JPS6042445Y2 - color cathode ray tube device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a color cathode ray tube device.

A conventional color cathode ray tube device is constructed as shown in FIG.

That is, the color cathode ray tube 1 has a panel 2 which is an image projection part having a fluorescent film (not shown) on the inner surface, a funnel 3 having an approximately 81-shape shape connected to the panel 2, and a funnel 3 connected to the funnel 3. A neck portion 4 made of a glass cylinder, an electron gun 5 that generates a plurality of electron beams enclosed in the neck portion 4, a base 6 that is a terminal for supplying various voltages to operate the electron gun 5, etc. It consists of

When operating such a cathode ray tube 1, it is necessary to attach a deflection yoke 7 and a neck magnet, that is, a convergence spirit correction device 8 to the neck portion 4.

In this case, the deflection yoke 7 is connected to the electron beam (
This is an electromagnetic deflection device for deflecting the light (not shown) in the horizontal and vertical directions and directing it to the required part of the fluorescent film formed on the inner surface of the panel 2. It is generally installed near the joint between the funnel 3 and the neck part 4. It is something that

In addition, the convergence spirit correction device 8 corrects the convergence spirit correction device 8 to compensate for the pollution or static in the center of the screen that is caused by assembly errors during the manufacturing of the color cathode ray tube 1, unnecessary external magnetic fields that exist in the place where the color cathode ray tube 1 is operated, and usually due to the influence of the earth's magnetic field. It is used to magnetically correct convergence deviations, and generally consists of a combination of a plurality of plate-shaped ring-shaped magnets 9 magnetized in a special pattern, and is held in place by an appropriate retaining ring 10. It is adapted to be attached to the neck portion 4.

By the way, the number of ring-shaped magnets 9 is 6 in a normal color cathode ray tube in which three electron guns are arranged in a row.
Two of these generate a magnetic field that commonly angles the three electron beams at a certain angle, and the other two generate a magnetic field that deflects the two electron beams on either side of the three electron beams. It generates a magnetic field that bends the electron beams by the same amount in opposite directions, and the remaining two are magnetized to generate magnetic fields that bend the two electron beams on either side of the three electron beams by the same amount in the same direction. ing.

Each pair of ring-shaped magnets 9 bends the electron beam by adjusting the mutual angle around the neck portion 4 and the rotation direction of the pair of ring-shaped magnets 9 relative to the color cathode ray tube 1. The size and direction of the magnets 9 can be arbitrarily obtained, and the desired correction can be made by adjusting the mounting angles (directions) of all six ring-shaped magnets 9.

In this case, the above correction amount, that is, the correction direction, is determined by actually attaching the deflection yoke 7 and the convergence spirit correction device 8 to the color cathode ray tube 1, and operating these to obtain the best result while viewing the projected screen. It is determined by actual inspection, and each ring-shaped magnet 9 of the convergence spirit correction device 8 is usually fixed at its best position.

However, such work requires skill and is difficult to automate, which is one of the causes of increased costs of color cathode ray tube devices.

For this reason, in recent years, the convergence spirit correction device 8 has been made of a magnetic material, for example, a sheet of magnetic material, and it is attached depending on the state of the screen, that is, the state of the error to be corrected. Magnetic materials have come to be used.

This magnetic body may be composed of a ring-shaped magnetic material.

FIG. 2 is a side view showing this type of color cathode ray tube device, in which reference numeral 11 denotes a magnetic material constituting the convergence spirit correction device 8, in this case a magnetic sheet made of a single sheet of magnetic material. be.

In this case, the magnetic sheet 11 can be provided either inside or outside the neck portion 4, but here, a magnetic sheet 11 wound around the outer surface of the neck portion 4 is exemplified.

Other parts are the same as in FIG.

By the way, the magnetic material forming the magnetic sheet 11 is generally a magnetic metal plate or a plastic magnetic material (
This is made by mixing a magnetic material such as barium ferrite into plastic), and after wrapping and fixing it around the neck part 4 by an appropriate method, or after providing it inside the neck part 4, The convergence spirit correcting device 8 is obtained by appropriately magnetizing the convergence spirit correcting device 8 by a magnetizing machine in a partially required direction depending on the amount of correction.

According to the convergence spirit correction device 8 using such a magnetic material (magnetic sheet 11), the state of the screen is electrically measured, the required magnetization distribution is calculated from the result, and the magnetization is adjusted accordingly. Since it becomes possible to operate the magnetic machine automatically, the above-mentioned problem of difficulty in automation can be solved, and furthermore, materials can be saved.

However, in a color cathode ray tube device in which the convergence spirit correction device 8 is constructed using a simply magnetic material, in the above embodiment, the magnetic sheet 11 is magnetized, the magnetic material (magnetic sheet 11) is once magnetized. Then, there is a major drawback in that subsequent fine adjustments (corrections) cannot be made, and in particular, it is impossible to improve the accuracy of static convergence.

In other words, even if it can be completely corrected at the time of magnetization, static correction may occur as a result of subsequent aging processes, or when it is incorporated into a television receiver and the focus voltage setting is different from that at the time of magnetization. The problem is that there is a shift in convergence.

In this regard, the color cathode ray tube device shown in FIG. 1 allows for readjustment, but in this case there is a problem in terms of cost as described above.

This idea was made in view of the above-mentioned circumstances.
It is an object of the present invention to provide a color cathode ray tube device which uses a method of configuring a convergence spirit correction device by magnetizing a magnetic material, and which can correct deviations in static convergence after magnetization extremely easily and at low cost. purpose.

Embodiments of this invention will be described below with reference to FIGS. 3 to 5.

FIG. 3 is a side view showing the main parts of an embodiment of a color cathode ray tube device according to this invention, and FIG.
A large cross-sectional view taken along the line A'. In both figures, 4 is the neck of the color cathode ray tube, 8 is a convergence spirit correction device mainly composed of a magnetic sheet and a minute magnet, which will be described later, and 11 is the inside of this neck 4 or A magnetic material provided externally, here a magnetic sheet made of a sheet-like magnetic material wound around the neck portion 4, 13 indicates a neck when a magnetic material (magnetic sheet 11) is provided inside the neck portion 4. It is a minute magnet provided at an appropriate position on the portion 4 or, when provided outside the neck portion 4, at an appropriate position on the magnetic body.

In this case, the micro magnet 13 may be, for example, a curved rectangular sheet magnet with S and N poles formed in the vertical direction as shown in FIG. A normal ferrite magnet or the like with an N pole formed thereon is used.

That is, in this invention, after the magnetic sheet 11 is once magnetized, it is incorporated into, for example, a television receiver;
When a shift in static convergence occurs for some reason, such as the focus voltage setting being different from the time of magnetization, while observing the shift in convergence at the center of the color cathode ray tube screen, for example, as shown in Figure 5 a and b, Such a minute magnet 13 is attached to the neck portion 4 by pasting or the like at an appropriate position, size, or strength of magnetic force that matches the convergence at the center.

As a result, as shown by the arrow in FIG.
The weak magnetic field of the micro magnet 13 is superimposed on the magnetic field of the micro magnet 13 to perform fine correction.The work is partial and the amount of correction is small, that is, it is a fine correction, so it can be easily and inexpensively done. I can do it.

In addition, in the illustrated embodiment, the case where one micro magnet 13 is used is illustrated, but it is not limited to this, and two micro magnets 13 are used.
It goes without saying that more than one sheet may be used.

As described above, according to this invention, in a convergence spirit correction device using a magnetic material magnetization force, in which fine correction of convergence was not possible, a small magnet is appropriately provided on the neck part or on the magnetic material. Therefore, although it is a magnetic material magnetization method, it is possible to easily and at low cost make fine corrections to the convergence, and this has the effect of greatly contributing to improving the performance of television receivers and having great practical value.

[Brief explanation of the drawing]

1 and 2 are side views of a conventional color cathode ray tube device, FIG. 3 is a side view showing essential parts of an embodiment of the color cathode ray tube device according to this invention, and FIG. 4 is a line A-A in FIG. 3. 5A and 5B are perspective views showing an example of the structure of the micro magnet of the apparatus of the present invention shown in FIG. 3, respectively. 4...Neck part, butt...Convergence spirit correction device, 11...Magnetic sheet (magnetic material), 13...Minute magnet, shown in the figure The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a color cathode ray tube device configured to correct at least static convergence by suitably magnetizing a magnetic body provided on the neck of the color cathode ray tube, the above correction can be achieved by appropriately providing a minute magnet on the neck or the magnetic body. A color cathode ray tube device characterized in that a convergence shift that is not corrected by a magnetized magnetic material is corrected.