Photoelectric encoder having a grating substrate with integral light emitting elements
Patent 5155355 Issued on October 13, 1992. Estimated Expiration Date: 
April 25, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 25, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2879405 2997630 3129416 3892961 Distance measuring device Indicating element and method of manufacturing same Photoelectrical encoder employing an optical grating Non-imaging illumination incidence angle detection system Action for upright piano Incremental encoder Patent #: 4963733 InventorAssigneeApplicationNo. 684925 filed on 04/25/1991US Classes:250/237G, Gratings (moire fringes)250/214PR, Photosensitive rheostat type250/231.16Using phase difference of output signals from plural photodetectorsExaminersPrimary: Nelms, David C.Assistant: Allen, S. Attorney, Agent or FirmForeign Patent References
International ClassesG01B 011/00G08C 009/06 AbstractA photoelectric encoder characterized in that the grating substrate on the light emission side is composed of a plate-like light emitting element and in that light shielding members in the form of a thin film are arranged at regular intervals on the surface of the substrate which faces the reference grating. Since the light emitting element and the grating substrate on the light emission side are integrally provided with each other, reducing in the size and the weight of the apparatus and the number of parts is enabled. | |
