JPH02242546A - Electron gun spanset device - Google Patents

Abstract

PURPOSE:To make it possible to insert a cathode smoothly into an eyelet by holding the cathode by the attraction of a cathode holder and moving the cathode by the distance between the cathode holding center and a detection rod center. CONSTITUTION:Because a cathode holder 4 provided with a detection rod 11 as an integral part of the cathode holder 4 is capable of freely moving in the X-Y directions, the cathode holder 4 causes a cathode 7 to shift by the amount of shift of the detection rod 11 when the detection rod is inserted into an eyelet 13. The cathode holder 4 holds the cathode 7 by attraction and the cathode holder 4 is locked with locking means to a holder support member 1. The holder support member 1 shifts toward the eyelet 13 by the distance between the center of a cathode holding section 4b and the center of the detection rod 11. As a result, the cathode 7 is located just above the eyelet 13 and aligned with the center of the eyelet 13. When the holder support member 1 or the cathode holder 4 is lowered, the cathode 7 is smoothly inserted into the eyelet 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a first grid (a first grid) in which a cathode is positioned to a predetermined dimension and assembled by a span cell l-device (which is connected to this) in the assembly of an electron gun for a cathode ray tube. , particularly the cathode insertion mechanism for inserting the cathode into the eyelet.

[Conventional technology]

An example of an assembly apparatus for use in assembling an electron gun for a cathode ray tube is disclosed in Japanese Patent Application Laid-Open No. 53-47264.

Although different from the device shown in the above-mentioned publication, the cathode insertion mechanism of the conventional span setting device includes an electrode structure holder that holds an electrode structure in which an eyelet is incorporated together with an electrode, and a cathode insertion mechanism provided near the electrode structure holder, It has a cathode holder on which the cathode is placed, and a cathode holder that suctions and holds the cathode and transfers it. Therefore, the cathode on the cathode holder is suction-held by a cathode holder and transferred above the eyelet, and the cathode holder is lowered to insert the cathode into the eyelet.

[Problem to be solved by the invention]

In the above prior art, the eyelet is positioned at the ideal center, and the cathode holding portion of the cathode holder holding the cathode is inserted in the ideal center of the eyelet.

If the center of the eyelet is misaligned, there is a problem that the cathode or the eyelet is damaged when the cathode is inserted, and the span setting accuracy is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a span setting device for an electron gun that can smoothly insert a cathode into an eyelet.

[Means to solve the problem]

In order to achieve the above purpose, a detection rod is attached to the cathode holder and inserted into the eyelet of the electrode structure held on the electrode holding base, and the cathode holder is supported so as to be freely movable in the XYX directions, and a holder support member provided to be reciprocatable by a distance between the center of the cathode holding part of the cathode holder and the center of the detection rod, and a locking means for locking the cathode holder to the holder support member ζ. be.

[Effect]

When the holder support member is lowered, the cathode holder and the detection rod are lowered together, the cathode holding portion of the cathode holder is inserted into the cathode, and the detection rod is inserted through the eyes.

By the way, the cathode holder with the detection rod attached is
It is designed so that it can move freely in the Y and X directions (so that when the detection rod is inserted into the eyelet as described above, when it comes into contact with the eyelet, it moves along the eyelet and is inserted into the eyelet. As a result, the cathode holder integrated with the detection rod also moves the cathode by the amount of the moving lid of the detection rod.

Next, the cathode holder attracts and holds the cathode, and the cathode holder is locked to the holder support member ζ by the locking means. After that, the holder support member rises, and then the holder support member moves in the direction of the eyelet by the distance between the center of the cathode holding part of the cathode holder and the center of the detection rod. As a result, the cathode is positioned directly above the eyelet and coincides with the center of the eyelet. When the holder support member, that is, the cathode holder is lowered in this state, the cathode is smoothly inserted into the eyelet.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. A shaft 2 disposed in the X direction is fixed to a holder support member l that is moved up and down and in the X and Y directions by a drive means (not shown). A cathode holder 4 is provided on the shaft 2 via a bearing 3 so as to be rotatable and slidable along the shaft 21 .

The upper end portion of the cathode boulder 4 is a circular arc 4 centered on the axis 2.
The holder supporting member 1 is provided with a piston 5 which is movable up and down and is actuated by air pressure, corresponding to the upper end ζ of the circular arc 4a. A plate spring 6 having one end fixed to the holder support member 1ζ is disposed between the piston 5 and the cathode holder 4. The lower end of the cathode holder 4 is a cathode holding part 4b that is inserted into the can door.
A vacuum port 4C for holding the can door by vacuum suction is provided on the side surface of the cathode holding portion 4b. A cathode holder, which can freely move in the XYX directions, is mounted on a stand 8ζ on the can door.

An arm 9 is fixed to the cathode holder 4, and a detection rod 11 is connected to the end of the arm 9 via a bearing 10.
It is provided so as to be able to freely slide downward. The detection rod 1 is urged downward by a leaf spring 12 whose one end is fixed to the arm 9, and the tip of the detection rod 11 is formed with a tapered portion 11a so that it can be easily inserted into the eyelet 13. The eyelet 13 is assembled together with an electrode (not shown) to form an electrode structure, and is held on an electrode structure holder (not shown).

Next, the operation of aligning and assembling the can door with the eyelet 13 will be explained. When the holder support member 1 is lowered by a driving means (not shown), the tip of the detection rod 11 is inserted into the eyelet 13 (the cathode holding portion 4b of the cathode holder 4 is inserted into the can door).

Now, in the state before the holder support member 1 is lowered,
As shown in FIG. 3, it is assumed that the center of the eyelet 13 is shifted to P' (Px, Py) with respect to the center P of the detection rod 1. As mentioned above, since the cathode holder 4 is rotatably provided on the shaft 2 and slidably on the shaft 2 (in the x direction), the holder support member 1 is lowered to detect the tapered portion 11a of the detection rod 1. When the contact point 11a of the detection rod 11 contacts the eyelet 13, the cathode holder 4 moves along the axis 2 to Px so as to follow the hole of the eyelet 13.
It also rotates around axis 2 and moves by py. That is, the tapered portion 11al-1 of the detection rod 11
It moves to the center P' of the eyelet 13 and is inserted into the eyelet 13. In this case, the tip of the detection rod 11 is rotated by py and inserted into the eyelet 13, so the detection rod 11 is slightly tilted. However, P P' is very small at about 0.2 to 0.3, and the length from the axis 2 to the tip of the detection rod 11 is very large compared to the distance Py, so the inclination of the detection rod 11 is is very small and does not pose a problem.

When the detection rod 11 is positioned at P'' as described above, the cathode holder 4 integrated with the detection rod 11 also moves from point Q to Q' (
Qx, Qy), and the amount of deviation is QxPx,
Qy = Py. In this case, the cathode holder is placed on stand 8.
is moved together with the cathode holder 4.

Next, the lever piston 5 operates and locks the cathode holder 4 via the leaf spring 6. In this case, unlike the embodiment, if the pressing force of the piston 5 is not directly transmitted to the cathode holder 4 (but is transmitted via the leaf spring 6), only the pressing force of the piston 5 is transmitted to the cathode holder 4, so that the piston 5
The influence of movement in the two axis directions disappears.

Next, the vacuum port 4C of the cathode holder 4 is vacuum-suctioned, and the can door is vacuum-adsorbed onto the cathode holding portion 4bζ. Thereafter, the holder support member 1 rises, and the cathode holder 4 holds the cathode 7 and rises. Next, holder support member 1
is moved by a distance a from the center of the cathode holding part 4b to the center of the detection rod 11, the center of the can door is located directly above the center of the eyelet 13, and the can door and the eyelet 13 are the same. Located on the center line. after that,
When the holder support member 1 is lowered, the cathode 7 is inserted into the eyelet 13.

In the above embodiment ζ, the movement of the cathode holding part 4b of the cathode holder 4 and the tip of the detection rod 11 in the Y direction is obtained by the rotation of the cathode holder 4. XY relative to holder support member 1
It may also be moved in a plane in the direction.

〔Effect of the invention〕

According to the present invention, by inserting the detection rod around the eyelet ζ, the relative position of the cathode with respect to the eyelet ζ is corrected. When the cathode holder is moved by the distance from the center of the cathode to the center of the eye, the centers of the cathode and eye 1/to coincide. As a result, the cathode is smoothly inserted into the eyelet, damage to the cathode and eyelet is prevented, and span setting accuracy is improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The side view of the figure is a partially sectional view, and FIG. 3 is an explanatory view of the operation. ■...Holder support member, 2...Shaft, 3
... Bearing, 4... Cathode holder, 4b.
... Cathode holding part, 5... Piston,
7...Cathode, 8...Cathode holder is stand, 1
1...Detection rod, 13...Eyelet. Figure Figure 1; 14 Rezuto

Claims (1)

[Claims] 1. An electrode structure holding stand that holds the electrode structure in which the eyelet is incorporated together with the electrode, a cathode holder provided near the electrode structure holding stand on which the cathode is placed, and a cathode that holds the cathode by suction and transports it. holder, in which the cathode is inserted into the eyelet and positioned relative to the first grid; A detection rod to be inserted and a holder that supports the cathode holder so as to be freely movable in the X and Y directions and is movable up and down and reciprocated by a distance between the center of the cathode holding part of the cathode holder and the center of the detection rod. A span setting device for an electron gun, comprising: a support member; and a locking means for locking the cathode holder to the holder support member.