GB1227942A - - Google Patents

Info

Publication number
GB1227942A
GB1227942A GB1227942DA GB1227942A GB 1227942 A GB1227942 A GB 1227942A GB 1227942D A GB1227942D A GB 1227942DA GB 1227942 A GB1227942 A GB 1227942A
Authority
GB
United Kingdom
Prior art keywords
trapezium
rectangle
signal
march
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1227942A publication Critical patent/GB1227942A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses
    • G01D5/366—Particular pulse shapes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Solid State Image Pick-Up Elements (AREA)

Abstract

1,227,942. Measuring position photoelectrically. GEORGE RICHARDS & CO. Ltd. March 14, 1968 [March 16, 1967j, No.51051/70. Divided out of 1, 227, 941. Heading G1A. In position signal generating apparatus, a rectangle is moved relative to a symmetrical trapezium and a signal is generated proportional to the overlapping areas of the rectangle and trapezium. The rectangle or the trapezium may be part of a grating carried by an object whose position is to be signalled relative to a head carrying the other shaped aperture, and the signal is derived by photo-cells spaced apart as described in Specification 1, 227, 941. The length of the parallel sides of the trapezium are preferably in the ratio of 1:3 and the longer of the parallel sides is equal to the width of the rectangle. The grating pitch is twice the width of the rectangle. The trapezium aperture may be shaped as a double trapezium formed by rotation of a trapezium about its longer side.
GB1227942D 1967-03-16 1967-03-16 Expired GB1227942A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5105170 1967-03-16

Publications (1)

Publication Number Publication Date
GB1227942A true GB1227942A (en) 1971-04-15

Family

ID=10458454

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1227942D Expired GB1227942A (en) 1967-03-16 1967-03-16

Country Status (1)

Country Link
GB (1) GB1227942A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541829A1 (en) * 1991-11-04 1993-05-19 Dr. Johannes Heidenhain GmbH Device to create periodic signals without harmonics
EP0750179A1 (en) 1995-06-22 1996-12-27 Dr. Johannes Heidenhain GmbH Position measuring device
GB2432662A (en) * 2005-11-28 2007-05-30 Avago Tech Ecbu Ip Optical encoder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541829A1 (en) * 1991-11-04 1993-05-19 Dr. Johannes Heidenhain GmbH Device to create periodic signals without harmonics
EP0750179A1 (en) 1995-06-22 1996-12-27 Dr. Johannes Heidenhain GmbH Position measuring device
US5726445A (en) * 1995-06-22 1998-03-10 Dr. Johannes Heidenhain Gmbh Device for obtaining harmonic-free signals
GB2432662A (en) * 2005-11-28 2007-05-30 Avago Tech Ecbu Ip Optical encoder
US7399956B2 (en) 2005-11-28 2008-07-15 Avago Technologies Ecbuip Pte Ltd Optical encoder with sinusoidal photodetector output signal
GB2432662B (en) * 2005-11-28 2009-09-23 Avago Tech Ecbu Ip Optical encoder

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee