JPH03185373A - Apparatus for inspecting withstand voltage of peripheral part of external anode terminal of cathode ray tube - Google Patents

Abstract

PURPOSE:To perform inspection on the automatic transport passage of a mass production process by mechanically and automatically pressing a discharge detecting pad wherein an anode pin and a pad are integrated to the anode terminal of the outer surface of a cathode ray tube funnel to apply high voltage thereto. CONSTITUTION:The cathode ray tube 4 mounted on a pallet 3 is fed by the feed roller chain 2 of a feed line and stopped at the position of an inspection apparatus. When an inspection start signal is sent, an anode pin 6 is inserted in an anode button 5 by an air cylinder 8 and a discharge detecting pad 7 is set to a detection range. At this time, residual charge is discharged to the anode button 5 for 3 sec. through a bleeder resistor and, thereafter, high voltage is applied thereto for 5 sec. and a leakage current and a spark are measured during this time. After the completion of measurement, the anode pin 6 is returned to the origin by the air cylinder 8 and an inspection completion signal is sent to move the pallet 3 having the cathode ray tube 4 mounted thereon.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is an object of mechanically and mechanically measuring the withstand voltage characteristics of the area around the anode terminal on the outer surface of the funnel of a cathode ray tube on an automatic transportation route in the mass production process of P3 electrode i-tubes. The present invention relates to a withstand voltage testing device for the peripheral area of a cathode ray tube external anode terminal that can be automatically tested.

[Prior Art] Conventionally, while applying a positive high voltage to the anode terminal on the outer surface of the funnel of a P3 electrode ray tube, a ring made of a conductor having a predetermined diameter is connected to the outer surface of the funnel centered on the anode terminal. Apply around the circular part of.

Sparks were detected visually. Also.

If the periphery of the anode terminal was dirty enough to be seen by visual inspection, a considerably large leakage current would continue to flow, so of course those that were soiled in this way were also considered defective. However, this is time-consuming and unreliable. In addition, an electric shock on the handling workbench (11 [accidents also occurred]9) In addition, as an inspection device for the area around the anode terminal, for example, Japanese Patent Application Laid-Open No. 62-67472? [JU is shown in α etc.

[Problems to be Solved by the Invention] The present invention solves the problems of the above-mentioned conventional methods and
On the automatic transportation route of the '7 Dansan F-Star, it is possible to mechanically and automatically inspect the pressure resistance characteristics of the area around the anode terminal on the outer surface of the funnel of the I12 pole tube, and also prevent the occurrence of electric shock accidents. The cathode 11A1i? The purpose of the present invention is to provide a withstand voltage testing device around an external anode terminal.

[Means to solve the problem] In order to quickly achieve the above 1] objective, the present invention aims to achieve the above objectives.

In the cathode ray tube mass production process, for example, cathode ray tubes mounted on a pallet or the like and flowing along an automatic transportation path are stopped at a withstand voltage characteristic test position around the external anode terminal, and the inspection device according to the present invention moves the cathode ray tubes onto the automatic transportation path. When the test start signal is received from the control device, attach the positive high voltage application pin and the four electric currents to be crimped to a circular part a predetermined distance apart from this pin to the anode terminal on the outside of the funnel of the cathode ray tube. The detection unit, which is an integrated combination of discharge detection pads made of rubber, is directed toward the anode terminal using, for example, an air cylinder and a position sensor.
After mechanically and automatically pressing the pin and the anode terminal into contact, a high voltage of a predetermined value is applied between the pin and the pad to prevent normal sparks or leakage current between the two. If the current value exceeds a predetermined failure judgment value and is determined to be defective by a digital panel meter with a resolution of 100nA of the current detection circuit connected to the pad,
The relay of this current detection circuit also detects the sharp rise or fall of the current at the time of the spark in the detection coil wound around the conductor leading to the high voltage application pin for extremely instantaneous sparks. We decided to configure the device to use a relay in a voltage detection circuit that uses the electromotive force generated to cause a current to flow through the thyristor, which is made conductive through the gate, to indicate the occurrence of a failure with sound and light.

[Function] With the above method, normal sparks and leakage currents whose current changes are relatively slow can be detected by the current detection circuit with a
It is detected as a defect only when the current value exceeds a predetermined defect judgment value by the 00nA digital panel meter, and the occurrence of extremely instantaneous sparks that are difficult to detect with the above-mentioned current detection circuit is caused by the above-mentioned voltage. Detected by a generating circuit. The resolution at this time is possible up to 10Vp-p.

[Implementation] In recent years, in order to reduce the number of personnel assigned to the international manufacturing process and to obtain high-quality products with thorough quality control.

Various tests are now being performed automatically. The device of the present invention can be used for 1 m on the white motor W1 road in the mass production process of -I triode ray tubes.
This is a withstand voltage testing device for the peripheral part of the external anode terminal of a cathode ray tube, which is capable of testing the withstand voltage characteristics of the peripheral part of the FIJt electrode terminal on the outer surface of the gamma channel (in an iE manner and automatically, of an I2 electrode ray tube).

FIG. 1 shows an external view of one embodiment of the present invention. In the figure, 1 is a conveyance frame, 2 is a conveyance roller chain, 3 is a pallet 1~,
4 is a cathode ray tube to be inspected, 5 is an anode terminal (commonly called an anode button because of its shape), 6 is an anode pin for applying high voltage to the anode button, and 7 is a conductive rubber ring centered around the anode pin. A discharge detection pad having a circumference of a predetermined radius, and 8 an air cylinder for moving a detection unit which is an integrated combination of an anode pin and a discharge detection pad.

Reference numeral 9 denotes a pedestal of the present inspection device, 10 a detection circuit section of the present inspection device, and 11 a high voltage section of the present inspection device.

A cathode ray tube 4 mounted on a pallet 3 is conveyed by a conveyance roller chain 2 of a conveyance line, and is stopped at a position of the cathode ray tube external anode terminal peripheral area withstand voltage testing device according to the present invention.

An inspection start signal is sent from the transport line to this inspection device.

In this inspection device, a seven-node pin 6 is inserted into an anode button 5 using an air cylinder 8, and a discharge detection pad 7 is set in a detection range. At this time, the anode button 5 of the cathode ray tube
If static electricity remains in the battery, it may cause erroneous determination, so first discharge the battery through the bleeder resistor for 3 seconds.

After this, high voltage is applied for 5 seconds, during which leakage current and sparks are measured. After the measurement is completed, the air cylinder 8 returns to the origin together with a detection section that applies a high voltage and tests the withstand voltage characteristics. This inspection device sends an inspection completion signal X to the conveyance line, whereby the pallet l-3 on which the cathode ray tubes 4 are mounted moves.

Figure 2(a) shows the voltage detection circuit of the vehicle inspection M device;
Figure (b) shows the current detection circuit.

In the voltage detection circuit shown in FIG. 2(,), the high voltage power supply 12,
When high voltage is applied to the anode button 5 via the anode pin 6, if sparks are generated due to dirt or the like, 8 electric power is generated in the detection coil 13 wound around the high voltage application wire. This electromotive force is generated by diode 14! ! The current is applied to the gate of thyristor 16, causing the thyristor to enter the 4-way state. At this time, a 1σ variable resistor 15 for sensitivity adjustment is used to set a specified voltage.

In this figure, 17 is a relay, 17a is a relay contact,
18 is a buzzer (although not shown, a failure alarm lamp is connected in series or parallel to the buzzer), 19 is +
The side power supply and 2o are the one side power supply.

In the current detection circuit shown in FIG. 2(b), when a high voltage is applied to the anode button 5, if a leakage current due to dirt or the like flows to the discharge detection pad 21 made of conductive rubber, this ? I! The flow is detected by a digital panel meter 25. In addition, as a countermeasure against circuit failure due to large current from high voltage, a protective resistor 24
And spark gap 22.23 is installed. In addition,
25a is a relay contact, 26 is a buzzer (although not shown, a failure alarm lamp is connected in series or parallel to the buzzer), 27 is a + side power supply, and 28 is one side power supply.

[Effects of the Invention] As explained above, according to the present invention, the withstand voltage characteristics of the area around the anode terminal on the outer surface of the funnel of the cathode ray tube can be mechanically and automatically adjusted to 1 on the automatic transportation route in the mass production process of cathode ray tubes. It is possible to perform highly accurate inspections that quantitatively perform pass/fail judgments based on judgment values, and it is also possible to reduce the number of inspectors 1't and ensure safety.

[Brief explanation of drawings]

FIG. 1 is an external view of an embodiment of the present invention, FIG. 2(a) is a diagram showing a voltage detection circuit of a vehicle inspection f device, and FIG. 2(b) is a diagram showing a current detection circuit. 1...m feeding rack white, 2...conveying roller chain,
3...Pallet, 4...Test logarithm [dipole tube,
5...Anode button, 6...Anode pin,
7...Pad for detecting air release, 8...Air cylinder, 9...Bracket of this inspection device, 10...Detection circuit section of this inspection device, 11...High pressure section of this inspection device , 12... High voltage power supply, 13... Detection coil, 14... Diode. 15... Variable resistor for sensitivity adjustment, 16... Thyristor, 17... Relay, 17a... Relay contact, 18... Buzzer, 19... + side power supply, 20... - side Power supply, 21...pad,
22.23...Spark gap, 24...Protection resistor, 25...Digital panel meter,
25a...Relay contact, 2G...Buzzer, 27...
・+ side power supply, 28...- side power supply. Figure 1 - Rare Haija

Claims (1)

[Claims] 1. Integrated detection by combining the anode terminal on the outside of the cathode ray tube funnel with a pin for applying a positive high voltage and a conductive discharge detection pad to be crimped to a circular part a predetermined distance apart from this pin. After the pin is mechanically and automatically pressed toward the anode terminal to bring the pin into contact with the anode terminal, a high voltage of a predetermined value is applied between the pin and the pad, and a normal spark between the two is generated. Or for leakage current, the resolution of the current detection circuit connected to the above pad is 100
When the current value exceeds a predetermined failure judgment value and is determined to be defective by the nA digital panel meter, the relay of this current detection circuit applies the above-mentioned high voltage to an extremely instantaneous spark. A voltage detection circuit that uses a current flowing through a thyristor made conductive via a gate by an electromotive force generated by a steep rise or fall of the current at the time of the spark in a detection coil wound around a conductor leading to a pin for the purpose of the voltage detection circuit. A withstand voltage testing device for the peripheral area of a cathode ray tube external anode terminal, characterized in that the occurrence of a defect is indicated by sound and light using a relay.