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US2167379A - Cathode ray tube deflecting device - Google Patents

Cathode ray tube deflecting device Download PDF

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Publication number
US2167379A
US2167379A US66171A US6617136A US2167379A US 2167379 A US2167379 A US 2167379A US 66171 A US66171 A US 66171A US 6617136 A US6617136 A US 6617136A US 2167379 A US2167379 A US 2167379A
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US
United States
Prior art keywords
windings
deflecting
winding
coils
cathode ray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US66171A
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English (en)
Inventor
William A Tolson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to IT349671D priority Critical patent/IT349671A/it
Application filed by RCA Corp filed Critical RCA Corp
Priority to US66171A priority patent/US2167379A/en
Priority to FR816431D priority patent/FR816431A/fr
Priority to GB6053/37A priority patent/GB495016A/en
Application granted granted Critical
Publication of US2167379A publication Critical patent/US2167379A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01J29/762—Deflecting by magnetic fields only using saddle coils or printed windings

Definitions

  • the deflecting device is to be employed in television receivers, it is important that the production cost be low.
  • an object of my invention to provide improved deflecting coils for a cathode ray tube.
  • FIG. 2 is a view taken along the line 2-2 of 8- I Fig. 3 is a view which is referred to in explaining how a deflecting winding is manufactured;
  • Fig. 4 is a perspective view of the vertical defleeting coils used in the deflecting device shown in Figs; 1 and 2;
  • Fig. 5 is a perspective view of the completely assembled deflecting device.
  • Fig. 6 is a diagram which is referred to in explaining my invention.
  • the deflecting device includes two diametrically opposed vertical deflecting windings I and 2, each of which is constructed as shown in Fig. 4.
  • Each winding consists of a plurality of concentrically wound coils, there being eight coils for each vertical winding, each coil preferably consisting of several turns. All the coils are wound in the same direction and connected in series.
  • the two d flecting windings I and 2 may be connected in series or in parallel, as preferred, and in such direction that their fields are aiding in accords ance with usual practice. These connections are the same as those of the deflecting windings described in the above-mentioned Tolson and Maloff patent. It will be noted that the winding does not occupy all the available space, but instead, there is a space in the center of the winding in which several coils that could have been added have been omitted.
  • the inner coil is first wound around a form which may consist of four pegs inserted in holes in a board. The next coils are then wound around similar forms, each form being of increasingly greater dimensions. As previously stated, all coils are wound in the same direction. At this point in the winding manufacture, the winding is flat, as indicated,
  • the impregnated flat winding is next placed between curved blocks (not shown) and bent into the form indicated by the end view 0 (Fig. 3) to produce the finished preformed winding.
  • the coils may be taped instead of impregnated to hold the turns in place.
  • the deflecting device includes three concentrically positioned cylindrical tubes 4, 6 and I, the two inner tubes 4 and 6 being of insulating material such as flbre, andthe outer tube or sleeve 1 being of magnetic material.
  • the'sleeve I is a seamless steel tube.
  • the outer flbre tube 6 has two rectangular spacer rods 8 and 9 of insulating material mounted thereon in diametrically opposed relation. One end oi. the rod 8 extends slightly beyond the tube 6 for centering purposes, as will be explained hereinafter. In Fig. 2 the spacer rod 9 has been omitted in order to show the winding 2.
  • the preformed vertical deflecting windings I and 2 are supported by the flbre tubeB and are located between this tube and the magnetic sleeve I. Proper spacing of the deflecting windings is maintained. by the spacer rods 8 and 9.
  • the inner surface of the sleeve I is preferably covered with a sheet of insulating material ll.
  • the inner fibre tube 4 also supports two concentrically wound distributed windings l2 and i3 which preferably are manufactured in the same way as above described. Rectangular spacing rods 14 and I6 oi! insulating material are attached to the fibre tube 4 in diametrically opposed relation for keeping the horizontal deflecting windings l2 and i3 properly spaced.
  • an electrostatic shield consisting of a sheet of conducting material, such as copper, may be placed between the vertical windings and the horizontal windings as indicated at H. In this way, undesired electrostatic coupling between the two sets of windings may be avoided. In certain-applications of the invention it has been found that the electrostatic coupling is so small that the electrostatic shield may be omitted.
  • Fibre washers l8 and I! at each end of the device protect the deflecting windings as shown in Figs. 2 and 5.
  • the washer l8 supports the horizontal deflecting winding terminals 2
  • This washer also has an opening 23 and two notches 24 therein which are utilized to center the two sets of deflecting windings.
  • the previously mentioned projecting end of the spacer rod 8 extends through the opening 23 tom: the vertical deflecting windings in position with respect to the washer l8.
  • the projecting ends of the spacer rods I4 and I6 extend through the notches 24 to fix the horizontal deflecting windings in position with respect to the washer l8 and at right angles to the vertical deflecting windings.
  • the fibre washer is held in position by means of lugs 26 extending from Y the magnetic sleeve I, these lugs. being bent over after the several component parts have been assembled.
  • my deflecting device has other important advantages over other deflecting devices, one of' these other advantages being that it reduces deshown in Fig. 6, the several figures indicate the relative strength or this magnetic fleld at the several points where the figures are located.
  • This particular fleldpattern was obtained with distributed horizontal windings similar to the ones illustrated, but having the inner coil omitted. In other words, it is the field pattern for a pair of horizontal deflecting windings,.each winding con.- sisting of five coils. The two inner coils had fourteen turns each and the three outer coils had twenty turns each.
  • Figs. 1 and 2 The specific unit illustrated in Figs. 1 and 2 provides a deflecting fleld which is uniform enough for present television receivers.
  • all coils of the horizontal deflecting windings have the same number of turns and the sameis true of the vertical deflectin windings.
  • the number of turnsused in the deflecting windings depends upon various factors. It is generally desirable to supply the deflecting windings with deflecting current through a trans former so that a fewer number of turns may be used than would be required if the windings were driven directly from the output tube. By'using a transformer and a smaller number of winding turns, the distributed capacity of the winding is reduced, whereby it is easier to obtain a satisfactory ratio of scanning velocity to return line velocity.
  • a further advantage in the use of a low-impedance winding driven through a stepdown transformer lies in the fact that electrostatic coupling between horizontal and vertical deflecting windings is reduced as a result of the lower potential applied across the windings.
  • the vertical deflecting windings In order to get sufflcientinductance in the vertical deflecting windings to make possible the production of a good saw-tooth wave, they usually have a considerably larger number of turns than the horizontal deflecting windings. It will be understood that by the term vertical deflecting windings applicant means the deflecting windings which have the lower frequency deflecting wave applied thereto.
  • the magnetic sleeve I acts to increase the inductance of the vertical deflecting windings more than is practical merely by increasing the number of turns. Since this magnetic sleeve is much closer to the vertical deflecting windings than to the horizontal deflecting windings, it has a comparatively small eiiect on the horizontal windings.
  • each vertical deflecting winding has a total number of turns of 5600.
  • the vertical deflecting coils are supplied with deflecting current impulses at the rate of 60 per second through an auto-transformer having a step down ratio of 3:2, the output tube being of the 56 type.
  • the horizontal deflecting windings are supplied with deflecting current impulses at the rate of 10,290 per second through a step-down transformer having a turns ratio of 6:1, the output tube being of the 42" type.
  • the assembled defleeting device shown in Fig. 5 is slipped over the neck of the cathode ray tube and held in position, by any suitable means, for deflecting the cathode ray.
  • the deflecting device preferably, is used with a cathode ray tube of the type having electrostatic focusing for the cathode ray.
  • distributed winding means a winding of the well known distributed type commonly used in motors and generators and illustrated on pages 33 and 34 of Principles of Alternating Current Machinery by R. R. Lawrence, published by McGraw-Hill Book 00., New York, 1921, 2nd edition.
  • concentrically wound distributed winding means a winding of the type which is sometimes referred to as a spiral winding and which is illustrated on page 33 of the above-mentioned Lawrence publication and in Fig. 3 of the aboveidentified Tolson and Maloif patent.
  • a second pair of concentrically wound distributed windings which are diametrically opposed and which are curved to conform to a cylindrical surface of smaller diameter than said first surface, said second pair of windings being located inside said first pair of windings and substantially at right angles thereto, said two pairs of windings being concentrically positioned with respect to each other, and a sleeve of magnetic material surrounding said first pair of windings.
  • An electro-magnetic deflecting device for a. cathode ray tube, said device comprising a pair of concentrically wound distributed windings which are diametrically opposed and which are curved to conform to a cylindrical surface, and a second pair of concentrically wound distributed windings which are diametrically opposed'and which are curved to conform tda cylindrical surface of smaller diameter than said first surface, said second pair of windings being located inside said first pair of windings and substantially at right angles thereto, said two pairs of windings being concentrically positioned with respect to each other, and an electrostatic shield located between said two pairs of windings.
  • a cathode ray tube an electro-magnetic deflecting device for said cathode ray tube, said device comprising a pair of distributed windings which are diametrically opposed and which are curved to conform to a cylindrical surface, and a sleeve of magnetic material surrounding said windings.
  • a cathode ray tube an electro-magnetic deflecting device for said cathode ray tube, said device comprising a pair of concentrically wound distributed windings which are diametrically opposed and which are curved to conform to a cylindrical surface, and a sleeve of magnetic material surrounding said windings.
  • An electro-magnetic deflecting device for a cathode ray tube comprising a pair of distributed windings each of which is so curved that it occupies approximately 180 degrees, and each of which consists of a plurality of coils nested one within the other, and a sleeve of magnetic material surrounding said windings.
  • An electr c-magnetic deflecting device for a cathode ray tube comprising a pair of distributed windings 'each of which is curved to conform to a. cylindrical surface, and a sleeve of magnetic material surrounding said windings, said windings being so distributed that they produce a substantially uniform magnetic field in a plane substantially at right angles to the longitudinal axis of said cylindrical surface and in a region surrounded by said windings.
  • each of said windings consists of a plurality of coils concentrically positioned with respect to each other, each of said coils consisting of a plurality of turns.
  • an electro-magnetic deflecting device for a cathode-ray tube, said device comprising a cylindrical tube of insulating material, a pair of distributed windings which are positioned on said cylindrical tube in diametrically opposed relation and which are curved to conform to said cylindrical tube, a layer or insulating material surrounding said windings, a second pair of distributed windings which are diametrically opposed 11.
  • the invention according to claim 10 chatand which are curved to conform substantially to acterized in that there is a layer of conducting the outer surface of said first windings, said secmaterial between said two pairs of windings and pair oi. windings being positioned substanwhich functions as an electrostatic shield.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US66171A 1936-02-28 1936-02-28 Cathode ray tube deflecting device Expired - Lifetime US2167379A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IT349671D IT349671A (it) 1936-02-28
US66171A US2167379A (en) 1936-02-28 1936-02-28 Cathode ray tube deflecting device
FR816431D FR816431A (fr) 1936-02-28 1937-01-18 Dispositif déflecteur pour tube à rayon cathodique
GB6053/37A GB495016A (en) 1936-02-28 1937-03-01 Improvements in or relating to electro-magnetic deflecting coils for cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66171A US2167379A (en) 1936-02-28 1936-02-28 Cathode ray tube deflecting device

Publications (1)

Publication Number Publication Date
US2167379A true US2167379A (en) 1939-07-25

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US66171A Expired - Lifetime US2167379A (en) 1936-02-28 1936-02-28 Cathode ray tube deflecting device

Country Status (4)

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US (1) US2167379A (it)
FR (1) FR816431A (it)
GB (1) GB495016A (it)
IT (1) IT349671A (it)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428947A (en) * 1945-01-31 1947-10-14 Rca Corp Deflection device for cathode-ray tubes
US2463720A (en) * 1947-02-19 1949-03-08 Rca Corp Electron beam influencing apparatus
US2562395A (en) * 1949-02-23 1951-07-31 Motorola Inc Anastigmatic deflection yoke
US2562394A (en) * 1948-01-15 1951-07-31 Motorola Inc Electromagnetic deflection yoke
US2568456A (en) * 1949-12-06 1951-09-18 Gen Electric Electromagnetic deflection yoke structure
US2605433A (en) * 1950-12-19 1952-07-29 Rca Corp Magnetic shield for cathode-ray apparatus
US2689923A (en) * 1950-11-01 1954-09-21 Hartford Nat Bank & Trust Co Cathode-ray tube
US2692355A (en) * 1951-06-29 1954-10-19 Gen Instrument Corp Cathode-ray tube deflection yoke
US2831135A (en) * 1953-07-10 1958-04-15 Visseaux S A J Electromagnetic deflection means
US2855530A (en) * 1956-03-29 1958-10-07 Gen Dynamics Corp Convergence means
US2958037A (en) * 1957-02-08 1960-10-25 Univ Minnesota Magnetic shield for coils
US3526712A (en) * 1968-04-08 1970-09-01 Western Electric Co Coil mounting assembly
US3665597A (en) * 1969-10-03 1972-05-30 Philips Corp Deflection coil assembly
US3688394A (en) * 1971-05-20 1972-09-05 Philips Corp Method of making a deflection coil
US3710289A (en) * 1969-12-04 1973-01-09 Philips Corp Deflection coil
US3712133A (en) * 1970-07-24 1973-01-23 Statham Instrument Inc Flowmeter probe
US3855694A (en) * 1970-11-27 1974-12-24 Philips Corp Method of winding deflection coils for picture display tubes
US3968566A (en) * 1971-02-27 1976-07-13 Licentia Patent-Verwaltungs-G.M.B.H. Method of forming a deflection yoke system
US4039988A (en) * 1973-07-23 1977-08-02 U.S. Philips Corporation Deflection coil having sections with minimum winding density portions and spaces
US4700164A (en) * 1985-06-27 1987-10-13 Videocolor Magnetic deflecting yoke for cathode-ray tube with shortened neck

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE895916C (de) * 1940-07-06 1953-11-09 Fernseh Gmbh Magnetisches Ablenksystem fuer Bildfaengerroehren mit Vorabbildung

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428947A (en) * 1945-01-31 1947-10-14 Rca Corp Deflection device for cathode-ray tubes
US2463720A (en) * 1947-02-19 1949-03-08 Rca Corp Electron beam influencing apparatus
US2562394A (en) * 1948-01-15 1951-07-31 Motorola Inc Electromagnetic deflection yoke
US2562395A (en) * 1949-02-23 1951-07-31 Motorola Inc Anastigmatic deflection yoke
US2568456A (en) * 1949-12-06 1951-09-18 Gen Electric Electromagnetic deflection yoke structure
US2689923A (en) * 1950-11-01 1954-09-21 Hartford Nat Bank & Trust Co Cathode-ray tube
US2605433A (en) * 1950-12-19 1952-07-29 Rca Corp Magnetic shield for cathode-ray apparatus
US2692355A (en) * 1951-06-29 1954-10-19 Gen Instrument Corp Cathode-ray tube deflection yoke
US2831135A (en) * 1953-07-10 1958-04-15 Visseaux S A J Electromagnetic deflection means
US2855530A (en) * 1956-03-29 1958-10-07 Gen Dynamics Corp Convergence means
US2958037A (en) * 1957-02-08 1960-10-25 Univ Minnesota Magnetic shield for coils
US3526712A (en) * 1968-04-08 1970-09-01 Western Electric Co Coil mounting assembly
US3665597A (en) * 1969-10-03 1972-05-30 Philips Corp Deflection coil assembly
US3710289A (en) * 1969-12-04 1973-01-09 Philips Corp Deflection coil
US3712133A (en) * 1970-07-24 1973-01-23 Statham Instrument Inc Flowmeter probe
US3855694A (en) * 1970-11-27 1974-12-24 Philips Corp Method of winding deflection coils for picture display tubes
US3968566A (en) * 1971-02-27 1976-07-13 Licentia Patent-Verwaltungs-G.M.B.H. Method of forming a deflection yoke system
US3688394A (en) * 1971-05-20 1972-09-05 Philips Corp Method of making a deflection coil
US4039988A (en) * 1973-07-23 1977-08-02 U.S. Philips Corporation Deflection coil having sections with minimum winding density portions and spaces
US4700164A (en) * 1985-06-27 1987-10-13 Videocolor Magnetic deflecting yoke for cathode-ray tube with shortened neck

Also Published As

Publication number Publication date
FR816431A (fr) 1937-08-07
GB495016A (en) 1938-11-01
IT349671A (it)

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