JPS6439523A - Magnetic displacement detecting device - Google Patents
Magnetic displacement detecting deviceInfo
- Publication number
- JPS6439523A JPS6439523A JP19714987A JP19714987A JPS6439523A JP S6439523 A JPS6439523 A JP S6439523A JP 19714987 A JP19714987 A JP 19714987A JP 19714987 A JP19714987 A JP 19714987A JP S6439523 A JPS6439523 A JP S6439523A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- phase
- couples
- heads
- theta1
- 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
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
PURPOSE:To enable absolute displacement detection with high resolution even in a range exceeding the pitch of magnetic scales by providing a couple of read heads for each magnetic scale array, exciting each couple of heads by common signal sources, and utilizing the phase difference of signals between the couples. CONSTITUTION:The couples of read heads 24A and 24B, and 24C and 24D are arranged at a specific interval corresponding to the magnetic scales which differ in scale pitch, and excited by signal sources 30 and 40, commonly. The magnetic scales and read heads are moved relatively and then the couples of heads output 90 deg. out-of-phase signals e1 and e2, and f1 and f2, phase- modulated signals e3 and f3 are outputted through mixing circuits 26e and 26f and BPFs 27e and 27f as the signals between couples corresponding to the magnetic scales, and their phase angles are theta1 and theta2. A phase comparing circuit 52 generates signals (h) and (i) which go up to high level only between the rising zero-cross points of a reference signal (g) and the signals e3 and f3. Counted values c1 and c2 of clock pulses CP from an oscillator 42 which are pressed through AND gates 54H and 54I during the period correspond to a phase angle theta1 and a phase difference theta1-theta2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19714987A JPS6439523A (en) | 1987-08-06 | 1987-08-06 | Magnetic displacement detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19714987A JPS6439523A (en) | 1987-08-06 | 1987-08-06 | Magnetic displacement detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6439523A true JPS6439523A (en) | 1989-02-09 |
Family
ID=16369577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19714987A Pending JPS6439523A (en) | 1987-08-06 | 1987-08-06 | Magnetic displacement detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6439523A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04130219A (en) * | 1990-09-20 | 1992-05-01 | Sony Magnescale Inc | Position detecting apparatus |
JPH04130218A (en) * | 1990-09-20 | 1992-05-01 | Sony Magnescale Inc | Position detecting apparatus |
JP2002310610A (en) * | 2001-04-17 | 2002-10-23 | Massuru Kk | Position detection method and position detector |
-
1987
- 1987-08-06 JP JP19714987A patent/JPS6439523A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04130219A (en) * | 1990-09-20 | 1992-05-01 | Sony Magnescale Inc | Position detecting apparatus |
JPH04130218A (en) * | 1990-09-20 | 1992-05-01 | Sony Magnescale Inc | Position detecting apparatus |
JP2002310610A (en) * | 2001-04-17 | 2002-10-23 | Massuru Kk | Position detection method and position detector |
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