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Patent Searching and Data


Title:
MAGNETIC HEAD FOR MAGNETIC ENCODER
Document Type and Number:
Japanese Patent JPS6425009
Kind Code:
A
Abstract:
PURPOSE:To obtain a waveform being free substantially from hysteresis, by impressing a bias magnetic field which gives uniaxial anisotropy in the longitudinal direction of an MR element. CONSTITUTION:Four blocks B1-B4 of MR elements 13, each block comprising the elements in the number of (n) [(n) is a positive integer], are disposed parallel at prescribed intervals on a non-magnetic insulator substrate 11, and conductors 14 are formed so that they have exactly an angle of 90 deg. to the respective longitudinal axes of the elements 13. The blocks B1-B4 are bridged in wiring, and amplifier circuit 3 is connected to terminals P7 and P8, and a rectangular wave converter circuit 5 is connected to the circuit 3, whereby a magnetic head is constituted. When a current of several milliamperes is made to flow through the conductors 14 as current passages, so that such a magnetic field as not to lower sensitivity sharply be impressed as a bias magnetic field, uniaxial anisotropy is given in the direction of the longitudinal axes of the elements 13, and a bridge output is turned to be an original signal of a clear waveform at a terminal P. The original signal is converted into a pulse signal by the circuit 5, and a straight distance of an object moving straight and others can be measured therefrom exactly.

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Inventors:
KANEDA YASUSHI
MATSUMOTO TAKESHI
KOMARU YUKAKO
Application Number:
JP18175787A
Publication Date:
January 27, 1989
Filing Date:
July 21, 1987
Export Citation:
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Assignee:
NIKON CORP
International Classes:
G01B7/00; G01D5/245; (IPC1-7): G01B7/00; G01D5/245
Domestic Patent References:
JPS54120114A1979-09-18
JPS6070043A1985-04-20
Attorney, Agent or Firm:
Takeuchi Susumu