JPS5816129Y2 - color picture tube - Google Patents

Description

[Detailed description of the invention] The present invention is a shadow mask type color picture tube, in particular, a contact spring that electrically connects the mask frame to a conductive film attached to the inner wall of the bulb funnel part. This relates to the securing structure.

In general, a shadow mask type color picture tube is constructed as shown in FIG.
It includes a contact spring 6, a fluorescent film 7, a metal back 8, a conductive film 9, and the like.

However, the mask frame 4 is elastically attached to the face panel portion of the valve 1 by two or four metal springs 10 and embedded metal pins 11 attached to the outer surface of the side wall, and is attached to the funnel portion of the valve 1. A conductive film 9 attached to the inner surface of the valve is electrically connected to an anode button terminal 12 buried in the valve funnel.

Further, the mask frame 4 and the magnetic shield body 5 are connected to each other by a large number of clasp pins 13 penetrating the bottom walls of both, and the contact springs 6 and the mask frame 4 are connected to each other by X as shown in FIG. Spot welded at the welding points indicated by marks.

In the operation of the color picture tube constructed in this way,
Direct current high voltage force applied to the anode button terminal 12, ``conductive film 9
, applied to the shadow mask 3 through the contact spring 6 and the mask frame 4, as well as the mask frame 4.
Since the force is applied to the metal back 8 through the spring 10 and the valve-embedded metal pin 11, the forces on the inner surface of the face panel portion and the inner surface of the funnel portion of the valve 1 are kept at equal potential.

By the way, the contact spring 6 and the magnetic shield body 5
Since these are useless at the stage where the fluorescent film 7 is formed by repeated exposure and development, they are used in the shadow mounted inside the face panel after the fluorescent film 7 and metal back 8 are formed. Generally, it is attached to a mask frame with a mask.

For this reason, the contact spring 6 is connected to the mask frame 4.
There was a risk that the shadow mask 3 would be clogged or deformed due to sparks generated during the process of spot welding, contact with the welding rod, etc., and there was also a risk that the fluorescent film 7 would be damaged.

The present invention has been devised to eliminate the drawbacks of the conventional art as described above.Next, the color picture tube of the present invention will be explained along with embodiments shown in the drawings.

3 and 4, the mask frame 4 to which the shadow mask 3 is welded has a stud pin 15 on its bottom wall 14 that protrudes toward the electron gun, and a contact spring 16 has a stud pin 15 on its fixed edge 17. Hole 18 into which pin 15 is inserted and inner peripheral surface 19 of mask frame bottom wall 14
Alternatively, it has a bent portion 20 that comes into contact with the inner circumferential surface of the bottom wall 22 of the magnetic shielding body 21 .

Further, the magnetic shield body 21 has a hole 23 in its bottom wall 22 into which the stud pin 15 is inserted, and a relief hole 25 for the contact spring 16 in the side wall 24.

Then, the clamp 26 is press-fitted into the stud pin 15 that passes through the hole 23 formed in the bottom wall 22 of the magnetic shield body 24 and the hole 18 formed in the fixed end edge 17 of the contact spring 16, and the clamp 26 is press-fitted into the mask frame 4. , the magnetic shield body 24 and the contact spring 16 are secured together.

However, a large number of stud pins are provided on the bottom wall 19 of the mask frame 4, and even at these pin positions, the mask frame 4 and the magnetic shield body 24 are crimped and engaged using a clamp. Ru.

Further, in the above embodiment, the bottom wall 14 of the mask frame 4
The bottom wall 22 of the magnetic shield 21 is superimposed on top of the bottom wall 22, and the fixed end edge 17 of the contact spring 16 is superposed on top of the bottom wall 22 of the magnetic shield 21.
The fixed end edge 17 of the contact spring 16 may be interposed between the two bottom walls 14 and 22, and in this case, the escape hole 25 is not required in the side wall 24 of the magnetic shield body 21. In a color picture tube, a stud pin that passes through the bottom wall of the magnetic shield body and the fixed end edge of the contact spring is erected on the bottom wall of the mask frame, and a clamp press-fitted into the stud pin and the fixed end edge of the contact spring are erected on the bottom wall of the mask frame. Since the three members are sandwiched between the bottom wall and the bottom wall, the contact spring can be fixed to the mask frame without welding.

Furthermore, since the fixed edge of the contact spring has a bent portion that comes into contact with the inner circumferential surface of the mask frame or the magnetic shield, even if a strong force is applied to the contact spring from the outside, the same The spring has a fixed edge and will never rotate, move or fall out.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional color picture tube, Fig. 2 is a partial perspective view of the same color picture tube, and Fig. 3 is an exploded perspective view of the main parts of a color picture tube implementing the present invention. FIG. 4 is a perspective view of the main part 1. 1...Valve, 3...Shadow mask, 4...Mask frame, 5.21...
-Magnetic shielding body, 6.16... Contact spring, 9... Conductive film, 15... Stud pin, 20... Bent part.

Claims (1)

[Scope of utility model registration request] A stud pin that passes through the bottom wall of the magnetic shield and the fixed end edge of the contact spring is erected on the bottom wall of the mask frame, and the contact is made between the clamp press-fitted into the stud pin and the bottom wall of the mask frame. The fixed end edge of the spring and the bottom wall of the magnetic shield body are sandwiched, and the fixed end edge has a bent portion that comes into contact with the inner circumferential surface of the mask frame or the magnetic shield body. color picture tube.