JPH0568057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetic focusing electrostatic deflection type image pickup tube equipped with a deflectron type deflection electrode.

Conventional configuration and its problems In general, an electromagnetic focusing electrostatic deflection type image pickup tube equipped with a deflectron type deflection electrode has an electrode configuration as shown in Fig. 1, and the thermoelectrons emitted from the cathode 1 are transferred to the control electrode. 2 and the electron beam diameter control hole 4 of the accelerating electrode 3, and is subjected to a focusing action by a focusing coil (not shown) and a deflecting action by a deflection type deflection electrode 5. Then, the photoconductive film of the target electrode is scanned through a mesh electrode (not shown).
It is necessary to draw out the terminals of the glass bulb 6 to the outside of the glass bulb 6.

Since the deflection electrode 5 consists of one pair for horizontal deflection and one pair for vertical deflection, four conductive springs 7 are pressed into contact with each end of the four deflection electrodes, and relay conductor wires are used to support and fix the springs. 8 are provided, and the deflection electrode terminals are drawn out to the stem lead wire 9 by these.

If the spring pressure of the spring 7 is too small, poor contact between the spring 7 and the deflection electrode 5 is likely to occur, and there is a risk of generating noise when an impact is applied from outside the tube. Therefore, spring 7
Although the spring 7 has a relatively large spring pressure, since the tip of the spring 7 protrudes toward the glass bulb 6 side, the conductor 8 and stem may The lead wire 9 is likely to be deformed. If such a problem occurs, the press contact may not be achieved satisfactorily or contact with other electrodes may occur, which is an undesirable result.

Therefore, as shown in FIG. 2, an insulator piece 10 is attached to the control electrode side of the spring 7 or the conducting wire 8.
Efforts have been made to prevent deformation of the conducting wire 8 and stem lead wire 9, but in this case the deformation prevention effect is limited to the radial direction, and the deformation prevention effect in the circumferential direction cannot be obtained, so this is not a complete countermeasure. It couldn't have happened.

OBJECT OF THE INVENTION It is an object of the present invention to apply sufficient spring pressure to the spring whose tip edge presses against the end of the deflectron-type deflection electrode, while deforming the conducting wire or stem lead wire connected to the spring. The object of the present invention is to provide an image pickup tube that does not cause this problem.

Structure of the Invention In the image pickup tube of the present invention, a glass bulb enclosing an electron gun is provided with a plurality of deflectron-type deflection electrodes on its inner circumferential surface, and a plurality of deflection electrodes are attached to the cylindrical portion of the accelerating electrode of the electron gun. A plate-shaped insulator that is fixed and surrounds the portion has a plurality of small holes on its stem portion side surface. A plurality of stem lead wires or conductive wires connected to the lead wires that pass through the stem part in an airtight manner and extend inside the tube have a distal end that is inserted into the small hole, and the distal end and the stem A conductive spring is fixed between the deflection electrode and the deflection electrode, and the tip edge of the spring is pressed into contact with each end of the deflection electrode.This will be described in detail below with reference to embodiments shown in the drawings.

DESCRIPTION OF THE EMBODIMENTS In FIG. 3, parts common to those shown in FIG. 1 are given the same reference numerals. The plate-shaped insulator 11 surrounding the cylindrical part 3a of the accelerating electrode 3 is made of ceramic, and has a hole in the center for inserting the cylindrical part 3a, and has a hole in its lower surface as shown in FIG. It has four non-penetrating small holes 11a. Two pairs of deflector-type deflection electrodes 5 for horizontal deflection and vertical deflection are attached to the inner circumferential surface of the glass bulb 6, and are made of vapor-deposited chromium.
Four conductive springs 7 whose distal edges are pressed into contact with each end of the pair of deflection electrodes 5 are fixed to four conductive wires 8, and the conductive wires 8 whose proximal edges are fixed to a stem lead wire 9 are , whose tip edges are fitted into four small holes 11a of the insulator 11, respectively. The metal piece 12 welded to the cylindrical portion 3a of the accelerating electrode 3 is ribbon-shaped or ring-shaped, and comes into contact with the upper surface of the insulator 11 to prevent the insulator 11 from lifting up. However, instead of welding the metal piece 12 to the accelerating electrode 3, a glass insulating rod (not shown) is used to support the electrode group.
It may be attached to. Further, the insulator 11 does not have to be completely annular. Furthermore, the stem lead wire 9
The inner part of the tube may be lengthened, the spring 7 may be attached to this, and the tip edge of the stem lead wire 9 may be fitted into the small hole 11a of the insulator 11.

Effects of the Invention In the image pickup tube configured as described above, the plurality of conductive wires or stem lead wires to which the springs are fixed are supported at both ends by the common stem insulator, so that the electron gun can be attached to the glass. Even if the spring pressed inward during insertion into the valve applies a strong force to the supporting wire or stem lead wire, the wire will not bend. Therefore, the spring of the electron gun that has been inserted comes into pressure contact with the deflection electrode portion with a predetermined spring pressure, and the risk of contact with other electrodes due to the bending is also eliminated at the same time.

[Brief explanation of the drawing]

1 and 2 are side sectional views of a part of a conventional image pickup tube, FIG. 3 is a side sectional view of a main part of an image pickup tube in which the present invention is implemented, and FIG. 4 is a side sectional view of an insulator of the same image pickup tube. FIG. 3...Acceleration electrode, 5...Deflection electrode, 6...Glass bulb, 7...Spring, 8...Conducting wire, 9...
...Stem lead wire, 11...Insulator.

Claims (1)

[Claims] 1. A glass bulb enclosing an electron gun has a plurality of deflectron-type deflection electrodes attached to its inner peripheral surface, and a plate-shaped plate fixed to and surrounding the cylindrical part of the accelerating electrode of the electron gun. The insulator has a plurality of small holes on the stem side surface, and a plurality of stem lead wires that pass through the stem portion in an airtight manner and extend inside the tube, or conductive wires connected to the lead wires, are connected to the small holes. It has a tip inserted into the hole, and a conductive spring is fixed between the tip and the stem, and the tip edge of the spring is pressed against each end of the deflection electrode. An imaging tube characterized by: