Shaft position encoder
Patent 4730110 Issued on March 8, 1988. Estimated Expiration Date: 
September 11, 2006. 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.
September 11, 2006. 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 3808431 Method for readout form multiscale encoders and a multiturn absolute angle-code converter Patent #: 4422065 InventorAssigneeApplicationNo. 06/906421 filed on 09/11/1986US Classes:250/231.18, Position indicating shaft encoders with means to generate a unique signal for each specific angular shaft position341/10, Constant distance code341/2, Plural denominationally related carriers (e.g., coarse/fine geared discs)341/9Having combined (e.g., denominational, combination code) coding patternExaminersPrimary: Westin, Edward P.Assistant: Wieland, Charles Attorney, Agent or FirmInternational ClassesG01D 5/347 (20060101)G01D 5/26 (20060101) AbstractA multi-turn shaft position encoder employs a plurality of encoder discs with successive speed reductions of 1:2n and the generation of n+1 bits of binary data representative of the angular position of the respective discs as the input shaft rotates. Specifically, a high-speed disc is coupled to an input shaft and low-speed disc means is coupled to the input shaft with a speed reduction of 1:2n relative to the high-speed disc. At least one group of n+1 bits of binary data representative of the angular position of the high-speed disc are generated as the input shaft rotates. A group of n+1 bits of data representative of the angular position of the low-speed disc means is generated as the input shaft rotates. Thus, the low-speed disc is divided in to 2n units per revolution but produces 2n+1 bits of data. The data is generated by the encoder in unit distance code and is then converted into fewer bits of data in natural binary code. The encoder has a high-speed disc in connection with which two groups of data bits are generated, one being shifted relative to the other. In addition, there is cumulative bit shifting from disc to disc. The n+1st bit is generated on the same track of each encoder disc as the nth bit by placing the corresponding data bit-generating sensors at angularly spaced apart positions relative to the same track.Other References
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