JP2003086120A - Explosion-proof cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a single kind of mounting means for an explosion-proof cathode ray tube having an arbitrary size in common, in an explosion-proof cathode ray tube wherein a band frame for applying tightening force to a side wall part is fitted along the circumference of the side wall part and the mounting means are jointed to four corners of the band frame. SOLUTION: This explosion-proof cathode ray tube is characterized in that the mounting means 3 respectively jointed to the outside surfaces of the four corners of the band frame 2 are each composed of a plate-like mounting means body 3a with a cut-out part 3d formed for defining two leg parts 3e, and two plate-like jointing parts 3c extending vertically to the surface of the body 3a from tips of the respective leg parts 3e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof cathode ray tube in which a belt frame is fitted in a side wall portion and a tightening force is applied to the side wall portion, and more specifically, fixtures are provided at four corners of the belt frame. The present invention relates to an explosion-proof cathode ray tube.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a structure of a conventional explosion-proof cathode ray tube in which a band frame is fitted in a side wall portion. In the figure, 1 is a cathode ray tube, and 2 is a band frame for applying a tightening force to the panel side wall portion 1a of the cathode ray tube 1 in order to prevent the implosion of the cathode ray tube 1. The obi frame 2 is, for example, Japanese Patent Publication No. 54-2.
A so-called shrink system as described in Japanese Patent No. 2864 can be used. In this method, first, a tightening strip frame 2 made of thin steel having a uniform thickness and having an inner peripheral length slightly shorter than the outer peripheral length of the panel side wall portion 1a of the cathode ray tube 1 is heated and expanded. After that, the panel side wall portion 1a is fitted into the panel side wall portion 1a, and a tightening force is applied to the panel side wall portion 1a when the tightening band frame 2 returns to room temperature.

The fastening band frame 2 is provided with fittings 3 at its four corners. As shown in FIG. 4, the fixture 3 is composed of a main body 3a having a circular opening 3b and a joint 3c perpendicular to the main body 3a. (R)).

[0004]

The radius of curvature of the corner portion of the tightening strip frame 2 depends on the size of the cathode ray tube, and the larger the cathode ray tube, the larger the radius of curvature. for that reason,
Conventionally, the fixture 3 which is different for each size of the cathode ray tube has been manufactured, which has been a cause of an increase in the manufacturing cost of the explosion-proof cathode ray tube.

The present invention has been made in view of the above problems, and the same fixture can be commonly attached to the tightening strip frame of an explosion-proof cathode ray tube of an arbitrary size, so that the explosion-proof cathode ray tube The purpose is to reduce the manufacturing cost.

[0006]

[Means for Solving the Problems] In order to solve the above problems,
In the invention according to claim 1, in an explosion-proof cathode ray tube in which a band frame for applying a tightening force to the side wall is fitted along the outer periphery of the side wall, the band frame is joined to the outer surfaces of the four corners of the band frame, respectively. The fixture is a plate-shaped fixture main body in which a notch is formed to define two legs, and a plate-shaped fixture extending from the tip of each leg in a direction perpendicular to the surface of the fixture main body. Two
It is characterized by being composed of two joints.

According to a second aspect of the present invention, in the first aspect of the invention, the joint portion is curved so as to come into line contact with the curved surface of the band frame.

A third aspect of the present invention is characterized in that, in the first or second aspect of the invention, the band frame is fitted into the side wall portion by shrink fitting.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 (a) is a top view of an attachment 3 of a fastening band frame fitted into the explosion-proof cathode ray tube according to the first embodiment of the present invention, and FIG. 1 (b) is a front view thereof. In FIG. 1B, the curves R1, R2, R3
Shows the curved shapes of the cross sections of the corner portions of the tightening strip frame fitted into the side wall portions of the 17-inch cathode ray tube, the 19-inch cathode ray tube, and the 22-inch cathode ray tube, respectively.

In the fixture 3 of this embodiment, the plate-shaped main body 3a is provided with the cutout portion 3d in order to absorb the difference in the curved shape of the corner portion due to the difference in the size of the cathode ray tube, that is, the difference in the curvature. It is characterized by this notch 3
The plate-like joints 3c extend in parallel to each other in the direction perpendicular to the surface of the main body 3a from the tips of the two legs 3e defined by d. As shown in FIG. 1B, the joint 3c is placed at the position where the curves R1, R2 and R3 intersect.

According to the structure of this embodiment, the curvatures of the tightening band frame 2 are R1, R2, R due to the difference in size of the cathode ray tube.
Even if it changes like 3, it is possible to allow the interference to escape into the notch 3d, so that the fixture 3 of the same shape can be joined to the tightening band frame of the cathode ray tube of any size. . That is, since the same fixture can be commonly used for cathode ray tubes of any size, it is not necessary to manufacture different fixtures for each cathode ray tube size as in the conventional case.

Embodiment 2. FIG. 2 is an enlarged view showing the vicinity of the joint portion 3c of the fixture 3 of the tightening band frame fitted in the explosion-proof cathode ray tube according to the second embodiment of the present invention. As shown in FIG.
Type cathode ray tube, curves R1 and R representing the curved shape of the corner portion of the tightening band frame 2 fitted on the side wall portion of the 22 type cathode ray tube
The joint portion 3c placed at the intersection of 2 and R3 is curved so as to come into line contact with the curved surface of the corner portion of the fastening band frame 2. According to the configuration of the second embodiment of the present invention, stable joining can be achieved even if the contact angle between the joining portion 3c and the tightening band frame changes.

[0013]

According to the invention described in claim 1, in the explosion-proof cathode ray tube in which the strip frame for applying a tightening force to the side wall portion is fitted along the outer periphery of the side wall portion, the four corners of the strip frame are provided. The fixtures respectively joined to the outer surfaces are a plate-like fixture main body in which a notch is formed so as to define two legs, and a vertical direction from the tip of each leg to the surface of the fixture main body. Since it is composed of two plate-shaped joints extending in the same direction, the same fixture can be commonly used for explosion-proof cathode ray tubes of arbitrary sizes with different curvatures at the corners, and thereby, explosion-proof cathode ray tube. The effect of reducing the manufacturing cost of is obtained.

According to the invention of claim 2, claim 1
In addition to the effect of the invention described in (1), since the joint portion is curved so as to make line contact with the curved surface of the band frame, the joint portion and the tightening band frame can be stably joined even if the contact angle changes. The effect that it can be obtained is obtained.

According to the invention of claim 3, claim 1
In addition to the effect of the invention described in claim 2, the effect of obtaining a stable tightening force is obtained because the band frame is fitted into the side wall portion by shrink fitting.

[Brief description of drawings]

1A and 1B are a top view and a front view of an attachment of a tightening frame body fitted to a side wall portion of an explosion-proof cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a vicinity of a joint portion of a fixture of a tightening frame body fitted to a side wall portion of an explosion-proof cathode ray tube according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a conventional explosion-proof cathode ray tube in which a tightening frame is fitted.

FIG. 4 is a view showing a shape of an attachment of a tightening frame body of the explosion-proof cathode ray tube of FIG.

[Explanation of symbols]

1 cathode ray tube, 1a panel side wall part, 3 fitting, 3a fitting body, 3b opening, 3c joint part, 3d notch part, 3e leg part.

Claims (3)

[Claims] 1. An explosion-proof cathode ray tube in which a strip frame for applying a tightening force to a side wall portion is fitted along the outer periphery of the side wall portion, and fixtures respectively joined to the outer surfaces of the four corners of the strip frame. A plate-shaped fixture main body in which a notch is formed to define two legs, and two plate-shaped joints extending from the tips of the legs in a direction perpendicular to the surface of the fixture main body. Explosion-proof cathode ray tube characterized by being composed of and. 2. The explosion-proof cathode ray tube according to claim 1, wherein the joint portion is curved so as to come into line contact with the curved surface of the band frame. 3. The explosion-proof cathode ray tube according to claim 1, wherein the band frame is fitted into the side wall portion by shrink fitting.