JPH071679B2 - Electrostatic deflection type cathode ray tube - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic deflection type image pickup tube or a cathode ray tube provided with a deflectron type horizontal and vertical deflection electrodes.

2. Description of the Related Art In general, an electrostatic deflection type image pickup tube of a deflectometry type horizontal,
The vertical deflection electrode is made of an arrow-shaped conductive film as shown in FIG. However, a pair of horizontal deflection electrodes 1
a and 1b are respectively connected to the two conductive films 2a and 2b for power supply, and the pair of vertical deflection electrodes 3a and 3b located between the pair of horizontal deflection electrodes 1a and 1b are two conductive films for power supply. It is connected to 4a and 4b respectively. Horizontal and vertical deflection electrodes 1a, 1b, 3a, 3
b and the conductive films 2a, 2b, 4a, 4b for power supply are provided on the inner peripheral surface of the glass bulb with a fine interval for insulating between electrodes, and the conductive film 2a and the conductive film 2b are glass bulbs. Are formed symmetrically with respect to the tube axis, and the conductive films 4a and 4b are formed symmetrically with respect to the tube axis. In addition, Z in the figure
Indicates the tube axis direction of the glass bulb, and θ indicates the rotation direction around the tube axis. In addition, the conductive films 2a, 2 for power feeding
Four conductive pieces 5a, 5b, 6a, whose tongue-shaped tips are pressed against b, 4a, 4b,
Each base end portion of 6b is welded to the pipe inner portion of the stem lead wire (not shown). The getter mirror 7 is a conductive piece 6a.
It is formed on the inner peripheral surface of the glass bulb by flashing the barium-containing getter substance of the ring getter 8 attached to the glass bulb.

Problems to be Solved by the Invention In the conventional image pickup tube configured as described above, although it is acceptable that the getter mirror 7 partially overlaps the conductive film 4a, the getter mirror 7 extends over the conductive film 4a and other conductive films. If they are formed as a result, there is a risk of causing a short circuit between the electrodes.
Therefore, the flash amount of the getter 8 can be suppressed to a small amount
Although it is inevitable to shorten the length of the deflection electrode in the tube axis direction, this causes a reduction in the vacuum degree in the tube and the deflection sensitivity. Further, if a long glass bulb is used, not only the cost will be increased, but also the demand for smaller and lighter sets will not be met.

Means for Solving the Problems According to the present invention, two power supply conductive films connected to a pair of deflectron type horizontal deflection electrodes and two power supply conductive films connected to a pair of deflectron type vertical deflection electrodes are provided. It is formed asymmetrically with respect to the tube axis of the glass bulb.

Action With this configuration, it is possible to form a power supply conductive film other than the power supply conductive film closest to the region where the getter mirror is formed in a region sufficiently far from the getter mirror formation region, and to supply a plurality of power supplies. It is possible to prevent a short circuit between electrodes caused by the getter mirror overlapping the conductive film for use without suppressing the getter flash amount or lowering the deflection sensitivity, and without using a long glass bulb.

Embodiment The configuration of the embodiment of the present invention shown in FIG. 1 is different from that shown in FIG. 2 in that a pair of horizontal deflection electrodes 1a and 1b are connected to each other.
One of the power supply conductive films 9a and 9b and the latter of the two power supply conductive films 10a and 10b connected to the pair of vertical deflection electrodes 3a and 3b are formed by θ.
The width of the ring getter 8 is narrow and the width of the former conductive film 10a is large in the θ direction.
Is provided. That is, the pair of power supply conductive films 9a and 9b and the pair of power supply conductive films 10a and 10b are formed asymmetrically with respect to the tube axis of the glass bulb.

However, here, the horizontal and vertical deflection electrodes 1a, 1b, 3a, 3b and the conductive films 9a, 9b, 10a, 10b for power feeding are formed on the inner peripheral surface of the glass bulb by vapor deposition on the conductive film by laser beam It is obtained by irradiating light and separating it into a predetermined film shape.

With such a structure, the getter mirror 7 is a conductive film.
Eliminates the fear of overlapping conductive films other than 10a,
It is possible to prevent the above-mentioned short circuit between electrodes.

In the embodiment shown in FIG. 2, the three conductive films 9a, 9b, 10b are arranged in the tube axis direction, so that the width of the conductive film 10a in the θ direction can be further increased.

Although the image pickup tube has been described above, the present invention can be similarly applied to other cathode ray tubes.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to prevent a short circuit between electrodes due to a getter mirror being formed over a plurality of conductive films, and in particular, a conductive film formed by uniform deposition The film is separated by the laser beam light, and thus it is applied to a cathode ray tube in which horizontal and vertical deflection electrodes and a conductive film for power supply connected to them are provided, and an excellent effect is exhibited.

[Brief description of drawings]

FIG. 1 and FIG. 2 are development views of a main part of an electrostatic deflection type cathode ray tube embodying the present invention, and FIG. 3 is a development view of a part of a conventional electrostatic deflection type cathode ray tube. 1a, 1b …… horizontal deflection electrodes, 3a, 3b …… vertical deflection electrodes, 9a, 9
b, 10a, 10b ... Conductive film for feeding, 7 ... Getter mirror,
8 …… Ring getter.

Claims (1)

[Claims] 1. An inner peripheral surface of a glass bulb, the inner peripheral surface of the glass bulb being located between the two power supply conductive films connected to the pair of deflectron horizontal deflection electrodes and the pair of horizontal deflection electrodes. An electrostatic deflection type cathode ray tube, characterized in that two conductive films for feeding, which are connected to a pair of vertical deflecting electrodes of the deflecton type attached to the surface, are formed asymmetrically with respect to the tube axis of the glass bulb.