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
Links
- 241000826860 Trapezium Species 0.000 abstract 7
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.
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)
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 |
-
1967
- 1967-03-16 GB GB1227942D patent/GB1227942A/en not_active Expired
Cited By (6)
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 |