JPH02312143A - Picture receiving tube - Google Patents

Abstract

PURPOSE:To fix a getter supporting metallic plate surely by inserting a supporting piece into one side of an opening, and shifting it to the other end side over a step part, and making a square head abut on the step part, and engaging the square-pillar-shaped strut with the opening of a metallic plate. CONSTITUTION:A supporting piece 4 consists of a square-pillar-shaped strut 4a, which projects inside a picture tube main body, and a square head 4b, which is formed at the end of the strut and whose outside dimension is larger than the strut. Moreover, an elastic metallic plate 5 has a step part, which is high on the getter support side, at the center, and has a trapezoid opening 7 from the getter support side end across the opposite side end, and the maximum width of the opening is made the width that the square head can pass, and the minimum width is made the width that the square strut 4a can engage. And by inserting the square head 4b of the supporting piece into one side of the opening and shifting it to the other side over the step part, the square head 4b and the step part abut on each other, and further the square strut 4a and the opening of the metallic plate engage with each other. Hereby, the getter support metallic plate 5 can be fixed surely without hooking it with a magnetic shield.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a picture tube, and more particularly to an improvement in the structure for attaching a getter supporting metal plate to the inner wall surface of the picture tube.

[Conventional technology]

Conventionally, there have been devices in which a getter is attached to the picture tube (hereinafter also referred to as a cathode ray tube) side; for example, Japanese Patent Application Laid-Open No. 60-2219
Publication No. 41 discloses a structure for such a getter attachment. In this structure, the getter is attached to a getter support metal plate, the getter support metal plate engages a nipple bin attached to the anode terminal, and a metal piece extending from the getter support metal plate serves as an internal magnetic shield. The getter is thereby fixed to the picture tube side.

4 and 5 are a sectional view and a perspective view showing the getter mounting structure of the conventional color picture tube described in the above-mentioned publication, and in the figures, 9 is a funnel portion having a conductive film 8 on the inner surface;
Reference numeral 10 designates an anode terminal embedded in this funnel portion 9, and this terminal 10 has a nipple bottle 11 that projects toward the inside of the tube. Reference numeral 12 denotes a getter support metal plate made of an elastic material with a getter 13 attached to its tip;
4 is engaged in the nipple bottle 11, and the tongue pieces 15 and 16 are in elastic contact with the inner surface of the funnel part 9. Reference numeral 17 denotes an extension extending from the rear end of the getter support metal plate 12, and the locking pawl 17a of this extension 17 engages with the cutout groove 1 of the magnetic shield 18.
9 is engaged.

The picture tube configured as described above has a getter support metal plate 12.
The extension portion 17 of the getter 13 is engaged with the cutout groove 19 of the magnetic shield 18, thereby preventing the getter 13 from moving even if there is an external impact such as during transportation of the picture tube.

[Problem to be solved by the invention]

However, in the conventional getter mounting structure, as described above, the extension part 17 of the getter support metal plate 12 is shielded from the magnetic shield 18.
is locked in the notch groove 19 of the magnetic shield 1.
There was a problem in that the performance of the cathode ray tube deteriorated due to deformation of the tube.

This invention has been made to solve the above-mentioned problems, and provides a picture tube having a getter mounting structure that can securely fix the getter support metal plate without being locked to the magnetic shield. With the goal.

[Means to solve the problem]

The picture tube according to the present invention includes an elastic metal plate that supports a getter within the picture tube body, and a support piece that is embedded in the funnel portion of the cough tube body and that biases and supports the metal plate toward the inner surface of the funnel. The support piece is made of a prismatic column that projects inside the tube body, and a prismatic head that is formed at the tip of the column and has a larger external dimension than the column. The elastic metal plate has a stepped portion in the center and a trapezoidal opening extending from the getter support side end to the opposite side end, and the maximum width of the opening is equal to the width of the prismatic head. The supporting piece is inserted into one end of the opening, moved to the other end over the step, and the minimum width is set to a width that allows the prismatic support to fit through the opening. The prismatic head is brought into contact with the stepped portion, and the prismatic support is fitted into the opening of the metal plate.

[Effect]

In this invention, the support piece that supports the elastic metal plate for supporting the getter includes a prismatic column that projects inside the picture tube body, and a prismatic head that is formed at the tip of the column and has a larger external dimension than the column. The elastic metal plate has a stepped portion in the center where the getter support side is high, and a trapezoidal opening extending from the getter support side end to the opposite end, and the uppermost part of the opening The width is large enough for the prismatic head to penetrate,
Since the minimum width is set to a width that allows the prismatic support to fit, the prismatic head of the support piece is inserted into one end of the opening and moved over the step to the other end, thereby opening the corner. The column head and the stepped portion come into contact, and the prismatic column and the opening of the metal plate fit together, thereby securely fixing the getter support metal plate without engaging the magnetic shield. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 are diagrams for explaining a getter mounting structure of a picture tube according to an embodiment of the present invention, respectively.
The figure is a top view of a getter support metal plate that supports the getter, and FIGS. 3(a) and 3(b) are a top view and a front view showing an anode terminal and a prismatic bottle for attaching the getter on the picture tube side. In the figure, reference numeral 1 denotes a funnel portion of a cathode ray tube, and a conductive film 2 is formed on the inner wall surface of the funnel portion. Reference numeral 3 denotes an anode terminal embedded in the funnel part 1, and the anode terminal 3 has a prismatic bottle (support piece) 4 projecting inside the funnel part 1, as shown in FIG. There is. - This prismatic pin 4 is composed of a prismatic support 4a of the body and a prismatic head 4b having a larger external dimension than the support 4a.

Reference numeral 5 denotes a getter support metal plate (elastic metal plate) made of an elastic material with a getter 6 attached to its tip. As shown in FIG. 1, the central portion has a stepped bent portion (stepped portion) where the getter mounting side is higher. The wide part of the trapezoidal vertically long hole 7 has a width that allows the head 4b of the prismatic pin 40 to pass through, and the tip of the narrow part fits into the support 4a of the prismatic pin 4. It has a U-shape with a width that can be adjusted. That is, when the prismatic bottle 4 is inserted into the wide part of the hole 7 and moved beyond the bent part 7a to the narrow part, the column 4a of the prismatic bottle 4 is inserted into the U-shaped part. are fitted, and the head 4b of the prismatic bottle 4 is brought into contact with the bent portion 7a of the metal plate 5, so that the metal plate 5 does not come off from the prismatic bottle 4. Also 5a
, 6a are contact pieces for the getter support metal plate 5 and the getter 6, respectively.

Next, a method for attaching the getter support metal plate 5 will be described.

First, the head 4b of the prismatic bottle 40 of the anode terminal 3 is inserted into the wide part of the elongated hole 7 of the getter support metal plate 5 to which the getter 6 is attached.
, and move the pin 4 to the narrower side of the elongated hole 7. When the pin 4 reaches a point where the width of the trapezoidal slot 7 is narrower than the width of the head 4b of the prismatic bottle 4, the prismatic bottle 4 cannot be removed from the trapezoidal slot 7 of the getter support metal plate 50. Further, when the prismatic bottle 4 is moved and it passes over the stepped bent portion 7a at the center of the getter support metal plate 5,
The bent portion 7a is lifted up by the elastic force of the metal plate 5, and the head 4b of the prismatic bottle 4 comes into contact with the stepped portion of the bent portion 7a. It will not move to a part wider than the outer dimensions of the head 4b of the bottle 4.

In this state, the contact pieces 5a, 6a of the getter 6 and the getter support metal plate 5 are in elastic contact with the inner wall of the funnel 1 due to the elasticity of the metal plate 5, and are also in elastic contact with the head 4b of the pin 4 and the metal plate 5. Therefore, the head 4b
does not move beyond the stepped bent portion 7a to the getter side.

In this embodiment, the prismatic bottle 4 for supporting the getter support metal plate is attached to the prismatic pillar 4 that protrudes inside the picture tube body.
a, and a prismatic head 4b formed at the tip of the support 4a and having a larger external dimension than the support, and a stepped portion 7a with a higher getter support side formed in the center of the getter support metal plate 7. , a trapezoidal elongated hole 7 is formed extending from the getter support side end to the opposite side end, and the maximum opening width of the elongated hole 7 is defined by a width that allows the prismatic head 4b to pass through, and a minimum width. Since the width is set such that the prismatic pillar 4a can be fitted, the prismatic bottle 4 is inserted into one end of the elongated hole 7 and moved to the other end beyond the bent portion 7a, thereby removing the prismatic head. 4b and the bent portion 7a come into contact, and the prismatic support 4a and the U-shaped opening 7b of the elongated hole 7 of the metal plate fit together, thereby magnetically shielding the regetter supporting metal plate. It can be securely fixed without being locked.

In other words, when the getter support metal plate 5 is attached to the prismatic bottle 4, the prismatic head 4b is caught in the narrow part of the trapezoidal hole 7, and the getter support metal plate 5 is not perpendicular to the inner wall of the picture tube. It will not fall out, and since a stepped bent portion 7a is formed in the middle of the trapezoidal hole 7, the prismatic head 4b will catch on the stepped portion and the wide portion of the trapezoidal hole 7 will not come out. There is no deviation. Further, since the rectangular prismatic bottle 4 and the U-shaped opening 7b formed by the three sides of the rectangle are engaged, it is possible to eliminate the displacement of the getter in the rotational direction about the prismatic bottle 4. Moreover, since the getter support metal plate is composed of one part, it can be manufactured at low cost.

〔Effect of the invention〕

As described above, according to the picture tube according to the present invention, the support piece that supports the elastic metal plate for supporting the getter includes a prismatic column that projects inside the picture tube main body, and a prismatic head that has a larger external dimension than the column. The elastic metal plate has a stepped portion in the center where the getter support side is higher, and a trapezoidal opening extending from the getter support side end to the opposite end, and the uppermost part of the opening The widest width is the width that the prismatic head can penetrate, and the minimum width is the width that the prismatic support can fit into, so the step part and the prismatic head can be used to extend the distance parallel to and perpendicular to the inner surface of the picture tube of the getter. Furthermore, by fitting the prismatic support with the narrow part of the trapezoidal opening, it is possible to prevent the getter from moving in the patent direction characterized by the support piece, thereby preventing the getter from supporting the getter. This has the effect of being able to securely fix the metal plate without locking it to the magnetic shield.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a getter mounting structure of a picture tube according to an embodiment of the present invention, FIG. 2 is a top view showing a support metal plate that supports the getter, and FIG. 3 is a top view showing a support metal plate that supports the getter. A top view and a front view of an anode terminal having a support piece, and FIGS. 4 and 5 are a sectional view and a perspective view, respectively, for explaining a conventional getter mounting structure of a picture tube. l... Funnel part, 2... Conductive film, 3... Anode terminal, 4... Prismatic pin (support piece), 4a... Prismatic support, 4b... Prismatic head, 5 ... Getter support metal plate (elastic metal plate), 6 ... Getter, 7 ... Trapezoidal long hole, 7a ... Bent part (step part), 7b ... U-shaped opening Department. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) An anode terminal having an elastic metal plate that supports the getter within the picture tube body, and a support piece that is embedded in the funnel portion of the tube body and supports the metal plate by urging it toward the inner surface of the funnel. A picture tube comprising: a picture tube in which the support piece is composed of a prismatic strut protruding inside the tube body; and a prismatic head formed at the tip of the strut and having a larger external dimension than the strut; The elastic metal plate has a stepped portion in the center and a trapezoidal opening extending from the getter support side end to the opposite side end, and the maximum width of the opening is wide enough to allow the prismatic head to pass through. and the minimum width is such that the prismatic support can be fitted into the opening, and the support piece is inserted into one end of the opening and moved over the stepped portion to the other end. A picture tube characterized in that the prismatic head is brought into contact with the prismatic support and the metal plate opening is fitted.