JPS6224539A - Color picture tube - Google Patents

Abstract

PURPOSE:To enable formation of dense dots on the face panel when forming a fluorescent screen by bending the shadowmask side end section of frame into C-shape to the tube axis side. CONSTITUTION:One end of spring 3 will fit in a panel pin 2 burried in the face plate 1 through panel pin fitting hole of spring while the other end is welded to one end of bimetal supporting member 4. The other end of bimetal supporting member 4 and the shadowmask 6 are welded to the frame 5 to bend the shadowmask side end section 5a of frame 5 into C-shape to the tube axis side thus to increase the mechanical strength of frame. With such shadowmask supporting structure, the frame will never deform even upon assembling of frame into a jig when assembling the frame mask thus to enable accurate positioning of the distance of plane passing through the center of fitting holes of three springs and the curved face of shadowmask. Consequently, the dots can be arranged densely onto the face panel when forming the fluorescent face.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color picture tube with an improved structure for supporting a shadow mask.

[Conventional technology]

FIG. 2 is a front view of a face spring, lever and shadow mask assembly for explaining an example of a conventional color picture tube, and FIG. 3 is a sectional view thereof. In FIG. 2, the face panel 1 has a panel pin 2a.

2b, 2c, and 2d are buried. These panel bin locations are not on the horizontal or vertical axes of the face panel, but are near the corners of the face panel.

This is applied to color picture tubes installed on aircraft.
This is intended to improve vibration resistance by holding the entire shadow mask structure at a portion of the corner of the face panel. On the other hand, the shadow mask 6 is welded to the frame 5', and the springs 3a, 3b, 3c, 3d are also welded to the frame 5' via bimetallic support members 4a, 4b, 4c, 4d. and spring 3
a.

The shadow mask structure is held within the face panel by fitting the panel bins 2a, 2b, 2c, and 2d into the panel bin fitting holes provided in the panel bins 3b, 3c, and 3d.

To assemble such a shadow mask structure, first, the spring 3 and the bimetallic support member 4 are welded, the f% bimetallic support member 4 and the frame 5' are welded, and finally the frame 5' and the shadow mask 6 are welded. It is carried out according to the following steps. When connecting the last frame 5' and the shadow mask 6, care must be taken to ensure that the desired distance is maintained between the inner surface of the face panel and the curved surface of the shadow mask when the frame and mask are assembled into the face panel. Must be. The standards for maintaining this distance are panel pins 2a and 2b embedded in the face panel 1.

This is a plane that divides the center of the 3 bins of 2c. Therefore, the panel bin 2a is
, 2b, 2c springs 3a, 3b that fit into the three pins
, 3c, and the curved surface of the shadow mask, it is necessary to accurately position the distance 'AL In this way, when the four spring fitting holes are fitted into the panel pins of the face panel after the frame/mask assembly is completed, the inner surface of the face panel and the shadow mask surface are maintained at the desired distance.

[Problems to be solved by the invention] - The shadow mask support structure of the conventional color picture tube with double FFE is made thinner and lighter by thinning the frame and increasing the strength of the spring in order to improve vibration resistance. Since the frame is strong, when the frame with the spring welded is installed in the frame mask assembly jig, the frame with the spring welded will be attached as shown in Figure 6.
deformation occurs, resulting in poor fitting with the shadow mask, and the distance between the plane passing through the centers of the fitting holes of the three springs and the curved surface of the shadow mask is not positioned accurately. Therefore, when the four spring fitting holes are fitted into the panel bin of the face panel after the frame/mask assembly is completed,
There is a drawback that the inner surface of the face panel and the curved surface of the shadow mask do not have a desired distance, and the drums cannot be densely arranged on the tooth panel surface when forming the phosphor screen.

[Means for Solving the Problems] The present invention solves the above-mentioned drawbacks without increasing the thickness of the frame in a color picture tube in which a shadow mask and a frame for holding the shadow mask are aged. The shadow mask side end of the tube is bent toward the tube axis side to form a U-shape.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of a face panel portion of an embodiment of the present invention. One end of the spring 3 is fitted into a panel pin 2 embedded in the face panel 1 through a panel pin fitting hole of the spring, and the other end of the spring 3 is welded to one end of a bimetallic support member 4. The other end of the bimetallic support member 4 and the shadow mask 6 are connected to the frame 5, respectively.
is welded to. The end portion 5a of the frame 5 on the shadow mask side is bent toward the tube axis to form a U-shape, thereby increasing the mechanical strength of the frame.

In this type of shadow mask support, the frame is assembled into a jig when assembling the frame and mask, so the frame does not deform, and the distance between the plane passing through the center of the fitting holes of the three springs and the curved surface of the shadow mask is accurate. will be located.

[Effects of the Invention] As explained above, the present invention makes it possible to increase the mechanical strength without increasing the thickness of the frame by bending the end of the frame on the shadow mask side toward the tube axis to form a U-shape. was completed. Therefore, even if the frame is assembled into the jig during frame/mask assembly, the frame will not be deformed, and the distance between the plane passing through the centers of the fitting holes of the three springs and the curved surface of the shadow mask will be accurately positioned, and the frame/mask assembly will be completed. When the four spring fitting holes are fitted into the panel bins of the f&face panel, the inner surface of the face panel and the curved surface of the shadow mask will be at the desired distance, and the dots will be densely lined up on the face panel surface when forming the fluorescent screen. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the face panel portion of an embodiment of the present invention, FIG. 2 is a front view of the face panel and shadow mask assembly for explaining an example of a conventional color picture tube, and FIG. Figure 2 is a sectional view, Figure 4 is a perspective view of the frame assembled into the frame/mask assembly jig, and Figure 5 is the 4th cross-sectional view.
The sectional view shown in the figure and FIG. 6 are perspective views when the frame of a conventional color picture tube is assembled in jig No. 2. 1...Face panel, 2.2a, 2b, 2C. 2 d,,,banel pin, 3.3a, 3b, 3c, 3
d・Spring, 4.4a, 4b, 4c, 4d・-ノ〈
Imetal support member, 5.5゛...frame, 6...
・Shadow mask. Agent Patent Attorney Uchihara Otoday 2 Kunishi Y Doumazufu

Claims (1)

[Claims] 1. A color picture tube including a shadow mask and a frame for holding the shadow mask, characterized in that an end of the flume on the shadow mask side is bent toward the tube axis, so that the frame has a U-shape.