GB2271031B - Optical apparatus - Google Patents

Optical apparatus

Info

Publication number: GB2271031B
Authority: GB; United Kingdom
Prior art keywords: optical apparatus; optical
Prior art date: 1992-09-21
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 - Fee Related

Application number

GB9219938A

Other versions

GB9219938D0 (en

GB2271031A (en

Inventor

James Stewart Johnston

Mark Seton Beales

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.)

Emerson Process Management Ltd

Original Assignee

Rosemount Ltd

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.)

1992-09-21

Filing date

1992-09-21

Publication date

1995-07-26

1992-09-21 Application filed by Rosemount Ltd filed Critical Rosemount Ltd

1992-09-21 Priority to GB9219938A priority Critical patent/GB2271031B/en

1992-11-04 Publication of GB9219938D0 publication Critical patent/GB9219938D0/en

1994-03-30 Publication of GB2271031A publication Critical patent/GB2271031A/en

1995-07-26 Application granted granted Critical

1995-07-26 Publication of GB2271031B publication Critical patent/GB2271031B/en

2012-09-21 Anticipated expiration legal-status Critical

Status Expired - Fee Related legal-status Critical Current

Links

230000003287 optical effect Effects 0.000 title 1

Classifications

- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
- H03M1/245—Constructional details of parts relevant to the encoding mechanism, e.g. pattern carriers, pattern sensors
- 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
- G01D5/34715—Scale reading or illumination devices
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
- H03M1/28—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding
- H03M1/282—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding of the pattern-shifting type, e.g. pseudo-random chain code

Landscapes

Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Theoretical Computer Science (AREA)
Optical Transform (AREA)

GB9219938A 1992-09-21 1992-09-21 Optical apparatus Expired - Fee Related GB2271031B (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
GB9219938A GB2271031B (en)	1992-09-21	1992-09-21	Optical apparatus

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
GB9219938A GB2271031B (en)	1992-09-21	1992-09-21	Optical apparatus

Publications (3)

Publication Number	Publication Date
GB9219938D0 GB9219938D0 (en)	1992-11-04
GB2271031A GB2271031A (en)	1994-03-30
GB2271031B true GB2271031B (en)	1995-07-26

Family

ID=10722247

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB9219938A Expired - Fee Related GB2271031B (en)	1992-09-21	1992-09-21	Optical apparatus

Country Status (1)

Country	Link
GB (1)	GB2271031B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US7348543B2 (en)	2003-01-16	2008-03-25	Yaskawa Eshed Technologies Ltd.	Optical encoder with hollow light guide for indicating the angular position of a rotary shaft

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1585561A (en) *	1977-09-21	1981-03-04	Marconi Co Ltd	Optical position sensing arrangements

1992
- 1992-09-21 GB GB9219938A patent/GB2271031B/en not_active Expired - Fee Related

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB1585561A (en) *	1977-09-21	1981-03-04	Marconi Co Ltd	Optical position sensing arrangements

Also Published As

Publication number	Publication date
GB9219938D0 (en)	1992-11-04
GB2271031A (en)	1994-03-30

Legal Events

Date	Code	Title	Description
2004-05-12	PCNP	Patent ceased through non-payment of renewal fee	Effective date: 20030921

Publication	Publication Date	Title
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