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专利名称：Displacement information detection
apparatus
发明人：Hidejiro, Kadowaki, c/o Canon Kabushiki
Kaisha,Hiroshi, Sugiyama, c/o Canon
Kabushiki Kaisha,Yasuhiko, Ishida, c/o CanonKabushiki Kaisha,Makoto, Takamiya, c/oCanon Kabushiki Kaisha
申请号：EP91115995.2申请日：19910919公开号：EP0476677B1公开日：19970312
摘要：An apparatus for detecting a velocity of an object, includes a light source (1) forgenerating light having a wavelength λ, a light-transmission block (11) for receiving thelight from the light source, and guiding the light onto the object, and a photosensor (9)for detecting the light from the object (7) on which the light from the light-transmissionblock is incident. The light-transmission block is integrally constituted by a diffractiongrating (10) for diffracting the light from the light source to produce two diffractionlights (5a,5b), and an optical element for causing the two diffraction lights from thediffraction grating to be incident onto the object at a predetermined incident angle. Thediffraction grating and the optical element are arranged so as to have substantiallyconstant sinϑ/λ independently of a change in wavelength λ of the light from the lightsource where ϑ is the incident angle of each diffraction light onto the object. A velocity ofthe object is detected through detection by the photosensor.
申请人：CANON KK
地址：JP
国籍：JP
代理机构：Pellmann, Hans-Bernd, Dipl.-Ing.
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