GB1311275A - Measuring apparatus employing optical gratings - Google Patents

Measuring apparatus employing optical gratings

Info

Publication number
GB1311275A
GB1311275A GB1311275DA GB1311275A GB 1311275 A GB1311275 A GB 1311275A GB 1311275D A GB1311275D A GB 1311275DA GB 1311275 A GB1311275 A GB 1311275A
Authority
GB
United Kingdom
Prior art keywords
strips
photo
bus
sets
sensitive
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 by Ferranti PLC filed Critical Ferranti PLC
Publication of GB1311275A publication Critical patent/GB1311275A/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
    • G01D5/347—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 using displacement encoding scales
    • G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)

Abstract

1311275 Photo-electric displacement measurement FERRANTI Ltd 3 Sept 1970 [4 June 1969] 28193/69 Heading G1A [Also in Division G4] An index grating for photo-electric displacement measuring apparatus comprises a substrate carrying strips of photo-sensitive material on which are superimposed two sets at least of transparent, electrically conductive material, the strips of the respective sets alternating with one another and being connected to respective bus-bars, to provide a polyphase output. In the arrangement of Figs.1-5, the index grating 10 is transmissive. Light from lamp 1 is collimated at 2, passes through the movable index grating 10, and is reflected from scale grating 3 back to the photo-sensitive areas of the index. The latter is built up on a substrate of glass and comprises a set of conductive e.g. silver strips 12 connected to bus-bar 13, a set of photo-sensitive strips e.g. evaporated cadmium sulphide rendered photo-voltaic by cuprous ion doping, and the two sets of transparent, conducting strips 17, 19. This arrangement gives a two phase output on bus-bars 18, 20. By connecting the strips to form bus-bars, Fig.10 (not shown), a four phase output; or a two phase push-pull output may be provided. As many as ten phases may be provided. Other arrangements include: an opaque index grating, Fig.6-9 (not shown), in which the two sets of transparent, conducting strips are superimposed on photo-sensitive strips on an opaque substrate; reflective and transmissive gratings with irregular spacings.
GB1311275D 1969-06-04 1969-06-04 Measuring apparatus employing optical gratings Expired GB1311275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2819369 1969-06-04

Publications (1)

Publication Number Publication Date
GB1311275A true GB1311275A (en) 1973-03-28

Family

ID=10271771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1311275D Expired GB1311275A (en) 1969-06-04 1969-06-04 Measuring apparatus employing optical gratings

Country Status (1)

Country Link
GB (1) GB1311275A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220560A1 (en) * 1981-06-01 1982-12-16 Mitutoyo Mfg. Co., Ltd., Tokyo PHOTOELECTRIC ENCODER
DE4323624A1 (en) * 1993-07-15 1995-01-19 Heidenhain Gmbh Dr Johannes Photoelectric device for measuring length or angle
DE4323712A1 (en) * 1993-07-15 1995-01-19 Heidenhain Gmbh Dr Johannes Photoelectric length or angle measuring device
US5726442A (en) * 1994-12-22 1998-03-10 Renishaw Plc Opto-electronic scale reading apparatus having light-transmissive phase-encoding array of elongate spectral encoding elements
DE19641997A1 (en) * 1996-10-11 1998-04-16 Helmut Dr Baader Photodetector arrangement for determining position of object to be recorded
EP0843159A2 (en) * 1991-11-06 1998-05-20 Renishaw Transducer Systems Limited Opto-electronic scale-reading apparatus
US5886352A (en) * 1995-11-02 1999-03-23 Reinshaw Plc Readhead for an opto-electronic rotary encoder
US6775008B2 (en) 2000-02-23 2004-08-10 Renishaw Plc Opto-electronic scale reading apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220560A1 (en) * 1981-06-01 1982-12-16 Mitutoyo Mfg. Co., Ltd., Tokyo PHOTOELECTRIC ENCODER
US4499374A (en) * 1981-06-01 1985-02-12 Mitutoyo Mfg. Co., Ltd. Photoelectrical encoder employing an optical grating
EP0843159A2 (en) * 1991-11-06 1998-05-20 Renishaw Transducer Systems Limited Opto-electronic scale-reading apparatus
DE4323624A1 (en) * 1993-07-15 1995-01-19 Heidenhain Gmbh Dr Johannes Photoelectric device for measuring length or angle
DE4323712A1 (en) * 1993-07-15 1995-01-19 Heidenhain Gmbh Dr Johannes Photoelectric length or angle measuring device
US5576537A (en) * 1993-07-15 1996-11-19 Dr. Johannes Heidenhain Gmbh Photoelectric position measuring system using gratings having specified dimensions to suppress harmonics
US5726442A (en) * 1994-12-22 1998-03-10 Renishaw Plc Opto-electronic scale reading apparatus having light-transmissive phase-encoding array of elongate spectral encoding elements
US5886352A (en) * 1995-11-02 1999-03-23 Reinshaw Plc Readhead for an opto-electronic rotary encoder
DE19641997A1 (en) * 1996-10-11 1998-04-16 Helmut Dr Baader Photodetector arrangement for determining position of object to be recorded
US6775008B2 (en) 2000-02-23 2004-08-10 Renishaw Plc Opto-electronic scale reading apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees