JPH0412588Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a color cathode ray tube, and particularly to the structure of a shadow mask structure.

[Conventional technology]

Generally, in the manufacturing process of color cathode ray tubes, a light absorbing film and three types of phosphor dot groups or phosphor stripes are formed on the inner surface of the panel using a shadow mask structure. It is attached and detached each time a film or phosphor is formed. As shown in FIG. 2, the shadow mask structure 1 has a skirt portion 3, which is a part of the shadow mask 2, fixed to a frame 5 by welding or the like, and is attached to the inside of the side wall portion of a panel 8 via a bimetal plate 6 and a spring 11. The shadow mask structure 1 is attached to a plurality of panel pins 9 embedded in the panel 8, so that the shadow mask structure 1 is disposed inside the panel 8 at a predetermined interval. The shadow mask 2 is made of an iron plate with a thickness of about 0.1 to 0.2 mm, provided with many holes 4, and has a spherical part formed by press molding, and is very weak in strength and easily deformed. Deformation of the shadow mask causes color shift and blurring in color cathode ray tubes, and such deformation must be prevented as much as possible.

[Problem that the invention attempts to solve]

In the manufacturing process of color cathode ray tubes, errors in handling by workers can deform the shadow mask and cause errors in the relative positioning of the panel and shadow mask, resulting in defects that cause color shift. Therefore, it is necessary to be very careful when handling the shadow mask structure during the process. In particular, when attaching and detaching the skirt section, which is a part of the shadow mask, when attaching the shadow mask structure to the panel or removing the shadow mask structure from the panel, the worker should lightly bend the spring with the fingers of his hand and at the same time lift the frame. There is a risk that the skirt near the spring may be manually deformed for support. If it is deformed, it has the disadvantage that even the spherical surface of the shadow mask is deformed.

[Means to solve the problem]

The present invention is a shadow mask type color cathode ray tube, in which the shadow mask structure has a skirt part, which is a part of the shadow mask, fixed to the frame by welding, etc., and is bent at the skirt side edge of the shadow mask on the bimetal plate and the bimetal plate. It is attached to a plurality of panel pins embedded inside the side wall portion of the panel via springs having the panel.

〔Example〕

Next, the present invention will be explained in detail based on the drawings. FIG. 1 is a perspective view showing a part of a color cathode ray tube according to the present invention. In the shadow mask structure 1, a skirt portion 3, which is a part of the shadow mask 2, is fixed to a frame 5 by welding. The bimetal plate 6 is fixed to the side wall of the frame 5 by welding, and furthermore, the bimetal plate 6 and the spring 7 are fixed by welding at their joined surfaces. The spring 7 is attached to a panel pin 9 embedded inside the side wall portion of the panel 8, and the relative positional relationship between the shadow mask structure 1 and the panel 8 is determined.

The spring 7 has a surface 7a connected to the bimetal plate 6, a surface 7b that floats up from the bimetal plate 6, and a surface 7b that covers the skirt portion 3 of the shadow mask 2, a connecting portion 7c, and a hole 7 provided in the panel pin 9.
It has d. The surface 7b of the spring 7 that covers the skirt portion 3 covers the shadow mask structure 1 with the panel 8.
The cover is designed to prevent the skirt portion 3 of the shadow mask 2 from being deformed during handling work when attaching the shadow mask structure 1 to the panel 8 and when removing the shadow mask structure 1 from the panel 8.

[Effect of idea]

As explained above, the present invention prevents partial deformation of the shadow mask during the manufacturing process of color cathode ray tubes because a part of the joint surface of the bimetal plate of the spring is raised so as to cover the skirt of the shadow mask. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of a color cathode ray tube equipped with a spring according to the present invention, and FIG. 2 is a sectional view showing a part of a conventional color cathode ray tube. 1...Shadow mask structure, 2...Shadow mask, 3...Skirt portion, 4...Shadow mask hole, 5...Frame, 6...Bimetal plate,
7, 11...Spring, 7a...Joint surface, 7b
...Surface that covers the skirt, 7c...Connection part, 7d...
...hole, 8...panel, 9...panel pin.

Claims (1)

[Scope of utility model registration request] In a color cathode ray tube in which the skirt of the shadow mask is fixed to the frame and placed inside the panel, a part of the bimetal joint of the spring is lifted up so as to cover the skirt of the shadow mask, and between the bimetal plate and the spring. A color cathode ray tube characterized by an inserted skirt section.