US4057747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-line plural beam color cathode ray tube having deflection defocus correcting elements
Assignee: Toshiba Corp
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Filing: 1975-10-14
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Granted: 1977-11-08
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Expires: 1995-10-14
Abstract
Abstract In a color cathode ray tube including an electron gun means for projecting three electron beams in an in-line arrangement, there is provided deflection defocus correcting means which are disposed adjacent the side electron beams for neutralizing the deflection defocus of the side beam caused by the non-uniformity of the deflection fields.
Inventors
- 👤 Eizaburo Hamano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:45
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/707; H01J29/48; H01J29/51; H01J2229/00; H01J2229/58; H01J2229/581; H01J2229/583; H01J2229/5835
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
A color cathode ray tube comprising: an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section; a phosphor screen formed on the inner surface of the face plate; a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through horizontal and vertical deflection fields produced by a deflection yoke; and deflection defocus correcting means comprising a pair of similarly shaped elements having high magnetic permeability and symmetrically located above and below the plane of the beam arrangement and disposed adjacent to the side beams and biassed substantially inwardly from the center of the beam bundle of said side beams so as to couple the deflection fields and to introduce asymmetrical forces to said side beams for correcting the beam distortion caused by the non-uniformity of said deflection fields.
Claim 2
Dependent Claim
160 words
A color cathode ray tube comprising: an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section; a phosphor screen formed on the inner surface of the face plate; a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through horizontal and vertical deflection fields produced by a deflection yoke; and deflection defocus correcting means comprising a pair of similarly shaped elements having high magnetic permeability and symmetrically located above and below the plane of the beam arrangement and disposed adjacent to the side beams and biassed substantially inwardly from the center of the beam bundle of said side beams so as to couple the deflection fields and to introduce asymmetrical forces to said side beams for correcting the beam distortion caused by the non-uniformity of said deflection fields.
Claim 3
Dependent Claim
48 words
A color cathode ray tube as in claim 1 wherein the electron gun means has an outlet end for projecting the electron beams, the deflection defocus correcting elements being disposed adjacent to the electron beam outlet of the electron gun means and between the path of the beams.
Claim 4
Dependent Claim
43 words
A color cathode ray tube as in claim 1 wherein the deflection defocus correcting elements comprise a thin plate having a width along the path of the electron beam and a height in the plane perpendicular to the plane of the beam arrangement.
Claim 5
Dependent Claim
22 words
A color cathode ray tube as in claim 1 wherein the deflection defocus correcting elements are disposed equidistant from the center beam.
Claim 6
Dependent Claim
142 words
A color cathode ray tube comprising: a phosphor screen; a shadow mask having a multiplicity of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a plurality of electron beams in an in-line arrangement toward the screen through deflection fields produced by a deflection yoke; raster control means comprising at least a pair of control members disposed adjacent the path of the electron beams and in the region of the deflection field between the electron gun means and the deflection yoke; deflection defocus correcting means comprising a pair of elements of high magnetic permeability symmetrically located above and below the plane of the beam arrangement and disposed adjacent the path of the side beams in an in-line arrangement to impart assymetrical forces to said side beams to neutralize the beam distortion caused by the non-uniformity of the deflection fields.
Claim 7
Dependent Claim
142 words
A color cathode ray tube comprising: a phosphor screen; a shadow mask having a multiplicity of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a plurality of electron beams in an in-line arrangement toward the screen through deflection fields produced by a deflection yoke; raster control means comprising at least a pair of control members disposed adjacent the path of the electron beams and in the region of the deflection field between the electron gun means and the deflection yoke; deflection defocus correcting means comprising a pair of elements of high magnetic permeability symmetrically located above and below the plane of the beam arrangement and disposed adjacent the path of the side beams in an in-line arrangement to impart assymetrical forces to said side beams to neutralize the beam distortion caused by the non-uniformity of the deflection fields.
Claim 8
Dependent Claim
72 words
A color cathode ray tube as in claim 5 wherein the raster control means comprises a first control member comprising a pair of similarly shaped elements disposed about respective side beams and a second control member comprising a pair of similarly shaped elements symmetrically located equidistantly above and below the path of the center beam, the deflection defocus correcting elements being disposed adjacent the first control member of the raster control means.
Claim 9
Dependent Claim
53 words
A color cathode ray tube as in claim 6 wherein the second control member of the raster control means comprises a pair of generally V-shaped elements having apices which face each other and the deflection defocus correcting means for the side beams comprises two pair of thin plates disposed between respective side beams.
Claim 10
Dependent Claim
43 words
A color cathode ray tube as in claim 6 wherein the second control member of the raster control means and the deflection defocus correcting elements are mounted on the same support members symmetrically located above and below the plane of the beam arrangement.
Claim 11
Dependent Claim
37 words
A color cathode ray tube as in claim 6 wherein the first control member of the raster control means is generally circular shaped and the deflection defocus correcting elements are aligned with the circular shaped control member.
Claim 12
Dependent Claim
36 words
A color cathode ray tube as in claim 6 wherein the second control member of the raster control means is generally V-shaped and the deflection defocus correcting elements are disposed behind the V-shaped second control member.
Claim 13
Dependent Claim
122 words
A color cathode ray tube comprising: an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section; a phosphor screen formed on the inner surface of the face plate; a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through a pin-cushion shaped horizontal deflection field produced by a deflection yoke; and high magnetic permeability deflection defocus correcting means disposed adjacent the paths of the side beams to impart asymmetrical forces to the side beams to compensate for the beam distortion caused by the non-uniformity of the pin-cushion shaped deflection field.
Claim 14
Dependent Claim
122 words
A color cathode ray tube comprising: an evacuated envelope including a face plate, a neck portion and an interconnecting funnel section; a phosphor screen formed on the inner surface of the face plate; a shadow mask including a plurality of apertures disposed adjacent to the phosphor screen; electron gun means for projecting a central electron beam and a pair of side beams in an in-line arrangement directed toward the screen through a pin-cushion shaped horizontal deflection field produced by a deflection yoke; and high magnetic permeability deflection defocus correcting means disposed adjacent the paths of the side beams to impart asymmetrical forces to the side beams to compensate for the beam distortion caused by the non-uniformity of the pin-cushion shaped deflection field.
Claim 15
Dependent Claim
23 words
A color cathode ray tube as in claim 1 wherein the deflection defocus correcting means comprises two pair of generally triangular shaped elements.
Claim 16
Dependent Claim
22 words
A color cathode ray tube as in claim 1 wherein the defocus correcting means comprises two pair of generally circular shaped elements.
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |