US 4,901,016 A · Device having a magnetic head for measuring magnetization characteristics of a magnetic thin film

Abstract

A magnetization characteristic measurement device includes a differential magnetic head, a signal generator for exciting the differential magnetic head with a low frequency signal, a magnetic head moving device for moving the differential magnetic head to a predetermined measuring position, a measured data converting device for sampling the differential output voltages from the magnetic head when it is positioned at the predetermined position and for converting the sampled values into digital values, and a measured data analyzing device for sequentially storing the obtained digital values and for calculating the magnetizing characteristics. The structure allows for simple and easy measurement of magnetization characteristics of magnetic thin films attached to a magnetic printing, magnetic tape, etc. by simply setting the magnetic thin film at a position. The result of the measurement is displayed on a display screen or indicated using a buzzing sound to thereby reduce inspection steps. Since the quality is displayed in reference to a predetermined standard, standardization of quality can be easily achieved.

Claims17

Dependent claims

A device for measuring magnetization characteristics of a magnetic thin film comprising:

a differential magnetic head;
a triangle wave signal generator for exciting said differential magnetic head with a triangle wave signal;
a magnetic head moving means for positioning said differential magnetic head to a position closely adjacent to the magnetic thin film;
a measured data converting means for sampling differential output voltages from said differential magnetic head when said differential magnetic head is positioned closely adjacent to the magnetic thin film and for converting the thus sampled output voltage values into respective digital values;
and a measured data analyzing means for sequentially storing said digital values converted by said converting means and for calculating magnetiaztion characteristics of the magnetic thin film.

2 more elements

A device for measuring magnetization characteristics of a magnetic thin film comprising:

a differential magnetic head;
a triangle wave signal generator for exciting said differential magnetic head with a triangle wave signal;
a magnetic head moving means for positioning said differential magnetic head to a position closely adjacent to the magnetic thin film;
a setting means for setting in advance a maximum acceptable value and a minimum acceptable value of the magnetization characteristics of the magnetic thin film;
a measured data converting means for sampling differential output voltages from said differential magnetic head when said differential magnetic head is positioned closely adjacent to the magnetic thin film, and for converting the thus sampled differential output voltage values into respective digital values;
and a measured data analyzing means for sequentially storing said digital values converted by said measured data converting means, and for calculating the magnetization characteristics of the magnetic thin film, and for comparing the thus calculated magnetization characteristics with said maximum acceptable value and minimum acceptable value set in advance by said setting means to thereby determine the acceptability of the magnetic thin film.

3 more elements

Dependencies are inferred from the claim text.

Device having a magnetic head for measuring magnetization characteristics of a magnetic thin film

Life of this patent

Device having a magnetic head for measuring magnetization characteristics of a magnetic thin film

Life of this patent

Abstract

Claims17