JPH0644919A - Shadow mask body structure - Google Patents

Abstract

PURPOSE:To restrain the deterioration of color purity related to deformation due to an impact and vibration energy. CONSTITUTION:An annular horizontal bead 11 is provided on a frame flange section 3b roughly along the opening shape 3c thereof, and vertical beads 12 derived from a plurality of positions on the bead 11 are extended to a frame skirt section 3a. The torsional strength of a frame 3 and the strength thereof against tripping deformation are thereby improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame used in a shadow mask structure of a shadow mask type color cathode ray tube.

[0002]

2. Description of the Related Art As shown in FIG. 4, a shadow mask structure 1 has a shadow mask body 2 having a large number of pores 2a and a mask skirt portion 2b formed on the periphery thereof.
A frame 3 having a frame skirt portion 3a, which is a fixed side wall for fixing the mask skirt portion 2b, and an annular frame flange portion 3b continuously provided at a right angle to the end of the frame skirt portion 3a; A spring 6 fixed to the frame skirt portion 3a and attached to a panel pin 5 provided on the inner surface of the panel 4 is provided.

Here, the shadow mask body 2 has a large number of pores 2a formed by a chemical etching method,
0.1 mm to 0.28 mm thick iron plate or 36% N
Invar material, which is an iron-containing material, is pressed into a panel 1
It is drawn into a curved surface similar to the shape. The frame 3 is formed by stamping and drawing a cold or hot rolled steel plate having a plate thickness of 0.8 mm to 2.0 mm.

In the color cathode ray tube, the electron beams 8R, 8G, 8B corresponding to the red (R), green (G) and blue (B) emitted from the electron gun 7 are deflected by the deflection yoke 9 to produce shadows. The fluorescent screen 1 passes through the pores 2a of the mask body 2.
When it reaches 0, the red (R), green (G), and blue (B) phosphors on the phosphor screen 10 are caused to emit light. At this time, the shadow mask structure 1 is attached to the panel 4 so that the electron beams 8R, 8G, and 8B passing through the pores 2a reach the phosphor screen 10 correctly as shown in FIG.

However, due to a handling error during the manufacture of the CRT and an impact force during transportation after the completion of the CRT, the shadow mask main body 2 fixed to the frame 3 is deformed due to the deformation of the frame 3 of the shadow mask structure 1, and FIG. When the position of the fine hole 2a of the shadow mask body 2 is shifted to the position Y deviating from the regular position X as shown in FIG. 5, the trajectory of the electron beam 8 reaching the fluorescent screen 10 through the fine hole 2a is also 8X. To 8Y, the phosphor screen 10 cannot be emitted correctly, and the color purity of the color cathode ray tube is reduced.

Also, by mounting the CRT on the TV set,
When the speaker volume of the set is increased, the vibration energy of the speaker is transmitted to the CRT, and the vibration is transmitted to the shadow mask structure 1 inside the CRT. At this time, when the frame 3 vibrates due to resonance, the shadow mask body 2 fixed to the frame 3 also vibrates, and vibrates as shown in FIG. Therefore, similarly to the case shown in FIG. 5, the positions of the pores 2a of the shadow mask body 2 are shifted from X to Y due to the vibration, so that the color purity is lowered.

The conventional frame 3 has a frame skirt portion 3
The structure shown in FIG. 7 in which a and the frame flange portion 3b are orthogonal to the L-shape is shown in FIG.
It was found from an experiment such as strobing that a vibration test is likely to cause a twisting deformation as shown in FIG. 8A and a frame tilting deformation as shown in FIG. 8B.

[0008]

Since the strength of the frame 3 is not sufficient in the conventional shadow mask structure as described above, in a color CRT having such a shadow mask structure 1 mounted, handling mistakes during CRT manufacturing and If a shock is applied during the transportation of the completed CRT, the frame 3 is deformed, and the shadow mask main body 2 fixed to the frame 3 is deformed. In addition, when the CRT is mounted on a TV set, the vibration generated when the speaker sounds is transmitted to the CRT, the frame 3 resonates, and the shadow mask main body 2 fixed to the frame vibrates. In this way, the shadow mask body 2
When is deformed or vibrated, the relative positional relationship between the panel 4 and the shadow mask structure 1 is changed, and the color purity is deteriorated as described above. This deformation of the frame 3 is especially
Becomes larger, and the thinner it becomes, the more remarkable it becomes.

The present invention has been made to solve the above problems, and has a sufficient strength that a vertical and horizontal bead complements each other by impact force or vibration energy and the frame is not easily deformed. The purpose is to get the structure.

[0010]

A shadow mask structure according to the present invention is a horizontal bead having a U-shaped cross section formed annularly or intermittently along the opening shape on the bottom surface of a frame flange portion, and this horizontal bead. It further has a vertical bead having a U-shaped cross section formed from the bottom surface of the frame flange portion to the frame skirt portion.

[0011]

According to the present invention, since the vertical bead formed by connecting with the annular or intermittent horizontal bead that follows the opening shape of the frame flange extends to the frame skirt, the frame strength is improved and the CRT manufacturing process is performed. The shadow mask is not deformed by the handling error in the middle or the impact force in the middle of transportation after the completion of the CRT, and the deformation of the shadow mask is also prevented. Further, the vibration amount transmitted to the CRT when the CRT is mounted on the TV set and the speaker is sounded, the amplitude amount due to the resonance of the frame can be suppressed, and the amplitude amount of the shadow mask fixed to this can be suppressed.

[0012]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a frame, and FIG. 2 is a cross-sectional view of a bead. In the figure, 11 is a horizontal bead having a U-shaped cross section provided annularly on the frame flange 3b substantially along the opening shape 3c of the frame flange 3b, and 12 is a frame flange derived from a plurality of positions of the horizontal bead 11. A vertical bead having a U-shaped cross section that crosses the portion 3b and extends to the frame skirt portion 3a.

In this way, the frame 3 has vertical and horizontal beads 11,
By providing 12, the frame strength is improved, and the shadow mask body is prevented from being deformed by the handling error during the CRT manufacturing process or the impact force during the transportation after the completion of the CRT, and the deformation of the shadow mask body is prevented. In addition, the vibration amount transmitted to the CRT when the CRT is mounted on a TV set and the speaker is sounded can suppress the amplitude amount due to the resonance of the frame and the amplitude amount of the shadow mask main body fixed to this.

In particular, the horizontal bead 11 along the opening shape 3c of the frame flange 3b is effective in twisting and deforming the frame 3, and the vertical bead 12 derived from the horizontal bead 11 and extending to the frame skirt 3a is formed. The frame skirt portion 3a is effective against the falling deformation, and both beads 11,
By connecting 12 complementarily, the strength of the frame 3 against shock and vibration can be dramatically improved.

Example 2. As shown in FIG. 3, a horizontal bead 11
The same effect as that of the above-described embodiment can be obtained by discontinuously providing the vertical bead 12 and widening the frame skirt portion 3a of the vertical bead 12.

[0016]

As described above, according to the present invention, since the vertical and horizontal beads can complement each other and have sufficient strength in the frame, even if a shock is applied during handling or transportation during CRT manufacturing, Or even if it is mounted on a TV set and the vibration due to the speaker volume is transmitted to the shadow mask,
The deformation of the shadow mask can be suppressed. For this reason, the positional relationship between the panel fluorescent screen and the shadow mask is maintained, so that there is an effect that a color cathode ray tube with less deterioration in color purity can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a shadow mask frame according to a first embodiment of the present invention.

2 is a sectional view of the bead of FIG. 1. FIG.

FIG. 3 is a diagram of a shadow mask frame showing a second embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the color cathode ray tube.

5 is a diagram showing a relationship between deformation of the shadow mask structure of FIG. 4 and deterioration of color purity.

FIG. 6 is a diagram showing a relationship between vibration of the shadow mask structure of FIG. 4 and deterioration of color purity.

FIG. 7 is a diagram showing the shadow mask frame of FIG. 4;

FIG. 8 is a schematic modification view of the shadow mask frame of FIG.

[Explanation of symbols]

 2 Shadow mask body 2a Pore 2b Mask skirt part 3 Frame 3a Frame skirt part 3b Frame flange part 3c Open shape 4 Panel 5 Panel pin 6 Spring 11 Horizontal bead 12 Vertical bead

Claims (1)

[Claims] 1. A shadow mask, a frame to which a skirt portion of the shadow mask is fixed, and a spring fixed to the frame and attached to a panel pin provided on an inner surface of the panel, wherein the frame includes the shadow mask. In a shadow mask structure having a frame skirt portion which is a fixed side wall for fixing the skirt portion of the mask, and an annular frame flange portion which extends substantially at a right angle to the end of the frame skirt portion, a shadow mask structure is provided on the bottom surface of the frame flange portion. A horizontal bead having a substantially U-shaped cross-section formed annularly or intermittently along the opening shape, and a substantially U-shaped cross-section derived from the horizontal bead and extending from the bottom surface of the frame flange portion to the frame skirt portion. A shadow mask structure having a vertical bead.