Patent US3902145A successfully refreshed from Google Patents.
US3902145A
Expired / Lapsed
US
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Magnetic correction device for a cathode ray tube
Assignee: US Philips Corp
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Filing: 1974-04-03
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Granted: 1975-08-26
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Expires: 1994-04-03
Abstract
Abstract Magnetic correction device for a cathode ray tube, which device comprises a plurality of ring pairs which are secured to supports and each consist of rings which have magnetic poles distributed about their peripheries. The two rings of each pair are concentrically mounted and preferably are interconnected by a pinion so as to be rotatable in opposite senses.
Inventors
- 👤 Antonie Slavenburg
- 👤 Den Boogert Johannes Van
- 👤 Antoon Swart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:15
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/703
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
168 words
Magnetic correction device for influencing the paths of electron beams produced in a cathode ray tube, which device comprises at least one support made of a non-magnetic material, securing means for securing the support to the neck of a cathode ray tube, and at least one pair of coaxial rings having magnetic poles distributed about their peripheries, which rings are mounted on the support and are rotatable about their axes in opposite relative directions, characterized in that one of the two rings of a pair has an inner diameter which is greater than the outer diameter of the other ring, the smaller ring being mounted within the larger ring, whilst the outer ring has teeth on its inner periphery and the inner ring has teeth on its outer periphery, at least one pinion, which is rotatable about a spindle secured to the support and extending parallel to the axis of the ring pair, being located in the space between the two rings and meshing with the said teeth.
Claim 2
Dependent Claim
168 words
Magnetic correction device for influencing the paths of electron beams produced in a cathode ray tube, which device comprises at least one support made of a non-magnetic material, securing means for securing the support to the neck of a cathode ray tube, and at least one pair of coaxial rings having magnetic poles distributed about their peripheries, which rings are mounted on the support and are rotatable about their axes in opposite relative directions, characterized in that one of the two rings of a pair has an inner diameter which is greater than the outer diameter of the other ring, the smaller ring being mounted within the larger ring, whilst the outer ring has teeth on its inner periphery and the inner ring has teeth on its outer periphery, at least one pinion, which is rotatable about a spindle secured to the support and extending parallel to the axis of the ring pair, being located in the space between the two rings and meshing with the said teeth.
Claim 3
Dependent Claim
20 words
Correction device as claimed in claim 1, characterized in that the teeth on the two rings are equal in number.
Claim 4
Dependent Claim
23 words
Correction device as claimed in claim 1, characterized in that the outer ring is provided with at least one radially externally projecting lug.
Claim 5
Dependent Claim
26 words
Correction device as claimed in claim 3, characterized in that the support also is provided with at least one radial lug which projects to the exterior.
Claim 6
Dependent Claim
29 words
Correction device as claimed in claim 3, characterized in that the lugs are radially extensible by means of an extension adapted to be slipped on one of the lugs.
Claim 7
Dependent Claim
61 words
Correction device as claimed in claim 1, characterized in that the securing means for securing the support to the neck of a cathode ray tube comprise an intermediate ring which is adapted to be coaxially placed around the tube neck and to which at least one support is secured so as to be rotatable about the intermediate ring as a spindle.
Claim 8
Dependent Claim
60 words
Correction device as claimed in claim 6, characterized in that two supports are provided which are spacedly and axially rotatably secured to the intermediate ring, each of the rings carried by the first support having four magnetic poles distributed about its periphery, whilst each of the rings carried by the second support has six magnetic poles distributed about its periphery.
Claim 9
Dependent Claim
53 words
Correction device as claimed in claim 7, characterized in that between the two supports which are rotatably secured to the intermediate ring a third support is secured to the intermediate ring so as to be locked against rotation, each of the rings carried by the third support having two diametrically arranged magnetic poles.
Claim 10
Dependent Claim
30 words
Correction device as claimed in claim 6, characterized in that means are provided for locking each support against rotation about the intermediate ring after the desired correction has been effected.
Claim 11
Dependent Claim
41 words
Correction device as claimed in claim 9, characterized in that the locking means comprise knurled areas which are provided on each rotatable supports (47) and are capable of engaging a knurled area which is not rotatable relative to the intermediate ring.
Claim 12
Dependent Claim
48 words
Correction device as claimed in claim 10, characterized in that the knurled areas are located on the major surfaces of each support and the non-rotatable knurled area is located on the middle, non-rotatable support, thrust means being provided for exerting an axial force on the set of supports.
Claim 13
Dependent Claim
107 words
Correction device as claimed in claim 11, characterized in that the thrust means comprise a thrust ring which is secured to the intermediate ring and is rotatable about the intermediate ring as a spindle and the thickness of which varies in the peripheral direction at least near the inner periphery, the portion of varying thickness being located between at least one radial projection formed on the intermediate ring and one of the supports, the arrangement being such that the spacing between the projection and the said support is greater than the smallest thickness and smaller than the greatest thickness of the said portion of the thrust ring.
Claim 14
Dependent Claim
29 words
Correction device as claimed in claim 6, characterized in that a conical clamping ring is provided to secure the intermediate ring to the neck of a cathode ray tube.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |