US2152362A - Deflecting coil for cathode ray tubes - Google Patents
Deflecting coil for cathode ray tubes Download PDFInfo
- Publication number
- US2152362A US2152362A US101173A US10117336A US2152362A US 2152362 A US2152362 A US 2152362A US 101173 A US101173 A US 101173A US 10117336 A US10117336 A US 10117336A US 2152362 A US2152362 A US 2152362A
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- US
- United States
- Prior art keywords
- conductors
- coil
- axis
- ray
- tube
- 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
Links
- 239000004020 conductor Substances 0.000 description 38
- 238000004804 winding Methods 0.000 description 9
- 238000000926 separation method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
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 coil system lused for producing the deflecting field must have dimensions which are as small as possible. The conductors of the coil must therefore be disposed as close asv possible to the space in which the ray moves, without deleteriously affecting the homogeneity of the eld in this space.
- the deflecting coils in the form of rectangular coils and so to dispose them on both sides of the tube neck of a Braun tube that together they form a rectangular frame surrounding the neck of the tube.
- the longitudinal conductors in that case lie in two planes on both sides of the neck of the tube.
- the eld in the delecting space is not homogeneous since the lines of force in the vicinity of the tube axis are forced together and tend to deviate outwardly in a spread-apart manner.
- a homogeneous field is produced by means of coils constructed in a special manner.
- the coil is so formed that the longitudinal conductors which produce the deflecting field together constitute the casing of a cylinder disposed coaxial to the direction of the principal ray.
- the coil is so wound that on one side of an axial section taken through this cylinder the current iiows only in one direction and on the other side only in the other direction.
- the electrical axis of the coil therefore lies in this section and is perpendicular to the aXs of the cylinder or tube.
- the longitudinal conductors are preferably noneuniformly distributed on the casing surface and in such a manner that the current layer projected on the axial section and passing through the electrical axis of the coil is constant. Such a distribution of the winding permits the production of a Very homogeneous eld insi-de the coil space.
- the deflecting eld a shape in which the lines of force do not run parallel but rather converge or diverge in a definite manner.
- Such an arrangement is desirable e. g. when the deflection is ggA not to be effected with uniform strength over the deecting sp-ace, so as for example to describe a rectangular surface (not a trapezoidal surface) upon an obliquely reposing screen.
- the desired.I shape may be given to the deflecting field.
- Fig. 1 is a cross section through a deflecting coil and the deflecting space.
- Fig. 2 is a schematic side view of the coil of Fig. 1 taken in the direction of arrow A.
- Fig. 3 is across section through two deflecting coils pushed into each other, each being turned
- Fig. 4 is a cross section through a coil by means of which the eld is compressed in one direction.
- the coil shown in Figs. l and 2 and provided with longitudinal conductors I and side conductors 2 produces a homogeneous field 3 in its interior.
- a dividing surface 4 may be passed through the electrical axis of the coil said surface lying perpendicular to the axis of' the cylinder or tube.
- the portions of the side conductors 2 lying between the pairs of longitudinal conductors are preferably so bent around that they lie outside the cylindrical internal space formed by the longitudinal conductors.
- the windings which constitute the side conductors 2 are closer together than the windings of the longitudinal conductors l and the separations between the windings of the side conductors are uniform.
- two of the tubular coils 5 and 6 may be pushed into each other as shown in Fig. 3.
- the axis of 45 coil 5 may then be displaced 90 with respect to the axis of coil 6.
- the arrangement in this case is preferably so chosen that the coils may subsequently be displaced with respect to each other at least to a small angular amount.
- the longitudinal conductors are not distributed in a constant manner on the periphery of the circular cylinder, but in such a manner that the separation of the conductors or conductor groups projected on the axial section is constant for the same total current, as indicated in Fig. 1 by the heavier and lighter crosses and circles.
- the individual conductors are therefore distributed in varyingly dense manner and in such a manner that the windings of longitudinal conductors I which are furthest removed from the axis of the coil, lie closely against each other. The closer the longitudinal windings approach the axis of the coil, the more does the separation between the individual windings of longitudinal conductors I increase.
- 'Ihe coil of the invention may also be disposed within the tube, for which purpose it s mounted preferably on a ceramic member provided with recesses and/or grooves for receiving the individual wires or groups of Wires.
- a suitably shaped carrier for holding the coil may also be used exteriorly of the evacuated tube.
- the coil may be formed as a cone in order to be able to enshroud all of the space occupied by the deflected ray as closely as possible.
- means for producing a ray deflecting iield having a controlled intensity distribution in a plane normal to the undeflected ray axis comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors disposed parallel to the undeflected ray axis of said tube and end conductors concentric about said axis, said side conductors defining a cylindrical surface.
- means for producing a ray deliecting field having a controlled intensity distribution in a plane normal to the undeected ray axis comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors parallel to, and end conductors concentric about the undeiiected ray axis of said tube, said coils being so bent around the axis of said tube that said side conductors define a cylinder and are evenly spaced around the cylinder thus defined.
- means for producing a ray deiiecting iield having a controlled intensity distribution in planes normal to the undefiected ray axis comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors disposed along elements of a core whose axis is the axis of the undeiiected ray and end conductors concentric about the undeiiected ray axis of said tube, said coils being so formed about the axis of said tube that said side conductors define, and are evenly spaced about, a conical surface coaxial with said tube.
- means for producing a ray-deflecting iield of uniform strength in a plane normal to the undeiiected ray axis comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having end conductors concentric about said axis, and side conductors parallel thereto, said end conductors being so bent about said axis that said side conductors define a cylindrical surface, said side conductors being evenly distributed about the surface so defined.
Description
March 2s, 1939. E* RUSKA 2,152,362
DEFLECTING COIL FOR CTHODE RAY TUBES I Filed Sept. 16, 1936 Patented Mar. 28, 1939 PATENT oFFlcE DEFLECTING COIL FOR CATHODE- RAY TUBES Ernst vRuska, Berlin-Zehlendorf, Germany, as-
signor to the firm Fernseh Aktiengesellschaft, Zehlendorf, near Berlin, Germany Application September 16, 1936, Serial No. 101,173 In Germany September 30, 1935 `5 claims. (ol. 25o- 156) In cathode ray tubes such as for example oscillograph tubes and television transmitting and receiving tubes the problem arises of deecting the ray free from distortion in one or in a y number of directions. lIt is especially true, when the ray is not sharply bundled together, as is the case in ordinary television receiving tubes or in tubes using a photocell mosaic, so that the ray has a large cross-section'as'in the Farns- `worth image scanning tubes using a photocathode, that it is difficult to produce magnetic fields having an adequately homogeneous shape in the entire deflectional space. If the deflection in addition is to be effected at high frequency and of l adequate sensitivity so'as 'to-permit use of fewer ampere turns,4 the coil system lused for producing the deflecting field must have dimensions which are as small as possible. The conductors of the coil must therefore be disposed as close asv possible to the space in which the ray moves, without deleteriously affecting the homogeneity of the eld in this space. f'
It is already known to make the deflecting coils in the form of rectangular coils and so to dispose them on both sides of the tube neck of a Braun tube that together they form a rectangular frame surrounding the neck of the tube. The longitudinal conductors in that case lie in two planes on both sides of the neck of the tube. In such an arrangement, however, the eld in the delecting space is not homogeneous since the lines of force in the vicinity of the tube axis are forced together and tend to deviate outwardly in a spread-apart manner.
In accordance with the invention a homogeneous field is produced by means of coils constructed in a special manner. The coil is so formed that the longitudinal conductors which produce the deflecting field together constitute the casing of a cylinder disposed coaxial to the direction of the principal ray. The coil is so wound that on one side of an axial section taken through this cylinder the current iiows only in one direction and on the other side only in the other direction. The electrical axis of the coil therefore lies in this section and is perpendicular to the aXs of the cylinder or tube.
The longitudinal conductors are preferably noneuniformly distributed on the casing surface and in such a manner that the current layer projected on the axial section and passing through the electrical axis of the coil is constant. Such a distribution of the winding permits the production of a Very homogeneous eld insi-de the coil space.
In some case it is desirable to give the deflecting eld a shape in which the lines of force do not run parallel but rather converge or diverge in a definite manner. Such an arrangement is desirable e. g. when the deflection is ggA not to be effected with uniform strength over the deecting sp-ace, so as for example to describe a rectangular surface (not a trapezoidal surface) upon an obliquely reposing screen. In such a case, by suitably distributing the windings on the periphery of the cylinder, the desired.I shape may be given to the deflecting field.
Embodiments are illustrated in the figures of the drawing.
Fig. 1 is a cross section through a deflecting coil and the deflecting space.
Fig. 2 is a schematic side view of the coil of Fig. 1 taken in the direction of arrow A.
Fig. 3 is across section through two deflecting coils pushed into each other, each being turned Fig. 4 isa cross section through a coil by means of which the eld is compressed in one direction.
The coil shown in Figs. l and 2 and provided with longitudinal conductors I and side conductors 2 produces a homogeneous field 3 in its interior. A dividing surface 4 may be passed through the electrical axis of the coil said surface lying perpendicular to the axis of' the cylinder or tube. The portions of the side conductors 2 lying between the pairs of longitudinal conductors are preferably so bent around that they lie outside the cylindrical internal space formed by the longitudinal conductors. As shown in the schematic representation of Fig. 2 the windings which constitute the side conductors 2 are closer together than the windings of the longitudinal conductors l and the separations between the windings of the side conductors are uniform.
If the arrangement is such that the side conductors 2 lie within the cylinder exteriorly enshrouding the longitudinal conductors, two of the tubular coils 5 and 6 may be pushed into each other as shown in Fig. 3. The axis of 45 coil 5 may then be displaced 90 with respect to the axis of coil 6. The arrangement in this case is preferably so chosen that the coils may subsequently be displaced with respect to each other at least to a small angular amount. In order to obtain as homogeneous a eld as possible, the longitudinal conductors are not distributed in a constant manner on the periphery of the circular cylinder, but in such a manner that the separation of the conductors or conductor groups projected on the axial section is constant for the same total current, as indicated in Fig. 1 by the heavier and lighter crosses and circles. The individual conductors are therefore distributed in varyingly dense manner and in such a manner that the windings of longitudinal conductors I which are furthest removed from the axis of the coil, lie closely against each other. The closer the longitudinal windings approach the axis of the coil, the more does the separation between the individual windings of longitudinal conductors I increase.
In order to give the magnetic elds produced by coil 2 a shape such as is indicated for example in Fig. 4, an unsymmetrical distribution of the windings is used with respect to the cross section plane 1 in accordance with the crosses and points shown in Fig. 4.
'Ihe coil of the invention may also be disposed within the tube, for which purpose it s mounted preferably on a ceramic member provided with recesses and/or grooves for receiving the individual wires or groups of Wires. A suitably shaped carrier for holding the coil may also be used exteriorly of the evacuated tube.
In some cases it may be preferable to form the coil as a cone in order to be able to enshroud all of the space occupied by the deflected ray as closely as possible.
I claim:
1. In combination with a cathode ray tube, means for producing a ray deflecting iield having a controlled intensity distribution in a plane normal to the undeflected ray axis, comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors disposed parallel to the undeflected ray axis of said tube and end conductors concentric about said axis, said side conductors defining a cylindrical surface.
2. In combination with a cathode ray tube, means for producing a ray deliecting field having a controlled intensity distribution in a plane normal to the undeected ray axis, comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors parallel to, and end conductors concentric about the undeiiected ray axis of said tube, said coils being so bent around the axis of said tube that said side conductors define a cylinder and are evenly spaced around the cylinder thus defined.
3. In combination with a cathode ray tube having a conical shape, means for producing a ray deiiecting iield having a controlled intensity distribution in planes normal to the undefiected ray axis, comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having side conductors disposed along elements of a core whose axis is the axis of the undeiiected ray and end conductors concentric about the undeiiected ray axis of said tube, said coils being so formed about the axis of said tube that said side conductors define, and are evenly spaced about, a conical surface coaxial with said tube.
4. In combination with a cathode ray tube, means for producing a ray-deflecting iield of uniform strength in a plane normal to the undeiiected ray axis, comprising deflecting coils having a plurality of turns, each turn having a plurality of turns, each turn having end conductors concentric about said axis, and side conductors parallel thereto, said end conductors being so bent about said axis that said side conductors define a cylindrical surface, said side conductors being evenly distributed about the surface so defined.
5. In combination with a cathode ray tube having opposed deecting coils formed thereabout with side conductors parallel to, and end conductors concentric about the undeliected ray axis, said side conductors being positioned to define a cylinder concentric about said axis. means for producing a more intense field on one side of Said coils and symmetrical about a plane dividing said opposed coils, comprising a concentrated side conductor spacing on the side adjacent the desired intense iield.
ERNST RUSKA.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF80003A DE739047C (en) | 1935-09-30 | 1935-09-30 | Deflection coil system for electron beam tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
US2152362A true US2152362A (en) | 1939-03-28 |
Family
ID=6542838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US101173A Expired - Lifetime US2152362A (en) | 1935-09-30 | 1936-09-16 | Deflecting coil for cathode ray tubes |
Country Status (4)
Country | Link |
---|---|
US (1) | US2152362A (en) |
DE (1) | DE739047C (en) |
FR (1) | FR811507A (en) |
GB (1) | GB482513A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2616056A (en) * | 1951-02-09 | 1952-10-28 | Sylvania Electric Prod | Unsymmetrical deflection yoke |
US2645735A (en) * | 1952-04-19 | 1953-07-14 | Rca Corp | Precision deflecting yoke |
US2935691A (en) * | 1952-10-18 | 1960-05-03 | Bbc Brown Boveri & Cie | Process and apparatus to conduct out particles accelerated in an induction accelerator |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB494586A (en) * | 1937-04-27 | 1938-10-27 | Baird Television Ltd | Improvements in or relating to deflecting means for use with electron discharge devices |
GB514170A (en) * | 1938-04-27 | 1939-11-01 | British Thomson Houston Co Ltd | Improvements in the magnetic deflection of the ray in cathode ray tubes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB421603A (en) * | 1932-06-27 | 1934-12-27 | Loewe Opta Gmbh | Improvements relating to cathode-ray tubes for television |
NL45861C (en) * | 1932-07-13 | |||
NL44152C (en) * | 1933-10-02 | |||
BE406679A (en) * | 1933-12-07 |
-
1935
- 1935-09-30 DE DEF80003A patent/DE739047C/en not_active Expired
-
1936
- 1936-09-16 US US101173A patent/US2152362A/en not_active Expired - Lifetime
- 1936-09-30 FR FR811507D patent/FR811507A/en not_active Expired
- 1936-09-30 GB GB26501/36A patent/GB482513A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2616056A (en) * | 1951-02-09 | 1952-10-28 | Sylvania Electric Prod | Unsymmetrical deflection yoke |
US2645735A (en) * | 1952-04-19 | 1953-07-14 | Rca Corp | Precision deflecting yoke |
US2935691A (en) * | 1952-10-18 | 1960-05-03 | Bbc Brown Boveri & Cie | Process and apparatus to conduct out particles accelerated in an induction accelerator |
Also Published As
Publication number | Publication date |
---|---|
GB482513A (en) | 1938-03-30 |
DE739047C (en) | 1943-09-09 |
FR811507A (en) | 1937-04-16 |
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