JPH023246Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an assembly device for an in-line electron gun used in a cathode ray tube.

Figure 1 shows the main parts of a conventional in-line electron gun. In the figure, 1 and 2 are flat electrodes,
3 and 4 are cup-shaped electrodes, each of which has three holes a, b, and c formed at a predetermined pitch through which the electron beam passes; 3 and 4 must be arranged so that they overlap in a predetermined positional relationship on the same axis. Figures 2 and 3 show these electrodes 1, 2, 3,
4 shows a device for assembling electrodes 1,
Rod-shaped mandrels 5, 6, 7 having outer diameters corresponding to hole diameters 2, 3, 4, and mandrels 5, 6, 7
The frame body 8 holds the bases 5a, 6a, 7a of the electrodes in close contact with each other, and the electrodes 1, 2, 3, 4 mutual holes a, b, c
can be regulated to a predetermined positional relationship.

Incidentally, the pitch of the mandrels 5, 6, and 7 is determined by the outer diameter of the base portions 5a, 6a, and 7a, but an error of about 0.01 mm occurs depending on the machining accuracy. Furthermore, the pitches of the holes a, b, and c in the electrodes 1, 2, 3, and 4 also generate errors of about 0.005 to 0.01 mm.

For this reason, the electrodes 1, 2,
To insert 3 and 4 without force, use mandrel 5,
The outer diameter dimensions of electrodes 6 and 7 are the holes a of electrodes 1, 2, 3, and 4.
It has to be about 0.02 mm smaller than the diameters b and c, and in this case, the holes between electrodes 1, 2, 3, and 4 will be misaligned, which will greatly deteriorate the performance of the electron gun. .

This invention was made to solve the above-mentioned drawbacks, and the mandrel was made somewhat movable to provide an electron gun with no hole misalignment.

Hereinafter, this invention will be explained as an example in Figs. 4 and 5.
The diagram will be explained.

In the figure, the widthwise direction of the inner dimensions of the frame 8 is the pitch of the holes a, b, c of the electrodes 1, 2, 3, 4, and the length is three times the length of the holes a, b, c pitch of the electrodes 1, 2, 3, 4. , base 5 in mandrels 5, 6, 7
The outer diameters of holes b, 6b, and 7b are formed to be approximately 0.005 mm smaller than the pitches of holes a, b, and c, and as a whole, between the mandrels 5, 6, and 7, and between the mandrels 5,
6, 7 and the frame body 8 are configured to have a gap of 0.005 mm to 0.015 mm. That is, the pitches between the mandrels 5, 6, and 7 are the holes a, b, and c.
It is configured to be movable in the arrangement direction so that it can be made larger or smaller than the pitch, and also movable in a direction perpendicular to the arrangement direction.
Base portions 5b, 6b of mandrels 5, 6, 7,
Although not shown, a key is provided between 7b and the frame 8 for the purpose of preventing the mandrels 5, 6, and 7 from falling off.

With this configuration, when inserting the electrodes 1, 2, 3, 4 into the mandrels 5, 6, 7, the holes a, b, c of the electrodes 1, 2, 3, 4 are inserted into the mandrels 5, Since the electrodes 6 and 7 move somewhat, the outer diameter of the mandrels 5, 6, and 7 can be reduced by about 0.01 mm relative to the diameters of the holes a, b, and c of the electrodes 1, 2, 3, and 4. , 3, 4 can be easily inserted, and the hole misalignment between the electrodes 1, 2, 3, 4 can be reduced.

As explained above, according to this invention, it is possible to reduce the difference between the outer diameter of the mandrel and the hole diameter of the electrode, and therefore the amount of hole misalignment between the electrodes can be reduced, and the electron gun This can contribute to improving the performance of

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the configuration of an in-line electron gun, Figs. 2 and 3 are schematic diagrams showing a conventional assembly device, and Figs. 4 and 5 are an assembly device that is an embodiment of this invention. FIG. In the figure, 1, 2, 3, 4 are electrodes, 5, 6, 7 are mandrels, 5b, 6b, 7b are bases, 8 is a frame,
a, b, and c are electron beam passing holes. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Assembly of an in-line electron gun in which a plurality of electrodes each having three electron beam passage holes provided at a predetermined pitch are assembled by superposing each other so that the corresponding electron beam passage holes of each electrode are positioned on the same axis. The apparatus includes three mandrels inserted into corresponding electron beam passage holes of each of the electrodes to regulate the positional relationship of the electron beam passage holes, and a base of the mandrels arranged in a row. and a frame body for planting and holding the mandrels in a straight line, and when the mandrels are arranged at the predetermined pitch, the direction in which the mandrels are arranged is between the bases of the mandrels and between the bases of the mandrels and the frame body. Further, in a direction perpendicular to the arrangement direction, a gap is provided between the base of the mandrel and the frame by an amount equivalent to the pitch error of the electron beam passage hole pitches of the plurality of electrodes. An assembly device for an in-line electron gun.