JPS5754801A - Approach sensor for displacement detection - Google Patents
Approach sensor for displacement detectionInfo
- Publication number
- JPS5754801A JPS5754801A JP55131369A JP13136980A JPS5754801A JP S5754801 A JPS5754801 A JP S5754801A JP 55131369 A JP55131369 A JP 55131369A JP 13136980 A JP13136980 A JP 13136980A JP S5754801 A JPS5754801 A JP S5754801A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- variable resistance
- displacement detection
- resonance circuit
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
- Electronic Switches (AREA)
Abstract
PURPOSE:To obtain a voltage, proportional to a distance, at a wide range, by a method wherein a feedback amount to a resonance circuit is minutely controlled. CONSTITUTION:A means, which can minutely control a feedback amount to a resonance circuit, is provided. For example, one end of an LC oscillating circuit 20 is connected to a base of a transistor 11, and the other end to an emitter via a variable resistance 5 to perform a positive feedback from a collector via a resistance 10. The output of the transistor 11 is inputted to another transistor 16 via a smoothing circuit 21. This causes changing of an inductance if an object to be detected approaches a detecting coil 1, and the change is produced into the damping of an oscillating output. The adjustment of the variable resistance 5 permits the rapid or the gradual stoppage of an oscillation to obtain a sensor having a high resolution.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55131369A JPS5754801A (en) | 1980-09-19 | 1980-09-19 | Approach sensor for displacement detection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55131369A JPS5754801A (en) | 1980-09-19 | 1980-09-19 | Approach sensor for displacement detection |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5754801A true JPS5754801A (en) | 1982-04-01 |
Family
ID=15056315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55131369A Pending JPS5754801A (en) | 1980-09-19 | 1980-09-19 | Approach sensor for displacement detection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5754801A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6179471A (en) * | 1984-09-20 | 1986-04-23 | テレクトロニクス・エヌヴエ− | Implant apparatus using telemeter coil in place of lead switch driven magnetically |
US5574366A (en) * | 1992-09-02 | 1996-11-12 | Tiefenbach Gmbh | Proximity switch having a variable sensing resistor for maintaining a constant total resistance |
-
1980
- 1980-09-19 JP JP55131369A patent/JPS5754801A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6179471A (en) * | 1984-09-20 | 1986-04-23 | テレクトロニクス・エヌヴエ− | Implant apparatus using telemeter coil in place of lead switch driven magnetically |
JPH0512949B2 (en) * | 1984-09-20 | 1993-02-19 | Telectronics Nv | |
US5574366A (en) * | 1992-09-02 | 1996-11-12 | Tiefenbach Gmbh | Proximity switch having a variable sensing resistor for maintaining a constant total resistance |
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