US3887833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color purity adjusting device for a color picture tube
Assignee: Hitachi Ltd
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Filing: 1970-05-27
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Granted: 1975-06-03
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Expires: 1990-05-27
Abstract
Abstract A color purity adjusting device for a color picture tube, provided with one or more types of correcting coils which are wound on the outer periphery of the color picture tube in order to correct any mislanding of an electron beam due to deformation which might take place during the manufacturing process of the color picture tube, such as, a distortion of a shadow mask or of a glass bulb and to correct any mislanding of the same due to the influence of same external magnetic field such as the earth''s magnetism, thereby to obtain a picture of improved color purity.
Inventors
- 👤 Eiichi Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/003; H01J2229/00; H01J2229/0007; H01J2229/003; H01J2229/0046; H01J2229/0053; H01J2229/56; H01J2229/563; H01J2229/5637
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A color purity adjusting device for a color picture tube having a phosphor screen, comprising a first coil formed of component magnetic coils connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic coils being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube.
Claim 2
Dependent Claim
76 words
A color purity adjusting device for a color picture tube having a phosphor screen, comprising a first coil formed of component magnetic coils connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic coils being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube.
Claim 3
Dependent Claim
76 words
A color purity adjusting device for a color picture tube having a phosphor screen, comprising a first coil formed of component magnetic coils connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic coils being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube.
Claim 4
Dependent Claim
76 words
A color purity adjusting device for a color picture tube having a phosphor screen, comprising a first coil formed of component magnetic coils connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic coils being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube.
Claim 5
Dependent Claim
56 words
A color purity adjusting device for a color picture tube according to claim 1, further comprising a second coil which is disposed on the neck portion of said color picture tube and which produces a magnetic field for correction of magnetic field effects in a horizontal direction perpendicular to the axis of said color picture tube.
Claim 6
Dependent Claim
97 words
A color purity adjusting device for a color picture tube, comprising a first coil formed of component magnetic elements connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic elements being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube, and a second coil which is constituted by winding a conductive wire on the outer periphery of said color picture tube adjacent said first coil.
Claim 7
Dependent Claim
97 words
A color purity adjusting device for a color picture tube, comprising a first coil formed of component magnetic elements connected to form magnetic poles in the vicinity of the four corners of the phosphor screen of said color picture tube to provide a quadripole magnetic pole arrangement, each of said component magnetic elements being disposed to produce a magnetic field in a plane perpendicular to the axis of said color picture tube, and a second coil which is constituted by winding a conductive wire on the outer periphery of said color picture tube adjacent said first coil.
Claim 8
Dependent Claim
56 words
A color purity adjusting device for a color picture tube according to claim 3, further comprising a third coil which is disposed on the neck portion of said color picture tube and which producEs a magnetic field for correction of magnetic field effects in a horizontal direction perpendicular to the axis of said color picture tube.
Claim 9
Dependent Claim
51 words
A color purity adjusting device for a color picture tube according to claim 4, further comprising a potentiometer connected to said second and said third coils, and a single knob joined to sliding terminals of said potentiometer for adjustment of currents caused to flow through said second and said third coils.
Claim 10
Dependent Claim
102 words
A color purity adjusting device for a color picture tube, comprising a first coil which is disposed on the neck portion of said color picture tube and which produces a magnetic field for compensation of magnetic field effects in a direction perpendicular to the axis of said color picture tube, and a second coil which is constituted by winding a conductive wire on the outer periphery of said color picture tube substantially in the plane of the phosphor screen and which produces a magnetic field for compensation of magnetic field effects along the direction of the axis of said color picture tube.
Claim 11
Dependent Claim
102 words
A color purity adjusting device for a color picture tube, comprising a first coil which is disposed on the neck portion of said color picture tube and which produces a magnetic field for compensation of magnetic field effects in a direction perpendicular to the axis of said color picture tube, and a second coil which is constituted by winding a conductive wire on the outer periphery of said color picture tube substantially in the plane of the phosphor screen and which produces a magnetic field for compensation of magnetic field effects along the direction of the axis of said color picture tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |