US3731007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head having a magneto-resistive bridge circuit
Assignee: Denki Onkyo Co Ltd
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Filing: 1971-04-19
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Granted: 1973-05-01
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Expires: 1991-04-19
Abstract
Abstract A magnetic head is provided having at least one loop-shaped magneto-resistance effect device to which two input terminals and two output terminals are alternately connected, four resistor portions being respectively formed between these four terminals. One of these resistor portions is selected as a detector portion and has an external surface arranged to contact a magnetic flux applying means, such as a magnetic tape.
Inventors
- 👤 N Masuda
- 👤 M Kuroyanagi
- 👤 H Kase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:03
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3993
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
90 words
A magnetic head for sensing a magnetic flux from a magnetic flux applying means comprised of a. at least one loop-shaped magneto-resistance effect device, and b. two input terminals and two output terminals alternately connected so that said device is divided into four resistor portions, said resistor portions comprising: 1. a detecting portion positioned for receiving said magnetic flux from said magnetic flux applying means, and 2. three balancing portions arranged so that the resistances between said terminals assume specied values in reference to the resistance of said detecting portion.
Claim 2
Dependent Claim
90 words
A magnetic head for sensing a magnetic flux from a magnetic flux applying means comprised of a. at least one loop-shaped magneto-resistance effect device, and b. two input terminals and two output terminals alternately connected so that said device is divided into four resistor portions, said resistor portions comprising: 1. a detecting portion positioned for receiving said magnetic flux from said magnetic flux applying means, and 2. three balancing portions arranged so that the resistances between said terminals assume specied values in reference to the resistance of said detecting portion.
Claim 3
Dependent Claim
23 words
three balancing portions arranged so that the resistances between said terminals assume specied values in reference to the resistance of said detecting portion.
Claim 4
Dependent Claim
23 words
three balancing portions arranged so that the resistances between said terminals assume specied values in reference to the resistance of said detecting portion.
Claim 5
Dependent Claim
47 words
A magnetic head according to claim 1, wherein at least one conductive shorting bar traverses at least one surface of said detecting portion to short opposite sides thereof, whereby the variation of the resistances of said detecting portion increases for a given variation in said magnetic flux.
Claim 6
Dependent Claim
67 words
A magnetic head according to claim 1, wherein the resistance value across each pair of terminals of said three balancing portions is made equal to the resistance value of said detecting portion when the magnetic flux from said magnetic flux applying means is not applied thereto such that the voltage across the output terminals is zero when said magnetic flux is not applied to said detecting portion.
Claim 7
Dependent Claim
62 words
A magnetic head according to claim 1, wherein at least one of three balancing portions is arranged so that the resistance value across its terminals is unequal to the resistance value when the magnetic flux is not applied to the detecting portion and a fixed voltage exists across the output terminals when the magnetic flux is not applied to the detecting portion.
Claim 8
Dependent Claim
27 words
A magnetic head according to claim 1, where at least one of the balancing portions is elongated and its body is extended away from the detecting portion.
Claim 9
Dependent Claim
26 words
A magnetic head according to claim 5, wherein a bias magnetic flux is applied to the body of the balancing portion extended from the detecting portion.
Claim 10
Dependent Claim
30 words
A magnetic head according to claim 1, wherein at least one balancing portion is provided with at least one metallic shorting bar for shorting opposite sides of said balancing portion.
Claim 11
Dependent Claim
19 words
A magnetic head according to claim 1, wherein a loop-shaped magneto-resistance effect device is provided on a magnetic plate.
Claim 12
Dependent Claim
18 words
A magnetic head according to claim 1, wherein a magneto-resistance effect device is positioned between two magnetic plates.
Claim 13
Dependent Claim
21 words
A magnetic head according to claim 9, wherein only the detecting portion is positioned between the upper and lower magnetic plates.
Claim 14
Dependent Claim
29 words
A magnetic head according to claim 1, wherein a plurality of loop-shaped magneto-resistance effect devices are integrally associated so that the input terminals can be connected to the devices.
Claim 15
Dependent Claim
33 words
A magnetic head according to claim 1, wherein an intermediate terminal is provided at at least one balancing portion and an adjusting resistor is parallel-connected to the balancing portion through the intermediate terminal.
Claim 16
Dependent Claim
40 words
A magnetic head according to claim 1, wherein a power supply is connected between the input terminals, and a load is connected between the output terminals and operates in response to the fluctuation of the voltage across the output terminals.
Claim 17
Dependent Claim
120 words
A magnetic head for sensing a magnetic flux from a magnetic flux applying means comprising: a. a substrate b. at least one endless looped-shaped magneto-resistance effect device of semiconductive material disposed on a surface of said substrate c. two input and two output terminals alternately contacting said magneto-resistance effect device to divide the latter into four magneto-resistive portions, a first of said portions being a detecting portion arranged along an edge of said substrate and adapted to directly receive said magnetic flux from said magnetic flux applying means, the remaining three portions being balancing portions arranged away from said edge of said substrate and so that the resistances between consecutive terminals assume specified values in reference to the detecting portion.
Claim 18
Dependent Claim
120 words
A magnetic head for sensing a magnetic flux from a magnetic flux applying means comprising: a. a substrate b. at least one endless looped-shaped magneto-resistance effect device of semiconductive material disposed on a surface of said substrate c. two input and two output terminals alternately contacting said magneto-resistance effect device to divide the latter into four magneto-resistive portions, a first of said portions being a detecting portion arranged along an edge of said substrate and adapted to directly receive said magnetic flux from said magnetic flux applying means, the remaining three portions being balancing portions arranged away from said edge of said substrate and so that the resistances between consecutive terminals assume specified values in reference to the detecting portion.
Claim 19
Dependent Claim
47 words
A magnetic head according to claim 14, wherein at least one conductive shorting bar traverses at least one surface of said detecting portion to short opposite sides thereof, whereby the variation of the resistances of said detecting portion increases for a given variation in said magnetic flux.
Claim 20
Dependent Claim
35 words
A magnetic head according to claim 15, wherein said substrate comprises an inert base layer and a magnetic plate disposed on top of said base layer, said magneto-resistance device being juxtaposed to said magnetic plate.
Claim 21
Dependent Claim
19 words
A magnetic head according to claim 16, wherein said detecting portion is sandwiched between a pair of magnetic plates.
Claim 22
Dependent Claim
54 words
A magnetic head according to claim 15, wherein two of said balancing portions extend from opposite sides of said detecting portion in a direction away from said edge of said substrate and the third balancing portion is U-shaped, the open ends facing said detecting portion and extending from said two of said balancing portions.
Claim 23
Dependent Claim
27 words
A magnetic head according to claim 15, wherein said magneto-resistance effect device is shaped as a pair of concentric U-shaped portions connected at the open ends thereof.
Claim 24
Dependent Claim
53 words
A magnet head according to claim 15, wherein two of said balancing portions extend from opposite sides of said detecting portion in a direction away from said edge of said substrate and the third of said balancing portions being spaced from said detecting portion and disposed between said two of said balancing portions.
Claim 25
Dependent Claim
44 words
A magnetic head according to claim 20 comprising at least two of said magneto-resistance effect devices, wherein a first input termInal from a first magneto-resistance effect device is connected by an electrical conductor to a first input terminal of a second magneto-resistance effect device.
Claim 26
Dependent Claim
29 words
A magnetic head according to claim 21, wherein the second input terminals of said first and second magneto-resistance effect devices are connected to said electrical conductor by variable resistors.
Claim 27
Dependent Claim
36 words
A magnetic head according to claim 21, wherein one end of a detecting portion of a first magneto-resistance effect device is electrically connected to one end of a detecting portion of a second magneto-resistance effect device.
Claim 28
Dependent Claim
16 words
A magnetic head according to claim 21 comprising at least three of said magneto-resistance effect devices.
Claim 29
Dependent Claim
42 words
A magnetic head according to claim 24 wherein first and second magneto-resistance effect devices are interconnected at a pair of input terminals and said second and a third of said magneto-resistance effect devices are electrically interconnected at another pair of input terminals.
Claim 30
Dependent Claim
32 words
A magnetic head according to claim 21,wherein an intermediate part of one of said balancing portions is connected through a variable resistor to the output terminal joining two of said balancing portions.
Claim 31
Dependent Claim
30 words
A magnetic head according to claim 26, wherein said intermediate part is positioned between an input terminal and the output terminal to which it is connected by said variable resistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |