US2722621A - Device for deflecting the cathode-ray in cathode-ray tubes - Google Patents

Device for deflecting the cathode-ray in cathode-ray tubes Download PDF

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Publication number
US2722621A
US2722621A US188146A US18814650A US2722621A US 2722621 A US2722621 A US 2722621A US 188146 A US188146 A US 188146A US 18814650 A US18814650 A US 18814650A US 2722621 A US2722621 A US 2722621A
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United States
Prior art keywords
coil
cathode
conductors
tube
ray
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Expired - Lifetime
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US188146A
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English (en)
Inventor
Schenau Bernardus Willem Ingen
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • This invention relates to a deflecting coil system for cathode-ray tubes.
  • the deflecting coil system avoids the foregoing disadvantages.
  • the deflecting coil system comprises one or more rigid turns.
  • Such coils which comprise one or more rigid turns is very simple and this coil system can be readily duplicated. rigid, they need not engage one another except at one or more points which are determined by the shape of the turns so that insulating material will only be required locally. Furthermore, the coil may be made self-supporting so that a particular sleeve for supporting the turns is not required.
  • the coil may be applied directly to the wall of a cathode-ray tube, which decreases the deflection energy required.
  • Adjustment of the coils may be made during manufacture by employing a simple templet, thus simplifying the adjusting operation.
  • Figures 1 and 2 show a deflecting coil of two turns which, after being deformed into the shape shown in Figures 3 and 4, constitute a coil which is shown in front view and in rear view in Figures 5 and 6, respectively.
  • Figure 7 shows a deflection coil constituted by two halves each comprising one closed turn.
  • Figure 8 shows a coil constituted by one turn, of which Figure 9 is an exploded view in a plane, Figure 10 being an exploded view of a slightly modified form of the coil shown in Figure 8.
  • Fig. 15 is a view showing the coil of Fig. 8 in position on a cathode-ray tube.
  • Figures 1 and 2 are exploded views of the two turns Since the coil turns are 2,722,5Zi Patented Nov. 1, 1955 constituting a coil comprising two halves according to one embodiment of the invention.
  • the turns are constituted by ribbon-like pieces of U-shaped form, the two limbs 1, 2 and also the limbs 3, 4 being provided at the open ends with ring segmentlike parts 5 and 7.
  • the ring segment-like parts 5 and 7 terminate in straight parts 6 and 3, respectively, which serve as current supply conductors for the coil.
  • the extremities of the ribbonlike piece of Figure 1 are designated a and b and those of the piece of Figure 2 are designated c and d.
  • the ribbon-like pieces may be produced by a stamping operation on a sheet of suitable conductive material, such as copper, brass or aluminium.
  • suitable conductive material such as copper, brass or aluminium.
  • the thickness of such a sheet and hence of the turns may be, for example, 1.5 mm.
  • each piece is easily deformable so that the stamping can be bent into the desired shape and yet the turns thus produced have sufficient rigidity to ensure a self-supporting coil construction.
  • the shape shown in Figure 3 is obtained by bending the parts to the right of the dotted line 9-5 in Figure 1 forward and at right angles to the plane of the drawing. Subsequently, the short limb 11 of the U-shaped piece is bent substantially in the shape of a circle until the shape corresponds to the periphery of the cathode-ray tube.
  • the illustrated construction shows a coil which cooperates with a cylindrical portion of the cathode-ray tube.
  • a portion of the coil surrounds a cylindrical portion of the tube and another portion surrounds a conical portion of the tube.
  • the parts 1 and 2 which are shown as straight, are gradually bent conically towards the part 11, the part 11 being shaped to conform with the larger diameter, resulting in bent part 11 embracing the tube over a smaller number of degrees.
  • the short limb 12 is bent into the correct shape.
  • the halves of the coil are then assembled by connecting the ends b and d by welding or soldering.
  • Figure 5 shows the assembled coil surrounding a templet 13, the latter being shown only diagrammatically.
  • the cylindrical templet which has the same diameter as the cathode-ray tube for which the coil is intended, serves, as will appear hereinafter, for correcting the adjustment of the halves of the coil and of two coils, for example, the line coil and the image coil in a television apparatus.
  • the other end of the coil has the shape shown in Figure 6.
  • the coil is connecetd during operation through the ends a and c to the secondary terminals of a matching transformer, a sawtooth current flowing through the primary winding of the transformer.
  • the pair of limbs 1 and 4 which belong to different pieces, as shown in Figures 1 to 4, inclusive, is thus traversed by the current in backward direction and the pair of limbs 2, 3 is traversed in forward direction.
  • the two parts of limbs are positioned diametrically opposite one another.
  • Figure 6 furthermore, shows that the bent parts 11 and 12 overlap in part. This fact may be utilized to interconnect these parts with electrical insulation at one or more points in order to obtain a sufliciently rigid construction.
  • short parts 11 and 12 are also chosen to have different lengths, these parts will group themselves about the bent parts 11 and 12 of the other coil, which affords further possibilities of securing.
  • Figure 5 only shows the parallel limbs 16, 17, 18, 19 of the second coil, in this case, the image deflection coil.
  • the dimension of these limbs, measured along the circumference of the tube or templet 13, is smaller than that of the limbs 1, 2, 3, 4.
  • templet 13 is employed, since it is provided with a plurality of elevated ribs in the longitudinal direction.
  • ribs For the sake of clarity in the drawing, only two such ribs are indicated by 28 and 21 in Figure 5, but their number is equal to the number of limbs of the coil or the coil systern, their position and width along the circumference of the templet being chosen such that the limbs of the coil or the coil system just fit between the ribs. The position and the spacing between the limbs are thus completely fixed so that the coil need not be deformed when being mounted about the cathode-ray tube.
  • the shape of the surface scanned by the cathode-ray may be influenced by the choice of the spacing between the limbs of one pair, for example, between the limbs 2, 3 or 1, 4 in Figure 5, so that cushionor barrel-like distortion is avoided.
  • the coil according to the embodiment shown in Figure 7 comprises two closed filiform halves 22 and 23, which are arranged about the cathode-ray tube in a manner which is clear from the figure without any further explanation.
  • Each winding comprises a loop-like part 24, 25 respectively, a core 26 of a transformer being passed through-the loops formed.
  • the secondary windings of the transformer are constituted by the turns 22 and 23, the core being surrounded by the primary winding 27.
  • the coil comprises two halves and each half of the coil comprises one turn.
  • the coil or the coil system comprises only one turn.
  • the coil shown in Figure 8 comprises two closed conductors 28 and 29 surrounding the cathode-ray tube, which conductors are at right angles to the longitudinal axis of the tube as shown in Fig. 15 and are spaced a small distance apart.
  • the said conductors are connected by means of two conductors 30 and 31 extending at least in part along the tube and positioned diametrically with respect to the axis of the tube.
  • the conductor 31 does not extend entirely along the tube but comprises a loop-shaped part 32, 33, 34 for coupling with a matching transformer.
  • a turn of the shape shown in Figure 8 may be manufactured from sheet metal by punching it therefrom in a shape as shown in Figure 9. Identical parts are indicated by corresponding reference numerals.
  • the coil is formed in the required shape by bending, which, as before, may be effected with the use of a templet, whereafter the extremities 35 and 36 are welded together.
  • two coils each of the shape shown in Figure 8 may be arranged about the tube but displaced by 90.
  • said two coils may be combined while nevertheless retaining the advantage that the coil system may be stamped from sheet metal in one piece.
  • One current circuit comprises a coupling turn 38, a closed conductor 39, a limb 40, a closed conductor 41, a limb 42, and supply and discharge conductors 43 and 44.
  • the closed conductor 41 exhibits, for example, rotational symmetry, the potential difference between the points 45 and 46, which are shifted by with respect to the points 47 and 48, will be nil.
  • a second current circuit shown in dotted lines and comprising a coupling turn 49, a supply condue tor 50, a closed conductor 51, a limb 52, a limb 53 and a discharge conductor 54 may be connected to the said points 45 and 46 without this circuit being traversed by currents originating from the circuit shown in full line and, conversely, since the points 47 and 48, which are regarded as belonging to the last-mentioned circuit, do not exhibit a potential difference.
  • Figure 12 shows a construction of such a combined coil system, in which the reference numerals correspond to those of Figure 11. It affords electrical and mechanical advantages to arrange the closed conductors 39 and 51 in one plane, one conductor having an inner diameter such that it is capable of embracing the other conductor without making electric contact therewith.
  • Figure 13 shows the manner in which the coil system of Figure 12 may be stamped from sheet metal in one piece; the system shown in Figure 12 can be imagined to be interrupted at the coupling turns 38 and 49. In this case only one welding spot is required for each circuit.
  • a deflecting coil for a cathode ray tube having a given longitudinal axis comprising a first pair of axiallyspaced flat annular conductors each encircling said tube and arranged at right angles to the longitudinal axis thereof, a second pair of elongated flat conductors mounted diametrically opposite one another on opposite sides of the tube with their flat sides substantially parallel to thelongitudinal axis of the tube, the ends of one of said second pair of conductors being connected to portions of the first pair of conductors lying on the same side of the tube, the ends of the other of said second pair of conductors being connected to portions of the first pair of conductors 1ying on the opposite side of the tube, and means for coupling electrical energy to said conductors.
  • each of the second pair of conductors comprises a parallel combination of conductors spaced apart a relatively small distance.
  • a deflecting coil as claimed in claim 1 in which the coil is constituted by a ribbon-like unitary rigid conductor.
  • a deflecting coil system for a cathode-ray tube comprising two coils as claimed in claim 1 in which the two coils have a common annular conductor at one end, and the second pairs of conductors are displaced about along the periphery of the tube.
  • a deflecting coil as claimed in claim 1 in which the coil has a filliform shape.
  • a deflecting coil for a cathode ray tube having a given longitudinal axis comprising a first pair of axiallyspaced flat annular conductors each encircling said tube and arranged at right angles to the longitudinal axis thereof and a second pair of elongated flat conductors mounted diametrically opposite one another on opposite sides of the tube with their flat sides substantially parallel to the longitudinal axis of the tube, the ends of one of said second pair of conductors being connected to portions of the first pair of conductors lying on the same side of the tube, the ends of the other of said second pair of conductors being connected to portions of the first pair of conductors lying on the opposite side of the tube, one of said second pair of conductors including means for coupling electrical energy into said coil.

Landscapes

  • Details Of Television Scanning (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US188146A 1949-10-04 1950-10-03 Device for deflecting the cathode-ray in cathode-ray tubes Expired - Lifetime US2722621A (en)

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NL285960X 1949-10-04

Publications (1)

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US2722621A true US2722621A (en) 1955-11-01

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US188146A Expired - Lifetime US2722621A (en) 1949-10-04 1950-10-03 Device for deflecting the cathode-ray in cathode-ray tubes

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US (1) US2722621A (US06252093-20010626-C00008.png)
BE (1) BE498448A (US06252093-20010626-C00008.png)
CH (1) CH285960A (US06252093-20010626-C00008.png)
DE (1) DE895482C (US06252093-20010626-C00008.png)
FR (1) FR1025382A (US06252093-20010626-C00008.png)
GB (1) GB686270A (US06252093-20010626-C00008.png)
NL (2) NL73510C (US06252093-20010626-C00008.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813212A (en) * 1955-12-28 1957-11-12 Rca Corp Electromagnetic cathode ray beam deflection system
US2830212A (en) * 1954-01-15 1958-04-08 Visseaux S A J Electromagnetic deflecting means
US2831135A (en) * 1953-07-10 1958-04-15 Visseaux S A J Electromagnetic deflection means
US2831136A (en) * 1953-09-24 1958-04-15 Visseaux S A J Electromagnetic deflecting means
US2882431A (en) * 1956-11-13 1959-04-14 Park Products Company Self-convergent deflection yoke for a color tv cathode ray tube and system using the same
US2919381A (en) * 1956-07-25 1959-12-29 Farrand Optical Co Inc Electron lens
US3788721A (en) * 1970-12-15 1974-01-29 Thorn Electrical Ind Ltd Electrically conductive components

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1789129A (en) * 1927-12-08 1931-01-13 Vincent G Apple Bar winding
US1834925A (en) * 1928-10-26 1931-12-08 Vincent G Apple Method of making armature coils
US2100618A (en) * 1933-12-07 1937-11-30 Telefunken Gmbh Cathode ray apparatus
US2186595A (en) * 1935-05-23 1940-01-09 Firm Fernseh Ag Deflecting coil
US2208939A (en) * 1935-07-16 1940-07-23 Firm Fernseh Ag Magnetic deflecting system for braun tubes
US2324089A (en) * 1941-12-09 1943-07-13 Bell Telephone Labor Inc Electron discharge apparatus
US2490181A (en) * 1946-11-18 1949-12-06 Vickers Inc Alternating current machine
US2505011A (en) * 1939-08-09 1950-04-25 Int Standard Electric Corp Magnetic deflecting system for cathode-ray tubes
US2550592A (en) * 1948-08-10 1951-04-24 Emi Ltd Focusing coil for cathode-ray tubes
US2578343A (en) * 1946-06-13 1951-12-11 Bell Telephone Labor Inc Deflection coil testing apparatus and method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR747139A (fr) * 1931-11-10 1933-06-12 Appareils de déviation de courants électroniques dans les tubes à rayons cathodiques
US2227053A (en) * 1935-03-28 1940-12-31 Telefunken Gmbh Magnetic coil for deviating cathode rays

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1789129A (en) * 1927-12-08 1931-01-13 Vincent G Apple Bar winding
US1834925A (en) * 1928-10-26 1931-12-08 Vincent G Apple Method of making armature coils
US2100618A (en) * 1933-12-07 1937-11-30 Telefunken Gmbh Cathode ray apparatus
US2186595A (en) * 1935-05-23 1940-01-09 Firm Fernseh Ag Deflecting coil
US2208939A (en) * 1935-07-16 1940-07-23 Firm Fernseh Ag Magnetic deflecting system for braun tubes
US2505011A (en) * 1939-08-09 1950-04-25 Int Standard Electric Corp Magnetic deflecting system for cathode-ray tubes
US2324089A (en) * 1941-12-09 1943-07-13 Bell Telephone Labor Inc Electron discharge apparatus
US2578343A (en) * 1946-06-13 1951-12-11 Bell Telephone Labor Inc Deflection coil testing apparatus and method
US2490181A (en) * 1946-11-18 1949-12-06 Vickers Inc Alternating current machine
US2550592A (en) * 1948-08-10 1951-04-24 Emi Ltd Focusing coil for cathode-ray tubes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831135A (en) * 1953-07-10 1958-04-15 Visseaux S A J Electromagnetic deflection means
US2831136A (en) * 1953-09-24 1958-04-15 Visseaux S A J Electromagnetic deflecting means
US2830212A (en) * 1954-01-15 1958-04-08 Visseaux S A J Electromagnetic deflecting means
US2813212A (en) * 1955-12-28 1957-11-12 Rca Corp Electromagnetic cathode ray beam deflection system
US2919381A (en) * 1956-07-25 1959-12-29 Farrand Optical Co Inc Electron lens
US2882431A (en) * 1956-11-13 1959-04-14 Park Products Company Self-convergent deflection yoke for a color tv cathode ray tube and system using the same
US3788721A (en) * 1970-12-15 1974-01-29 Thorn Electrical Ind Ltd Electrically conductive components

Also Published As

Publication number Publication date
NL73510C (US06252093-20010626-C00008.png)
GB686270A (en) 1953-01-21
FR1025382A (fr) 1953-04-14
CH285960A (de) 1952-09-30
DE895482C (de) 1953-11-02
NL149134B (nl)
BE498448A (US06252093-20010626-C00008.png)

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