CN1192037A - Heater voltage supply circuit for cathode ray tube - Google Patents
Heater voltage supply circuit for cathode ray tube Download PDFInfo
- Publication number
- CN1192037A CN1192037A CN97109390A CN97109390A CN1192037A CN 1192037 A CN1192037 A CN 1192037A CN 97109390 A CN97109390 A CN 97109390A CN 97109390 A CN97109390 A CN 97109390A CN 1192037 A CN1192037 A CN 1192037A
- Authority
- CN
- China
- Prior art keywords
- heater
- ray tube
- cathode ray
- supply circuit
- heater voltage
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/135—Circuit arrangements therefor, e.g. for temperature control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/22—Heaters
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
To provide a heater voltage supply circuit that applies a heater voltage to each heater connecting respectively to red(R), green(G) and blue(B) electron guns so as to allow the R, G and B electron guns to emit electrons quickly. The circuit is provided with R, G and B electron guns. In this case, a heater 40 is driven independently by using a transformer that has a primary winding receiving a heater voltage and secondary windings which applies a voltage induced from the primary winding to each heater connecting to the R, G and B electron guns. Thus, the drive time of a cathode ray tube is reduced, the impedance matching is facilitated and the efficiency is improved.
Description
The present invention relates to be used for heater voltage supply circuit cathode ray tube, that can start this cathode ray tube fast, in this circuit, electric current is supplied with and the corresponding heater of the electron gun of this cathode ray tube independently by transformer.
As everyone knows, general cathode ray tube makes to the fluorophor it luminously come display image by divergent bundle.The electronics of this electron beam is that the negative electrode from electron gun produces.The front end oxide materials coat of this negative electrode, and with heater to its heating to produce electronics.The electronics that is produced focuses on and quickens to grid as electron beam.
Fig. 1 represents to be used for the heater voltage supply circuit figure of conventional cathode ray tube (CRT).Common CRT10 comprises red (R) that is used to show three primary colors, green (G) and blue (B) electron gun 20.These electron guns can produce electron beam.Single heater 30 is corresponding with R, G and B electron gun 20.The heater voltage heating of this heater 30 by presenting by the kickback transformer (not shown), and this kickback transformer is to be used for providing driving voltage to each part of CRT.This R, G and B electron gun 20 are heated with divergent bundle by the heat emission of heater 30.
Yet, in the common heater voltage supply circuit, R, G and B electron gun 20 be with single heater 30 simultaneously to its heating, make electron gun 20 reach predetermined temperature thus, so that the emission of the electronics of advection (smooth) R, G and B electron gun 20.As a result, reaching the temperature of being scheduled to needs for a long time.That is to say that after electron gun 20 heating in the CRT of supply power, needing for a long time could divergent bundle.And because R, the G and the B electron gun 20 that work alone are heated simultaneously by single heater 30, this just may not reach impedance matching, so produce unsettled initial pictures.
For addressing the above problem, an object of the present invention is to provide a heater voltage supply circuit that is used for cathode ray tube, in this circuit, respectively there is a heater corresponding, with start-up time and therefore quick this cathode ray tube that starts that reduces electron gun with R, G and B electron gun.
Another object of the present invention provides the heater voltage supply circuit that is used for cathode ray tube, and in this circuit, each heater voltage is supplied with R, G and B electron gun independently by transformer, so that impedance matching and raising the efficiency.
For reaching above-mentioned purpose of the present invention, a kind of heater voltage supply circuit that is used to comprise the cathode ray tube of R, G and B electron gun is provided, this heater voltage supply circuit is characterized in that: each heater is corresponding with R, G and B electron gun, and a transformer links to each other with heater, thereby provides heater voltage to heater from external power source independently through this transformer.
Below with reference to accompanying drawing the present invention is described in more detail, in the accompanying drawing:
Fig. 1 represents to be used for the common heater voltage supply circuit figure of cathode ray tube; And
Fig. 2 represents to be used for according to the preferred embodiment of the invention the heater voltage supply circuit figure of cathode ray tube.
The preferred embodiments of the present invention are described with reference to the accompanying drawings.
Fig. 2 shows the heater voltage supply circuit that is used for cathode ray tube according to the preferred embodiment of the invention.Cathode ray tube 10 comprises R, G and B electron gun 20.Each heater 40 is corresponding with each electron gun R, G and B electron gun 20 respectively.Use the transformer 50 of powering to link to each other with heater 40 from the heater voltage of kickback transformer (not shown).This transformer 50 is exported the heater voltage from kickback transformer from its primary coil to its secondary coil.The output of secondary coil powers for independently each and R, G and B electron gun 20 corresponding heaters 40 in this transformer 50.
If add power supply for this cathode ray tube, then from the primary coil of the heater voltage sensor transformer 50 of kickback transformer.This induced voltage sensed each with secondary coil that heater 40 links to each other on.Respectively with the secondary coil of R, G and B electron gun 20 corresponding heaters 40 by transformer 50 the heater voltage emitting heat quantity of confession.R, G and B electron gun 20 are by each heater 40 independent heat heating that produces, emitting electrons then.And this heater voltage of responding to is independently supplied with heater 40, helps impedance matching.
Therefore, according to the present invention, each heater is corresponding with R, G and B electron gun in cathode ray tube, and heater voltage independently supplied with by transformer, thereby helps starting fast and impedance matching also can be raised the efficiency.
Though one embodiment of the present of invention have only been described here especially,, do not breaking away under the spirit and scope of the present invention situation, it is conspicuous can making multiple modification to the present invention.
Claims (2)
1. heater voltage supply circuit that is used to comprise the cathode ray tube of R, G and B electron gun, it is characterized in that: each heater is corresponding with R, G and B electron gun respectively.
2. heater voltage supply circuit as claimed in claim 1, also comprise a transformer, this transformer has a primary coil that receives heater voltage and one and is used for from the voltage of the primary coil induction secondary coil of supply and R, G and corresponding each heater of B electron gun independently.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR82572/96 | 1996-12-30 | ||
| KR1019960082572A KR19980063126A (en) | 1996-12-30 | 1996-12-30 | CRT heater voltage supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1192037A true CN1192037A (en) | 1998-09-02 |
Family
ID=19493988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109390A Pending CN1192037A (en) | 1996-12-30 | 1997-12-30 | Heater voltage supply circuit for cathode ray tube |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH10224716A (en) |
| KR (1) | KR19980063126A (en) |
| CN (1) | CN1192037A (en) |
-
1996
- 1996-12-30 KR KR1019960082572A patent/KR19980063126A/en not_active Application Discontinuation
-
1997
- 1997-12-24 JP JP9355706A patent/JPH10224716A/en active Pending
- 1997-12-30 CN CN97109390A patent/CN1192037A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR19980063126A (en) | 1998-10-07 |
| JPH10224716A (en) | 1998-08-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| REG | Reference to a national code |
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