EP0092371A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magnetic reproduction system
Assignee: Toshiba Corp
•
Filing: 1983-04-13
•
Granted: —
•
Expires: 2003-04-13
Abstract
Abstract A capacitance element (10) includes as an interelectrode substance a magnetic body (11) for detecting a magnetic field formed by a magnetic recording medium (21). A tuned circuit (10, 14) includes the capacitance element as a tuning element and receives a signal from a high-frequency oscillator (16). The magnetic characteristics of the magnetic body change with changes in the magnetic field formed by the magnetic recording medium. The high-frequency signal output from the tuned circuit changes with changes in the magnetic characteristics of the magnetic body. A detecting circuit (20) detects the changes in the high-frequency signal output so as to reproduce signals recorded on the magnetic recording medium.
Inventors
- 👤 Junichi Akiyama
- 👤 Shu Chiba
- 👤 Norikazu Sawazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:31
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G01; G01R; G01R33/00; G01R33/02; G11B5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A magnetic reproducer comprising: a tuned circuit consisting of a capacitance element (10) and an inductance element (14); means (16) for supplying a high-frequency input signal to said tuned circuit; and a detecting circuit (20) for detecting a change in a high-frequency output signal from said tuned circuit, characterized in that a magnetic body (11) is interposed between electrodes (12, 13) of said capacitance element, a change in a magnetic characteristic of said magnetic body being dependent on a change in a magnetic field formed by a magnetic recording medium (21), and the change in the high-frequency output signal is dependent on the magnetic characteristic of said magnetic body, so as to allow reproduction of signals recorded on said magnetic recording medium.
Claim 2
Dependent Claim
122 words
A magnetic reproducer comprising: a tuned circuit consisting of a capacitance element (10) and an inductance element (14); means (16) for supplying a high-frequency input signal to said tuned circuit; and a detecting circuit (20) for detecting a change in a high-frequency output signal from said tuned circuit, characterized in that a magnetic body (11) is interposed between electrodes (12, 13) of said capacitance element, a change in a magnetic characteristic of said magnetic body being dependent on a change in a magnetic field formed by a magnetic recording medium (21), and the change in the high-frequency output signal is dependent on the magnetic characteristic of said magnetic body, so as to allow reproduction of signals recorded on said magnetic recording medium.
Claim 3
Dependent Claim
51 words
A magnetic reproducer according to claim 1, characterized in that said detecting circuit detects the change in the high-frequency output signal by a change in a tuning frequency of said tuned circuit, the change in the tuning frequency being dependent on a change in a magnetic permeability of said magnetic body.
Claim 4
Dependent Claim
21 words
A magnetic reproducer according to claim 2, characterized in that the magnetic permeability of said magnetic body changes by ferromagnetic resonance.
Claim 5
Dependent Claim
48 words
A magnetic reproducer according to claim 1, characterized in that said detecting circuit detects the change in the high-frequency output signal by a change in a Q of said tuned circuit, the change in the Q being dependent on a change in high-frequency loss of said magnetic body.
Claim 6
Dependent Claim
21 words
A magnetic reproducer according to claim 4, characterized in that the high-frequency loss of said magnetic body changes by ferromagnetic resonance.
Claim 7
Dependent Claim
47 words
A magnetic reproducer according to claim 1, characterized in that a laminated body comprising pluralities of said magnetic bodies (11) and dielectric bodies (22) which are arranged alternately is interposed between said electrodes (12, 13) of said capacitance element to be parallel to surfaces of said electrodes.
Claim 8
Dependent Claim
31 words
A magnetic reproducer according to claim 1, characterized in that a mixture of said magnetic body (11) and a dielectric body (22) is filled between said electrodes of said capacitance element.
Claim 9
Dependent Claim
33 words
A magnetic reproducer according to claim 1, wherein a mixture of said magnetic body (11), a dielectric body (22) and a metallic body (23) is filled between said electrodes of said capacitance element.
Claim 10
Dependent Claim
41 words
A magnetic reproducer according to claim 1, characterized in that surfaces of said electrodes of said capacitance element are arranged to be substantially perpendicular to said magnetic recording medium, and said magnetic recording medium moves along said capacitance element relative thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.