JPH029418B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a positioning device for an electron gun.

[Technical background of the invention and its problems]

In the manufacture of cathode ray tubes, the sealing process is the process of assembling the electron gun to the bulb, and is considered an extremely important process because the relative positional accuracy of the bulb and electron gun at this time greatly affects the quality of the cathode ray tube. . In this case, the sealing device automatically holds the supplied electron gun in a predetermined position and assembles it to the valve.
Because it is necessary to position the electron gun in the rotational direction, it is not possible to automate the supply of the electron gun.
The supply and positioning of the electron gun, as well as the bending inspection of its terminal pins, were performed manually.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to automatically perform rotational positioning of an electron gun and pin bending inspection using a simple device.

[Summary of the Invention] The electron gun positioning device of the first invention includes a rotating body that rotates around a horizontal axis, and a positioning device that protrudes from the rotating body in a direction perpendicular to the central axis of the rotating body, and a positioning device for an electron gun. and a cylindrical body into which an exhaust pipe is rotatably fitted, and the exhaust pipe is fitted into the cylindrical body when the cylindrical body is rotated from a horizontal state to an upright state by rotation of the rotating body. It is characterized in that the weight of the getter part provided at the eccentric position causes the getter part to face downward in a predetermined direction.

The electron gun positioning device of the second invention includes a rotating body that rotates around a horizontal axis, and an exhaust pipe of the electron gun that is protruded from the rotating body in a direction perpendicular to the central axis of the rotating body. A rotatably fitted cylinder, a straight part provided parallel to the central axis of the cylinder at the tip of the cylinder and engaged with the terminal pin of the electron gun, and a straight part that gradually connects to the tip of the straight part. an electron gun comprising a plurality of pin engagement holes each having a tapered portion whose diameter increases, and an exhaust pipe is fitted into the cylindrical body when the cylindrical body rotates from a horizontal state to an upright state due to rotation of the rotating body; The weight of the getter part provided at the eccentric position causes the getter part to face downward in a predetermined direction, and when the cylinder approaches an upright position, the weight of the electron gun holds the terminal pin in a predetermined position. It is characterized in that it fits into the pin engagement hole and engages with the straight portion via the tapered portion.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electron gun positioning device of the present invention will be specifically described based on embodiments shown in the drawings.

First, the general structure of an electron gun will be explained.

As shown in FIG. 1, an electron gun 1 has components 2 such as heaters and electrodes fixed with bead glasses 3 at predetermined intervals, and getters 4 attached to the tips of these components.
The getter 4 is eccentrically attached to one side of the convergence cup 6 at the distal end via a curved leaf spring 7, and the getter 4 is attached eccentrically to the stem 5. An exhaust pipe 8 is provided, and a plurality of terminal pins 9 are provided around the exhaust pipe 8.

As shown in FIGS. 2 and 3, the positioning device for the electron gun 1 includes a motor 12 mounted on the substrate 11.
At the same time, a drive mechanism 14 is provided above the motor 12 via a support stand 13, and these motors 12 and drive mechanism 14 are connected by a transmission mechanism 15 consisting of a belt, a pulley, etc. A turret 17 as a rectangular prism-shaped rotating body is coaxially attached to the horizontal output shaft 16, and a plurality of gauging chips 18 as cylindrical bodies are oriented on each of the four sides of the turret 17 in a direction perpendicular to the central axis of the turret 17. It is a projecting structure.

Each gauging chip 18 has a fourth gauging chip 18.
As shown in Fig. 5, the electron gun 1 is placed in the center of the
It has a support hole 21 in which the exhaust pipe 8 of the electron gun 1 is loosely fitted and rotatably supported, and a straight part 22 that engages with the terminal pin 9 of the electron gun 1 and a straight part 2 at the tip thereof are provided.
A tapered part 2 that gradually expands in diameter after being connected to the tip of 2.
A plurality of pin engagement holes 24 consisting of 3 are formed around the support hole 21 in parallel with the support hole 21 in correspondence with the terminal pins 9.

Further, one pin engaging hole 24a among the plurality of pin engaging holes 24 has a tapered portion 23a that protrudes in the distal direction from the tapered portion 23 of the other pin engaging holes 24, and is formed to have a large diameter. has been done.

Note that the inner diameter of the straight portion 22 of each pin engagement hole 24, 24a is such that if each terminal pin 9 of the electron gun 1 is bent beyond the allowable range, the terminal pin 9 may be caught in the middle, and the terminal pin may be bent. The tip portions of the pins 9 are sized so that they do not reach the bottoms 25 of the pin engagement holes 24, 24a.

Next, the operation will be explained.

A tray 27 containing a large number of electron guns 1 is placed on the left side of the turret 17, and the electron guns 1 in the tray 27 are taken out by a pick-up device (not shown) and each gauging chip 18 is placed in a horizontal state facing left. The tip of the exhaust pipe 8 of the electron gun 1 is fitted into the support hole 21 . At this time, the terminal pin 9 of the electron gun 1 and the pin engagement hole 24 of the gauging chip 18 are kept apart.

When the exhaust pipe 8 of the electron gun 1 is fitted to all of the gauging chips 18 facing left, the transmission mechanism 15 and the drive mechanism 14 are driven by the motor 12.
The turret 17 is rotated 90 degrees clockwise via. Note that this 90-degree rotation is such that the first 60 degrees are relatively fast, and the last 30 degrees are relatively slow.

This rotation causes each gauging chip 18 supporting the electron gun 1 to rotate from a horizontal position to an upright position. During this period, especially the first 60 degrees, the device rotates at a fast speed to shorten the indexing time of the entire device. When the angle reaches approximately 60 degrees, the electron gun 1 starts to fall due to its own weight and is rotated and oriented due to the weight of the getter 4 so that the getter 4 is directly below. As it continues to rotate further and approaches a nearly vertical state, the electron gun 1 is completely lowered, and each terminal pin 9 is inserted into the corresponding predetermined pin engagement hole 24, 24a.
The straight portions 22, 22a are engaged with the straight portions 22, 22a via the tapered portions 23, 23a, and are completely oriented in a predetermined direction.

In this case, the tapered part 23a of one pin engaging hole 24a is connected to the tapered part 2 of the other pin engaging hole 24.
Since the diameter is larger than that of 3, even if the direction restriction due to the weight of the getter 4 is deviated by the angle θ in both directions, the tapered portion 23a can guide the getter in a predetermined direction, as shown in FIG. Positioning can be done reliably.

Furthermore, at this time, if the terminal pin 9 of the electron gun 1 is bent beyond the allowable range, the terminal pin 9 will not reach the bottom 25 of the pin engagement holes 24, 24a,
If the pin is significantly bent, the terminal pin 9 will stop at the entrance of the straight section 22, causing the electron gun 1 to be slightly lifted from the gauging chip 18. If this is detected, the terminal pin 9 can be inspected for bending. For example, as shown in FIG. 3, by detecting the position of the upper end of the convergence cup 6 with the photoelectric detectors 28a and 28b, a defective electron gun 1 with a bent terminal pin 9 can be detected.

After the rotational positioning of the electron gun 1 and the bending test of the terminal pin 9 are completed, the robot chuck 29 of the sealing device sequentially removes the good electron guns 1 from the gauging chip 18 and transports them to the sealing device. It's summery.

During this time, the electron gun 1 in the tray 27 is fitted into each gauging chip 18 which is now in a horizontal state.

Then, when a good electron gun 1 is removed from each gauging chip 18 in the upright state, the turret 17
is rotated 90 degrees clockwise again, and the positioning of the electron gun 1 and the bending test of the terminal pin 9 are performed.

In addition, in this state, if the electron gun 1 was determined to be a defective product in the previous bending test of the terminal pin 9 and was left in the gauging chip 18, this defective electron gun 1
Due to the rotation of the turret 17, it is in a horizontal state facing to the right, and in this position it is removed from the gauging chip 18 by a removal device (not shown), placed on the conveyor 29, and carried out by the conveyor 29. It is becoming more and more like this.

〔Effect of the invention〕

As described above, according to the present invention, when positioning the electron gun in the rotational direction, the eccentricity of the electron gun can be adjusted simply by rotatably supporting the exhaust pipe of the electron gun on the cylinder and raising it from a horizontal state to an upright state. The weight of the getter section provided at the position allows the electron gun to be directed in a predetermined direction.

If the terminal pin of the electron gun, which descends due to its own weight in an upright state, is fitted into the pin engagement hole of the cylinder, the positioning accuracy of the electron gun can be made extremely high. It is also possible to test the bending of the terminal pins of the electron gun at the same time.

Furthermore, these devices have a simple structure and only rotate, so they are easy to manufacture and require little maintenance. Furthermore, the electron gun can be inserted into these devices by simply connecting the exhaust pipe to the cylinder. Since all that is required is mating, automation is possible, and the insertion and positioning of the electron gun, as well as the bending inspection of the terminal pins, can be performed completely automatically.There is no reduction in yield due to operator errors, and the quality of cathode ray tubes is improved. Can be done.

[Brief explanation of drawings]

Fig. 1 is a side view of the electron gun, Fig. 2 is a perspective view of the electron gun positioning device of the present invention, Fig. 3 is its side view, Fig. 4 is a front view of its main parts, and Fig. 5 is its FIG. 3 is a cross-sectional view of main parts. DESCRIPTION OF SYMBOLS 1... Electron gun, 4... Getter, 8... Exhaust pipe, 9... Terminal pin, 17... Turret as a rotating body, 18... Gauging chip as a cylindrical body, 22... Straight section, 23, 23a...Tapered portion, 24, 24a...Pin engagement hole.

Claims (1)

[Scope of Claims] 1. A rotating body that rotates about a horizontal axis, and an exhaust pipe of an electron gun that protrudes in a direction perpendicular to the central axis of the rotating body and is rotatably fitted to this rotating body. and a cylindrical body, and when the cylindrical body is rotated from a horizontal state to an upright state by rotation of the rotary body, an electron gun having an exhaust pipe fitted to the cylindrical body is moved to a getter portion provided at an eccentric position. A positioning device for an electron gun, which is characterized by being oriented in a predetermined direction by weight. 2. A rotating body that rotates about a horizontal axis, a cylinder that protrudes from the rotating body in a direction perpendicular to the central axis of the rotating body and into which the exhaust pipe of the electron gun is rotatably fitted, and this cylinder. A plurality of pin engagement holes consisting of a straight part provided parallel to the central axis of the cylindrical body at the tip of the body and engaging with a terminal pin of the electron gun, and a tapered part connected to the tip of this straight part and gradually increasing in diameter. When the cylindrical body is rotated from a horizontal state to an upright state due to the rotation of the rotating body, the electron gun with the exhaust pipe fitted to the cylindrical body is moved by the weight of the getter part provided at an eccentric position. A positioning device for an electron gun, characterized in that when the cylindrical body approaches an upright state in a predetermined direction, the weight of the electron gun causes the terminal pin to fit into a predetermined pin engagement hole. 3. Claims characterized in that one of the plurality of pin engagement holes has a tapered portion that protrudes in the distal direction and has a larger diameter than the tapered portion of the other pin engagement holes. 2. The electron gun positioning device according to item 2.