JPH0721917A - Manufacturing device and method for cathode-ray tube - Google Patents

Abstract

PURPOSE:To confirm the curve of an air blow nozzle without sacrificing safety during production, and to eliminate defective voltage resistance. CONSTITUTION:A manufacturing device of a cathode-ray tube is provided with a neck contact detection means 17 consisting of a power source 20 for letting current run in the cavity 2b of a cathode-ray tube 2 and a detector 21 for detecting whether current runs in an air blow nozzle 6 or not. The curve of the nozzle is automatically controlled constantly and the safety is improved and defective voltage resistance is prevented while the frequency of defective implosion is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube manufacturing apparatus and method, and more particularly to a tube foreign matter removing apparatus and method.

[0002]

2. Description of the Related Art In the process of manufacturing a cathode ray tube, there is a foreign matter removing step in the tube in order to reduce the withstand voltage defect due to the foreign matter in the tube. The foreign matter in the tube is removed by inserting an air blow nozzle into the tube and vibrating the Braun tube to the outside. That is, the foreign matter floating due to the vibration is easily blown out by the air blow by the air blow nozzle, and the foreign matter is completely removed from the inside of the pipe.

By the way, when the air blow nozzle is bent and inserted when the air blow nozzle is inserted into the pipe,
If the tip portion of the air blow nozzle scrapes off the graphite applied to the inside of the tube, it may cause a withstand voltage failure. Therefore, conventionally, in order to prevent defective withstand voltage due to bending of the air blow nozzle,
Visual inspection is conducted once a week.

[0004]

Since the above-mentioned prior art is a visual inspection once a week, even if the air blow nozzle bends during production, it cannot be confirmed, and a withstand voltage defect due to the air blow nozzle bend occurs. There was a problem. In addition, visual inspection work during operation of the device is dangerous and cannot be inspected.

An object of the present invention is to provide a cathode ray tube manufacturing apparatus and manufacturing method capable of confirming the air blow nozzle bending without sacrificing safety during production and eliminating defective withstand voltage.

[0006]

A first apparatus of the present invention for achieving the above object is a cathode ray tube manufacturing apparatus for removing foreign matters in a tube by inserting an air blow nozzle into the tube. It is characterized by comprising a neck contact detection means composed of a power supply for supplying a current to the air blow nozzle and a detector for detecting whether or not a current flows through the air blow nozzle.

A second apparatus of the present invention for achieving the above object is a cathode ray tube manufacturing apparatus for inserting an air blow nozzle into a tube of a cathode ray tube to remove foreign matters in the tube. Nozzle bend detection consisting of a limit gauge with a gap within the permissible range of nozzle bend to the outer circumference of the air blow nozzle, a power supply that supplies current to this limit gauge, and a detector that detects whether or not current flows to the air blow nozzle It is characterized by having means.

A first method of the present invention for achieving the above object is a method for manufacturing a cathode ray tube in which an air blow nozzle is inserted into a tube of a cathode ray tube to remove foreign matters in the tube, after the air blow nozzle is inserted into the tube. The method is characterized in that an electric current is passed through the cavity of the cathode ray tube, and whether or not the electric current is passed through the air blow nozzle is detected.

A second method of the present invention for achieving the above object is a method for manufacturing a Braun tube in which an air blow nozzle is inserted into the tube of the Braun tube to remove foreign matters in the tube, and the nozzle is bent with respect to the outer periphery of the air blow nozzle. A limit gauge having a clearance within the permissible range is provided on the outer circumference of the air blow nozzle, and a current is passed through the limit gauge.
It is characterized by detecting whether or not this current flows through the air blow nozzle.

[0010]

According to the above first apparatus and method, when a current is passed through the cavity of the cathode ray tube, this current flows through the graphite inside the tube. Therefore, when the air blow nozzle is in contact with the neck portion of the cathode ray tube, the current flowing through the graphite flows through the air blow nozzle. Therefore, nozzle bending can be detected by detecting whether or not a current flows through the air blow nozzle.

According to the second device and method, when the bending of the air blow nozzle exceeds the allowable range, the air blow nozzle contacts the limit gauge. Therefore, nozzle bending can be detected by detecting whether or not a current flows through the air blow nozzle.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. First, the configuration of the in-pipe foreign matter removing device will be described.
A tapping mechanism 3 for vibrating the cathode ray tube 2, a holder 4 for holding the cathode ray tube 2, and a positioning holding means 5 for positioning and holding the neck portion 2a of the cathode ray tube 2 are provided on the upper part of the foreign substance removing apparatus main body 1. . An air blow nozzle 6 is provided inside the foreign matter removing apparatus main body 1, and a vertical moving plate 7 is provided at a lower end of the air blow nozzle 6.
Is fixed. An operating rod of an air cylinder 8 is fixed to the vertical moving plate 7, and the air cylinder 8 is fixed to a support plate 9. The support plate 9 is fixed to the bottom surface of the main body 1 of the foreign matter removing device via legs 10.

Next, the structure of the air blow nozzle bend detecting means, which is a feature of this embodiment, will be described. In the present embodiment, the nozzle bend detecting means 15 for detecting the bend of the air blow nozzle 6 before the air blow nozzle 6 is inserted into the tube of the cathode ray tube 2, and the nozzle position deviation detecting means 16 for detecting the position deviation of the air blow nozzle 6, The air blow nozzle 6 includes a neck contact detecting means 17 for detecting a bend of the air blow nozzle 6 when the air blow nozzle 6 is inserted into the cathode ray tube 2.

The nozzle bending detection means 15 has a limit gauge 18 fixed to the support plate 9, and the inner diameter of the limit gauge 18 is a ring having a clearance within the bending allowable range with respect to the outer circumference of the air blow nozzle 6. There is. A power supply 20 is connected to the limit gauge 18 so that a current flows. A detector 21 is connected to the air blow nozzle 6.

The nozzle position shift detecting means 16 has optical sensors 24, which are provided on both sides of the center of the air blow nozzle 6 and each of which includes a light projector 22 and a light receiver 23, in the X and Y directions, and the optical sensor 24 is supported. It is fixed on the plate 9.
The light receiver 23 in the X and Y directions is connected to the arithmetic circuit 25, and the arithmetic circuit 25 calculates the positional deviation amount of the air blow nozzle 6. The determination circuit 26 determines whether or not the amount of positional deviation by the arithmetic circuit 25 is within the allowable range.

The neck contact detecting means 17 is a cathode ray tube 2.
The cavity 2b has a terminal portion 27 for supplying a current from the power source 20, and the contact with the neck portion 2a is detected by the detector 21 connected to the air blow nozzle 6.

Next, the operation will be described. CRT 2
When is mounted on the holder 4, the positioning and holding means 5 operates to position and hold the neck portion 2a of the cathode ray tube 2. Next, the air cylinder 8 is activated and the air blow nozzle 6
Rises, and the tip of the air blow nozzle 6 has a cathode ray tube 2
Inserted in the tube. Then, the tapping mechanism 3 vibrates the cathode ray tube 2 to levitate the foreign matter in the tube.
Further, air blown from the air blow nozzle 6 and the foreign matter floating in the pipe is removed to the outside. After that, the air cylinder 8
Operates in the opposite direction to the above and the air blow nozzle 6 descends.

By the way, as described above, before the air blow nozzle 6 is raised, the bend of the air blow nozzle 6 is detected by the nozzle bend detecting means 15. That is, a current flows from the power source 20 to the limit gauge 18. If the bending of the air blow nozzle 6 exceeds the allowable range and is in contact with the limit gauge 18, a current flows through the detector 21, and the detector 21 determines that the nozzle is bent and a signal to stop the foreign matter removing device. Is output.

Before the air blow nozzle 6 is raised,
The nozzle position shift detection means 16 detects the position shift of the air blow nozzle 6. The light emitted from the light projector 22 is incident on the light receiver 23, and the light received by the light receiver 23 is converted into an electric signal and input to the arithmetic circuit 25. The arithmetic circuit 25 calculates the positional deviation amount of the air blow nozzle 6. It This displacement amount is determined by the determination circuit 26, and if it is above the allowable range, a signal for stopping the foreign matter removing device is output.

When the air blow nozzle 6 is inserted into the cathode ray tube 2 as described above, the neck contact detecting means 1
Bending of the air blow nozzle 6 is detected by 7.
An electric current is passed from the power source 20 to the cavity 2b of the cathode ray tube 2 through the terminal portion 27. The current flowing in the cavity 2b passes through the graphite 2c in the tube. If the air blow nozzle 6
Is in contact with the inner surface of the neck portion 2a, the current passing through the graphite 2c flows through the air blow nozzle 6 to the detector 21. Therefore, the detector 21 outputs a signal for stopping the foreign matter removing device.

As described above, in this embodiment, since the bending of the air blow nozzle 6 is automatically detected at all times before and after the air blow nozzle 6 is inserted into the cathode ray tube 2, it is excellent in safety. In addition, it is possible to eliminate defective withstand voltage due to nozzle bending. Further, it is possible to prevent an accident in which the air blow nozzle 6 hits the neck portion 2a and causes a crack, and the implosion failure is reduced.

In the above embodiment, the case where three detecting means of the nozzle bending detecting means 15, the nozzle position deviation detecting means 16 and the neck contact detecting means 17 are provided has been described, but only one of them is provided. However, the effect superior to the conventional one can be obtained. However, as in this embodiment, 3
The effect is further enhanced by providing the one detecting means 15, 16, 17.

[0023]

According to the present invention, since the nozzle bending is automatically and constantly managed, the safety is excellent, the withstand voltage failure is prevented, and the implosion failure is reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

 2 Braun tube 2a Neck part 2b Cavity 6 Air blow nozzle 15 Nozzle bending detection means 16 Nozzle position deviation detection means 17 Neck contact detection means 18 Limit gauge 20 Power supply 21 Detector 24 Optical sensor 25 Calculation circuit 26 Judgment circuit.

Claims (4)

[Claims] 1. A cathode ray tube manufacturing apparatus for inserting an air blow nozzle into a cathode ray tube tube to remove foreign matter from the tube, and a power supply for supplying an electric current to a cavity of the cathode ray tube.
An apparatus for manufacturing a cathode ray tube, comprising neck contact detection means including a detector for detecting whether or not a current flows through an air blow nozzle. 2. A Braun tube manufacturing apparatus for inserting an air blow nozzle into a Braun tube to remove foreign matter from the tube, wherein the clearance is provided on the outer circumference of the air blow nozzle and is within a permissible range of nozzle bending with respect to the outer circumference of the air blow nozzle. An apparatus for manufacturing a cathode ray tube, comprising: a limit gauge having: a power source for supplying a current to the limit gauge; and a nozzle bend detecting means including a detector for detecting whether or not a current flows through an air blow nozzle. 3. A method of manufacturing a cathode ray tube, wherein an air blow nozzle is inserted into a tube of a cathode ray tube to remove foreign matters in the tube, and after the air blow nozzle is inserted into the tube, an electric current is caused to flow in a cavity of the cathode ray tube, and this current is applied to the air blow nozzle. A method for manufacturing a cathode ray tube, characterized in that it detects whether or not it flows into the cathode ray tube. 4. A foreign matter removing method for removing foreign matter in a tube by inserting an air blow nozzle into the tube of a cathode ray tube,
A limit gauge having a clearance within the permissible range of nozzle bending with respect to the outer circumference of the air blow nozzle is arranged on the outer circumference of the air blow nozzle, and a current is passed through the limit gauge to detect whether or not this current flows through the air blow nozzle. And a method for manufacturing a cathode ray tube.