diode (LED) or laser diode (LD) is used as the light source, a favorable interference output can be obtained.
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Kodama Kazuhiko
Otsuka Takanori
Connolly Patrick J
Mitutoyo Corporation
Oliff & Berridg,e PLC
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