JPS60133637A - Color picture tube - Google Patents

Abstract

PURPOSE:To prevent the generation of vibration noises by inserting the connecting pin through the one end face of the mask frame and the flange of the internal magnetic shield respectively at two locations apart from each other along the longitudinal line of the pin itself. CONSTITUTION:A square-shaped mask frme 9, which has a shadow mask 1 fixed on it, has a hole 11 in its one end face 10, and a cylindrical internal magnetic shield 12 has a hole 15 in its flange 14 which is opposite and parallel to the one face 10 (of the mask frame 9) with the prescribed space 13. A connecting pin 16 penetrating the holes 11, 15 consists of a band-shaped spring bent like a hair- pin and has concave depressed portions 17, 18 at two locations apart from each other along its longitudinal line, and it is fitted and pressure-contacted with the one end face 10 and the flange 14 respectively on the outer sides of the concave depressed portions 17, 18. In this way, even when the internal magnetic shield 12 should vibrate, it will not make vibration noises by contacting the mask frame 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color picture tube comprising an internal magnetic shield coupled to a mask frame to which a shadow mask is fixed.

Conventional configurations and their problems In general, color picture tubes equipped with internal magnetic shields:
As shown in FIG. 1, an internal magnetic shield 3 is coupled to a mask frame 2 to which a shadow mask 1 is fixed.

In this case, the internal magnetic shield 3 is coupled to the mask frame 2 by passing the clip pin 8 through the mask frame as shown in FIG.

By the way, in the conventional color picture tube configured as described above, although the mask frame 2 and the internal magnetic shield 3 come into close contact at the pin penetration portions, they contact each other relatively loosely between the pin penetration portions. When the demagnetizing alternating current flows through the demagnetizing coil attached to the color picture tube, that is, immediately after turning on the power switch of the television receiver, vibrations occur between the flange portion 6 and one end surface 4. There was a problem in that vibration noise was likely to be generated due to contact.

OBJECT OF THE INVENTION Accordingly, an object of the present invention is to provide a color picture tube that does not generate the above-mentioned vibration noise.

Structure of the Invention In the color picture tube of the present invention, the flange portion of the internal magnetic shield does not come into contact with one end surface of the mask frame, but is provided with a predetermined interval therebetween, and each hole in the one end surface and the flange portion The coupling pin that passes through engages with the one end surface and the seven run 9 portions at two separate locations along its length.

DESCRIPTION OF EMBODIMENTS In FIGS. 3 and 4, a rectangular mask frame 9 to which a shadow mask 1 is fixed has a hole 11 in one end surface 10, and a cylindrical mask frame 9 made of a magnetic metal such as low carbon steel. The internal magnetic shield 12 is arranged at a predetermined interval 13 with respect to one end surface 1O.
A hole 16 is provided in the flange portion 14 facing parallel to each other. The coupling pin 16 that passes through the holes 11° 16 is made by bending a band-shaped spring piece into a hairpin shape, and has recessed stepped portions 17 and 18 at two locations spaced apart along the length. One end surface 10 on each outer surface of the recessed step 17,18
and the flange portion 14, respectively.

The mutual spacing between the two recessed stepped portions 17 and 18, ie, the predetermined spacing 13, ensures that even if the internal magnetic shield 12 undergoes vibration as described above, the flange portion 14 thereof will not touch the one end surface 10 of the mask frame 9. The size is chosen to be about a few inches long without contact. Since the flared portion 19 formed at the outer peripheral edge of the flange portion 14 of the internal magnetic shield 12 covers the outer surface of the side wall of the mask frame 9, the internal magnetic shield 12 and the mask frame 9 are still separated even though the predetermined interval 13 exists. magnetic coupling is maintained.

In the color picture tube according to the present invention configured as described above,
Since the flange portion 14 of the internal magnetic shield 12 and one end surface 10 of the mask frame 9 create a predetermined interval 13 between them, even if the internal magnetic shield 12 vibrates as described above, this vibration will not affect the mask frame 9. No vibration noise will be generated by contact. Further, since the flare portion 19 at the outer peripheral edge of the flange portion 14 covers the outer surface of the side wall of the mask frame 9, there is no reduction in the magnetic shielding effect due to the formation of the predetermined interval 13.

The coupling pin is not limited to the hairpin shape described above. In the embodiment shown in FIG. 5, a curved spring piece 2O is interposed as a spacer between one end face 1O of the mask frame 9 and the flange part 14 of the internal magnetic shield 12, and a hole bored in the spring piece 2O is provided as a spacer. A hook-shaped coupling pin 21 is passed through the connector, and two portions of the pin 21 are engaged with the one end surface 10 and the flange portion 14, respectively. Further, in the embodiment shown in FIG. 6, a predetermined interval 13 is formed by screwing a coupling pin 22 made of a bolt into each screw hole of the one end surface 10 and the flange portion 14.

Effects of the Invention Since the color picture tube of the present invention is constructed as described above,
In its practical operation, even if a demagnetizing alternating current flows through the demagnetizing coil and causes vibrations in the internal magnetic shield, the vibration noise generated by contact with the mask frame is completely eliminated.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the joint between the mask frame and the internal magnetic shield of a conventional color picture tube, FIG. 2 is a partial cross-sectional view of the joint, and FIGS. 3 to 6 are according to the present invention. Fig. 3 is a partially cutaway perspective view showing the state of coupling between the mask frame and the internal magnetic shield, Figs. 4 and 6 are perspective views of the main parts, and Fig. 6 shows the main parts. FIG. -1...Shadow mask, 9...
Mask frame, 12... Internal magnetic shield,
16, 21, 22... Connecting pins. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 5 f Figure 6

Claims (1)

[Claims] a mask frame to which a shadow mask is fixed; a cylindrical internal magnetic shield having a flange portion facing one end surface of the mask frame at a predetermined interval on one opening edge; a coupling pin that passes through holes drilled in each of the holes, and the coupling pin is engaged with the one end surface and the flange portion at two locations spaced apart along the length direction, respectively. color picture tube.