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 Title: |
US4901073:
Encoder for measuring the absolute position of moving elements
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Kibrick, Robert I.; Santa Cruz, CA
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| 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
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| Application Number: |
US1988000176109
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| IPC Code: |
Advanced:
G01D 5/245;
H03M 1/30;
IPC-7:
H03M 1/22;
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| ECLA Code: |
G01D5/245C1B; H03M1/30R;
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| U.S. Class: |
Current:
341/013;
341/003;
Original:
341/013;
341/003;
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| Field of Search: |
341/013
250/231 SE,237 G
235/462
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| Priority Number: |
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| 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.
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| Attorney, Agent or Firm: |
Owen, Wickersham & Erickson ;
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| Primary / Asst. Examiners: |
Shoop, Jr., William M.; Hoff, Marc S.
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| INPADOC Legal Status: |
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| Parent Case: |
CROSS-REFERENCE TO RELATED APPLICATION
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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| Family: |
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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.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 186 U.S. patent(s) that reference this one
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