JPS6025860B2 - Cathode ray tube electrode assembly equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode assembly device for a cathode ray tube, in which the gap between a grid and a cathode can be set to a desired constant value.

Generally, in conventional black-and-white or color televisions, a so-called preheat system is used, and the heater is heated to 60% of its rated power.
Previously, the image output time was shortened by applying voltages before and after, but recently an instantaneous image receiving type cathode ray tube has been developed that can shorten the image output time without preheating.

When a cathode used in such an instantaneous image receiving type cathode ray tube is attached to an electron gun, the cathode and grid are arranged as shown in FIG. 1 or 2.

That is, in the figure, K is the cathode, G is the first grid, and G2, G3, and G4 are the second, third, and fourth grids. By the way, the important beam blocking characteristics for cathode ray tubes are:
It is determined by the closure of the first grid, its plate thickness, the gap between the facing surfaces of the first grid and the cathode, the relative relationship between the first and second grids, etc.

In assembling these electrodes, except for assembling the cathode to the electron gun, it is possible to obtain an assembly with the desired precision by using high-precision electrode parts and using glass beads. It was relatively easy to solve mechanically. However, it has a decisive effect on the beam cutoff characteristics.
Regarding the assembly of the cathodes associated with the first grid, certain assembly problems remain with conventional assembly equipment. As shown in Figures 1 and 2, the first
A device for setting the gap between the grid and the cathode will be described.

First, in the spacer method as shown in FIG. 1, a first grid G, a second grid G2, a third grid G3, and a fourth grid 04 are placed on a supporting material M made of an insulating material such as beet glass. In the bead mounts GA which are fixed at predetermined intervals in sequence, the cathode K is fixed with the tip thereof protruding by a predetermined distance A from the end face of the support plate J made of an insulating material, and this support plate J is attached to the first grid G, The first grid G. is inserted through a spacer S having a predetermined dimension B, and the ring R is pressed against the outer surface of the support plate J. Served as a customer for Toring R, and served as the first grid G. The gap C between the cathode K and the cathode K is precisely set and fixed.

However, this method has a complicated structure and a large number of parts, which increases costs.Also, while the base plate J is made of an insulator, the base plate S and cathode K used for positioning are made of metal. As a result, the thermal expansion coefficients are different, and the cathode K becomes hot during actual use, so there is a drawback that the dimensions between the first grid C and the cathode K are not constant. Moreover, as shown in FIG. 2, the air microphone can be used without using a support plate or a spacer to fix the cathode. There is also a method using Mayu. This method is based on the fourth model of Peadmount GA.
Insert the air nozzle N from the grid ○4 side, place the stepped portion Na at the tip of the air nozzle N on the inner surface of the second grid G2, and insert the pongee diameter portion Nb at the tip of the air nozzle N from the second grid G2 to the inner surface of the second grid G2. 1 grid G, and bring the cathode K close to the first grid G, and then open the air nozzle N.
The distance D to the tip of the cathode K is read using an air micrometer, the cathode K is positioned, and the cathode K is welded and fixed to the holder. In this case, by accurately determining the dimension E from the tip of the air nozzle N to the stepped portion Na, the dimension E+D can be accurately determined. However, this method ignores the variation in dimensions between the first grid G and the second grid G2 and accurately determines the interval between the second grid G2 and the cathode K.
If the distance between the grid G and the second grid G2 is greatly deviated, the product will be defective. The purpose of the present invention is to replace the conventional air micrometer etc. for fine adjustment of the gap between the electrodes when indirectly setting the gap between the electrodes to a predetermined size in those who assemble the electron gun of a cathode ray tube. An object of the present invention is to provide an assembly device that enables the use of a mechanical micrometer that is easy to handle and has excellent reliability, and thereby has excellent handling and productivity, and can maintain the production of high-quality products. An embodiment of the present invention will be described below with reference to FIGS. 3 to 7, and parts related to the conventional apparatus will be described with common names. First, the main structure of the device will be explained with reference to FIG. 3, which shows the entire device from the rear diagonally upper part, and FIG. 4, which shows the external part. In the figure, reference numeral 30 denotes a pedestal that supports the entire apparatus, and an auxiliary pedestal 31 is provided at the rear thereof, and an electric motor 32 is provided here to apply operating force to each mechanism on the pedestal 30 by means of a belt, a pulley, or the like. Next, the main parts will be explained with reference to FIG.
A cathode support cylinder 10 which is iron-coupled with the cathode K is used for coupling with the cathode K. In addition, although the cathode K is drawn larger than the power sword support cylinder 10 in FIGS. 4 to 6, this is to show the inside of the cathode K in detail, and in reality, it is drawn as shown in FIG. 7. In addition, the cathode K is smaller than its support cylinder 10 and is iron-coated therein. Reference numeral 33 denotes a movable table, which is provided on the pedestal 30 and is configured to be movable in the left-right direction in the drawing.

This moving table 33 has a moving stopper 34 attached to its left side in the drawing, and an auxiliary table, that is, a beat mount holding table 36, which is driven in the same direction as the main body 33 by an adjustment bolt 35, is movably provided on its upper surface. . 36a is a beat mount holding stand that is fixed to the auxiliary stand 36 with a steel plate, and the main body 3 is
Move in the same direction as 3.

A through hole 36b is bored through the bead mount holding base 36a, and the tip thereof faces the right end of a reference rod 38, which will be described later. Further, the rear end of the through hole 36b is connected to an air micrometer 36d via a connecting pipe 36C. 37 is a beat mount held by this auxiliary stand 36, and as shown in the figure, the cathode support cylinder 10, first, second, third, and fourth grids G. , G2, G3, and G4, respectively.

Reference numeral 38 denotes a reference rod having a reference length L, and in the drawing, the right end has a groove 38a with a depth equal to the desired gap ○, /K.
As shown in FIG. 4, a lever 39 is supported near the free end of a lever 39 which is supported by a frame 301 so that it can be rolled around, as shown in FIG.

This reference rod 38 is always connected to each of the grids G,
~G4 and the cathode K disposed opposite thereto, and can be removed from this axis by rotating the lever 39, if necessary. The collet chuck has a 40' tapered outer shape, and its small diameter part is located inside the cathode K. It is a collet chuck that serves as a fixed support base, and is made of an elastic material. A nozzle 41 having an external shape is attached so as to be movable in the direction of the ball.

The small portion of this collet chuck 40 is always inside the cathode K, and if necessary, its outer shape is expanded by moving the tapered nozzle 41 provided at the center of the collet to the right in the figure. It is held in pressure contact with the inner surface of the cathode K. Further, as shown in FIG.
5 and lotus are suitable. On the other hand, the movable table 33 is placed on the pedestal 30.
A fixed topper 46 is provided on the left side in the figure, facing the movable stopper 34 provided in the figure.

Reference numeral 47 denotes a stop rod having a predetermined length, which is always located between the fixed stopper 46 and the movable stopper 34 in a state parallel to the axis line, and is attached to the pedestal 30 so as to be removed from the tracking line as necessary. On the lifting platform 48 that can be lowered below the
These are supported by iron joints that are movable in the axial direction.

Further, the lifting platform 48 has a groove 49 on its upper surface as shown in FIG.
If necessary, a reference gauge 50 having a length L equal to the reference rod 38 is attached to a fixed stopper 46.
and the movable table 38 in a state parallel to the axis. Reference numeral 61 denotes a second moving stopper provided on the moving table 33, which is located on the same axis as the reference gauge 50 that has been rebuilt on the lifting table 49, and is supported so as to be movable in the axial direction with respect to the moving table 33. Ru.

Reference numeral 52 denotes a mechanical side length means, such as a known mechanical micrometer, which is provided on the movable table 33, and its measuring rod, ie, spindle 52a, is moved in and out of the main body by rotating a turning wheel 52b on the right side in the figure. Said second stopper 51
This is connected to the ball and driven in the direction of the ball.

Reference numeral 53 denotes a lock bolt that allows movement of the second stopper 51 at all times, but when tightened, prevents this movement and fixes the second stopper 51 to the movable table.

Next, the operation when assembling the electrode section using the assembly apparatus having the above configuration will be explained.

In FIG. 4, the movable table 33 has its movable stopper 34 in contact with the fixed stopper 46 via the stop rod 47, and therefore stops at a position separated by the length of the stop rod 47 from the right side of the fixed stopper 46. are doing.

At this time, the cathode support cylinder 10 supported by the beat mount 37 with a predetermined gap and each grid G, ~
In G4, the left end surface of the first grid G in the drawing comes into contact with the right end surface of the reference rod 38 as the moving table 33 moves to the left in the drawing and drives it in the same direction, thereby stopping the moving table. Accordingly, the reference rod 38 stops when the right end surface maintains a distance of 1 from the cathode K. In this state, a reference gauge 50 having a length L equal to that of the reference rod 38 is placed on the upper surface of the lifting platform 48, and the micrometer 52 is operated to send out the second stopper 51, so that the tip thereof faces the end surface of the reference rod 50. When it comes into contact with the fixed stopper 46 and stops at a position where the length L is maintained from the fixed stopper 46, read the scale of the micrometer at this time.

Next, the reference gauge 50 is removed from the lifting platform 48, and then,
By operating the micrometer 52, the tip of the second stopper 51 is further adjusted to a predetermined dimension from the above state, that is, the first grid G,
The second stopper 51 is fixed to the movable table 33 by the distance G, /K between the second stopper 51 and the cathode K, and then the lock bolt 53 is tightened. Such operations only need to be performed once and do not need to be performed during normal work.

After setting the dimensions G and /K in this way, next operate the solenoid valve 42, etc. as shown in FIG.
A gas such as air or nitrogen is blown out, and the cathode K is driven from the position shown by the broken line to the reference rod 1 shown by the solid line.
Move it a distance of 1 until it touches the left end of 4.

Normally, the distance 1 that the cathode K is pushed by the gas is 0.2
Since the air pressure is about 0.5 k9/m and the gas pressure is about 0.5 k9/m, there is no manipulation that would damage the electron emitting surface of the cathode K.
Here, the distance 1 is the adjustment bolt 35 on the moving table 33,
Further, the gas pressure can be adjusted using a pressure reducing valve 43, and can be adjusted in advance so as not to damage the electron emitting surface. After the cathode K contacts the left end of the reference rod in this manner, the nozzle 41 is advanced to the right in the figure by a cam mechanism or the like (not shown) to spread the collet chuck 40 apart. For this reason, the outer surface of the small diameter portion of the collet chuck 40 comes into pressure contact with the inner surface of the cathode K, as shown in FIG. 6, and holds this. After this, a groove 38 with depths G and /K is provided from the tip of the bead mount holding base 37 to the right end of the reference rod 38.
The distance 6 to the bottom surface of a is measured using the air micrometer 36d. In this case, it is sufficient to simply read the position of the float 36e of the air micrometer 36d. That is, this operation is to confirm whether the gaps ◯ and /K are within a predetermined dimension when fixing the cathode K and bead mount 37, which will be described later. However, this confirmation operation may be performed after fixing the cathode K and the bead mount 37, and in this case, it also serves as a dimension inspection of C and /K. After the holding of the cathode K is completed, the moving table 33 is temporarily retreated to the right in the figure.

At this time, the reference rod 38 is moved upward by the rotation of the lever 39, and the stop rod 47 is moved downward by the elevator table 48. After this movement is completed, the moving table 33
is driven to the left in the figure until the second moving stopper 51 comes into contact with the fixed stopper 46 and stops, as shown in FIG. As a result of this movement, as shown in Fig. 7, the cathode support cylinder 1 is iron-coupled with the cathode K.
Further, the first grid G is positioned with a gap Δ maintained between the end face of the cathode and the end face of the cathode.

Here, the gap △ is calculated using the formula △=L-(L-G,/K)=○,/
As is clear from K, G, /K is equal to G, /K, and the cathode K and the first grid G, are arranged with a predetermined gap ○, /K maintained, and the cathode support cylinder 10 and cathode K are connected by welder 6. Weld and complete assembly work. In the above embodiment, when the cathode is loosened from the end face of the reference rod, gas pressure is used. However, since the material composing the cathode is a magnetic material, a magnetic field is applied to the reference rod to loosen the cathode K. The reference rod may be configured to be in close contact with the left end of the reference rod. As described above, according to the present invention, one electrode, that is, the cathode, is supported in a fixed state, and the other electrode, that is, the cathode, is supported in a fixed state.
That is, the first grid is movably supported by a movable table,
Initially, a reference rod of a predetermined length is used to oppose the cathode and the first grid with a distance equal to the length of the reference rod, and at the same time, a reference gauge having the same length as the reference rod is used to connect the cathode to the first grid. First, a reference moving distance is set, and then, corresponding to a predetermined distance between the cathode and the first grid in the assembled state, the moving distance of the moving table is changed from the reference value to, for example, a mechanical micrometer. The final moving distance is set using a meter and a moving stopper linked thereto, and the moving table is moved by this moving distance based on the difference between the length of the reference rod and the final moving distance. One grid is roughly set up at a predetermined interval, and the structure is such that it is possible to confirm the predetermined gap between the cathode and the first grid before fixing it, or to inspect the dimensions after fixing, which makes it possible to perform a conventional air micro. Compared to the above, if the moving distance of the moving table is set in advance, there is no need to adjust the assembly gaps ○, /K for each cathode assembly, and the gaps G, /K can be set mechanically. utilization will increase and production productivity will improve.

Moreover, since it is possible to check within the same device whether the gaps ○, /K are within a predetermined size after fixing or fixing the cathode and the first grid, it is possible to obtain an electron gun with a guaranteed duty of 8. Further, since the mechanical side length means makes it possible to use a mechanical micrometer, the trouble of measuring with an air micrometer is eliminated. Furthermore, it has various advantages such as being able to easily adapt to changes in the gaps ○ and /K in a short period of time.

[Brief explanation of the drawing]

1 and 2 are structural diagrams showing a conventional device, FIG. 3 is a perspective view of the entire embodiment of the cathode ray tube electrode assembly device according to the present invention, seen from diagonally above the rear, and FIG. Fig. 3 is a partially cutaway side view illustrating the main constituent parts, Fig. 5 is a sectional view showing a part of Fig. 4, and Fig. 6 shows another state of Fig. 5. The sectional view shown in FIG. 7 is a partially cutaway side view showing another state of the main component shown in FIG. 4. 30... Frame, 33... Moving platform, 34,5
1...Moving stopper, 36d...Air micrometer, 37...Beam mount, 38...
...Reference rod, 38a...Groove having a predetermined depth, 40...Collection chuck as a fixed support, 46...Fixed stopper, 50...Reference gauge, 52 ...Mechanical micrometer. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A pedestal, a fixed support pedestal fixedly provided on the pedestal for supporting one of the electrodes to be assembled, and a pedestal located opposite to the fixed support pedestal and having a through hole along the axis thereof. a movable table that is movably provided and supports the other electrode to be assembled; an air micrometer that is connected to the rear end of the through hole and that measures the length by supplying gas to the through hole; a groove having a depth of a predetermined gap with a bottom portion that blocks the gas, and is located on the axis connecting the electrodes supported by the fixed support table and the movable table; When at a certain stop position, one end contacts the electrode on the movable table side and the other end maintains a gap with the electrode on the fixed support table side, and can be removed from the axis line as necessary and is located on the axis line. A detachable rod having the same length as a reference rod that brings the electrode supported by the fixed support into contact with its end face, and is provided between the movable base and a fixed stopper formed on the pedestal at the stop position of the movable base. a freely movable reference gauge; a mechanical micrometer attached to the movable base and having a spindle disposed coaxially with the axis of the reference gauge; and a spindle portion of the micrometer movably attached to the movable base. is connected to and driven by a micrometer, contacts one end of the reference gauge at the stop position of the movable stage, reads the contact position with the reference rod, and after the reference gauge is removed, a predetermined gap is generated when assembling the two electrodes. a moving stopper that moves further from the reading position to narrow the length of the reference gauge; and after the moving stopper finishes setting the gap between the two electrodes, the reference rod is removed from the axis and the moving stage is moved. and bringing the end of the movable stopper into contact with the fixed stopper, thereby assembling the two electrodes so that they face each other with the predetermined gap maintained and the two electrodes are fixed to each other. Electrode assembly equipment for cathode ray tubes.