EP0823723B1 - Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp - Google Patents

Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp Download PDF

Info

Publication number
EP0823723B1
EP0823723B1 EP19960112723 EP96112723A EP0823723B1 EP 0823723 B1 EP0823723 B1 EP 0823723B1 EP 19960112723 EP19960112723 EP 19960112723 EP 96112723 A EP96112723 A EP 96112723A EP 0823723 B1 EP0823723 B1 EP 0823723B1
Authority
EP
European Patent Office
Prior art keywords
saddle
coil
type
ray tube
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
EP19960112723
Other languages
English (en)
French (fr)
Other versions
EP0823723A1 (de
Inventor
Masanobu Honda
Toshio Ose
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to DE69630685T priority Critical patent/DE69630685T2/de
Priority to EP19960112723 priority patent/EP0823723B1/de
Publication of EP0823723A1 publication Critical patent/EP0823723A1/de
Application granted granted Critical
Publication of EP0823723B1 publication Critical patent/EP0823723B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • H01J29/006—Arrangements for eliminating unwanted temperature effects

Definitions

  • This invention relates to cathode ray tube displays having saddle-type deflecting coils, more specifically, cathode ray tube displays improved to reduce temperature rise of their deflection yokes.
  • the vertical deflection frequency is generally predetermined to be at least 70Hz while the conventional frequency is 60Hz.
  • EP-A-0 424 946 A2 refers to a color cathode ray tube apparatus having reflection means in form of saddle-type horizontal and saddle-type vertical coils.
  • the ray tube apparatus has an extended cylindrical neck accomodating an electron gun for outputting three in-line electron beams.
  • the deflection means are arranged to extend on outer surfaces of said neck and the funnel.
  • the length of the saddle-type horizontal deflection coil in a direction to the tube axis should not be less than 90 mm to improve the heat radiation characteristics.
  • Patent abstracts of JP, Vol. 10, no. 11 (E-374) & JP-A-60175345 discloses a deflection yoke which has a saddle-type horizontal deflection coil.
  • the conductive part of the frontal end or the rear end of the horizontal deflection coil as saddle shape on the core while bending the same in the centre direction of the deflection yoke outside the core.
  • This invention aims to provide cathode ray tube displays which reduce the temperature rise of the deflection yokes without using either extra-fine wires or litz wires. For this purpose, the radiation of heat from the saddle-type coils is increased.
  • the cathode ray tube display of this invention comprises a cathode ray tube main body and a deflection yoke located at the rear periphery of the main body.
  • the deflection yoke comprises a saddle-type horizontal coil, an insulating frame located outside the saddle-type horizontal coil, a vertical coil and a ferrite core located outside the insulating frame.
  • the saddle -type horizontal coil is partially exposed from the screen-side end face of the ferrite core toward the screen.
  • the first structural characteristic of this invention is that the surface area of the exposed portion of the saddle-type horizontal coil is predetermined to be from 100 cm 2 to 298 cm 2 .
  • the vertical coil can be a saddle-type vertical coil or a toroidal coil.
  • the saddle-type vertical coil is also partially exposed from the screen-side end face of the ferrite core toward the screen.
  • the second structural characteristic of this invention according to claim 3 is that the surface area of the exposed portion of the saddle-type or toroidal vertical coil is predetermined to be from 55 cm 2 to 185 cm 2 .
  • the exposed portion of either the saddle-type horizontal coil or the saddle-type vertical coil is increased so that the heat radiation effect is improved. Therefore, the temperature rise of the deflection yoke can be reduced without using either extra-fine wires or litz wires.
  • the heating-up is reduced by decreasing the ohmic loss and the eddy current loss of the saddle-type coils.
  • Another method is to promote the heat radiation from the deflection yoke (saddle-type coils). This invention focuses on the latter method.
  • the temperature of the saddle-type coils of the deflection yoke changes corresponding to time.
  • Q indicates the heat which the saddle-type coils generate in a unit time.
  • W indicates the mass of the saddle-type coils.
  • A indicates the surface area of the saddle-type coils.
  • a indicates the heat radiation coefficient.
  • c indicates the specific heat of the saddle-type coils, and
  • ⁇ indicates the temperature rise.
  • the heat generated during the time dt is Qdt. This heat partially raises the temperature of the saddle-type coils by d ⁇ , and the rest of the heat is radiated from the surface of the saddle-type coils during the time dt. Therefore, the heat equilibrium can be represented by equation (1).
  • Q • dt c • W • d ⁇ + a • A • ⁇ • dt
  • ⁇ f Q / (a • A)
  • T c • W / (a • A)
  • Heat convection phenomenon should also be taken into consideration in improving the heat radiation effect of the saddle-type coils.
  • FIG. 3 when an object of t°C is in air of t o °C (t > t o ), the air near the surface of the object receives the object's heat by contact and radiation, and becomes lighter as its temperature rises. Thus, convections are generated so that the air takes away the heat.
  • "a c " indicates the heat which is taken away from a unit of surface area in a unit time due to this heat convection. The value of a c becomes bigger as the difference (t - t o ) between the temperatures of the object and that of the air is greater (cf. equation (5)).
  • a c C • H -1/4 (t - t o ) 5/4 [W / (m 2 • °C)]
  • C indicates the constant and H indicates the height of the object. Therefore, the air contacting with the object should be as cool as possible so that the temperature rise of the saddle-type coils can be reduced.
  • the saddle-type coils of the cathode ray tube display of this invention improves the heat radiation effect.
  • the surface area of the deflection yoke which is not surrounded with the ferrite core is enlarged so that the heat radiating surface area is increased and the heat convection is promoted.
  • FIG. 1 is a plan view of a cathode ray tube display of the first embodiment of this invention.
  • FIG. 2 is a side view of a cathode ray tube display of the second embodiment of this invention.
  • FIG. 3 is a schematic view describing heat radiation due to heat convection.
  • FIG. 4 is a graph showing the relation between the exposed surface area of the saddle-type horizontal coil and the temperature rise of the same coil.
  • the saddle-type horizontal coil is partially exposed from the screen-side end face of the ferrite core of the deflection yoke toward the screen.
  • FIG. 5 is a graph showing the relation between the exposed surface area of the saddle-type vertical coil and the temperature rise of the same coil.
  • the saddle-type vertical coil is partially exposed from the screen-side end face of the ferrite core of the deflection yoke toward the screen.
  • FIG. 1 is a plan view of a 41cm(17") • 90° cathode ray tube display according to the first embodiment of this invention.
  • a cathode ray tube main body 1 comprises a glass panel 2 and a glass funnel 3 connected to the rear of the glass panel 2.
  • An electron gun (not shown) is attached to the rear of the glass funnel 3.
  • a deflection yoke 8 is attached to the rear periphery of the glass funnel 3.
  • the deflection yoke 8 comprises a saddle-type horizontal coil 4, an insulating frame 5 located outside the saddle-type horizontal coil 4, a saddle-type vertical coil 6 located outside the insulating frame 5, and a ferrite core 7 located outside the saddle-type vertical coil 6.
  • the saddle-type coils (4, 6) are formed by winding a bundle of normal wires (not litz wires) of 0.25mm diameter.
  • Numeral 9 indicates the screen-side end face of the ferrite core 7.
  • the saddle-type horizontal coil is partially exposed from the end face 9 toward the screen, and the surface area of the exposed part is set to be 185cm 2 .
  • FIG. 4 indicates the relation between the exposed surface area S H of the saddle-type horizontal coil 4 and the temperature rise ⁇ t H of the same coil.
  • the shapes and positions of the insulating frame 5, the saddle-type vertical coil 6 and the ferrite core 7 are illustrated in FIG. 1.
  • the deflection yoke 8 is operated such that the horizontal deflecting frequency is 82kHz, the vertical deflection frequency is 71Hz, anode voltage is 25kV, and the raster size is 309 ⁇ 232mm.
  • the temperature rise ⁇ t H of the saddle-type horizontal coil 4 is defined by the difference between the highest temperature of the saddle-type horizontal coil 4 and the average ambient temperature around the deflection yoke 8.
  • the surface area S H is varied by fixing the wire winding angle and extending the coil to the screen side.
  • the ⁇ t H reducing effect appears when S H is 100cm 2 or more.
  • the value of ⁇ t H is the smallest when S H is 185cm 2 , and later the value of ⁇ t H increases.
  • FIG. 2 is a side view of a 41cm(17") • 90° cathode ray tube display according to the second embodiment of this invention.
  • a cathode ray tube main body 10 comprises a glass panel 11 and a glass funnel 12 connected to the rear of the glass panel 11.
  • An electron gun (not shown) is attached to the rear of the glass funnel 12.
  • a deflection yoke 17 is attached to the rear periphery of the glass funnel 12.
  • the deflection yoke 17 comprises a saddle-type horizontal coil 13, an insulating frame 14 located outside the saddle-type horizontal coil 13, a saddle-type vertical coil 15 located outside the insulating frame 14, and a ferrite core 16 located outside the saddle-type vertical coil 15.
  • the saddle-type coils (13, 15) are formed by winding a bundle of normal wires (not litz wires) of 0.25mm diameter.
  • Numeral 18 indicates the screen-side end face of the ferrite core 16.
  • the saddle-type vertical coil is partially exposed from the end face 18 toward the screen, and the surface area of the exposed part is predetermined to be 115cm 2 .
  • FIG. 5 indicates the relationship between the exposed surface area S v of the saddle-type vertical coil 15 and the temperature rise ⁇ t v of the same coil.
  • the shapes and positions of the insulating frame 14, the saddle-type horizontal coil 13 and the ferrite core 16 are shown in FIG. 2.
  • the deflection yoke 17 is operated such that the horizontal deflecting frequency is 82kHz, the vertical deflection frequency is 71Hz, anode voltage is 25kV, and the raster size is 309 ⁇ 232mm.
  • the temperature rise ⁇ t v of the saddle-type vertical coil 15 is defined by the difference between the highest temperature of the saddle-type vertical coil 15 and the average ambient temperature around the deflection yoke 17.
  • the surface area S v is varied by fixing the wire winding angle and extending the coil to the screen side.
  • the ⁇ t v reducing effect appears when S v is 55cm 2 or more.
  • the value of ⁇ t v is lowest when S v is 115cm 2 .
  • the value of ⁇ t v continues to increase until, at 185cm 2 , ⁇ t v again decreases.
  • This result occurs because eddy current loss due to the increase of interlinkage between the horizontal deflection magnetic field and the saddle-type vertical coil 15 as S v becomes bigger.
  • the interlinkage and the eddy current loss are saturated if the value of S v exceeds 185cm 2 .
  • the saddle-type vertical coil 15 becomes too large, and the direct current resistance is increased. Such equipment cannot be practically used.
  • the surface area S v is set to be 115cm 2 in this embodiment.
  • the temperature rise ⁇ t v of the saddle-type vertical coil 15 can be reduced if S v ranges from 55 to 185cm 2 .
  • the deflection yoke of each embodiment explained above comprises a saddle-type vertical coil.
  • the vertical coil can be replaced by a troidal type coil.
  • a troidal type vertical coil can be wound on the ferrite core.
  • the cathode ray tube display of this invention can improve its heat radiation effect and reduce temperature rise.
  • the surface area of the saddle-type coil part which is exposed from the screen-side end face of the ferrite core of the deflection yoke toward the screen is enlarged in order to create the effect of expanding radiation surface area and convection of the heat. Therefore, neither expensive extra-fine wires nor litz wires are necessary for these saddle-type coils. In addition, the breakage of wires can be reduced during the coil winding process.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Claims (3)

  1. Kathodenstrahlröhrendisplay, das folgendes umfaßt:
    einen Kathodenstrahlröhrendisplay-Hauptkörper (1, 10) mit einer Glasplatte (2, 11) und einem Glastrichter (3, 12), der mit dem hinteren Teil der Glasplatte (2, 11) verbunden ist;
    eine Elektronenkanone, die mit einem hinteren Abschnitt des Hauptkörpers (1, 10) verbunden ist; und
    ein in einem hinteren Peripherieteil des Hauptkörpers (1, 10) angeordnetes Ablenkjoch (8, 17), das folgendes umfaßt: eine sattelartige Horizontalspule (4, 13), einen Isolierrahmen (5, 14), der außerhalb der sattelartigen Horizontalspule (4, 13) angeordnet ist, und eine Vertikalspule und einen Ferritkern (7, 16), die außerhalb des Isolierrahmens (5, 14) angeordnet sind, dadurch gekennzeichnet, daß ein Flächeninhalt der sattelartigen Horizontalspule (4, 13), der von einer schirmseitigen Stirnfläche des Ferritkerns (7, 16) freiliegt, im Bereich zwischen 100 und 298 cm2 liegt, und das Ablenkjoch (8) derart betrieben werden kann, daß die Horizontalablenkfrequenz 82 kHz, die Vertikalablenkfrequenz 71 kHz und die Anodenspannung 25 kV betragen.
  2. Kathodenstrahlröhrendisplay nach Anspruch 1, dadurch gekennzeichnet, daß die Vertikalspule eine sattelartige Vertikalspule (6, 15) oder eine Ringspule ist.
  3. Kathodenstrahlröhrendisplay, das folgendes umfaßt:
    einen Kathodenstrahlröhrendisplay-Hauptkörper (1, 10) mit einer Glasplatte (2, 11) und einem Glastrichter (3, 12), der mit dem hinteren Teil der Glasplatte (2, 11) verbunden ist;
    eine Elektronenkanone, die mit einem hinteren Abschnitt des Hauptkörpers (1, 10) verbunden ist; und
    ein in einem hinteren Peripherieteil des Hauptkörpers (1, 10) angeordnetes Ablenkjoch (8, 17), das folgendes umfaßt: eine sattelartige Horizontalspule (4, 13), einen Isolierrahmen (5, 14), der außerhalb der sattelartigen Horizontalspule (4, 13) angeordnet ist, und eine sattelartige Vertikalspule (6, 15) oder ringförmige Vertikalspule und einen Ferritkern (7, 16), die außerhalb des Isolierrahmens (5, 14) angeordnet sind, dadurch gekennzeichnet, daß ein Flächeninhalt der sattelartigen Vertikalspule (6, 15) oder der ringförmigen Vertikalspule, der von einer schirmseitigen Stirnfläche des Ferritkerns (7, 16) freiliegt, im Bereich zwischen 55 und 185 cm2 liegt, und das Ablenkjoch (8) derart betrieben werden kann, daß die Horizontalablenkfrequenz 82 kHz, die Vertikalablenkfrequenz 71 kHz und die Anodenspannung 25 kV betragen.
EP19960112723 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp Expired - Lifetime EP0823723B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69630685T DE69630685T2 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp
EP19960112723 EP0823723B1 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19960112723 EP0823723B1 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp

Publications (2)

Publication Number Publication Date
EP0823723A1 EP0823723A1 (de) 1998-02-11
EP0823723B1 true EP0823723B1 (de) 2003-11-12

Family

ID=8223087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960112723 Expired - Lifetime EP0823723B1 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp

Country Status (2)

Country Link
EP (1) EP0823723B1 (de)
DE (1) DE69630685T2 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186239A (ja) * 1983-04-05 1984-10-23 Matsushita Electronics Corp 偏向ヨ−ク
JPH0652649B2 (ja) * 1984-02-22 1994-07-06 株式会社日立製作所 偏向ヨ−ク
EP0424888B1 (de) * 1989-10-25 1995-03-01 Kabushiki Kaisha Toshiba Farbbildkathodenstrahlröhre
JP3061389B2 (ja) * 1989-10-27 2000-07-10 株式会社東芝 カラー受像管装置
CA2157104C (en) * 1994-08-29 2002-03-12 Masanobu Honda Deflection yoke and color cathode ray tube comprising the deflection yoke

Also Published As

Publication number Publication date
DE69630685D1 (de) 2003-12-18
EP0823723A1 (de) 1998-02-11
DE69630685T2 (de) 2004-09-23

Similar Documents

Publication Publication Date Title
US5859495A (en) Deflection yoke and color cathode ray tube comprising the deflection yoke
EP0823723B1 (de) Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp
US5668436A (en) Cathode ray tube displays having saddle-type deflecting coils
US6614157B2 (en) Cathode-ray tube
EP0989581A1 (de) Kathodenstrahlröhre
KR100235909B1 (ko) 음극선관표시장치
JP2002510430A (ja) インライン電子銃を備えるカラー受像管
JP3031838B2 (ja) 陰極線管装置
US6008574A (en) Deflection yoke providing improved image quality
EP1178514B1 (de) Kathodenstrahlröhre
US6590329B2 (en) Deflection yoke with a low power consumption
US5942846A (en) Deflection yoke with horizontal deflection coil
CA2360570C (en) Deflection yoke and color cathode ray tube comprising the deflection yoke
JP3402073B2 (ja) 受像管装置
JP3501589B2 (ja) 陰極線管
JPH0315112A (ja) 偏向コイル用リッツ線
JP3192326B6 (ja) 偏向ヨーク及びこの偏向ヨークを装着したカラー陰極線管
JPH11312477A (ja) 陰極線管表示装置
JPH11176352A (ja) 偏向ヨーク
JPH0141153Y2 (de)
KR20030022979A (ko) 편향요크
JP2002110069A (ja) 陰極線管装置
JP2002117786A (ja) 偏向ヨーク

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19970228

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL SE

AKX Designation fees paid

Free format text: DE FR GB IT NL SE

RBV Designated contracting states (corrected)

Designated state(s): DE FR GB IT NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 69630685

Country of ref document: DE

Date of ref document: 20031218

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040212

NLR4 Nl: receipt of corrected translation in the netherlands language at the initiative of the proprietor of the patent
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040813

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050803

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050804

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050809

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20050815

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060831

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070301

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070301

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060807

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20070301

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20070430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060807

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070807