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Title: US4901073: Encoder for measuring the absolute position of moving elements
[ Derwent Title ]

Country: US United States of America

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21 pages

Inventor: Kibrick, Robert I.; Santa Cruz, CA

Assignee: Regent of the University of California, Alameda, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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Published / Filed: 1990-02-13 / 1988-03-30

Application Number: US1988000176109

IPC Code: Advanced: G01D 5/245; H03M 1/30;
IPC-7: H03M 1/22;

ECLA Code: G01D5/245C1B; H03M1/30R;

U.S. Class: Current: 341/013; 341/003;
Original: 341/013; 341/003;

Field of Search: 341/013 250/231 SE,237 G 235/462

Priority Number:
1988-03-30  US1988000176109
1986-12-04  US1986000938164

Abstract:     An optical encoding system for determining the absolute position of a movable member relative to a stationary member. For example, a bar-code scanner may be supported by a stationary member for scanning bar-code symbols in its field of view. An encoding band may be supported by the movable member so that a portion of the band is scanned by the bar-code scanner. Affixed to or otherwise marked on the band is a sequential series of bar-code symbols, each symbol encoding the absolute position of its location on the band. A bar-code decoding system, actuated by the signals produced by the bar-code scanner, decodes the bar-code symbol scanned by the scanner, and determines the absolute position of a movable member relative to the stationary member.

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

Primary / Asst. Examiners: Shoop, Jr., William M.; Hoff, Marc S.

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1986000938164 1986-12-04    1988-04-05  Encoder for measuring both incremental and absolute positions of moving elements

Parent Case:

    This application is a continuation-in-part of application Ser. No. 938,164, filed Dec. 4, 1986, now U.S. Pat. No. 4,736,187 issued Apr. 5, 1988.

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First Claim:
Show all 14 claims
What is claimed is:     1. An encoding system for determining the absolute position of a movable member relative to a stationary member, including in combination:
  • an encoding band supported by one said member comprising a series of bar-code symbols disposed at regular intervals along said band, each said symbol being distinctly different from every other said symbol and each comprising a pattern of bars and spaces for encoding the absolute position corresponding to the location of its symbol along said band,
  • reading means rigidly supported by the other said member for scanning said bar-code symbols on said encoding band including means for generating an analog signal voltage,
  • said movable member being capable of both discrete and continuous motion in two directions, and
  • decoding means actuated by said analog signal voltage for determining the absolute position of said movable member relative to said stationary member,
  • whereby said absolute position can be determined solely from said system without dependence on any additional information external to said system.

Background / Summary: Show background / summary

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Description: Show description

Forward References: Show 194 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (194)   |   Backward references (5)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 9pp US4074258  1978-02 Dore et al.  Societe d'Applications Generales d'Electricite et de Mecanique (SAGEM) Device for reading displacements of a movable member
Get PDF - 16pp US4631519  1986-12 Johnston  Rosemount Engineering Company Limited Position measuring apparatus
Get PDF - 12pp US4633224  1986-12 Gipp et al.  Caterpillar Inc. Absolute and incremental optical encoder
Get PDF - 8pp US4720699  1988-01 Smith   Optical encoder using line array detectors
Get PDF - 86pp US4736187  1988-04 Kilbrick et al.  The Regents of The University of California Encoder for measuring both incremental and absolute positions of moving elements
Foreign References: None

Other Abstract Info: DERABS G88-112590

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