Encoder for measuring both incremental and absolute positions of moving elements

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4736187
SERIAL NO

06938164

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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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.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE REGENTS OF THE UNIVERSITY OF CALIFORNIAOAKLAND, CA6611

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Delaney, Calvin R Aptos, CA 2 85
Kibrick, Robert I Santa Cruz, CA 3 290

Cited Art Landscape

Patent Info (Count) # Cites Year
 
BEI Motion Systems Company, Inc. (1)
* 4628298 Chain code encoder 32 1984
 
CATERPILLAR INC. (1)
* 4633224 Absolute and incremental optical encoder 27 1985
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MARKEM-IMAJE CORPORATION (1)
7046267 Striping and clipping correction 11 2003
 
MARKEM CORPORATION (1)
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BOSE CORPORATION (1)
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MARKEM TAG, INC. (5)
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Pitney Bowes plc. (1)
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NEWPORT CORPORATION (1)
* 5852413 Virtual absolute position encoder 39 1997
 
Vernier Software & Technology, LLC (1)
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TOYOTA JIDOSHA KABUSHIKI KAISHA (1)
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AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD. (1)
* 7348545 System and method for optical encoding on two opposed surfaces of a pattern medium 1 2005
 
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NIKON CORPORATION (1)
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THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (2)
* 4914437 Encoder for measuring both incremental and absolute positions of moving elements 52 1988
* 4901073 Encoder for measuring the absolute position of moving elements 205 1988
 
NATIONAL CENTRAL UNIVERSITY (2)
* 7875844 Absolute-type encoder and method for detecting absolute position 8 2008
* 2010/0051,792 ABSOLUTE-TYPE ENCODER AND METHOD FOR DETECTING ABSOLUTE POSITION 4 2008
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
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* 6017114 Shifted element scanning/printing routine coordinated with media advance 17 1998
 
Marken Corporation (1)
7394479 Pulsed laser printing 11 2005
 
THALES (1)
* 7046172 Dual optical angular encoder 1 2003
 
RSF-ELEKTRONIK GESELLSCHAFT M.B.H. (1)
* 5294793 System for measuring lengths or angles with a high-velocity movable scanning unit 11 1992
 
CONTROL DEVICES, INC. (1)
* 7289041 Absolute position chain encoder 2 2006
 
ALLEN-BRADLEY COMPANY, LLC (1)
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CAREFUSION 303, INC. (1)
* 5534691 System for determining pumping mechanism position while limiting volume of fluid pumped 13 1994
 
BAXTER INTERNATIONAL INC. (1)
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TAMAGAWA SEIKI KABUSHIKI KAISHA (1)
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AVAGO TECHNOLOGIES GENERAL IP PTE. LTD. (2)
7385178 Reflective encoders with various emitter-detector configurations 10 2005
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DELPHI TECHNOLOGIES, INC. (1)
* 6577984 Device and method for digital position measuring 8 2000
 
CATERPILLAR INC. (3)
7191943 Robust barcode and reader for rod position determination 5 2004
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The Torrington Company (1)
6515471 Absolute position hall string sensor 8 2000
 
MEADE INSTRUMENTS CORPORATION (2)
* 6563636 Telescope system having an intelligent motor controller 19 1999
* 2008/0168,492 Celestial Viewing System With Video Display 2 2007
* Cited By Examiner