JPS63244545A - Color picture tube - Google Patents

Abstract

PURPOSE:To prevent generation of any color shift even if vibration or impact is applied to a picture tube by shifting an elastic supporting member to the major edge side of a shadow mask and installing it at a specific angle to the major axis of the shadow mask. CONSTITUTION:Each elastic supporting member 35 is installed as it is shifted to the major edge side from the corner part of a shadow mask 30 and an installing angle alphabecomes 0-45 degrees to the major axis 15b of the shadow mask 30. Accordingly, defomation particularly torsion of the elastic supporting member 35 caused when vibration or impact is applied is generated in reverse direction against that of the conventional case, then displacement of the shadow mask 30 can be set large in the direction of a minor axis 14b and small in the major axis 15b. Even if the shadow mask 30 is displaced extremely in the direction of the minor axis 14b aligning with the direction of the minor axis 14a of a pannel 1, no color shift is generated on a fluorescent screen composed of a layer of a phosphor material with striped whose longitudinal direction aligns with the direction of the miner axis 14a of the pannel 1. Thus, generation of any color shift can be prevented by setting displacement of the shadow mask 30 large in the direction of the minor axis 14b and small in the major axis 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) This invention relates to a color picture tube with an improved method of supporting a shadow mask.

(Prior Art) As shown in Fig. 5, a shadow mask type color picture tube consists of a substantially rectangular panel (1) and a funnel-shaped funnel (2).
), a fluorescent screen (4) is formed on the inner surface of the panel (1), and this fluorescent screen (
A substantially rectangular shadow mask (5) is disposed on the inner side of the mask 4). Usually, this shadow mask (5) consists of a mass body (6) in which a large number of electron beam passage holes are formed in a predetermined array pattern, and a frame (7) attached to the periphery of the mass body (6). The electron gun (9) is disposed within the neck (8) of the funnel (2).
) The electron beam emitted from the phosphor screen (4)
It is structured to display a color image on top.

Traditionally, such color picture tubes have a phosphor screen (
4) is composed of striped three-color phosphor layers whose longitudinal direction is the short axis direction of the panel (1), and arranged in parallel in the long axis direction of the panel (1), and as shown in FIG. 6, A wedge-shaped elastic support (10) with opposing side pieces is attached to each corner of the frame (7) of the shadow mask (5), and this is inserted from a stud pin provided at the inner wall corner of the panel (1). There is one that is attached to the panel (1) by being locked to the mask support part (11).

By the way, this conventional color picture tube has the following problems. That is, in this conventional color picture tube, as shown in FIGS. 6 and 7, the elastic support (10) is slightly offset toward the short side from the diagonal axis (13) of the shadow mask (5). , the short axis (14b) of the shadow mask (5) coincides with the short axis (14a) of this panel (1), or the arrangement direction (16) of the electron beam passing holes (15) arranged in the same direction.
), the attachment of the shadow mask (5) to the long axis (15b) is within the range of 45 to 90''.On the other hand, the shadow mask (5) is attached to the panel ( 1) When forming the phosphor screen (4) on the inner surface, attachment and detachment are repeated multiple times, so the elasticity of the elastic support (10) cannot be made very strong due to the work involved.

Therefore, if vibration or impact is applied after the color picture tube is assembled, the elastic support (10) will be damaged due to the inertia of the shadow mask (5) and the inner shield (17) attached to this shadow mask (5). ,transform.

In this case, it has a wedge shape and a shadow mask (5).
As shown in FIG. The resultant force of the force F1 perpendicular to the plate surface of one of the side pieces (18) to be locked and the force F2 acting parallel to the plate surface from the negative side is +
Due to the twist by F, the shadow mask (5) becomes
It is displaced as shown by the dashed line in FIG. The amount of displacement is the short axis (1) of the panel (1) or shadow mask (5).
4a) and (14b), their long axes (
15a) and (15b) are large in direction.

Thus, when the shadow mask (5) is displaced in the above manner, the minor axis (14) of the panel (1) is shifted as shown in FIG.
a) Striped three-color phosphor layers (1) of the phosphor screen (4) arranged in parallel in the long axis (15a) direction with the longitudinal direction
The electron beam (20
B).

(20G) and (20R) are shifted as shown by the broken line, causing color shift on the screen.

As a means to reduce the displacement of this shadow mask (5), there is a method of increasing the elasticity of the elastic support (lO).
This method is not preferred because it makes it difficult to attach and detach the shadow mask (5) when forming the phosphor screen (4). There is also a way to reduce the weight of the shadow mask (5) and inner shield (17) to reduce their inertia.
To achieve this, it is necessary to reduce the weight of the frame (7), which accounts for a large proportion of the weight of the shadow mask (5).As a result, not only the molding accuracy and strength during handling become a problem, but also the color image reception Utility drift due to thermal expansion during tube operation poses a problem.

(Problems to be Solved by the Invention) As described above, a substantially rectangular shadow mask is disposed on the inside facing a fluorescent screen formed on the inner surface of a substantially rectangular panel. Conventionally, in color picture tubes in which the shadow mask is attached to a panel, elastic supports are attached to the corners of the shadow mask by locking them to mask supports provided at the corners of the inner wall of the panel. The installation angle α is 45 to 90 degrees with respect to the long axis of the shadow mask, so when vibrations or shocks are applied to the color picture tube, the shadow mask and inner shield are deformed due to inertia, causing the shadow mask to become There is a problem in that the displacement is larger in the long axis direction than in the axial direction, causing color shift on the screen. The displacement of this shadow mask is
This can be alleviated by increasing the elasticity of the elastic support or by making the shadow mask, especially the frame, which accounts for a large amount of weight, lighter; however, such measures do not affect the workability of forming the phosphor screen or the characteristics of the color picture tube. Other problems such as deterioration occur, making it impossible to put it into practical use.

This invention was made in order to solve the above-mentioned problems, and a phosphor layer consisting of striped phosphor layers arranged in parallel in the long axis direction with the short axis direction of the panel as the long axis direction is provided on the inner surface of a substantially rectangular panel. A substantially rectangular shadow mask is provided inside the panel, facing the phosphor screen, and this shadow mask is attached to a mask support provided at a corner of the panel. A color picture tube that is mounted by locking an elastic support attached to the corner of the color picture tube, which does not cause color shift due to displacement of the shadow mask even if vibration or impact is applied to the color picture tube. The purpose is to construct a pipe.

[Structure of the invention]

(Means for solving the problem) A phosphor screen is formed on the inner surface of a substantially rectangular panel, and is made of striped phosphor layers arranged in parallel in the long axis direction, with the short axis direction of the panel being the long axis. A substantially rectangular shadow mask is disposed inside the panel, with the short axis and long axis directions of the panel being the short and long axis directions, respectively, and this shadow mask covers the corner portion of the panel. In a color picture tube supported by an elastic support attached to a corner portion of the shadow mask being locked to a mask support provided in the shadow mask, the elastic support is attached to a long side of the shadow mask. Move it to one side,
The shadow mask was attached at an angle of θ to 45° with respect to the long axis.

(Function) As described above, the elastic support that supports the shadow mask is mounted at an angle of 0 to 45'' with respect to the long axis of the shadow mask, with its long sides offset to one side at the corners of the shadow mask. Even if the elastic support is deformed by vibration or impact, the displacement in the long axis direction of the shadow mask can be reduced.Thus, the short axis direction of the panel is the longitudinal direction, and the long axis direction of this panel is parallel to the long axis direction. For a phosphor screen consisting of a striped phosphor layer, even if it is displaced in the short axis direction,
A color picture tube that does not cause color shift on the screen, and therefore does not cause color shift, can be obtained by reducing the displacement in the long axis direction.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

The overall configuration of the color picture tube of the present invention is the same as the conventional color picture tube described above, so the explanation thereof will be omitted.
The main structure will be described below.

FIG. 1 shows a panel (1) constituting the front part of the envelope of a color picture tube according to an embodiment of the present invention, and a shadow mask (30) attached to the inner side of the panel (1) and the shadow mask (30) attached to its back side, that is, It is a view seen from a shadow mask (30). As shown in this figure, the panel (1) is formed into a generally rectangular shape with skirt-like side walls around its periphery, and on its inner surface are
A phosphor screen is formed in which striped three-color phosphor layers whose longitudinal direction is the short axis (14a) of the panel (1) are arranged in a predetermined arrangement order in the long axis (15a) direction of the panel (1). has been done.

And, facing this fluorescent screen, a substantially rectangular shadow mask (30) is arranged so that the short axis (14a) and the long axis (15a) of the panel (1) are aligned in the short axis (14b) and long axis (15b) directions, respectively. They are arranged almost coaxially. This shadow mask (30) consists of a mask body (31) facing the phosphor screen in which a large number of electron beam passage holes (15) are formed, and a frame (32) attached to the periphery of the mask body (31).
), and a plurality of electron beam passing holes (15) are linearly arranged via narrow bridges in a direction parallel to the short axis (14b) of the shadow mask (30). 14b) are arranged in multiple rows in the long axis (15b) direction of the shadow mask (30).

In the color picture tube of this example, as shown in an enlarged view in FIG.
14b) or the direction of arrangement of the electron beam passing holes (15) [16] parallel to this short axis (14b), as shown by the angle α, so that the angle is 0 to 45'' with the long axis (15b). , opposite side pieces (33), (34) are attached to a wedge-shaped elastic support (35).One side piece (33) of this elastic support (35) is also attached to a panel. It is attached to the panel (1) by being engaged with a mask support part (11) consisting of a stud pin attached from the inner wall corner of (1) slightly toward the long side thereof.

Now, as described above, shift the elastic support (35) from the corner of the shadow mask (30) to the long side.

If the shadow mask (30) is installed at an angle of 0 (α<45 m) with respect to the long axis (15b), the elastic support (35) will not be deformed, especially torsion, when subjected to vibrations or shocks. can be made in the opposite direction to that in the conventional case, and thereby the displacement of the shadow mask (30) can be made large in the short axis (14b) direction and small in the long axis (15b) direction. by the way.

In a phosphor screen composed of a striped phosphor layer whose longitudinal direction is the short axis (14a) of the panel (1), the shadow mask (30) coincides with the short axis (14a) of the panel (1). Even if there is a large displacement in the short axis (14b) direction,
No color shift occurs. Therefore, by making the displacement of the shadow mask (30) larger in the short axis (14b) direction and smaller in the long axis (15b) direction as described above, it is possible to create a color picture tube that does not cause color shift on the screen. can. Moreover, in this case, there is no need to change the elasticity of the elastic support (35) or the weight of the shadow mask (30), so it is not necessary to change the elasticity of the elastic support (35) or the weight of the shadow mask (30). No deterioration of color picture tube characteristics.

Next, other embodiments will be described.

In the example shown in FIG. 3, the elastic support mounting portion of the shadow mask (30) is shifted toward the long side from the corner portion, and
As shown in FIG. 4, one side piece (33) of the elastic support (35) that is engaged with the mask support (11) is laterally shifted so that the elasticity of the shadow mask (30) The support is attached to the elastic support (35) attached to the part.
is adapted to be locked to a mask support portion (11) provided at a corner portion of the panel (1). Even if the elastic support (10) is configured as described above, this elastic support (10)
34) can be installed at an angle of 0 to 45@ as shown by the angle α with the short axis of the shadow mask (30) or the arrangement direction (16) of the electron beam passage holes (15), and vibration It is possible to provide a color picture tube that does not cause color shift due to shock or impact.

[Structure of the invention]

A phosphor screen consisting of a striped phosphor layer whose longitudinal direction is the short axis direction of this panel is formed on the inner surface of a substantially rectangular panel, and facing this phosphor screen, inside the panel,
A substantially rectangular shadow mask is attached to a mask support provided at a corner of the panel with an elastic band attached to a corner of the shadow mask, with the short and long axes of the panel being the short and long axes, respectively. In a color picture tube mounted by locking a support.

The elastic support is shifted from the corner of the shadow mask to the long side, and
When installed at an angle of 5", the displacement of the shadow mask against vibrations and shocks applied to the color picture tube can be made larger in the short axis direction of the panel and smaller in the long axis direction. For a phosphor screen made of a striped phosphor layer whose longitudinal direction is the axial direction, color shift does not occur even if the displacement in the short axis direction is large, so the displacement in the long axis direction is made small as described above. This makes it possible to provide a color picture tube that does not cause color shift on the screen.

Moreover, since there is no need to particularly change the elasticity of the elastic support or the weight of the shadow mask, there is no need to reduce the workability of attaching and detaching the shadow mask when forming the phosphor screen or other color picture tube characteristics. This makes it possible to create an excellent color picture tube.

[Brief explanation of the drawing]

1 to 4 are illustrations of an embodiment of the present invention, in which FIG. 1 is a diagram showing the main structure of a color picture tube according to an embodiment, FIG. 2 is an enlarged view of a part thereof, and FIG. The figure shows a partially enlarged view of the main part of another embodiment, and Figures 4(A) to 4(C) are respectively a plan view, a front view, and a side view showing a cross section of the elastic support. The figure shows the configuration of a color picture tube, Figure 6 shows the main part configuration of a conventional color picture tube, Figure 7 shows an enlarged view of a part of it, and Figure 8 shows a conventional color picture tube. The second diagram, which is an explanatory diagram of deformation of the elastic support in the tube, is an explanatory diagram of color shift that occurs when the shadow mask is displaced due to deformation of the elastic support.

Claims (3)

[Claims] (1) A phosphor screen consisting of striped phosphor layers parallel to each other in the long axis direction is formed on the inner surface of a nearly rectangular panel, with the short axis direction of the panel being the longitudinal direction. A nearly rectangular shadow mask is disposed with the short axis and long axis directions of the panel as the short and long axis directions, respectively, and this shadow mask is attached to a mask support provided at a corner of the panel. In a color picture tube supported by locking elastic supports attached to the corners of the mask, the elastic supports are shifted toward the long sides of the shadow mask, and the elastic supports are shifted toward the long sides of the shadow mask relative to the long axis of the shadow mask. A color picture tube characterized in that the lever is mounted so that the angle facing the short axis of the shadow mask is 0 to 45 degrees. (2) The color picture tube according to claim 1, wherein the elastic support is wedge-shaped with opposite side pieces facing each other, and the mask support portion is offset along the long sides of the panel. (3) A color picture tube according to claim 1, characterized in that the elastic support is formed into a wedge-shaped shape in which the opposing side pieces are laterally offset.