JPH09304470A - Apparatus for inspecting cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required for inspection by stopping the application of an anode voltage in a driving state under the control of a control circuit, inspecting gas ratio, setting a normal operating state, and outputting an image for the inspection. SOLUTION: A slat cathode-ray tube 5 is set to a jig and a switch 26 is turned on. A system control 52 supplies a normal driving power source from a power spruce circuit 51, thereby, the cathode-ray 5 is set in a normal image output mode. Then, the switch 26 is depressed and the circuit 51 supplies the driving power source necessary for inspecting a gas ratio. While the application of an anode voltage to the cathode-ray tube 5 is stopped, a current in the tube is measured by an ammeter device 3 and a degree of vacuum is measured. In response to the measurement result from the device 3, the control 52 sets the cathode-ray tube 5 again in an image output inspection mode. When the image output is detected to be correct, the cathode-ray tube 5 is switched to a stray inspection mode and consequently turned OFF. An electron gun is confirmed while a high anode voltage is impressed to the cathode-ray tube, when a sequence of inspections is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a cathode ray tube, for example, for an inspection process of a cathode ray tube (hereinafter referred to as a flat cathode ray tube) in which a fluorescent screen is tilted with respect to a tube axis to form a flat shape as a whole. Applying this, the anode voltage application is stopped while the cathode ray tube is driven, and the in-tube current is inspected, then the cathode ray tube is set to the normal operating state and a predetermined display screen is displayed, which is required for the inspection. Reduce work time.

[0002]

2. Description of the Related Art Conventionally, in a flat cathode ray tube inspection process, after exhausting a flat cathode ray tube for a predetermined time, the flat cathode ray tube is sequentially connected to an inspection device to execute predetermined inspection items. .

That is, FIG. 6 shows that in this inspection process,
It is a perspective view which shows the gas ratio (it consists of what is called GR) inspection apparatus initially performed. The inspection device 1 is composed of an inspection device main body 2 and an ammeter device 3. Here, the inspection device main body 2 is configured to be able to supply a test power source to the flat cathode ray tube 5 via the stem pin socket 4.
The test voltage can be confirmed by the meter 6 on the front side.

The ammeter device 3 is connected to the inspection device body 2 so that the in-tube current of the flat cathode ray tube 5 can be observed by the meter 7 on the front side, and when this current shows an abnormal value, the inspector is notified by the built-in comparator. It is designed to do. The inspection apparatus 1 stops the application of the anode voltage while driving the flat cathode ray tube 5 by applying a predetermined voltage to each electrode of the flat cathode ray tube 5. Thereby, the in-tube current of the flat cathode ray tube 5 is measured, and the vacuum degree of the flat cathode ray tube 5 is inspected from the in-tube current.

FIG. 7 is a perspective view showing an image output inspection apparatus applied to the subsequent image output inspection. This image inspection device 1
1, the stem pin sockets 12 are arranged in two rows, and the flat cathode ray tube 5 can be arranged in each stem pin socket 12. Further, in the image output inspection device 11, the drive circuit of the flat cathode ray tube 5 is connected to each stem pin socket 12, so that the operation can be confirmed by actually displaying an image on each flat cathode ray tube 5. .

[0006]

By the way, in the cathode ray tube of this kind, if the working time required for the inspection can be shortened, the time required for manufacturing the cathode ray tube can be shortened accordingly.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a cathode ray tube inspection apparatus capable of shortening the working time required for the inspection.

[0008]

In order to solve such a problem, in the present invention, the control circuit stops the application of the anode voltage while driving the cathode ray tube and inspects the in-tube current. A normal operation state is set and a predetermined display screen is displayed.

After the application of the anode voltage is stopped while the cathode ray tube is driven and the tube current is inspected, the cathode ray tube is set to a normal operating state and a predetermined display screen is displayed, so that the gas ratio can be inspected. Subsequently, the inspection of the image output can be performed, and the time required for attaching and detaching the cathode ray tube can be shortened accordingly.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a perspective view showing a flat cathode ray tube inspection apparatus according to an embodiment of the present invention. This inspection device 2
No. 0 sets the flat cathode ray tube 5 on the jig 21 and then operates a predetermined operator to perform a series of electrical inspections necessary for the flat cathode ray tube 5. That is, the inspection device 20 mainly includes the inspection device main body 2 that controls the entire operation.
2. It is composed of a gas ratio inspection device body 2 and an ammeter device 3.

Of these, the jig 21 is, as shown in FIG.
A plate member 25 made of the same insulating material is held substantially vertically on a base 24 made of an insulating material to form a frame, and a step switch 26 and a stop switch 27 are arranged on the side of the frame. Here, the step switch 26 is a switch for switching the inspection mode, and the stop switch 27 is a switch for stopping the inspection. As a result, the jig 21 can set the flat cathode ray tube 5 and then press the step switch 26 to sequentially inspect predetermined inspection items. In an emergency, the stop switch 27 is pressed. Then, the inspection can be stopped immediately.

The plate member 25 holds a holder 29 on the lower side, and this holder 29 holds a contact spring which comes into contact with the stem outer pin of the flat cathode ray tube 5.
These contact springs are used for the third grid G3, and the reed relays 30 of ultrahigh withstand voltage that are arranged in the immediate vicinity are provided.
And 31 are connected to the inspection device main body 22, and the others are directly connected to the inspection device main body 22. As a result, the jig 21 is configured to supply the flat cathode ray tube 5 with driving power for the first to third grids G1 to G3 and the heater via the holder 29. For this reason, in this embodiment, the reed relay 30 is used.
By arranging 31 and 31 in the vicinity of the flat cathode ray tube 5, in a gas ratio inspection for measuring a weak tube current, noise mixing due to cable routing is reduced,
The measurement accuracy is improved accordingly.

The plate member 25 is placed on the upper side of the holder 29 by D
The Y holder 33 is arranged, and the deflection yoke 34 of the flat cathode ray tube 5 is held in advance on the DY holder 33. On the other hand, in the plate member 25, a high-voltage anode pin 36 is arranged on the side of the DY holder 33 by being urged by a spring, and the high-voltage anode pin 36 comes into contact with the anode of the flat cathode ray tube 5. There is. Accordingly, the jig 21 can set the flat cathode ray tube 5 in the inspection device 20 by a simple operation of inserting the neck of the flat cathode ray tube 5 into the deflection yoke 34 and pressing it against the holder 29.

The holder 29, the DY holder 33,
The deflection yoke 34 and the high-voltage anode pin 36 are rotatably held so that the pin 38 of the shaft pin retainer 37 arranged below the plate member 25 serves as a rotating shaft so that the deflection yoke 34 and the high-voltage anode pin 36 are separated from the plate member 25 as a whole. The work of setting the flat cathode ray tube 5 can be further simplified.

Further, the plate member 25 is provided with guide plates 40 and 41 which guide the lateral sides of the flat cathode ray tube 5 so that the flat cathode ray tube 5 can be set easily and surely. Further, the plate material 25 is indicated by an arrow A.
As shown by, the upper holder 43 is movably held in the vertical direction, and the upper holder 43 is biased downward by a spring to press and hold the flat cathode ray tube 5 toward the holder 29. There is.

Further, the plate member 25 is provided with a pair of screws 44 and 45 projecting toward the flat cathode ray tube 5 on the upper side,
By varying the protrusion amount of the screws 44 and 45, the arrangement position of the flat cathode ray tube 5 can be adjusted in the vertical direction. Further, the plate member 25 is provided with a limit switch 47 at a substantially central portion covered by the flat cathode ray tube 5, and the limit switch 47 can detect whether or not the flat cathode ray tube 5 is placed. Therefore, in the inspection apparatus 20, when it is determined by the limit switch 47 that the flat cathode ray tube 5 is not arranged, the supply of the driving power to the holder 29 and the like is controlled to be stopped, whereby an electric shock accident or the like occurs. It is designed so that the occurrence can be effectively avoided.

FIG. 4 is a block diagram showing the overall construction of the inspection apparatus 20. The inspection device 20 includes a deflection circuit 34 housed in the inspection device body 22 and a deflection yoke 34.
Drive. Further, the inspection device 20 includes an inspection device main body 22.
And the power supply circuit 5 housed in the gas ratio inspection device body 2
Driving power is supplied from 1 to the flat cathode ray tube 5. At this time, the inspection device 20 controls the switches 26, 27, 4 by the system control circuit 52 including the sequence control circuit.
7 in response to the operation of these switches 26, 27, 47, the contacts of the relays 30, 31, 54 to 63 arranged between the power supply circuit 51 and the flat cathode ray tube 5, the deflection circuit 50 and the flat circuit. The contacts of the relay 65 arranged between the cathode ray tubes 5 are switched, so that the flat cathode ray tube 5 and the deflection yoke 34 are supplied with the power source and the like required for a predetermined inspection item.

Therefore, the deflection circuit 50 drives the deflection yoke 34 in synchronization with the video signal SV supplied from the power supply circuit 51 to the flat cathode ray tube 5. The power supply circuit 51 supplies a high voltage of 10 [kV] for stray inspection to the anode of the flat cathode ray tube 5 through the reed relay 30 having an ultrahigh withstand voltage arranged on the jig 21, and similarly. Then, a high voltage of 6 to 8 [kV], which is a standard operating voltage of the flat cathode ray tube 5, is supplied via a reed relay 31 having an ultrahigh breakdown voltage. Here, the stray inspection is an inspection for detecting abnormal discharge of the electron gun due to foreign matter or the like.

Further, the power supply circuit 51 includes a second grid G2.
On the other hand, while the power of 450 [V] required for the image inspection and the stray inspection is supplied via the relay 54,
200 required for gas ratio inspection via relay 54
The power of [V] is supplied. The power supply circuit 51 supplies the heaters H1 and H2 with the DC current I1 of 278 [mA] required for the gas ratio inspection from the built-in DC constant current circuit via the relays 56 and 58, whereas Similarly, a DC current I of 300 [mA] required for image inspection from the built-in DC constant current circuit via 57 and 59.
Supply 2. Therefore, in this embodiment, the heaters H1 and H2 are driven by the DC constant current circuit,
It is arranged to effectively avoid the deterioration of the measurement accuracy due to the contact resistance between the stem outer pin of the flat cathode ray tube 5 and the contact spring.

Further, the power supply circuit 51 includes the first grid G1.
On the other hand, while the video signal SV required for the image output inspection is supplied via the relay 60, the power of 0 to −140 [V] required for the gas ratio inspection is supplied via the relay 61. Further, the power supply circuit 51 supplies the power of 600 to 900 [V] required for the image inspection and the stray inspection to the third grid G3 via the relay 62, while the relay 63 and the ammeter. The -25 [V] power supply required for the gas ratio test is supplied through the device 3. The relay 5 connected to these first to third grids G1 to G3
Nos. 4, 55, and 60 to 63 are reed relays having an ultrahigh withstand voltage.

On the other hand, the system control circuit 52, when the power is turned on as shown in FIG.
To step SP2, where step switch 2
It is determined whether or not 6 is pressed, and if a negative result is obtained, step SP2 is repeated. On the other hand, when the step switch 26 is pressed, a positive result is obtained, so that the system control circuit 52 causes the step SP
Then, it is determined whether the limit switch 47 is held in the ON state. When a negative result is obtained here, the system control circuit 52 returns to step SP2, whereby the flat cathode ray tube 5 is not set,
When the inspector mistakenly presses the step switch 26, the operator waits for a correct operation without supplying power to the flat cathode ray tube 5.

On the other hand, when the step switch 26 is pressed while the flat cathode ray tube 5 is set,
When a positive result is obtained in step SP3, the system control circuit 52 proceeds to step SP4,
Here, the entire operation mode is switched to the image output mode.
Here, this image output mode is an operation mode in which the flat cathode ray tube 5 is driven in a normal operation state to perform various tests. The system control circuit 52 outputs the control signal SN in the image output mode and outputs the corresponding relay 31, 54, 57, 5 or 5.
By turning on 9, 60, 62 and 65, as shown in FIG. 5, necessary power is supplied to each electrode and the like to display the video signal SV on the flat cathode ray tube 5.

Subsequently, the system control circuit 52 moves to step SP5 and waits for a determination as to whether or not the transparent electrodes are correctly arranged. Here, this determination is executed by the visual confirmation of the inspector, and when it is determined that the inspector is not properly arranged, a negative result is obtained in step SP5 by pressing the stop switch 27. In this case, the system control circuit 52 immediately stops the output of the control signal SN, and then, in step SP6, after the flat cathode ray tube 5 is judged to be defective by the inspector in step SP6, the system control circuit 52 proceeds to step SP7 to perform this processing procedure. To finish.

On the other hand, when the inspector judges that the transparent electrodes are correctly arranged and presses the step switch 26, the system control circuit 52 moves from step SP5 to step SP8, where the entire operation mode is set. To the gas ratio (GR) mode. Here, the gas ratio mode is an operation mode for checking the gas ratio,
The system control circuit 52 outputs the gas ratio mode control signal SG instead of the control signal SN and outputs the corresponding relay 5
4, 56, 58, 61, 63 are turned on.
Further, the system control circuit 52 waits for a predetermined time in this state, and then proceeds to step SP9.

Here, the system control circuit 52 judges from the comparator output of the ammeter device 3 whether or not the in-tube current is normal, and if a negative result is obtained here, the routine moves to step SP6. On the other hand, when a positive result is obtained, the system control circuit 52 proceeds to step SP10 and switches the entire operation mode to the image output mode again.

Subsequently, the system control circuit 52 moves to step SP11 and waits for a determination as to whether or not the image output inspection is normal. Here, this judgment is executed by visual inspection by the inspector, and when the inspector judges that any of the inspection items is abnormal, the stop switch 2
A negative result is obtained in step SP11 by the pressing operation of 7. Here, these inspection items are the level of resolution at which the display of the test pattern is visually inspected, the presence or absence of tailing on the display screen (so-called halation), and the presence or absence of light emission outside the effective screen due to phosphor attachment. Become.

As a result, the system control circuit 52, when the stop switch 27 is pressed by the inspector,
Move to step SP6. On the other hand, when the step switch 26 is pressed by the inspector, a positive result is obtained, and the process proceeds to step SP12.

Here, the system control circuit 52 outputs the stray inspection mode control signal SS instead of the control signal SG, switches the corresponding relays 30, 54 and 62 to the ON state, and stray inspects the entire operation mode. Switch to mode. Subsequently, the system control circuit 52 proceeds to step SP.
The process moves to 13 and waits for a determination as to whether the stray inspection is normal. Here, this determination is executed by visual inspection by the inspector, as in the case of image measurement, and when the inspector determines that there is an abnormality, the stop switch 27 is pressed to give a negative result in step SP13. Will be obtained.

As a result, the system control circuit 52 proceeds to step SP6 when a negative result is obtained in step SP13. On the other hand, if a positive result is obtained, the system control circuit 52 stops the output of the control signal SS, and then, in step SP14, after the flat cathode ray tube 5 is judged to be a good product by the inspector, the system control circuit 52 proceeds to step SP.
Then, the procedure goes to 7 to end this processing procedure.

Thus, in this embodiment, the relays 30, 31, 54 to 65 form a voltage switching circuit for switching the voltage of the driving power source.

In the above-described structure, the flat cathode ray tube 5 (FIGS. 2 and 3) to be inspected has the neck with the deflection yoke 3
4, the anode and the stem outer pin are pressed against the high-voltage anode pin 36 and the holder 29, respectively, and then the whole is rotated to the plate material 25 side and the upper part is hooked on the upper holder 43, thereby the jig of the inspection device 20. 21 is set. In this state, the flat cathode ray tube 5 presses the limit switch 47, whereby the inspection device 20
At, it is confirmed that the flat cathode ray tube 5 is correctly set.

In this state, the inspector operates the step switch 26.
When the button is pressed (FIG. 1), the corresponding relay 31, 54, 57, 59, 60, 62, 65 is switched to the ON state by the control circuit 52, and the normal drive power is supplied from the power supply circuit 51 (FIG. 4). ). As a result, the flat cathode ray tube 5
The image output mode is set in the normal operation state, and the display screen of the video signal SV is displayed.

In the supply of the driving power, the heaters H1 and H2 of the flat cathode ray tube 5 are driven by the DC constant current power supply, and thereby the deterioration of the measurement accuracy due to the contact resistance of the stem outer pin is effectively avoided.

When the inspector judges that the transparent electrode is correctly arranged in this state, the inspector determines that the step switch 2
6 is pressed (FIG. 1), whereby the control circuit 52 switches the corresponding relays 54, 56, 58, 61, 63 to the ON state, and the power supply circuit 51 supplies the drive power required for the gas ratio inspection ( (Fig. 4). Thus, in the flat cathode ray tube 5, the current (that is, the in-tube current) of the third grid G3 is measured by the ammeter device 3 while the application of the anode voltage is controlled to be stopped, and the degree of vacuum is measured.

In the measurement of the degree of vacuum, the flat cathode ray tube 5 is caused by a cable to be routed by applying a predetermined voltage to the third grid G3 by the reed relays 30 and 31 having the ultrahigh withstand voltage arranged in the immediate vicinity. The mixing of noise and the like is reduced, and the current in the tube is measured correctly accordingly.

When the degree of vacuum is normal, a judgment result is obtained from the comparator built in the ammeter device 3, whereby the flat cathode ray tube 5 is set to the image inspection mode again by the control circuit 52, and the power supply circuit is set. Driving power in a normal operating state is supplied from 51 (FIG. 4). As a result, the flat cathode ray tube 5 displays the display screen of the video signal SV.

In this state, when it is judged by the inspector that the image inspection is correct, the control circuit 52 of the flat cathode ray tube 5 switches the corresponding relays 30, 54 and 62 to the ON state, and the whole flat cathode ray tube 5 is turned on. The operation mode is switched to the stray inspection mode. In this stray inspection mode, the flat cathode ray tube 5 is set to the cut-off state, and an anode voltage higher than that in the normal operation state is applied, whereby a series of inspections is performed after it is confirmed that the electron gun is abnormal. Complete.

According to the above configuration, the driving power source of the flat cathode ray tube 5 is switched, and the application of the anode voltage is stopped while the flat cathode ray tube 5 is driven to inspect the in-tube current.
By setting the flat cathode ray tube 5 in a normal operation state and displaying a predetermined display screen, the image drawing inspection, the gas ratio inspection, and the stray inspection necessary for the operation test of the flat cathode ray tube 5 are collectively performed. You can Therefore, the number of times of attaching and detaching the flat cathode ray tube 5 can be reduced by that amount, the time required for the inspection can be shortened, and the work efficiency can be improved.

Since a series of inspections can be carried out for each flat cathode ray tube 5 by setting it on one jig 21, it is possible to easily cope with a change in inspection process, a change in production model and the like. Further, reed relays 30 and 31 for switching the voltage of the third grid G3 are arranged in the immediate vicinity of the flat cathode ray tube 5, and further the heaters H1 and H2 are provided by a DC constant current power supply.
By driving, it is possible to effectively prevent noise from entering and deterioration of measurement accuracy due to contact resistance, and it is possible to measure the in-tube current and the like reliably.

In the above embodiment, the case where the tube current is measured by the current of the third grid G3 has been described, but the present invention is not limited to this, and the case where the tube current is measured by another electrode current. Can also be widely applied.

Further, in the above-mentioned embodiment, the case where the flat cathode ray tubes are inspected one by one has been described, but the present invention is not limited to this, and is widely applied to the case of inspecting a plurality of tubes simultaneously in parallel. be able to.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the operation inspection of the flat cathode ray tube has been described, but the present invention is not limited to this, and is widely applied to various inspection apparatuses of the cathode ray tube. You can

[0044]

As described above, according to the present invention, the application of the anode voltage is stopped while the cathode ray tube is being driven to measure the in-tube current, and then the cathode ray tube is set to a normal operating state to set a predetermined value. By displaying the display screen, the image ratio inspection can be performed subsequent to the gas ratio inspection, and the time required for the inspection can be shortened as compared with the related art.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining the operation of an inspection device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the overall configuration of the inspection device of FIG.

3 is a perspective view showing details of a jig of the inspection apparatus of FIG.

FIG. 4 is a block diagram showing an overall configuration of the inspection device of FIG.

5 is a table showing a driving power supply in each operation mode of the inspection device of FIG.

FIG. 6 is a perspective view showing a conventional gas ratio inspection device.

FIG. 7 is a perspective view showing a conventional image inspection inspection device.

[Explanation of symbols]

1, 11, 20 ... Inspection device, 2, 22 ... Inspection device main body, 3 ... Ammeter device, 5 ... Flat cathode ray tube, 21 ...
Jig, 26, 27, 47 ... switch, 30, 31, 5
4-63, 65 ... Relay, 50 ... Deflection circuit, 52 ...
… System control circuit

Claims (1)

[Claims] 1. A power supply circuit for outputting a driving power supply for a cathode ray tube, a voltage switching circuit for switching a voltage of the driving power supply, a current measuring circuit for measuring an in-tube current of the cathode ray tube, and an operation of the voltage switching circuit. And a control circuit for controlling, wherein the control circuit stops the application of the anode voltage in a state of driving the cathode ray tube and inspects the in-tube current, and then sets the cathode ray tube to a normal operating state to set a predetermined value. Cathode ray tube inspection device characterized by displaying a display screen