Title:
MAGNETIC SENSOR
Document Type and Number:
Japanese Patent JPH03130804
Kind Code:
A
Abstract:
PURPOSE:To secure the highly stable control even in such an adverse environment where the temperature conditions vary or the impact, etc., are easily received by providing a temporary storage and a differential amplifier in order to correct the difference of characteristics between two sensor coils. CONSTITUTION:A temporary storage 21 stores the unbalance value of bias levels between two symmetrical sensor coils L1 and L2 in absence of a magnetic mark. In an active state, the unbalance value is subtracted from outputs of both coils L1 and L2 and therefore never emerges as an output signal. Thus it is possible to correct in terms of circuit some characteristic variance produced at production of an energizing coil or the coils L1 and L2 and also to correct some attachment error of a magnetic sensor into a sensor unit. As a result, the production yield is improved and the production cost is reduced.
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Inventors:
WAKAUMI HIROO
Application Number:
JP26987489A
Publication Date:
June 04, 1991
Filing Date:
October 17, 1989
Export Citation:
Assignee:
NEC CORP
International Classes:
G05D1/02; G01R33/00; (IPC1-7): G01R33/00; G05D1/02
Attorney, Agent or Firm:
Sugano Naka