EP0823723B1 - Cathode ray tube displays having saddle-type deflecting coils - Google Patents
Cathode ray tube displays having saddle-type deflecting coils Download PDFInfo
- 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
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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
-
- 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)
Description
Claims (3)
- A cathode ray tube display comprising:a cathode ray tube display main body (1, 10) having a glass panel (2, 11) and a glass funnel (3, 12) connected to the rear of the glass panel (2, 11);an electron gun attached a rear section of said main body (1, 10); anda deflection yoke (8, 17) arranged in a rear periphery portion of said main body (1, 10) which comprises a saddle-type horizontal coil (4, 13), an insulating frame (5, 14) located outside said saddle-type horizontal coil (4, 13), and a vertical coil and ferrite core (7, 16) located outside said insulating frame (5, 14), characterized in that a surface area of said saddle-type horizontal coil (4, 13) exposed from a screen-side end face of said ferrite core (7, 16) is within a range of 100 to 298 cm2, and the deflection yoke (8) is operable such, that the horizontal deflection frequency is 82 kHz, the vertical deflection frequency 71 kHz and the anode voltage is 25 kV.
- Cathode ray tube display according to claim 1, characterized in that the vertical coil is a saddle-type vertical coil (6, 15) or a toroidal coil.
- A cathode ray tube display comprising:a cathode ray tube display main body (1, 10) having a glass panel (2, 11) and a glass funnel (3, 12) connected to the rear of the glass panel (2, 11);an electron gun attached to a rear section of the main body (1, 10); anda deflection yoke (8, 17) arranged in a rear periphery portion of said main body (1, 10), which comprises a saddle-type horizontal coil (4, 13), an insulating frame (5, 14) located outside said saddle-type horizontal coil (4, 13), and a saddle-type vertical coil (6, 15) or toroidal vertical coil and ferrite core (7, 16) located outside said insulating frame (5, 14), characterized in that a surface area of said saddle-type vertical coil (6, 15) or toroidal vertical coil exposed from a screen-side end face of said ferrite core (7, 16) is within a range of 55 to 185 cm2 and the deflection yoke (8) is operable such, that the horizontal deflection frequency is 82 kHz, the vertical deflection frequency 71 kHz and the anode voltage is 25 kV.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69630685T DE69630685T2 (en) | 1996-08-07 | 1996-08-07 | Cathode ray tube display with saddle type deflection unit |
EP19960112723 EP0823723B1 (en) | 1996-08-07 | 1996-08-07 | Cathode ray tube displays having saddle-type deflecting coils |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19960112723 EP0823723B1 (en) | 1996-08-07 | 1996-08-07 | Cathode ray tube displays having saddle-type deflecting coils |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0823723A1 EP0823723A1 (en) | 1998-02-11 |
EP0823723B1 true EP0823723B1 (en) | 2003-11-12 |
Family
ID=8223087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960112723 Expired - Lifetime EP0823723B1 (en) | 1996-08-07 | 1996-08-07 | Cathode ray tube displays having saddle-type deflecting coils |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0823723B1 (en) |
DE (1) | DE69630685T2 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59186239A (en) * | 1983-04-05 | 1984-10-23 | Matsushita Electronics Corp | Deflection yoke |
JPH0652649B2 (en) * | 1984-02-22 | 1994-07-06 | 株式会社日立製作所 | Deflection yoke |
DE69017350T2 (en) * | 1989-10-25 | 1995-07-13 | Toshiba Kawasaki Kk | Color cathode ray tube. |
JP3061389B2 (en) * | 1989-10-27 | 2000-07-10 | 株式会社東芝 | Color picture tube equipment |
CA2157104C (en) * | 1994-08-29 | 2002-03-12 | Masanobu Honda | Deflection yoke and color cathode ray tube comprising the deflection yoke |
-
1996
- 1996-08-07 EP EP19960112723 patent/EP0823723B1/en not_active Expired - Lifetime
- 1996-08-07 DE DE69630685T patent/DE69630685T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69630685T2 (en) | 2004-09-23 |
EP0823723A1 (en) | 1998-02-11 |
DE69630685D1 (en) | 2003-12-18 |
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