GB2228577A - Testing cathode ray tubes - Google Patents
Testing cathode ray tubes Download PDFInfo
- Publication number
- GB2228577A GB2228577A GB9001314A GB9001314A GB2228577A GB 2228577 A GB2228577 A GB 2228577A GB 9001314 A GB9001314 A GB 9001314A GB 9001314 A GB9001314 A GB 9001314A GB 2228577 A GB2228577 A GB 2228577A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- voltage
- grid
- cathode ray
- supplying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/42—Measurement or testing during manufacture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/24—Testing of discharge tubes
- G01R31/25—Testing of vacuum tubes
- G01R31/257—Testing of beam-tubes, e.g. cathode-ray tubes, image pick-up tubes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Cathode ray tube test apparatus comprises first means (60) for supplying a voltage to a first grid (2); means (SWb) for automatically connecting said first grid (2) and a cathode (1); second means (70) for supplying voltage to second and third grids (3, 4); means (R1) for detecting the current flowing through said cathode; an analogue/digital converter (20); and a processing unit (40) for comparing digital signals from the converter (20) reference data, and for transmitting the result (50). In use, and with first means (60) connected (a), the second means (70) is adjusted to bring the cathode current to a predetermined value. The first grid (2) is then connected (b) to the cathode (1) and the current is remeasured (20-50). <IMAGE>
Description
TRIODE CURRENT MEASURING DEVICE FOR CATHODE RAY TUBE
The present invention relates to an automatic device for measuring the triode current of cathode ray tube, and particularly to a triode current measuring device, which is capable of checking the characteristics of a cathode ray tube by automatically measuring the cathode current of a cathode ray tube.
Generally, a cathode current measuring process is carried out at the final stage of the manufacturing process of a cathode ray tube in order to check the good or no good state of the cathode ray tube by measuring the characteristics of the cathode ray tube. In the conventional cathode current measuring method, the worker carries out the measurement manually during the process of the manufacturing through the use of the device shown in
Figure 1, and this method will be described in detail below.
Upon arrival of a plurality of manufactured cathode ray tubes 1 to a certain position suspended on a trolley hanger, the worker applies the output voltage (for example, -45 volts) of a first voltage supplying section 6 to a first grid 2 of the cathode ray tube 1, the current value indicated by a current meter IK is set to a predetermined value through fine adjustments of the voltages Vcc supplied to second and third grids 3,4 and then, the voltages Vcc supplied to the second and third grids 3,4 are fixed.In a state with the voltage Vcc thus fixed, the worker turns over a switch S so that the first grid 2 and the current meter should be electrically connected each other, Under this condition, the current meter IK shows a certain value, and the worker reads the value as the cathode current value, thereby making a proper judgment about the characteristics of the cathode ray tube, and particularly about the characteristics of the triode.
According to such a manual measuring method, the attention has to be intensively concentrated during the reading of the current value through the current meter, and therefore, the worker not only easily exhausted, but also an error of the visual sense is generated because the reading is carried out through the visual sense. Further, the method has a primitive nature, and therefore, it is not suitable for mass productions, a great amount of human labor having to be inputted in order to carry out the measuring method.
Therefore it is the object of the present invention to provide a triode current measuring device for cathode ray tube, in which the measuring method is automatically systematized so as for the cathode current to be automatically measured.
In achieving the above object, the triode current measuring device according to the present invention comprises: a first voltage supplying means for supplying a voltage of a certain value to a first grid for a predetermined period of time; an automatic switch-over means for automatically connecting the first grid to the cathode upon elapsing of the set period of time; a second voltage supplying means for supplying an automatically adjusted voltage to second and third grids in such a manner that the value of the current flowing through the cathode should be properly set for different sizes of the cathode ray tubes upon supplying a voltage of a certain value through the first voltage supplying means to the first grid; a detecting means for detecting the current flowing through the cathode in a state with the first grid and the cathode connected each other through the automatic switch-over means; an analogue/digital (A/D) converting means for converting the analogue signals supplied from the detecting means to digital signals; and a central processing unit for comparing the digitalized signals with the pre-inputted reference data, and for transmitting the result of judgements to the peripheral devices or terminals.
The above object and other advantages of the present invention will become more apparent by describing in detail the preferred embodiment of the present invention with reference to the attached drawing in which;
Figure 1 is a circuital illustration of the conventional triode current measuring device for cathode ray tube; and
Figure 2 is a circuital illustration of the automatic triode current measuring device for cathode ray tube according to the present invention.
As shown in Figure 2, the triode current measuring device for cathode ray tube according to the present invention comprises: a first voltage supplying section 60 for supplying a predetermined voltage to a first grid 2 of a cathode ray tube 10 for a predetermined period of time; an automatic shift switch SW for automatically selecting and electrically connecting the first grid 2 to a cathode 1 and the first voltage supplying section 60 upon elapsing of a predetermined period of time; a second voltage supplying section 70 for carrying out automatic adjustments in such a manner that, in the initial measuring stage in which the first grid 2 and the first voltage supplying section 60 are connected through the automatic shift switch SW, automatically adjusted currents are supplied to the cathode 1 so as for the current induced in the cathode to have the preset value; and A/D converter 20 for detecting the value of the current flowing through the cathode upon electrical connection between the first grid 2 and the cathode 1 through the automatic shift switch, and for converting the current into digital signals; and a host computer 40 for receiving the output data of the A/D converter 20 through an interface 30, for comparing the received signals and the prestored reference data, and for transmitting the data having the required characteristics to peripheral devices and terminals 50.
The triode current measuring device for cathode ray tube according to the present invention constituted as above will now be described as to its operations.
Upon arrival of a manufactured cathode ray tube 10 at the measuring region, the contact of the automatic shift switch SW is connected to a point a for a predetermined period of time, so that a voltage (generally -45V) from the first voltage supplying section 60 is supplied to the first grid 2. Under such a condition, a voltage which has been automatically adjusted by the second voltage supplying section 70 is supplied to second and third grids 3,4, so that the current flowing through the cathode should be kept at the preset value (usually 0.5 mA).
If the voltage outputted from the second voltage supplying section 70 is automatically adjusted and set as described above, then the contact of the automatic shift switch SW is switched over from the point a to a point b, and under this condition, the current flowing through the cathode 1 flows to the ground via the resistance R1.
Accordingly, the A/D converter 20 connected to the resistance R1 converts the analogue signals of the voltage across the resistance R1 to digital signals, and transmits the digitalized signals through the interface 30 to the host computer 40. In turn, the host computer 40 compares the received signals with the predetermined reference data, and transmits the result of the comparison, i.e., the good or no good state to the peripheral devices or terminals 50, so that the worker should be aware of it.
According to the device of the present invention constituted as above and operated in the manner described above, the currents supplied to the second and third grids become automatically variable depending on the kind of the cathode ray tube, and therefore, the device of the present invention is capable of checking the characteristics of various types of cathode ray tubes, as well as being capable of checking large quantities of cathode ray tubes, thereby improving the productivity.
Claims (2)
1. A triode current measuring device for cathode ray tube comprising:
a first voltage supplying means for supplying a voltage of a certain value to a first grid for a predetermined period of time;
an automatic switch-over means for automatically electrically connecting said first grid and a cathode upon elapsing of a predetermined period of time;
a second voltage supplying means for supplying an automatically adjusted voltage to second and third grids in such a manner that the value of the current flowing through said cathode should be properly set for different siXzes of cathode ray tubes, upon supplying of a certain value of voltage through said first voltage supplying means to said first grid; ;
a detecting means for detecting the current flowing through said cathode in a state with said first grid and said cathode connected each other through said automatic switch-over means;
an analogue/digital (A/D) converting means for converting the analogue signals supplied from said detecting means to digital signals;
and a central processing unit for comparing the digital signals with pre-inputted reference data, and for transmitting the result of judgements to peripheral devices or terminals.
2. A triode current measuring device for cathode ray tube, substantially as hereinbefore described with reference to Figure 2 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019890002508A KR910004755B1 (en) | 1989-02-28 | 1989-02-28 | Automatic current measuring device for three electrode tube of color picture tube |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9001314D0 GB9001314D0 (en) | 1990-03-21 |
| GB2228577A true GB2228577A (en) | 1990-08-29 |
| GB2228577B GB2228577B (en) | 1993-03-31 |
Family
ID=19284192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9001314A Expired - Fee Related GB2228577B (en) | 1989-02-28 | 1990-01-19 | Current measuring device for cathode ray tube |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR910004755B1 (en) |
| CN (1) | CN1019417B (en) |
| GB (1) | GB2228577B (en) |
| MY (1) | MY104670A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6489919B1 (en) * | 2001-05-31 | 2002-12-03 | The United States Of America As Represented By The Secretary Of The Navy | Detector of faulty radar transmit tubes |
| US6667711B1 (en) * | 2001-05-31 | 2003-12-23 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for discerning degradation of electromagnetic radiating tubes |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137314A (en) * | 2015-08-29 | 2015-12-09 | 东莞市金华电子有限公司 | Gas discharge tube testing method and system employing mode of CPU numerical control |
-
1989
- 1989-02-28 KR KR1019890002508A patent/KR910004755B1/en not_active IP Right Cessation
- 1989-11-10 MY MYPI89001567A patent/MY104670A/en unknown
-
1990
- 1990-01-19 GB GB9001314A patent/GB2228577B/en not_active Expired - Fee Related
- 1990-01-25 CN CN90100748A patent/CN1019417B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6489919B1 (en) * | 2001-05-31 | 2002-12-03 | The United States Of America As Represented By The Secretary Of The Navy | Detector of faulty radar transmit tubes |
| US6667711B1 (en) * | 2001-05-31 | 2003-12-23 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for discerning degradation of electromagnetic radiating tubes |
| US6697014B1 (en) * | 2001-05-31 | 2004-02-24 | The United States Of America As Represented By The Secretary Of The Navy | Synergistic method for assessing an electromagnetic radiating tube system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR900013560A (en) | 1990-09-06 |
| CN1045299A (en) | 1990-09-12 |
| GB9001314D0 (en) | 1990-03-21 |
| CN1019417B (en) | 1992-12-09 |
| KR910004755B1 (en) | 1991-07-10 |
| GB2228577B (en) | 1993-03-31 |
| MY104670A (en) | 1994-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080119 |