GB1311275A - Measuring apparatus employing optical gratings - Google Patents
Measuring apparatus employing optical gratingsInfo
- 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
Links
- 230000003287 optical effect Effects 0.000 title 1
- 239000000758 substrate Substances 0.000 abstract 3
- 238000006073 displacement reaction Methods 0.000 abstract 2
- VMQMZMRVKUZKQL-UHFFFAOYSA-N Cu+ Chemical compound [Cu+] VMQMZMRVKUZKQL-UHFFFAOYSA-N 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- CJOBVZJTOIVNNF-UHFFFAOYSA-N cadmium sulfide Chemical compound [Cd]=S CJOBVZJTOIVNNF-UHFFFAOYSA-N 0.000 abstract 1
- 229910052980 cadmium sulfide Inorganic materials 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 230000001788 irregular Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3220560A1 (en) * | 1981-06-01 | 1982-12-16 | Mitutoyo Mfg. Co., Ltd., Tokyo | PHOTOELECTRIC ENCODER |
DE4323712A1 (en) * | 1993-07-15 | 1995-01-19 | Heidenhain Gmbh Dr Johannes | Photoelectric length or angle measuring device |
DE4323624A1 (en) * | 1993-07-15 | 1995-01-19 | Heidenhain Gmbh Dr Johannes | Photoelectric device for measuring length or angle |
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 |
-
1969
- 1969-06-04 GB GB1311275D patent/GB1311275A/en not_active Expired
Cited By (10)
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 |
DE4323712A1 (en) * | 1993-07-15 | 1995-01-19 | Heidenhain Gmbh Dr Johannes | Photoelectric length or angle measuring device |
DE4323624A1 (en) * | 1993-07-15 | 1995-01-19 | Heidenhain Gmbh Dr Johannes | Photoelectric device for measuring length or angle |
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 |