Magnetic transducer head utilizing magnetoresistance effect
First Claim
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1. A magnetic transducer head utilizing magnetoresistance effect, comprising:
- a magnetoresistance effect sensing element means for sensing a signal magnetic field on a travelling magnetic recording medium;
means for applying a high frequency magnetic field to said sensing element means;
means for obtaining an output from said sensing element means;
means for rectifying said output to form a rectified signal; and
low pass filter means supplied with said rectified signal for deriving an output corresponding to said signal magnetic field.
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Abstract
A magnetoresistance effect type magnetic transducer head apparatus comprises a magnetoresistance effect sensing element, means for applying a high-frequency magnetic field to the sensing element, means for taking-out an output signal from the sensing element, a filter for taking-out the high-frequency component of the output, and another filter for rectifying the output and taking-out the low-frequency component. The magnetic head apparatus may be constructed as a digital circuit so that a multi-channel apparatus can be easily implemented.
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Citations
15 Claims
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1. A magnetic transducer head utilizing magnetoresistance effect, comprising:
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a magnetoresistance effect sensing element means for sensing a signal magnetic field on a travelling magnetic recording medium; means for applying a high frequency magnetic field to said sensing element means; means for obtaining an output from said sensing element means; means for rectifying said output to form a rectified signal; and low pass filter means supplied with said rectified signal for deriving an output corresponding to said signal magnetic field. - View Dependent Claims (2, 3, 4)
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5. A magnetic transducer head utilizing magnetoresistance effect, comprising:
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a magnetoresistance effect sensing element means for sensing a signal magnetic field on a travelling magnetic recording medium; means for deriving a high frequency signal; means for applying a high frequency magnetic field synchronized with said high frequency signal to said sensing element means; means for obtaining an output from said sensing element means; means for multiplying said output with said high frequency signal to derive a multiplied signal; and low pass filter means supplied with said multiplied signal for deriving at an output thereof an output signal corresponding to said signal magnetic field. - View Dependent Claims (6, 7, 8)
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9. A magnetic transducer head utilizing magnetoresistance effect, comprising:
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first and second magnetoresistance effect sensing element means each for respectively sensing a first and second signal magnetic field; first means for deriving a first high frequency signal; second means for deriving a second high frequency signal having a phase difference of π
/4 relative to said first high frequency signal;means for applying a high frequency magnetic field synchronized with said first and said second high frequency signals to said first and said second sensing element means respectively; means for obtaining a composite output from said first and said second sensing element means; first means for multiplying said composite output with said first high frequency signal to derive a first multiplied signal; first low pass filter means supplied with said first multiplied signal for deriving an output corresponding to said first signal magnetic field; second means for multiplying said composite output with said second high frequency signal to derive a second multiplied signal; and second low pass filter means supplied with said second multiplied signal for deriving an output corresponding to said second signal magnetic field. - View Dependent Claims (10)
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11. A magnetic transducer head utilizing magnetoresistance effect, comprising:
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a magnetoresistance effect sensing element means for sensing a signal magnetic field on a travelling magnetic recording medium; means for deriving a high frequency signal; means for applying a high frequency magnetic field synchronized with said high frequency signal to said sensing element means; means for deriving an output from said sensing element means; sample-hold means for sampling and holding said output in synchronization with a sampling pulse having a frequency which is twice a frequency of said high frequency signal and for deriving a series of sampling outputs; A/D converter means for converting said sampling outputs of said sample-hold means in synchronization with said sampling pulse; and digital filter means supplied with an output of said A/D converter means for deriving an output signal comprising a series of mean values formed from digitalized sampling outputs. - View Dependent Claims (12, 13, 14)
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15. A magnetic transducer head utilizing magnetoresistance effect, comprising:
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a magnetoresistance effect sensing element means for sensing a signal magnetic field on a travelling magnetic recording medium; means positioned adjacent said sensing element means for applying a high frequency magnetic field to said sensing means, said means connecting to a high frequency signal source; said magnetoresistance effect sensing element means connecting to a current source and also to a switch means and to an inverter, said switch means being controlled by said high frequency wave generator source so as to selectively switch through the output from the magnetoresistance effect sensing element means in either inverted or non-inverted fashion; and a low pass filter means connecting to an output of said switch means.
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Specification