JP3031838B2 - Cathode ray tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device,
The present invention relates to a cathode ray tube device with improved temperature rise of a deflection yoke.

[0002]

2. Description of the Related Art In a recent display monitor,
With the spread of Windows, the amount of display information tends to increase, and the required resolution is also increasing. For example, 1024 × 768 for personal computers
The resolution of dots is becoming common, and the resolution of 1600 × 1028 dots is becoming widespread for workstations. In addition, since the display with a white background is frequently used in Windows, the average luminance of the screen increases and flicker becomes noticeable. Therefore, the vertical deflection frequency is set to 70 Hz or more with respect to the conventional 60 Hz. Is common.

[0003] Such an increase in resolution and an increase in the vertical deflection frequency inevitably mean an increase in the horizontal deflection frequency. Therefore, a rise in the temperature of the deflection yoke mounted on the cathode ray tube and used becomes a problem. .

As a method of suppressing the temperature rise, for example, as disclosed in Japanese Patent Application Laid-Open No. Sho 59-186239, the wire diameter of a wire forming a saddle type coil of a deflection yoke is reduced to 0.15 mm or less. In general, a method of reducing heat generation due to the skin effect or reducing heat generation due to eddy current loss using a collective stranded wire is generally used.

[0005]

However, the disadvantages of the method of forming a saddle-type coil using a wire having a small element wire diameter or a collective stranded wire are that disconnection is apt to occur in a winding process at the time of manufacturing and that the wire itself is not used. Cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional drawback. By increasing the heat radiation of a saddle type coil, the temperature of the deflection yoke can be increased without using extra fine wires or collective twisted wires. It is an object of the present invention to provide a cathode ray tube device in which the noise is suppressed.

[0007]

A first feature of a cathode ray tube apparatus according to the present invention for achieving the above object is that a cathode ray tube body is disposed on a rear outer periphery of a cathode ray tube main body, and is provided with a saddle type horizontal coil and an outer side thereof. And a deflection yoke including a saddle-type vertical coil and a ferrite core provided outside the insulation frame, the ferrite core being exposed from the screen side end surface of the ferrite core to the screen side. The point is that the surface area of the saddle type horizontal coil portion is set to 100 cm ² or more and 298 cm ² or less.

The second feature is that the surface area of the saddle type vertical coil portion exposed from the screen side end surface of the ferrite core to the screen side is 55 cm ² or more and 185 or more.
cm ² or less.

[0009]

According to the first or second characteristic configuration, the area exposed from the ferrite core of the saddle-type horizontal coil or the saddle-type vertical coil of the deflection yoke is increased to improve the heat radiation effect. The temperature rise of the deflection yoke can be suppressed without using wires or collective twisted wires. The details of the operation will be described below.

[0010] The temperature rise due to the change in the energy loss when the deflection yoke is operated into heat starts at the start of the operation, and after a predetermined time has elapsed, the temperature is in an equilibrium state. The energy loss in the saddle type coil is very large, and is a major factor in the temperature rise of the deflection yoke. Further, as the horizontal deflection frequency increases, the resistance loss and the eddy current loss due to the skin effect of the wire forming the saddle type coil increase, and the temperature rise of the deflection yoke becomes remarkable. As a method for suppressing the temperature rise, there are a method of reducing the heat loss by reducing the resistance loss and the eddy current loss of the saddle type coil, and a method of promoting heat radiation from the deflection yoke (saddle type coil). . The present invention has been made focusing on the latter.

Here, consider the time-dependent temperature change of the saddle type coil of the deflection yoke. Q is the amount of heat generated by the saddle type coil per unit time, W is the mass of the saddle type coil, A is the surface area of the saddle type coil, a is the heat dissipation coefficient,
Assuming that the specific heat of the saddle type coil is c and the temperature rise is θ, the heat generated during the time dt is Qdt, and part of this heat raises the temperature of the saddle type coil by dθ, and the other time is dt. During this time, it is dissipated outside from the surface of the saddle-shaped coil. Therefore, the equation representing the thermal equilibrium is as follows (Equation 1).

[0012]

## EQU00001 ## Q.dt = c.W.d.theta. + A.A..theta..d
t When the initial condition of the temperature rise θ is set to zero and the equation (Equation 1) is solved, the following equation (Equation 2) is obtained.

[0013]

[Number 2] _{θ = θ f · (1-} e -t / T) where, theta _f represents the final temperature of the saddle type coil, T a time constant, respectively, the following equation (3) and (4) Required from.

[0014]

Equation 3 θ _f = Q / (a · A)

[0015]

T = c · W / (a · A) Assuming that the heat dissipation coefficient a is constant, to suppress the temperature rise of the saddle-shaped coil, Q should be smaller than the equation (Equation 3). Or increase A. Reducing Q means reducing the resistance loss and the eddy current loss in the saddle coil, or improving the deflection sensitivity of the saddle coil to reduce the current consumption. On the other hand, increasing A means increasing the surface area of the saddle coil.

Further, in order to improve the heat radiation effect of the saddle type coil, it is necessary to consider a heat convection phenomenon. Generally, as shown in FIG. 3, the object temperature t ₀ ° C. of temperature t ° C.
When in the air of (t> t ₀ ), the air near the surface of the object receives heat from the object by contact and radiation, and the temperature rises and becomes light, so that convection occurs and the heat is removed. Heat a _c carried away from the unit surface area in a unit time by convection of the heat, as indicated by the following equation (5), as the difference between the temperature of the object and the air (t-t ₀₎ is greater increases Become.

[0017]

A _c = C · H ^−1/4 (t−t ₀ ) ^5/4 [W
/ (M ² · ° C.)] where C is a constant and H is the height of the object. Therefore,
In order to suppress the rise in the temperature of the saddle type coil, a structure that can be brought into contact with air at a temperature as low as possible is required.

Based on these reasons, the saddle type coil according to the present invention increases the surface area of the deflection yoke portion not surrounded by the ferrite core which is one of the heat sources,
Due to the effect of increasing the heat dissipation area and the effect of heat convection,
The heat radiation effect is improved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of 41 cm according to the present invention.
1 is a plan view of a 90 ° cathode ray tube device, in which a cathode ray tube main body 1 is composed of a glass panel portion 2 and a glass funnel portion 3 connected to a rear portion thereof. Is provided with an electron gun (not shown), and on the outer periphery of the rear portion of the glass funnel portion 3, a wire material (not in the form of a collective twisted wire) in which wires having a wire diameter of 0.25 mm are bundled is provided. A saddle-type horizontal coil 4 formed by winding, an insulating frame 5 provided outside thereof, and a saddle formed by winding a wire material provided outside thereof and also bundling wires having a wire diameter of 0.25 mm. A deflection yoke 8 composed of a mold vertical coil 6 and a ferrite core 7 provided outside thereof is mounted.
The surface area of the saddle type horizontal coil portion exposed from the screen side end surface 9 to the screen side is set to 185 cm ² .

[0021] FIG. 4, subscription of the ferrite core 7 - subscriptions from emission side end surface 9 - Temperature rise of the surface area of the saddle-type horizontal coil portion exposed to the down side S _H and the saddle-type horizontal coil 4 delta
The relationship with t _H is shown. Here, the shapes and positions of the insulating frame 5, the saddle type vertical coil 6, and the ferrite core 7 are shown in FIG.
The deflection yoke 8 was operated under the conditions of a horizontal deflection frequency of 82 kHz, a vertical deflection frequency of 71 Hz, an anode voltage of 25 kV, and a raster size of 309 × 232 mm. Further, the temperature rise Δt of the saddle type horizontal coil 4
_H is the maximum temperature of the saddle type horizontal coil 4 and the deflection yoke 8
It is defined as the difference from the surrounding average ambient temperature.
Subscription of the ferrite core 7 - subscriptions from emission side end surface 9 - surface area S _H of the saddle-type horizontal coil portion exposed to the down side,
The winding angle of the wire was fixed, and the length was changed by extending the coil length to the screen side.

According to FIG._HIs 100cm^TwoOver
Then Δt_HEffect appears, and S_HIs 185cm^TwoAnd Δt_H
Becomes minimum and then Δt_HIs increasing. this is,
S_HIn order to increase the size, the coil of saddle type horizontal coil 4
When the length of the tool is extended toward the screen, the center of deflection is
The shift to the screen side deteriorates the deflection sensitivity, and
_HThis is because the reduction effect of_HIs 298cm^Two
Exceeds Δt_HThe effect of the reduction is lost. Such a view
From this point, in this embodiment, the screen side of the ferrite core 7 is
Saddle-type horizontal coil exposed on the screen side from end face 9
Part surface area S_H185cm^Two, But S_H
Is 100cm^TwoMore than 298cm^TwoIf it is within the following range,
Temperature rise Δt of dollar-shaped horizontal coil 4_H Get the effect of reducing
be able to.

Next, FIG. 2 shows a fourth embodiment according to the present invention.
FIG. 1 shows a side view of a 1 cm (17 ″) 90 ° cathode ray tube device. As in the first embodiment, a cathode ray tube main body 10 is constituted by a glass panel section 11 and a glass funnel section 12 connected to the rear thereof. And glass funnel 12
An electron gun (not shown) is provided at the rear of the camera. In addition, a wire diameter of 0.3 mm is provided on the outer periphery of the rear portion of the glass funnel portion 12.
Saddle type horizontal coil 13 formed by winding a wire (not in the form of a collective twisted wire) obtained by bundling 25 mm strands
And an insulating frame 14 provided outside thereof, a saddle type vertical coil 15 formed by winding a wire bundled together with wires having a wire diameter of 0.25 mm provided outside thereof, and a saddle type vertical coil 15 Ferrite core 16 provided outside
And a surface area of a saddle type vertical coil portion exposed to the screen side from the screen side end face 18 of the ferrite core 16 is 115 cm.
Set to ² .

FIG. 5 shows the relationship between the surface area S _V of the saddle type vertical coil portion exposed from the screen side end surface 18 of the ferrite core 16 to the screen side and the temperature rise Δt _V of the saddle type vertical coil 15. . Here, the shapes and positions of the insulating frame 14, the saddle-type horizontal coil 13, and the ferrite core 16 are as shown in FIG.
kHz, vertical deflection frequency 71Hz, anode voltage 25k
V, the deflection yoke 17 was operated under the conditions of a raster size of 309 × 232 mm. The temperature rise Δt _V of the saddle type vertical coil 15 is defined by the difference between the maximum temperature of the saddle type vertical coil 15 and the average ambient temperature around the deflection yoke 17. Subscription of the ferrite core 16 - subscription from emission side end surface 18 - the surface area S _V saddle type vertical coil portion exposed to the down side, to secure the winding angle of the wire, subscriptions - to distract the coil length down side It is changed by.

According to FIG. 5, appear the effect of reducing the Delta] t _V when S _V is 55cm ² or more, Delta] t _V S _V are in 115cm ² represents the minimum value, further, S _V is a maximum at 185cm ² After that, Δt _V decreases again. This, as a larger S _V, the horizontal deflection magnetic field and the saddle-type vertical coil 1
Eddy current loss is increased due to the increased chain interlinkage with 5, S _V 1
This is because the number of interlinkage becomes saturated and the eddy current loss becomes saturated when it exceeds 85 cm ² . Incidentally, at the same time when the S _V exceeds 185cm ² the shape of the saddle-type vertical coil 15 becomes very large, it is impossible to practically use increases also its DC resistance.

[0026] From this point of view, the ferrite core 16 in this embodiment Subscription - subscription from emission side end surface 18 - a surface area S _V saddle type vertical coil portion exposed to the down side 11
But is set to 5cm ^2, S _V is 55cm ² or more 185
Within the range of cm ² or less, the effect of reducing the temperature rise Δt _V of the saddle type vertical coil 15 can be obtained.

In the above embodiment, the deflection yoke provided with the saddle type vertical coil has been described. However, the vertical coil may be of a toroidal type. It may be.

[0028]

As described above, according to the cathode ray tube device of the present invention, the screen of the ferrite core of the deflection yoke is removed.
The surface area of the saddle-shaped coil exposed on the screen side from the end surface on the screen side is increased, and the effect of increasing the heat dissipation area and the effect of heat convection improve the heat dissipation effect and suppress the temperature rise. Since it is possible, the wire forming the saddle-type coil does not need to be an expensive extra fine wire or a collective stranded wire, and disconnection of the wire in the coil winding step can be avoided.

[Brief description of the drawings]

FIG. 1 is a plan view of a cathode ray tube device according to a first embodiment of the present invention.

FIG. 2 is a side view of a cathode ray tube device according to a second embodiment of the present invention.

FIG. 3 is a diagram for explaining heat radiation due to heat convection;

FIG. 4 is a view showing the relationship between the surface area of a saddle-type horizontal coil portion exposed from the screen side end surface of a ferrite core of a deflection yoke to the screen side and the temperature rise of the saddle-type horizontal coil;

FIG. 5 is a diagram showing the relationship between the surface area of a saddle type vertical coil portion exposed from the screen side end surface of the ferrite core of the deflection yoke to the screen side and the temperature rise of the saddle type vertical coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; 10 Cathode ray tube main body 2: 11 Glass panel part 3: 12 Glass funnel part 4: 13 Saddle type horizontal coil 5; 14 Insulating frame 6; 15 Saddle type vertical coil 7; 16 Ferrite core 8; 17 Deflection yoke 9; 18 Screen side of ferrite core

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/76

Claims (2)

(57) [Claims] 1. A cathode ray tube main body having a glass panel and a glass funnel connected to a rear portion thereof, and an electron gun provided at a rear portion of the cathode ray tube main body, wherein the electron gun is disposed on a rear outer periphery of the cathode ray tube main body. , Saddle type horizontal coil,
A cathode ray tube device comprising a deflection yoke including an insulating frame provided outside thereof and a saddle type vertical coil and a ferrite core provided outside thereof, wherein the saddle type is provided.
Is the horizontal coil the end face of the ferrite core on the screen side?
Exposed on the screen side along the glass funnel.
Out to form a deflection magnetic field, dew of the saddle-type horizontal coil
Der surface area of 100cm ² more than 298cm ² or less of the out part
Cathode ray tube and wherein the that. 2. A cathode ray tube main body having a glass panel and a glass funnel connected to a rear portion thereof, and an electron gun provided at a rear portion of the cathode ray tube main body. , Saddle type horizontal coil,
A cathode ray tube device comprising a deflection yoke including an insulating frame provided outside thereof and a saddle type vertical coil and a ferrite core provided outside thereof, wherein the saddle type is provided.
Is the vertical coil the screen side end face of the ferrite core?
Exposed on the screen side along the glass funnel.
Out to form a deflection magnetic field, dew of the saddle type vertical coil
Cathode-ray tube apparatus according to claim <br/> surface area portion is 55cm ² or more 185cm ² or less out.