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Title: US4736187: Encoder for measuring both incremental and absolute positions of moving elements
[ Derwent Title ]


Country: US United States of America

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86 pages

 
Inventor: Kibrick, Robert I.; Santa Cruz, CA
Delaney, Calvin R.; Aptos, CA

Assignee: The Regents of The University of California, Berkeley, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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Published / Filed: 1988-04-05 / 1986-12-04

Application Number: US1986000938164

IPC Code: Advanced: G01D 5/245; G02B 23/16; H03M 1/30;
Core: G01D 5/12; H03M 1/22; more...
IPC-7: H03M 1/22; H03M 1/30;

U.S. Class: Current: 341/003; 250/231.14; 250/231.18; 250/237.G; 341/013;
Original: 340/347.P; 250/231.SE; 250/237.G;

Field of Search: 340/347 P 250/231 SE,237 G

Priority Number:
1986-12-04  US1986000938164

Abstract: An optical encoding system for determining the absolute and the incremental positions of a movable member relative to a stationary member. For example, three stationary light sources may be supported by the stationary member for emitting three narrow light beams on respective paths. An encoding band may be supported by the movable member in the paths of the light beams. The band has a timing and incremental encoding track comprising at least one series of alternating light-blocking stripes and light-passing stripes, and a data track comprising a series of absolute position tags alternating with spacers, each tag being framed by start bits. A read head may be supported by the stationary member and has three optical sensors, one for each light beam, two preferably in quadrature with each other for the timing and incremental encoding track, and one for the data track. Each optical sensor includes light sensors for generating an analog signal voltage. A decoding system actuated by these analog signal voltages determines the incremental and absolute position of the movable member relative to the stationary member.

Attorney, Agent or Firm: Owen, Wickersham & Erickson ;

Primary / Asst. Examiners: Miller, Charles D.;

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First Claim:
Show all 69 claims
What is claimed is:     1. An encoding system for determining the absolute and the incremental positions of a movable member relative to a stationary member, including in combination:
  • an encoding band supported by one said member and having
  • a timing and incremental encoding track comprising at least one series of alternating activating stripes and non-activating stripes, and
  • a single data track comprising a series of absolute position tags disposed at regular intervals along said data track and alternating with spacers that are identical to each other, each said tag being framed by start bits and being distinctly different from every other said tag and each comprising a serial bit stream for encoding the absolute position corresponding to the location of its tag along said data track,
  • reading means supported by the other said member and having three non-sweeping sensing means, two in quadrature with each other for said timing and incremental encoding track, and one for said data track, each said sensing means having a single energy-source-energy-sensor pair including means for generating an analog signal voltage,
  • said members being capable of both discrete and continuous motion in both directions, and
  • decoding means actuated by said analog signal voltages for determining the incremental and absolute positions of said movable member relative to said stationary member,
  • whereby said absolute and incremental positions can be determined solely from said system without dependence or any additional information external to said system.


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Forward References: Show 32 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (32)   |   Backward references (5)   |   Citation Link

Buy
PDF
Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 5pp US3531798  1970-09 Dureau   NUMERICAL CODING
Get PDF - 13pp US3702471  1972-11 Kennedy  Ferranti, Limited MEASURING APPARATUS
Get PDF - 13pp US3982106  1976-09 Stutz  Contraves AG System for measuring the longitudinal or angular displacement of a movable component
Get PDF - 24pp US4628298  1986-12 Hafle  BEI Motion Systems Company, Inc. Chain code encoder
Get PDF - 12pp US4633224  1986-12 Gipp  Caterpillar Inc. Absolute and incremental optical encoder
       
Foreign References: None

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