GB953449A - Improvements relating to apparatus for producing signals indicative of relative position - Google Patents
Improvements relating to apparatus for producing signals indicative of relative positionInfo
- Publication number
- GB953449A GB953449A GB2095861A GB2095861A GB953449A GB 953449 A GB953449 A GB 953449A GB 2095861 A GB2095861 A GB 2095861A GB 2095861 A GB2095861 A GB 2095861A GB 953449 A GB953449 A GB 953449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- voltage
- tooth pitch
- tooth
- arrangement
- 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
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
- G05D3/14—Control of position or direction using feedback using an analogue comparing device
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/38—Electric signal transmission systems using dynamo-electric devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
953,449. Measuring displacement electrically. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 6,1962 [June 9, 1961], No. 20958/61. Heading G1N. [Also in Division G4] A displacement transducer comprises a member 1 having an electrically conductive toothed profile, which is capacitively coupled to a movable member 2 itself comprising at least three equally spaced conductive strips S 1 , S 2 per tooth pitch which extend transversely to the direction of movement, all strips having a similar positional relationship to each tooth being electrically connected into a set, and the sets being connected to a transformer arrangement T which produces a displacement dependent output. In an arrangement in which there are four strips s to the tooth pitch P, two sets of strips comprising respectively S 1 , S 5 , S 9 &c. and strips S 3 , S 7 &c. are connected to the ends of transformer winding S 2 and strips S 2 , S 6 , S 10 &c. and S 4 , S 3 &c, to transformer winding C 2 . The centre taps of the windings are mutually connected and a supply voltage is connected between lines 7 and 8. In the position shown, the capacities between S 1 , S 3 and the member 1 are equal and hence the voltage in the winding S 1 will be at a Minimum whereas the capacity difference between strips S 2 , S 4 with the member 1 will be at a Maximum and thus result in a voltage Maximum at C 1 . Movement of the member 2 in the directions of the arrows d results in an attenuation of the voltage at C 1 and an increase at S1 so that for any relative position of the members 1, 2, within one tooth pitch, a characterising voltage relationship will exist between the windings S 1 , C 1 . The above arrangement may be used in the reverse i.e. two voltages of a form respectively E cos # and -E sine # may be respectively fed to the windings S 1 , C 1 . The Specification states that if # is the angle proportional to the mechanical displacement of the strips relatively to a given station on a toothed member, then a voltage proportional to E sin (#-#) is obtained at the conductors 7, 8 and may be used to control a positional servo system. In order to obtain a voltage output which is more closely sinusoidal, the strips s may be skewed from otherwise their 90 degrees relative angle to the direction of member movement. The profile of each tooth on the member 1 may be changed from that shown, to one in which arcs of a circle subtend 90 degrees at their centre and the curves intersect 90 degrees. The Specification shows an alternative arrangement in which there are six strips s to the tooth pitch, and also transformer configurations which permit the trimming out or compensation for electrical errors caused by manufacturing tolerances. To avoid unbalancing effects arising from leakage resistance, a guard ring technique may be used by providing a conductive screen connected to the junction 7 and which crosses any leakage path between members 1, 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2095861A GB953449A (en) | 1961-06-09 | 1961-06-09 | Improvements relating to apparatus for producing signals indicative of relative position |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2095861A GB953449A (en) | 1961-06-09 | 1961-06-09 | Improvements relating to apparatus for producing signals indicative of relative position |
Publications (1)
Publication Number | Publication Date |
---|---|
GB953449A true GB953449A (en) | 1964-03-25 |
Family
ID=10154710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2095861A Expired GB953449A (en) | 1961-06-09 | 1961-06-09 | Improvements relating to apparatus for producing signals indicative of relative position |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB953449A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2553532A1 (en) * | 1983-10-12 | 1985-04-19 | Varian Associates | CAPACITIVE MASK ALIGNMENT DEVICE |
EP0184584A2 (en) * | 1983-11-11 | 1986-06-18 | Mauser-Werke Oberndorf GmbH | Capacitive length and angle measuring device |
US4607213A (en) * | 1983-10-12 | 1986-08-19 | Varian Associates, Inc. | Shielded capacitive mask aligner |
US4654581A (en) * | 1983-10-12 | 1987-03-31 | Hewlett-Packard Company | Capacitive mask aligner |
-
1961
- 1961-06-09 GB GB2095861A patent/GB953449A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2553532A1 (en) * | 1983-10-12 | 1985-04-19 | Varian Associates | CAPACITIVE MASK ALIGNMENT DEVICE |
DE3437502A1 (en) * | 1983-10-12 | 1985-04-25 | Varian Associates, Inc., Palo Alto, Calif. | ALIGNMENT DEVICE |
GB2148515A (en) * | 1983-10-12 | 1985-05-30 | Varian Associates | Capacitive mask aligner |
US4607213A (en) * | 1983-10-12 | 1986-08-19 | Varian Associates, Inc. | Shielded capacitive mask aligner |
US4654581A (en) * | 1983-10-12 | 1987-03-31 | Hewlett-Packard Company | Capacitive mask aligner |
EP0184584A2 (en) * | 1983-11-11 | 1986-06-18 | Mauser-Werke Oberndorf GmbH | Capacitive length and angle measuring device |
EP0184584A3 (en) * | 1983-11-11 | 1988-02-03 | Mauser-Werke Oberndorf Gmbh | Capacitive length and angle measuring device |
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