US3624573A - Blue lateral magnet structure - Google Patents

Blue lateral magnet structure Download PDF

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Publication number
US3624573A
US3624573A US37574A US3624573DA US3624573A US 3624573 A US3624573 A US 3624573A US 37574 A US37574 A US 37574A US 3624573D A US3624573D A US 3624573DA US 3624573 A US3624573 A US 3624573A
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United States
Prior art keywords
rings
pair
posts
opposite
support
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Expired - Lifetime
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US37574A
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English (en)
Inventor
Paul Ernest Wiseman
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RCA Licensing Corp
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RCA Corp
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Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/703—Static convergence systems

Definitions

  • Magnet rings have peripheral tabs, and are oriented on a mount with the tabs positioned between the locations ofa pair of posts projecting from mount surface.
  • Drive cord secured to each tab, is looped about the projecting posts. When either ring is rotated, drive cord causes other ring to undergo equaland-opposite rotation.
  • This invention relates generally to beam controlling device, and, particularly, to devices suitable for providing so-called blue lateral" correction effects to aid in the converging of the multiple beams of a multigun color image reproducing device.
  • each magnet being subject to manual adjustment to vary the position of the associated beam in a radial direction with respect to the kinescope axis.
  • the guns of the conventional trigun, shadow-mask color kinescope are disposed in a triangular configuration within the kinescope neck; the triangle is conventionally oriented in such a manner that the blue phosphor exciting gun is positioned along a radius which extends from the axis vertically (in terms of the normal display position of the phosphor screen). With such a positioning of the blue gun, adjustment of the blue beam position along a radius from the tube axis corresponds to adjustment of the blue beam in a vertical direction.
  • the present invention is directed to a compact, readily fabricated blue lateral structure of the aforementioned sixpole magnet ring type employing a simple but reliable arrangement for ensuring that rotation of either ring is accompanied by an equal-and-opposite rotation of the other ring (to preclude relative positioning of the rings in a manner introducing a vertical component of beam motion).
  • a parallel pair of projecting posts integral with the mount supporting the rotatable rings.
  • the rings have peripheral tabs, and are oriented on the mount with the tabs positioned between the projecting posts.
  • a drive cord, looped around the posts is secured to each tab, whereby rotation of either ring causes, via travel of the drive cord, an equaland-opposite rotation of the other ring.
  • the correct entrained motion of the respective magnets is thus automatically obtained with a simple, inexpensive arrangement, involving only one moving part (the drive cord) in addition to the magnets themselves.
  • An object of the present invention accordingly, is to provide a compact blue lateral magnet structure with a simple but reliable arrangement for automatically correlating the motions of a plurality of magnets.
  • FIG. 1 illustrates an end view of blue lateral magnet structure in accordance with an embodiment of the present invention
  • FIG. 2 illustrates a side view (partially broken away) of the structure of FIG. 1;
  • FIG. 3 illustrates another end view of the structure of FIG. I, with the magnets rotated to one extreme of adjustment (as contrasted with a reference position of the magnets in FIG. 1).
  • FIGS. 1 and 2 a pair of magnet rings and are shown mounted for rotation on a support structure 30.
  • Each magnet ring is provided with a peripheral tab projecting outwardly and bent at an angle relative to the flat surface of the rings.
  • Tab 11 of ring 10 is pierced by a keyholeshaped notch 12, while tab 21 is pierced by a circular aperture 22.
  • the support structure 30 includes a plurality of rearwardly extending (in the FIG. 1 view), arcuate fingers 33 defining an inner aperture of cylindrical configuration, dimensioned to snugly receive the neck 60 of a color kinescope (shown partially in phantom, broken away in FIG. 2).
  • the support structure also includes a plurality of forwardly extending (in the FIG. 1 view), arcuate fingers 34 having outer surfaces defining a cylindrical surface dimensioned to receive, for rotation thereon, the magnet rings.
  • the ring-receiving surface is eccentrically disposed with respect to the neck-receiving aperture, the axis of the fonner being shifted away from the axis of the latter (in a downwardly direction, in the FIG. 1 view).
  • a pair of posts 31, 32 Projecting from the support structure (upwardly) in a direction opposite to said axis shift are a pair of posts 31, 32, each having a rounded groove (31G and 326, respectively) near the end thereof.
  • a drive cord 40 is looped around the posts 31 and 32 and retained in the respective grooves.
  • the drive cord 40 is secured to the tabs 11 and 21 of the magnet rings (for example, by looping around the bifurcations of the notched tab 11, and by knotting free ends of the cord after insertion through aperture 22 of tab 21).
  • Retaining clips 51, 52 lightly hold the mounted rings 10, 20 to the support 30, permitting manual ring rotation while retaining the rings on the surface of fingers 34 in an adjustment position.
  • Support structure 30 may additionally conveniently serve as a mount for rotational support of color purity adjustment rings on a cylindrical surface 83 (concentric with the neckreceiving aperture) to the rear of posts 31, 32.
  • An additional pair of retaining clips 82, 81 perform a similar holding function for the purity rings.
  • a split ring clamp 70 encircling the rear fingers 33 may be tightened by means of a threaded bolt 71 and nut (not shown) to fix the position of the support structure 30 on the kinescope neck 60.
  • each ring 10 and 20 in FIG. 1 desirably is the reference position for which zero lateral shift is produced.
  • each ring is provided with an indexing notch (13, 23) positioned 30 away from the tab axis, and each tab is bent such that the notch is to the left when viewing the ring with the tab projecting toward the viewer.
  • Each ring is then magnetized with a pole of the same polarity (illustratively, north) aligned with the notch, and with additional poles of alternating polarity disposed at 60 intervals around the ring circumference.
  • FIG. 1 adjustment position places the north pole at notch 13 of ring 10 in alignment with a south pole of ring 20, the north pole at notch 23 of ring 20 in alignment with a south pole of ring 10, etc., with the result of no stray field in the neck aperture.
  • FIG. 3 illustrates the result of rotating tab 21 clockwise rela tive to its FIG. 1 position over a 30 arc. This rotation, by virtue of movement of the drive cord 40, has caused counterclockwise rotation of tab 11.
  • FIG. 3 position like poles of both rings are aligned, with the poling such that south poles are aligned at the 12 oclock position, with resultant maximum shift of the beams in the sense illustrated by the arrows R, B
  • a blue lateral magnet structure for use with a color kinescope comprising, in combination:
  • a support receiving said magnet rings in eccentric disposition with respect to a kinescope neck-receiving aperture extending through said support, and permitting adjacent rotation of said rings about an axis shifted from the axis of said aperture;
  • means including a drive cord forming a single-turn loop around said posts and secured at points on opposite loop sides to the respective rings, for entraining the motion of said rings in such manner as to ensure equal-and-opposite rotations of said rings when their rotational positions are adjusted.
  • a color kinescope having a neck portion through which a trio of electron beam paths extend, disposed in a triangular configuration about the axis of said neck;
  • a support structure having an aperture through which said neck portion extends, said rings being mounted on said support for eccentric rotation about an axis shifted from the axis of said neck in a direction diametrically away from the off-axis position of one of said beam paths;
  • said means comprising a drive cord loop established around portions of said support structure, each of said rings being secured to said cord at opposite sides of said loop by a respective securing facility located on the ring periphery substantially midway between a pair of adjacent poles.
  • a beam position correcting device comprising, in combination:
  • a pair of magnet rings each having six poles disposed symmetrically with alternating polarity about the ring circumference and each having an outwardly projecting tab positioned substantially midway between a pair of adjacent poles;
  • a support for said rings having integral therewith a pair of parallel posts extending in the same direction from separated locations on said support;
  • means including a drive cord forming a single-turn loop around said posts and secured at points on opposite loop sides to the respective rings, for entraining the motion of said rings in such manner as to ensure equal-and-opposite rotational movements of said rings on said support when either ring is rotated;
  • the separation between said post locations being dimensioned to permit substantially 60 arcuate motion of each ring.
  • each of said rings includes a drive cord securing facility positioned on its periphery at a location symmetrically intermediate a pair of adjacent ones of said poles, said drive cord being secured to said securing facilities 6.
  • said rings are received by said support with such relative axial orientation that rotational alignment of said drive cord securing facilities results in the rotational alignment of each pole of one of said rings with a respective pole of the other of said rings of opposite polarity.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US37574A 1970-05-15 1970-05-15 Blue lateral magnet structure Expired - Lifetime US3624573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3757470A 1970-05-15 1970-05-15

Publications (1)

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US3624573A true US3624573A (en) 1971-11-30

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US37574A Expired - Lifetime US3624573A (en) 1970-05-15 1970-05-15 Blue lateral magnet structure

Country Status (7)

Country Link
US (1) US3624573A (cs)
JP (1) JPS5132410B1 (cs)
BE (1) BE767108A (cs)
CA (1) CA927900A (cs)
FR (1) FR2090062B1 (cs)
GB (1) GB1353189A (cs)
NL (1) NL7106672A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389225A1 (fr) * 1977-04-25 1978-11-24 Rca Corp Dispositif de convergence statique comportant un correcteur magnetique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477985A (en) * 1948-01-21 1949-08-02 Gen Electric Multiple tuning system
US2884788A (en) * 1957-09-17 1959-05-05 Leeds & Northrup Co Cable transmission systems for recorders
US2954494A (en) * 1958-04-25 1960-09-27 Zenith Radio Corp Cathode-ray beam correction structure
NL6604197A (cs) * 1965-05-19 1966-11-21
US3305744A (en) * 1965-03-15 1967-02-21 Rca Corp Ganged ring magnets for coordinated control of a plurality of beams

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS436502Y1 (cs) * 1964-06-23 1968-03-23

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477985A (en) * 1948-01-21 1949-08-02 Gen Electric Multiple tuning system
US2884788A (en) * 1957-09-17 1959-05-05 Leeds & Northrup Co Cable transmission systems for recorders
US2954494A (en) * 1958-04-25 1960-09-27 Zenith Radio Corp Cathode-ray beam correction structure
US3305744A (en) * 1965-03-15 1967-02-21 Rca Corp Ganged ring magnets for coordinated control of a plurality of beams
NL6604197A (cs) * 1965-05-19 1966-11-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389225A1 (fr) * 1977-04-25 1978-11-24 Rca Corp Dispositif de convergence statique comportant un correcteur magnetique

Also Published As

Publication number Publication date
DE2123839B2 (de) 1972-07-20
FR2090062A1 (cs) 1972-01-14
GB1353189A (en) 1974-05-15
JPS5132410B1 (cs) 1976-09-13
DE2123839A1 (de) 1971-11-25
NL7106672A (cs) 1971-11-17
CA927900A (en) 1973-06-05
FR2090062B1 (cs) 1974-06-21
BE767108A (fr) 1971-10-01

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AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208