EP0823723A1 - Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp - Google Patents

Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp Download PDF

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Publication number
EP0823723A1
EP0823723A1 EP96112723A EP96112723A EP0823723A1 EP 0823723 A1 EP0823723 A1 EP 0823723A1 EP 96112723 A EP96112723 A EP 96112723A EP 96112723 A EP96112723 A EP 96112723A EP 0823723 A1 EP0823723 A1 EP 0823723A1
Authority
EP
European Patent Office
Prior art keywords
saddle
type
coil
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.)
Granted
Application number
EP96112723A
Other languages
English (en)
French (fr)
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EP0823723B1 (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 Electronics 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
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to EP19960112723 priority Critical patent/EP0823723B1/de
Priority to DE69630685T priority patent/DE69630685T2/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

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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
    • 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.
  • 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 saddle-type 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 100cm 2 to 298cm 2 .
  • 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 is that the surface area of the exposed portion of the saddle-type vertical coil is predetermined to be from 55cm 2 to 185cm 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 indicates the final temperature of the saddle-type coils and T indicates time constant, both of which are obtained from the following equation (3) or (4).
  • ⁇ 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 boil 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.

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  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
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
EP19960112723 EP0823723B1 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp
DE69630685T DE69630685T2 (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 true EP0823723A1 (de) 1998-02-11
EP0823723B1 EP0823723B1 (de) 2003-11-12

Family

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EP19960112723 Expired - Lifetime EP0823723B1 (de) 1996-08-07 1996-08-07 Kathodenstrahlröhrenanzeige mit Ablenkeinheit vom Satteltyp

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

Citations (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
JPS60175345A (ja) * 1984-02-22 1985-09-09 Hitachi Ltd 偏向ヨ−ク
EP0424888A2 (de) * 1989-10-25 1991-05-02 Kabushiki Kaisha Toshiba Farbbildkathodenstrahlröhre
EP0424946A2 (de) * 1989-10-27 1991-05-02 Kabushiki Kaisha Toshiba Farbkathodenstrahlröhre
EP0700067A1 (de) * 1994-08-29 1996-03-06 Matsushita Electronics Corporation Ablenkjoch und Ablenkjoch enthaltende Farbkathodenstrahlröhre

Patent Citations (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
JPS60175345A (ja) * 1984-02-22 1985-09-09 Hitachi Ltd 偏向ヨ−ク
EP0424888A2 (de) * 1989-10-25 1991-05-02 Kabushiki Kaisha Toshiba Farbbildkathodenstrahlröhre
EP0424946A2 (de) * 1989-10-27 1991-05-02 Kabushiki Kaisha Toshiba Farbkathodenstrahlröhre
EP0700067A1 (de) * 1994-08-29 1996-03-06 Matsushita Electronics Corporation Ablenkjoch und Ablenkjoch enthaltende Farbkathodenstrahlröhre

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 047 (E - 299) 27 February 1985 (1985-02-27) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 011 (E - 374) 17 January 1986 (1986-01-17) *
TOSHIO KURAMOTO ET AL: "THE SSC DEFLECTION YOKE FOR IN-LINE COLOR CRTS", PROCEEDINGS OF THE SID, vol. 30, no. 1, 1 January 1989 (1989-01-01), pages 29 - 32, XP000115923 *

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Publication number Publication date
DE69630685T2 (de) 2004-09-23
DE69630685D1 (de) 2003-12-18
EP0823723B1 (de) 2003-11-12

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