US3774070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection coil system, in particular for a camera tube
Assignee: US Philips Corp
•
Filing: 1972-05-22
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Granted: 1973-11-20
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Expires: 1992-05-22
Abstract
Abstract A deflection coil system, in particular for a camera tube, consisting of two pairs of coaxial cylindrical coils. Each coil consists of a helical conductor with turn planes which are arranged at an angle. The normals of the turn planes are arranged in a half-plane on one side of the cylinder axis in each coil. The four half-planes together form two mutually perpendicular planes.
Inventors
- 👤 L Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:59
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76; H01J29/465; H01J2229/00; H01J2229/96; H01J2229/964
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A deflection coil system for deflecting a beam of charged particles, in particular a beam of electrons in a camera tube, comprising a first pair of coils for deflecting the beam in a first direction which is perpendicular to the direction of movement of the particles, and a second pair of coils for deflecting the beam in a second direction which is perpendicular to the direction of movement and perpendicular to the first direction, characterized in that at least one of the said coil pairs is composed of two coaxial cylindrical coils (45,47), eAch of which consists of a conductor (29) which is helically wound such that the central normal (43 and 44, respectively) of each turn plane (39 and 40, respectively) encloses an acute angle with the cylinder axis (33), all central normals (43) of one coil (45) being arranged in one plane and on one side of the cylinder axis 33, the central normals (44) of the second coil (47) being arranged in the same plane and on the other side of the cylinder axis (33).
Claim 2
Dependent Claim
178 words
A deflection coil system for deflecting a beam of charged particles, in particular a beam of electrons in a camera tube, comprising a first pair of coils for deflecting the beam in a first direction which is perpendicular to the direction of movement of the particles, and a second pair of coils for deflecting the beam in a second direction which is perpendicular to the direction of movement and perpendicular to the first direction, characterized in that at least one of the said coil pairs is composed of two coaxial cylindrical coils (45,47), eAch of which consists of a conductor (29) which is helically wound such that the central normal (43 and 44, respectively) of each turn plane (39 and 40, respectively) encloses an acute angle with the cylinder axis (33), all central normals (43) of one coil (45) being arranged in one plane and on one side of the cylinder axis 33, the central normals (44) of the second coil (47) being arranged in the same plane and on the other side of the cylinder axis (33).
Claim 3
Dependent Claim
33 words
A deflection coil system as claimed in claim 1, characterized in that the angle between the central normals (43, 44) and the cylinder axis (33) is larger than 3* and smaller than 20*.
Claim 4
Dependent Claim
80 words
A deflection coil system as claimed in claim 1, characterized in that the configuration of the second coil pair (67, 69) is the same as that of the first coil pair (45, 47), the axes (33) of the two coil pairs (45, 47 and 67, 69) coinciding, the plane of the central normals (71, 72) of the second coil pair (67, 69) being perpendicular to the plane of the central normals (43, 44) of the first coil pair (45, 47).
Claim 5
Dependent Claim
27 words
A deflection coil system as claimed in claim 3, characterized in that the first coil pair (45, 47) is arranged inside the second coil pair (67, 69).
Claim 6
Dependent Claim
49 words
A deflection coil system as claimed in claim 3 and intended for a camera tube comprising an electron gun and a target, characterized in that the length of the deflection coil system (27) is at least equal to the distance between the electron gun (3) and the target (13).
Claim 7
Dependent Claim
47 words
A television camera provided with a deflection coil system as claimed in claim 4, characterized in that the inner coil pair (45, 47) is connected to a generator for image-frequency deflection currents, the outer coil pair (67, 69) being connected to a generator for line-frequency deflection currents.
Claim 8
Dependent Claim
52 words
A television camera as claimed in claim 6, characterized in that the four coils (45, 47, 67, 69) are also connected to a circuit for generating a direct current which is capable of generating a magnetic field in the deflection coil system which serves for the focussing of the electron beam (5).
Claim 9
Independent Claim
94 words
An apparatus for deflecting and focusing a beam of charged particles moving in a given direction in a direction perpendicular thereof comprising first and second helical coaxial coils each having a cylinder axis substantially parallel to said given direction, the central normals of the turn planes thereby formed being at a first acute angle with respect to said given direction, said first coil central normals being on one side of said axis in a given plane, and said second coil central normals being on the other side of said axis in said given plane.
Claim 10
Independent Claim
94 words
An apparatus for deflecting and focusing a beam of charged particles moving in a given direction in a direction perpendicular thereof comprising first and second helical coaxial coils each having a cylinder axis substantially parallel to said given direction, the central normals of the turn planes thereby formed being at a first acute angle with respect to said given direction, said first coil central normals being on one side of said axis in a given plane, and said second coil central normals being on the other side of said axis in said given plane.
Claim 11
Dependent Claim
18 words
An apparatus as claimed in claim 8 wherein said angle is greater than 3* and less than 20*.
Claim 12
Dependent Claim
57 words
An apparatus as claimed in claim 8 further comprising third and fourth helical coaxial coils each having a cylinder axis substantially parallel to said given direction, the central normals of the turn planes thereby formed being at a second acute angle with respect to said given direction and perpendicular to said first and second coils central normals.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |