JPH06243793A - Member for supporting member for corner supporting color selection mask of cathode ray tube - Google Patents

Abstract

PURPOSE:To install a corner supporting color selection mask supporting member inside a cathode ray tube without making any dent in a corner part by installing a material, which has two faces making the specific angle with each other, to a frame side part or an arm part, of a color selection mask in a spring holder of a supporting member. CONSTITUTION:A supporting member 15 is formed by welding a color selection mask fixing spring 3 onto a fixing face 14a of a spring holder 14. A mask adhesion face 14b of the holder 14 is welded to a frame side part 12A of the color selection mask 12. In this way, an engaging hole 3a of the spring 3 is engaged with a pin provided in a comer part, inside a cathode ray tube, so that the mask 12 can be fixed inside the cathode ray tube without making any dent in the corner part. The comer supporting color selection mask can be also used for a cathode ray tube, in which any dent cannot be made in the corner part because tension needs applying to the mask, and a temperature drift can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support member for mounting a corner support color selection mask on a cathode ray tube.

[0002]

2. Description of the Related Art Generally, a cathode ray tube used for a color television is provided with a color selection mask such as a shadow mask inside. As the form of the color selection mask,
For example, if the cathode ray tube is a shadow mask tube,
As shown in Japanese Utility Model Publication No. 2-148553, Japanese Examined Patent Publication No. 3-61978, etc., usually, as shown in FIG. 4, the corner portion of the color selection mask 2 mounted in the cathode ray tube 1 is recessed, and The color selection mask fixing spring 3 having the engagement hole 3a opened is welded, and a pin (not shown) provided on the inner wall of the cathode ray tube 1 is engaged with the engagement hole 3a of the color selection mask fixing spring. This is what is used (corner support color selection mask). In this way, when mounting the color selection mask 2 inside the cathode ray tube 1,
By supporting the color selection mask 2 at the corner portion of the cathode ray tube 1, it is possible to prevent the color shift with respect to the temperature of the cathode ray tube.

However, in a cathode ray tube using a vertical slit-shaped color selection mask, such as a Trinitron tube,
It is easy to cause color shift due to resonance at a specific frequency, and it is necessary to apply tension (turnbuckle) to the color selection mask to prevent such color shift. Can not. Therefore, as shown in FIG. 5, a color in which the supporting member 5 in which the color selection mask fixing spring 3 is welded to the flat plate-shaped spring holder 4 is attached to each of the frame side portion 2A and the arm portion 2B of the color selection mask 2 is shown. A selection mask 2 (on-axis support color selection mask) is used.

[0004]

However, when the on-axis supporting color selection mask is used, the landing of the electron beam at the corner portion becomes unstable, and the landing position of the electron beam shifts as the temperature of the cathode ray tube rises. The problem of temperature drift arises. For example, as shown in FIG. 6, the deviation amount of the electron beam from 0 to 5 minutes is about 10 μm in a normal shadow mask tube equipped with a corner support color selection mask, whereas the axial support color selection is performed. With a Trinitron tube equipped with a mask, it becomes about 30 μm. Further, in the Trinitron tube provided with the on-axis support color selection mask, the temperature drift is not only large in quantity but also includes the rotation component as shown in the temperature drift pattern of 0 to 5 minutes shown in FIG. 7B. There is also a problem that it is not easy to correct the drift.

The present invention is intended to solve the above problems of the prior art, and a corner supporting color can be applied to a cathode ray tube, such as a trinitron tube, which conventionally cannot be provided with a corner supporting color selecting mask. A screening mask is provided so that the landing of the electron beam at the corner portion of the cathode ray tube is stabilized and the temperature drift of the cathode ray tube is improved.

[0006]

SUMMARY OF THE INVENTION The inventor of the present invention has proposed a spring holder constituting a supporting member for attaching a color selection mask to a cathode ray tube, without using a flat plate-shaped spring holder. It has been found that it becomes possible to support the color selection mask at the corners by using a spring holder having such a structure and attaching such a spring holder to the frame side portion or the arm portion of the color selection mask, and completed the present invention. .

That is, according to the present invention, the color selection mask is provided inside the cathode ray tube by engaging the engagement hole of the spring for fixing the color selection mask having the engagement hole with the pin provided inside the cathode ray tube. A spring holder for fixing the color selection mask used for mounting, wherein the spring holder is attached to the frame side or arm of the color selection mask, the spring holder being attached to the frame side or arm of the color selection mask. A mask fixing surface that is in close contact, and a spring fixing surface whose normal line overlaps with the center line of the pin provided in the corner of the cathode ray tube when the mask contacting surface is in close contact with the frame side or arm of the color selection mask. There is provided a spring holder having:

Further, according to the invention, a color selection mask fixing spring having an engaging hole is joined to the spring fixing surface of the spring holder, and a corner supporting color selection mask support for a cathode ray tube is provided. Provide a member.

[0009]

According to the spring holder of the present invention, when the mask contact surface is brought into close contact with the frame side portion or the arm portion of the color selection mask, and the mask contact surface is brought into close contact with the frame side portion or the arm portion of the color selection mask, Since there is a spring fixing surface whose normal line overlaps the center line of the pin provided at the corner portion of the cathode ray tube, the spring fixing surface is joined with a spring for fixing a color selection mask having an engaging hole. By using the member, the corner supporting color selection mask can be configured without denting the corner portion. That is, a color selection mask fixing spring having an engaging hole is joined to the spring fixing surface of the spring holder of the present invention, and the mask contact surface is brought into close contact with the frame side portion or arm portion of the color selection mask to perform color selection. It is possible to fix the color selection mask in the cathode ray tube by engaging the engaging holes of the mask fixing spring with the pins provided at the corners of the cathode ray tube.

In this case, it is not necessary to indent the corner portion of the color selection mask. Therefore, unlike the Trinitron tube, it is necessary to apply tension to the color selection mask so that the corners cannot be recessed, and therefore the corner support color selection is not possible for the cathode ray tube where the conventional corner support color selection mask could not be provided. It becomes possible to provide a mask.

As described above, by providing the corner support color selection mask on the cathode ray tube using the support member of the present invention, the temperature drift of the cathode ray tube is reduced as compared with the case where the axial support color selection mask is provided. Also, the landing position of the electron beam at the corner of the cathode ray tube is stabilized. Also, the resonance point in the normal range of the cathode ray tube decreases,
The frame vibration mode is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. In addition, in each of the drawings, including the above-mentioned conventional example, the same reference numerals represent the same or equivalent constituent elements.

FIG. 3 is a perspective view of the spring holder 14 of the embodiment, and FIG. 1 is a perspective view of the corner support color selection mask 12 formed by using the spring holder 14.

As shown in FIG. 3, the spring holder 14 is not flat and has a spring fixing surface 14a and a mask contact surface 14b having a predetermined angle θ. The angle θ between these two surfaces is such that when the mask contact surface 14b is brought into close contact with the frame side portion 2A of the color selection mask, the normal line x of the spring fixing surface 14a is equal to that of the pin provided at the corner portion of the cathode ray tube. The angle is such that it overlaps the center line. It should be noted that such a spring holder can be produced, for example, by cutting a stainless plate into a predetermined shape by a conventional method and bending it.

FIG. 1 shows such a spring holder 1
4, the color fixing mask fixing spring 3 is first welded to the spring fixing surface 14a to form the supporting member 15 of the present invention, and then the mask contact surface 14b of the spring holder 14 is changed to the color selecting mask 12. Frame side 12A
Welded to. The engaging hole 3a of the spring 3 for fixing the color selection mask of the color selection mask 12 thus obtained
Engages with a pin provided at a corner portion inside the cathode ray tube, whereby the color selection mask 12 can be fixed in the cathode ray tube. Therefore, this color selection mask 12 becomes a corner support color selection mask.
Further, in this case, as is clear from the figure, the corner portion of the color selection mask 12 is not recessed. Therefore, such a color selection mask 12 can also be configured as a corner support color selection mask for a Trinitron tube.

FIG. 2 is a perspective view of the corner support color selection mask 12 formed by using the same support member 15 as in FIG. 1 and welding the mask contact surface of the spring holder 14 to the arm portion 12B of the color selection mask. It is a figure. As described above, the support member 15 of the present invention is provided with the spring holder 14
The mask contact surface may be joined to the arm portion 12B of the color selection mask. In this case, the angle between the mask contact surface of the spring holder and the spring fixing surface is such that when the mask contact surface is brought into close contact with the arm portion 12B of the color selection mask, the normal line x of the spring fixing surface is the corner portion of the cathode ray tube. The angle should be set appropriately so as to overlap with the center line of the pin provided on the.

In the corner supporting color selecting mask using the spring holder of the present invention as described above, the structure of the color selecting mask fixing spring 3 itself used is the same as that of the conventional general shadow mask tube shown in FIG. It can be similar to the corner support color selection mask, and can be composed of a leaf spring made of stainless steel, for example. Also,
The configuration of the pin itself provided inside the cathode ray tube for engaging with the engagement hole 3a of the color selection mask fixing spring 3 is also the corner support color selection of the conventional general shadow mask tube shown in FIG. It can be similar to a mask.

FIG. 6 shows the relationship of the beam deviation amount of a Trinitron tube equipped with a corner supporting color selection mask using the spring holder of the present invention with respect to time. As described above, by using the spring holder of the present invention to attach the corner support color selection mask to the Trinitron tube, the electron beam of 0 to 5 minutes can be generated compared to the conventional Trinitron tube having the axial support color selection mask. The amount of deviation can be significantly reduced.

FIG. 7A shows a pattern of temperature drift of 0 to 5 minutes of a Trinitron tube equipped with a corner supporting color selection mask using the spring holder of the present invention. As described above, by using the spring holder of the present invention to attach the corner supporting color selection mask to the Trinitron tube, the electron beam of the electron beam can be generated as compared with the conventional Trinitron tube having the on-axis supporting color selection mask (FIG. 7B). The amount of deviation can be significantly reduced, and this temperature drift can be free of rotational components. Therefore, it is understood that the temperature drift can be corrected by appropriately adjusting the shape of the spring holder of the present invention, the mounting position for the color selection mask, and the like.

The reason why the Trinitron tube equipped with the corner supporting color selecting mask using the spring holder of the present invention shows the temperature drift pattern as shown in FIG. 7 is considered as follows. That is,
Generally, since the trinitron tube has a small heat capacity in the minor axis direction, the lattice member of the color selection mask initially extends in the minor axis direction,
As a result, the tension (turnbuckle) applied to the color selection mask decreases, and the curvature Rz of the frame side approaches the case where no tension is applied. Such a decrease in tension applied to the color selection mask and a change in curvature Rz are caused by the conventional trinitron tube provided with the on-axis supporting color selection mask, and the color selection mask and the panel at the corners of the trinitron tube. It appears as a change in the distance from the inner surface (aperture grille height: GH) and causes drift. On the other hand, in the Trinitron tube provided with the corner support color selection mask, the decrease in tension applied to the color selection mask is absorbed as the deformation of the arm of the color selection mask. Therefore, GH
This means that there will be almost no change in. Therefore, the drift amount is reduced.

When the corner support color selection mask is attached to the Trinitron tube using the spring holder of the present invention, not only the temperature drift is reduced as described above, but also the excitation point of the frame of the color selection mask is changed. However, the number of resonance points in the normal range is reduced. For example, in a conventional trinitron tube provided with an on-axis supporting color selection mask,
The four resonance points can be reduced to one or two. Therefore, the frame vibration mode is improved.

[0022]

According to the present invention, the corner support color selection mask supported by the pins provided at the corners of the cathode ray tube can be attached to various cathode ray tubes without denting the corners. As compared with the case where the on-axis supporting color selection mask is attached, the landing of the electron beam at the corner portion of the cathode ray tube can be stabilized and the temperature drift can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a corner support color selection mask using a spring holder of the present invention.

FIG. 2 is a perspective view of a corner support color selection mask using a spring holder according to another aspect of the present invention.

FIG. 3 is a perspective view of a spring holder of the present invention.

FIG. 4 is a partially cutaway perspective view of a cathode ray tube having a conventional corner supporting color selection mask.

FIG. 5 is a perspective view of a conventional on-axis support color selection mask.

FIG. 6 is a diagram showing the relationship between the shift amount of an electron beam and time in a cathode ray tube having various color selection masks.

FIG. 7 is a temperature drift pattern of a Trinitron tube having a corner support color selection mask using the spring holder of the present invention (FIG. 7A) and a temperature drift pattern of a Trinitron tube having a conventional on-axis support color selection mask. (B in the same figure).

[Explanation of symbols]

1 Cathode Ray Tube 2 Color Selection Mask 2A Color Selection Mask Frame Side 2B Color Selection Mask Arm 3 Color Selection Mask Fixing Spring 3a Color Selection Mask Fixing Spring Engagement Hole 4 Spring Holder 5 Supporting Member 12 Color selection mask 12A Frame side of the color selection mask of the embodiment 12B Arm of the color selection mask of the embodiment 14 Spring holder 14a of the embodiment Spring fixing surface of the spring holder of the embodiment 14b Mask contact surface of the spring holder of the embodiment 15 Supporting member of Example

Claims (2)

[Claims] 1. Use for mounting a color selection mask inside a cathode ray tube by engaging the engagement hole of a color selection mask fixing spring having an engagement hole with a pin provided inside the cathode ray tube. A spring holder for fixing the color selection mask, wherein the spring holder is attached to the frame side portion or arm portion of the color selection mask, and the spring holder is closely attached to the frame side portion or arm portion of the color selection mask. And a spring fixing surface whose normal line overlaps with the center line of the pin provided at the corner portion of the cathode ray tube when the mask contact surface is brought into close contact with the frame side portion or the arm portion of the color selection mask. Characteristic spring holder. 2. A support member for a corner selection color selection mask of a cathode ray tube, wherein a color selection mask fixing spring having an engaging hole is joined to a spring fixing surface of the spring holder according to claim 1.