US3757154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic field on color television receivers apparatus for automatically eliminating the influence of the earth s
Assignee: Sony Corp
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Filing: 1971-03-03
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Granted: 1973-09-04
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Expires: 1991-03-03
Abstract
Abstract An apparatus for eliminating the influence of the earth''s magnetic field on color television receivers including a coil disposed adjacent the face of the cathode ray tube and solid state means sensitive to the earth''s magnetic field for generating a signal through the coils to compensate for different field effects as the positioning of the television set is varied.
Inventors
- 👤 T Okita
- 👤 J Inagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:42
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29; H01; H01J; H01J2229/00; H01J2229/0007; H01J2229/003; H01J2229/0038
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
336 words
An apparatus for automatically compensating for changes in the effect of the earth''s magnetic field on a color television receiver having a cathode ray tube with a front panel mounted in a plane parallel to the face of the cathode ray tube comprising: first, second and third detection means for sensing the earth''s magnetic field and producing voltages in response thereto, each of said means including at least one magnetoresistance element; said first, second and third detection means being arranged such that the second and third detection means are mounted at 45* to said first means and at 90* relative to each other; said first detection means lying in a vertical plane which is normal to the face of said cathode ray tube, said second and third detection means lying in planes normal to the face of said cathode ray tube, voltage sources respectively connected to said first, second and third detection means; first, second and third means for respectively amplyfying the outputs of the first, second and third detection means; a main coil mounted about the face of the cathode ray tube adjacent to the front panel of the cathode ray tube and lying in a vertical plane parallel to said face and extending around said cathode ray tube; a first pair of coils respectively mounted at the upper and lower left-hand portions of said cathode ray tube and lying in horizontal planes; a second pair of coils at the upper and lower right-hand portions of the cathode ray tube and lying in horizontal planes, means for applying the output of the first amplifying means to said main coil: means for applying the output of the second amplifying means to the first pair of coils: means for applying the output of the third amplifying means to said second pair of coils; and first, second and third magnetic flux collector means respectively disposed adjacent to and aligned with each of the first, second and third detection means so As to enhance the sensitivity of said means.
Claim 2
Independent Claim
336 words
An apparatus for automatically compensating for changes in the effect of the earth''s magnetic field on a color television receiver having a cathode ray tube with a front panel mounted in a plane parallel to the face of the cathode ray tube comprising: first, second and third detection means for sensing the earth''s magnetic field and producing voltages in response thereto, each of said means including at least one magnetoresistance element; said first, second and third detection means being arranged such that the second and third detection means are mounted at 45* to said first means and at 90* relative to each other; said first detection means lying in a vertical plane which is normal to the face of said cathode ray tube, said second and third detection means lying in planes normal to the face of said cathode ray tube, voltage sources respectively connected to said first, second and third detection means; first, second and third means for respectively amplyfying the outputs of the first, second and third detection means; a main coil mounted about the face of the cathode ray tube adjacent to the front panel of the cathode ray tube and lying in a vertical plane parallel to said face and extending around said cathode ray tube; a first pair of coils respectively mounted at the upper and lower left-hand portions of said cathode ray tube and lying in horizontal planes; a second pair of coils at the upper and lower right-hand portions of the cathode ray tube and lying in horizontal planes, means for applying the output of the first amplifying means to said main coil: means for applying the output of the second amplifying means to the first pair of coils: means for applying the output of the third amplifying means to said second pair of coils; and first, second and third magnetic flux collector means respectively disposed adjacent to and aligned with each of the first, second and third detection means so As to enhance the sensitivity of said means.
Claim 3
Dependent Claim
105 words
An apparatus for automatically eliminating the influence of the earth''s magnetic field on color television receivers in accordance with claim 1 wherein said first, second and third detection means each include magnetoresistance elements each having a region of N-type semi-conductor material, a region of P-type semi-conductor material, and an intermediate region of semi-conductor material having less carrier concentration than either said P-type region or said N-type region between said P- and N-type regions, and said intermediate region having a discrete region of recombination centers different from the remainder of the intermediate region which are asymmetrically located with respect to the center axis of carrier flow.
Claim 4
Dependent Claim
45 words
An apparatus for automatically eliminating the influence of the earth''s magnetic field on a color television receiver in accordance with claim 1 wherein each of the first, second and third detection means consists of four magnetoresistance elements connected in the form of a bridge circuit.
Claim 5
Dependent Claim
178 words
An apparatus for automatically eliminating the influence of the earth''s magnetic field on a color television receiver in accordance with claim 1 wherein the first, second and third means detection each include a pair of magnetoresistance elements connected in series with one another each comprising a region of semi-conductor material having a P-type region, an N-type region and a substantially intrinsic semi-conductor region located at least in part between said P-type and N-type regions, said intrinsic semi-conductor region having a discrete region of recombination centers different from the remainder of the intermediate region which are asymmetrically located with respect to the center axis of the carrier flow and said pair of magnetoresistance elements positioned relative to each other such that when placed in a magnetic field directed perpendicular to the direction of current flow the current carriers in one of the elements will be deflected toward said discrete region of recombination centers to increase the resistance and the current carriers in the other element will be deflected from said descrete region of recombination centers to decrease the resistance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |