JPH1118100A - Color cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compensate beam mislanding with the temperature change of a color cathode-ray tube(CRT) by providing a correction circuit for controlling the direction and strength of a current which flows into a magnetic field generating coil, based on the output of a temperature sensor. SOLUTION: A 1st temperature sensor 11 is provided outside the side face of a panel 2, and a 2nd temperature sensor 12 is provided outside a funnel 3. A 1st 8-shaped magnetic field generating coil 13 surrounding the funnel 3 near two upside corner parts on the side of the panel 2 and a 2nd 8-shaped magnetic field generating coil 14 surrounding the funnel 3 near two downside corner parts on the side of the panel 2 are provided. Furthermore, a correction circuit 15 is provided for letting currents flow to the respective magnetic field generating coils 13 and 14, while determining the direction and the strength of currents which flow to the 1st and 2nd magnetic field generating coils 13 and 14, based on the outputs of the 1st and 2nd temperature sensors 11 and 12. Therefore, beam mislanding caused by the fluctuation of the temperature on the panel 2 and the funnel 3 is compensated automatically, and stable image quality can be kept.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube apparatus capable of reducing beam mislanding caused by a temperature change of a color cathode ray tube.

[0002]

FIG. 12 is a horizontal sectional view schematically showing a panel 2 and a part of a shadow mask 8 of a conventional color cathode ray tube device. In the color cathode ray tube device shown in the figure, an electron beam 7 from an electron gun (not shown) passes through a hole 8 a of a shadow mask 8 and is irradiated on a phosphor 4 a constituting the phosphor layer 4. .

[0003]

However, in the conventional color cathode ray tube device, when the temperature of the color cathode ray tube changes depending on the operating conditions such as the operating environment temperature of the device, mislanding of the electron beam 7 occurs and the color shift occurs. There has been a problem that may occur.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to compensate for a beam mislanding caused by a temperature change of a color cathode ray tube. A color cathode ray tube device is provided.

[0005]

According to a first aspect of the present invention, there is provided a color cathode ray tube apparatus comprising: a cathode ray tube having a panel having a phosphor and a funnel having an electron gun; A temperature sensor having a color selection electrode having a hole through which an electron beam passes, and detecting a temperature of the cathode ray tube; a magnetic field generating coil surrounding four corners of the funnel on the panel side; and the temperature sensor And a correction circuit for controlling the direction and intensity of the current flowing through the magnetic field generating coil based on the output of

A color cathode ray tube device according to claim 2 is
2. The apparatus according to claim 1, wherein the temperature sensor is provided on each of the panel and the funnel.

Further, the color cathode ray tube device according to claim 3 is
2. The apparatus according to claim 1, wherein said temperature sensor is provided on said panel.

Further, the color cathode ray tube device of claim 4 is
2. The apparatus according to claim 1, wherein said temperature sensor is provided on said funnel.

Further, the color cathode ray tube device of claim 5 is
5. The device according to claim 1, wherein said magnetic field generating coil is provided on an upper side of said funnel on said panel side.
A first figure-shaped first coil surrounding two corners, and a second figure-shaped second coil surrounding two lower corners on the panel side of the funnel. I have.

Further, the color cathode ray tube device of claim 6 is
The apparatus according to any one of claims 1 to 4, wherein the magnetic field generating coil includes first to fourth annular coils which respectively surround four corners of the funnel on the panel side.

[0011]

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

Embodiment 1 FIG. 1 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to Embodiment 1 of the present invention. FIG. 2 is a partially cutaway perspective view schematically showing the configuration of the color cathode ray tube shown in FIG.

As shown in FIGS. 1 and 2, the color cathode ray tube device of the first embodiment has a color cathode ray tube (hereinafter, referred to as “CRT”) 1. The CRT 1 has a panel 2 and a funnel 3 joined to the panel 2.

On the inner side of the image display surface of the panel 2, a phosphor layer 4 in which three kinds of phosphors 4a which emit red, green, and blue light upon irradiation with an electron beam 7 are arranged in a vertically long stripe shape. Is provided. In addition, funnel 3
An electron gun 6 that emits three electron beams 7 for red, green, and blue is provided in the neck 5. Also, CR
A shadow mask 8 as a color selection electrode having a large number of holes 8a for passing an electron beam 7 from an electron gun 6 is provided at a position in the T1 facing the phosphor layer 4.

As shown in FIG. 2, a deflection yoke 9 for deflecting the electron beam 7 up, down, left and right is arranged outside the funnel 3. Further, inside the funnel 3, an internal magnetic shield (hereinafter, referred to as “IMS”) 10 for magnetic shielding is provided.

Further, as shown in FIG. 1, the color cathode ray tube device of the first embodiment has a first temperature sensor 11 outside the side surface of the panel 2 and a first temperature sensor 11 outside the funnel 3. Two temperature sensors 12 are provided. Here, as the first and second temperature sensors 11 and 12, for example, a thermocouple, a thermistor, or the like can be used. The mounting position of the temperature sensor 11 is not limited to the illustrated position as long as the temperature of the panel 2 can be measured, and the number of the temperature sensors 11 may be plural. Furthermore, the mounting position of the temperature sensor 12 is not limited to the illustrated position as long as the temperature of the funnel 3 can be measured, and the number of the temperature sensors 12 may be plural.

Further, the color cathode ray tube device according to the first embodiment has a figure-shaped first magnetic field generating coil 13 surrounding the upper two corners on the panel 2 side of the funnel 3 and a panel of the funnel 3. And a second magnetic field generating coil 14 having a figure eight shape surrounding two lower corners on two sides. The first and second magnetic field generating coils 13 and 14 are formed by winding a conducting wire a plurality of times in the shape of a figure eight.

Further, the color cathode ray tube device according to the first embodiment is arranged such that the directions of the currents flowing through the first and second magnetic field generating coils 13 and 14 based on the outputs of the first and second temperature sensors 11 and 12 are different. And the strength of each magnetic field generating coil 13,
14 has a correction circuit 15 for flowing current.

FIG. 3 is an explanatory diagram showing a result of observing a beam mislanding accompanying a temperature change of the panel 2 with a scope (microscope). 4A and 4B are explanatory diagrams for explaining the principle in which the phenomenon shown in FIG. 3 occurs. FIG. 4A shows a horizontal cross section, and FIG. 4B shows a state in which the phosphor 4a and the electron beam 7 are viewed from the front of the panel 2. Is shown.

As shown in FIG. 3, when the temperature of panel 2 increases, beam mislanding in the H direction is observed, and when the temperature of panel 2 decreases, beam mislanding in the L direction is observed. Since FIG. 3 is a scope view, the relative deviation direction of the actual electron beam irradiation position is a direction opposite to the illustrated direction. That is, when the temperature of the panel 2 increases, the electron beam irradiation position based on the phosphor 4a shifts inward, and when the temperature of the panel 2 decreases, the electron beam irradiation position based on the phosphor 4a shifts outward.

The reason why the beam mislanding occurs due to the temperature change of the panel 2 is that the panel 2 is moved from the position indicated by the solid line to the position indicated by the broken line by the thermal expansion accompanying the temperature rise of the panel 2 as shown in FIG. Position and at the same time,
This is because the irradiation position of the electron beam 7 with respect to the phosphor 4a is relatively shifted as shown in FIG. 4B by shifting the phosphor 4a from the solid line position to the broken line position.

FIG. 5 is an explanatory diagram showing a result of observing a beam mislanding caused by a temperature change of the funnel 3 with a scope. 6A and 6B are explanatory diagrams for explaining the principle of the phenomenon of FIG. 5. FIG. 6A shows a horizontal section, and FIG. 6B shows a state in which the phosphor 4 a and the electron beam 7 are viewed from the front of the panel 2. Is shown.

As shown in FIG. 5, when the temperature of the funnel 3 rises, beam mislanding in the H direction is observed, and when the temperature of the funnel 3 falls, beam mislanding in the L direction is observed. FIG.
Is a scope view, the relative deviation direction of the actual electron beam irradiation position is opposite to the illustrated direction.
That is, when the temperature of the funnel 3 rises, the phosphor 4
The electron beam irradiation position with reference to a shifts outward, and when the temperature of the funnel 3 decreases, the electron beam irradiation position with reference to the phosphor 4a shifts inward.

FIG. 6A shows that the beam mislanding occurs due to the temperature change of the funnel 3 as described above.
As shown in (2), the temperature of the IMS 10 and the shadow mask 8 rises due to the thermal radiation accompanying the temperature rise of the funnel 3, and the shadow mask 8 expands outward from the thermal expansion (from the solid line position to the broken line position). The hole 8a is also shifted from the solid line position to the broken line position, as shown in FIG.
This is because the irradiation position of the electron beam 7 with respect to the phosphor 4a is relatively shifted as shown in FIG.

FIGS. 7A and 7B are explanatory diagrams showing the directions of currents flowing through the first and second magnetic field generating coils 13 and 14 by the correction circuit 15. FIG. ).

When it is desired to move the irradiation position of the electron beam 7 to the inside in the horizontal direction of the image display surface of the panel 2, FIG.
To generate the direction of the magnetic flux shown by the solid arrows B ₁ (a), the first and second magnetic field generating coil 13, 14
, Currents I ₁ and I ₂ in the directions indicated by dashed arrows flow. At this time, the intensity of the currents I ₁ and I ₂ is determined by the correction circuit 15 based on the outputs of the first and second temperature sensors 11 and 12. Conversely, when it is desired to move the irradiation position of the electron beam 7 in the horizontal direction outside the image display surface of panel 2, in order to generate the direction of the magnetic flux shown by the solid line arrow B ₂ in FIG. 7 (b) , First and second magnetic field generating coils 13, 1
4, currents I ₃ and I ₄ in the directions indicated by the dashed arrows flow. The intensity of the currents I ₃ and I ₄ at this time is determined by the correction circuit 15 based on the outputs of the first and second temperature sensors 11 and 12. More specifically, when the temperature of the panel 2 is low or the temperature of the funnel 3 is high, the correction circuit 15 supplies a current in the direction shown in FIG. Is high or the temperature of the funnel 3 is low, a current flows in the direction shown in FIG.

When the temperature of the panel 2 is low and the temperature of the funnel 3 is low, the beam mislanding caused by the temperature decrease of the panel 2 and the beam mislanding caused by the temperature decrease of the funnel 3 mutually. They act to cancel each other, but some beam mislanding remains. For this reason, even in such a case, the correction circuit 15 includes the first and second temperature sensors 11 and
Twelve outputs determine the direction and intensity of the current.
On the other hand, even when the temperature of the panel 2 is high and the temperature of the funnel 3 is high, the beam mislanding caused by the temperature rise of the panel 2 and the beam mislanding caused by the temperature rise of the funnel 3 cancel each other. But some beam mislanding remains. Therefore, even in such a case, the correction circuit 1
5 determines the direction and intensity of the current based on the outputs of the first and second temperature sensors 11 and 12. The correction circuit 1
The formulas for calculating the directions and intensities of the currents flowing through the first and second magnetic field generating coils 13 and 14 according to FIG. 5 differ depending on various conditions such as the structure, material, size, and use environment of the device. The correction circuit 1 is determined in advance on the basis of actual measurement values for each type of device or for each device.
5 must be entered. In addition, the correction circuit 15
If the current and the direction and the value of the current corresponding to the voltage value and the resistance value output from the temperature sensor can flow through the magnetic field generating coil, for example, the relationship between the detected voltage value and the current flowing through the coil is determined. The memory may have a stored memory, or may be operated each time based on the detected voltage value, or may have another configuration.

As described above, according to the color cathode ray tube apparatus of the first embodiment, the first and second magnetic field generating coils automatically apply the current of the direction and the strength based on the temperature of the panel 2 and the funnel 3. Since it flows through the channels 13 and 14, beam mislanding caused by fluctuations in the temperature of the panel 2 and the funnel 3 can be automatically compensated, and a stable image quality can be maintained at all times regardless of the use environment temperature and the like. .

Embodiment 2 FIG. 8 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to Embodiment 2 of the present invention.

In FIG. 8, the same or corresponding components as those shown in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 8, the color cathode ray tube device according to the second embodiment has only a first temperature sensor 11 for detecting the temperature of the panel 2, and based on the output of the first temperature sensor 11, The only difference from the first embodiment is that the direction and intensity of the current flowing through the first and second magnetic field generating coils 13 and 14 are determined. The configuration of the second embodiment is particularly effective to be applied to an apparatus in which the degree of beam mislanding due to the fluctuation in the temperature of the funnel 3 is small or to an apparatus in which the temperature fluctuation of the funnel 3 is small. Thus, the configuration of the device can be simplified.

The other points of the second embodiment are the same as those of the first embodiment.

Third Embodiment FIG. 9 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a third embodiment of the present invention.

In FIG. 9, the same or corresponding components as those shown in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 9, the color cathode ray tube device according to the third embodiment has only the second temperature sensor 12 for detecting the temperature of the funnel 3, and based on the output of the second temperature sensor 12, The only difference from the first embodiment is that the direction and intensity of the current flowing through the first and second magnetic field generating coils 13 and 14 are determined. The configuration of the third embodiment is particularly effective to be applied to an apparatus in which the degree of beam mislanding due to the fluctuation of the temperature of the panel 2 is small or an apparatus in which the temperature fluctuation of the panel 2 is small. The configuration can be simplified.

The other points of the third embodiment are the same as those of the first embodiment.

Fourth Embodiment FIG. 10 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a fourth embodiment of the present invention.

In FIG. 10, the same or corresponding components as those shown in FIG. 1 are denoted by the same reference numerals. As shown in FIG. 10, the color cathode ray tube device according to the fourth embodiment is different from the color cathode ray tube shown in FIG.
The third embodiment differs from the first embodiment only in that first to fourth annular magnetic field generating coils 16, 17, 18, and 19 respectively surround the four corners near the panel 2.

FIGS. 11A and 11B show the correction circuit 15.
The first to fourth annular magnetic field generating coils 16, 1
It is explanatory drawing which shows the direction of the electric current passed through 7,18,19, and shows the state which looked at CRT1 from the back side (electron gun side).

When it is desired to move the irradiation position of the electron beam 7 to the inside of the image display surface of the panel 2 in the horizontal direction, FIG.
In order to generate the direction of the magnetic flux shown by the solid arrows B ₁ (a), the first to fourth annular magnetic field generating coil 16,
Currents I ₁₁ , I ₁₂ , I ₁₃ , and I ₁₄ in directions indicated by dashed arrows flow through 17, 18, and 19, respectively. At this time, the intensity of the currents I ₁₁ , I ₁₂ , I ₁₃ and I ₁₄ is determined by the correction circuit 15 based on the outputs of the first and second temperature sensors 11 and 12. Conversely, when it is desired to move the irradiation position of the electron beam 7 to the outside in the horizontal direction of the image display surface of the panel 2, FIG.
In order to generate the magnetic flux in the direction indicated by the solid arrows B ₂ (b), the first to fourth annular magnetic field generating coil 16,
Currents I ₁₅ , I ₁₆ , I ₁₇ , and I ₁₈ in the directions indicated by broken lines in FIG. At this time, the intensity of the currents I ₁₅ , I ₁₆ , I ₁₇ , and I ₁₈ is determined by the correction circuit 15 based on the outputs of the first and second temperature sensors 11 and 12. According to the fourth embodiment, the same effect as in the first embodiment can be obtained.

In the fourth embodiment, the other points are the same as those in the first embodiment.

The annular magnetic field generating coils 16, 17, 18, and 19 of the fourth embodiment can be applied in place of the figure-eight magnetic field generating coils 13 and 14 of the second or third embodiment. .

Further, the shape and the mounting position of the magnetic field generating coil are not limited to those described above, and any other shapes and positions can be used as long as they can generate the magnetic flux B ₁ and the magnetic flux B _2. It may be arranged at another position.

[0042]

As described above, according to the first aspect of the present invention, a current having a direction and intensity based on the temperature of the cathode ray tube is automatically supplied to the magnetic field generating coil. Beam mislanding caused can be automatically compensated, and the effect of constantly maintaining stable image quality can be obtained.

According to the second aspect of the present invention, a current having a direction and a strength based on the temperature of the panel and the funnel is automatically applied to the magnetic field generating coil, so that the beam mislanding caused by the temperature fluctuation of the panel and the funnel. Can be automatically compensated, and the effect that a stable image quality can be always maintained can be obtained.

According to the third aspect of the present invention, since the beam mislanding is automatically compensated based only on the temperature of the panel, the device or the funnel having a small degree of beam mislanding due to the temperature fluctuation of the funnel. If the present invention is applied to an apparatus having a small temperature fluctuation, the effect that the configuration of the apparatus can be simplified can be obtained.

According to the fourth aspect of the present invention, since the beam mislanding is automatically compensated based only on the temperature of the funnel, an apparatus or a panel having a small degree of beam mislanding due to the temperature fluctuation of the panel. If the present invention is applied to a device having a small temperature fluctuation, the effect that the configuration of the device can be simplified can be obtained.

According to the fifth aspect of the present invention, beam mislanding can be compensated for by two coils having a figure eight shape, so that the effect of simplifying the configuration of the device can be obtained.

According to the invention of claim 6, beam mislanding can be compensated by the first to fourth annular coils respectively surrounding the four corners of the funnel, thereby simplifying the configuration of the apparatus. The effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view schematically showing a configuration of the color cathode ray tube shown in FIG.

FIG. 3 is an explanatory diagram showing a result of observing a beam mislanding caused by a temperature change of a panel with a scope.

FIG. 4 is an explanatory diagram for explaining a principle in which the phenomenon in FIG. 3 occurs.

FIG. 5 is an explanatory diagram showing a result of observing a beam mislanding due to a temperature change of a funnel with a scope.

FIG. 6 is an explanatory diagram for explaining a principle in which the phenomenon in FIG. 5 occurs.

FIG. 7 is an explanatory diagram illustrating directions of currents flowing through the first and second magnetic field generating coils by the correction circuit according to the first embodiment.

FIG. 8 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a second embodiment of the present invention.

FIG. 9 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a third embodiment of the present invention.

FIG. 10 is a configuration diagram schematically showing a configuration of a color cathode ray tube device according to a fourth embodiment of the present invention.

FIG. 11 is an explanatory diagram illustrating directions of currents flowing through first to fourth annular magnetic field generating coils by the correction circuit according to the fourth embodiment;

FIG. 12 is a horizontal sectional view schematically showing a part of a panel and a shadow mask of a conventional color cathode ray tube device.

[Explanation of symbols]

1 CRT, 2 panels, 3 funnels, 4
Phosphor layer, 4a phosphor, 5 neck, 6 electron gun, 7 electron beam, 8 shadow mask, 8a
Hole, 9 deflection yoke, 10 IMS, 11 first temperature sensor, 12 second temperature sensor, 13
1st magnetic field generating coil, 14 2nd magnetic field generating coil, 15 correction circuit, 16 1st annular magnetic field generating coil, 17 2nd annular magnetic field generating coil, 18 3rd annular magnetic field generating coil, 19th Annular magnetic field generating coil.

Claims (6)

[Claims] 1. A cathode ray tube having a panel provided with a phosphor and a funnel provided with an electron gun, and a color selection electrode provided in the cathode ray tube and having a hole for passing an electron beam from the electron gun. In the color cathode ray tube device, a temperature sensor for detecting a temperature of the cathode ray tube; a magnetic field generating coil surrounding four corners on the panel side of the funnel; and a magnetic field generating coil based on an output of the temperature sensor. A color cathode ray tube device comprising: a correction circuit for controlling a direction and intensity of a flowing current. 2. The color cathode ray tube device according to claim 1, wherein said temperature sensor is provided on each of said panel and said funnel. 3. The color cathode ray tube device according to claim 1, wherein the temperature sensor is provided on the panel. 4. The color cathode ray tube device according to claim 1, wherein said temperature sensor is provided on said funnel. 5. A first figure-shaped coil surrounding the upper two corners of the funnel on the panel side, and two lower coils on the panel side of the funnel. The color cathode ray tube device according to any one of claims 1 to 4, further comprising a figure-shaped second coil surrounding a corner. 6. The coil according to claim 1, wherein the magnetic field generating coil has first to fourth annular coils which respectively surround four corners of the funnel on the panel side.
A color cathode ray tube device according to any one of claims 1 to 4.