CN2705888Y - Direct heating electronic gun and its cahtode ray tube - Google Patents
Direct heating electronic gun and its cahtode ray tube Download PDFInfo
- Publication number
- CN2705888Y CN2705888Y CN 200420045637 CN200420045637U CN2705888Y CN 2705888 Y CN2705888 Y CN 2705888Y CN 200420045637 CN200420045637 CN 200420045637 CN 200420045637 U CN200420045637 U CN 200420045637U CN 2705888 Y CN2705888 Y CN 2705888Y
- Authority
- CN
- China
- Prior art keywords
- heated filament
- electron gun
- base metal
- heated
- cathode
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
The utility model discloses a kind of directly-heated type electron gun and cathode ray tube thereof, the technical problem that solves is the start-up time of improving gun cathode, reduce the power consumption of heated filament, by the following technical solutions: a kind of directly-heated type electron gun, comprise cathode assembly, the negative electrode of described cathode assembly is the oxide coating that is coated on the Base Metal heated filament band, the two ends of Base Metal heated filament band are connected with the heated filament lead-in wire respectively, the heated filament lead-in wire is fixedly installed on the vitrifying support, a kind of cathode ray tube, use above-mentioned electron gun, compared with prior art, the two ends of Base Metal heated filament band connect the heated filament lead-in wire, the oxide coated cathode coating is coated on the Base Metal heated filament band, makes electronics be reduced to 1 to 2 second launch time, can make its voltage endurance improve more than 10%, energy-conservation about 90%, can be widely used in the driving cabin instrument and show, fields such as image tracing display.
Description
Technical field
The cathode-ray tube structure that the utility model relates to a kind of directly-heated type oxide coated cathode electron gun and uses this electron gun.
Background technology
Cathode ray tube is widely used in the various aspects of our live and work, and as industry demonstration and surveillance, the TV that our daily life is seen is its application example the most widely.For a long time, people are concerned about factors such as its brightness, contrast, resolution too much, and have ignored its power problems.In today of science and technology fast development, this problem has been one and has had to consider the ground problem.In quiet image display system, all cathode ray tubes all are to adopt the heated filament heating at present, and promptly indirect-heating is realized what electronics was launched.For the electron gun of indirect-heating structure, the warm start time of its electronics emission greatly about about 8 seconds, still, even Duan time so for terminal display spare, still seem fast inadequately with image indicating characteristic.In order to shorten the time that the cathode emission electron institute needs, the electron gun of external existing quick starter cathode, as United States Patent (USP) 5493172 disclosed structures, its neck is φ 13, cost is lower, power consumption is little, but the drawback of its voltage-resistent characteristic and electron-optical properties is also by inadequate.In recent years, domestic most of tube mills produce the picture tube of φ 20 structures, and its electron gun still is an indirected heated cathode structure, and the electronics emission rate of this structure is fast inadequately., adopted multiple technologies to compensate its defect in industry, though make filament wattage reduce to present 2 watts from original 3.6 watts, toggle speed remains its greatest drawback slowly; Generally on circuitry, taked to preset the mode of operating state at present, reached electronics with shortening and launch the needed time; Also have in order to shorten the start-up time of cathode emission, adopt the mode that improves the heated filament operating power,, make its toggle speed bring up to present 3 to 4 seconds by force even the heated filament operating voltage is higher than its rated operational voltage out and away.On the electron gun work principle, can make on the one hand and quicken the cathode electronics emission, cause the lost of life; Be unfavorable for energy-conservation on the other hand.
Summary of the invention
The purpose of this utility model provides a kind of directly-heated type electron gun and cathode ray tube thereof, and the technical problem that solve is the start-up time of improving gun cathode, reduces the power consumption of heated filament.
The utility model is by the following technical solutions: a kind of directly-heated type electron gun, comprise cathode assembly, the negative electrode of described cathode assembly is the oxide coating that is coated on the Base Metal heated filament band, the two ends of Base Metal heated filament band are connected with the heated filament lead-in wire respectively, and the heated filament lead-in wire is fixedly installed on the vitrifying support.
Base Metal heated filament belt shape of the present utility model is banded, and two ends are spill to same direction bending 90 degree.
The width of the utility model Base Metal heated filament band is 0.6 to 0.8 millimeter, and thickness is 0.02 millimeter, and the one side that the vitrifying support is relative with negative electrode also is provided with the sintered glass ceramics body, and two heated filaments lead-in wire is 6 millimeters apart, and its diameter is 1 millimeter of φ.
Oxide coating of the present utility model is the triplex carbonate oxide coating.
Triplex carbonate oxide coating thickness of the present utility model is 5 to 15 microns.
The prefocus lens assembly of the utility model cathode assembly comprises the first anode, second plate and first focusing electrode; The main lens system of cathode assembly comprises second focusing electrode and third anode.
The utility model Base Metal heated filament band is provided with ceramic gasket outside the two ends, its shape is the cross section and is oval cylindrical shell, minister's shaft position respectively is provided with the interval step of the negative electrode and the first anode in the top, and the major axis internal diameter of ceramic gasket is 4.5 millimeters, and heated filament goes between vertically near its major axis inner surface.
A kind of cathode ray tube comprises electron gun, and the negative electrode of the cathode assembly of described electron gun is the oxide coating that is coated on the Base Metal heated filament band, and the two ends of Base Metal heated filament band are connected with the heated filament lead-in wire respectively, and the heated filament lead-in wire is fixedly installed on the vitrifying support.
The caliber of the utility model cathode ray tube is 20 millimeters.
Cathode ray tube of the present utility model is a flat CRT.
The utility model compared with prior art, the two ends of Base Metal heated filament band connect the heated filament lead-in wire, the oxide coated cathode coating is coated on the Base Metal heated filament band, make electronics be reduced to 1 to 2 second launch time, adopt the cathode ray tube of directly-heated type electron gun and heavy caliber electron gun main lens structure, can make its voltage endurance improve more than 10%, energy-conservation about 90%, and reduced previously used prewired circuit, and saved display complete machine cost, realize the quick demonstration of data image.
Description of drawings
Fig. 1 is a prior art electron gun structure longitudinal profile schematic diagram.
Fig. 2 is the cathode assembly profile of the utility model embodiment.
Fig. 3 is cathode assembly and the ceramic gasket stereogram of the utility model embodiment.
Fig. 4 is the ceramic gasket stereogram of the utility model embodiment.
Fig. 5 is the indirected heated cathode structure schematic diagram.
Fig. 6 is the bipotential lens structural representation of the utility model embodiment.
Fig. 7 is the unipotential lens structural representation of the utility model embodiment.
Fig. 8 is the utility model embodiment cathode-ray tube structure schematic diagram.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail.As Fig. 1 and shown in Figure 5, the cathodes heated indirectly by an el electron gun that the prior art flat display tube is used, heated filament is arranged in the cathode sleeve, and the end of cathode sleeve is the cathode cap that has negative electrode.
As shown in Figure 2, directly-heated type electron gun of the present utility model, cathode assembly is made up of the negative electrode 1 that Base Metal heated filament band 2 and triplex carbonate coating are constituted.The triplex carbonate coating layer thickness is 5 microns, or between 5 to 15 microns; Base Metal heated filament band 2 is shaped as band shape, two ends are a spill to same direction bending 90 degree, its width is 0.6 millimeter, or between 0.6 to 0.8 millimeter, thickness is 0.02 millimeter, two ends are connected with heated filament lead-in wire 4 respectively, heated filament lead-in wire 4 is fixedly installed on the vitrifying support 3, and vitrifying support 3 melts admittedly on sintered glass ceramics 5, and two heated filaments lead-in wire 4 is 4.5 millimeters apart, its diameter is 1 millimeter of φ, and length is 8 to 12 millimeters.
As shown in Figure 3 and Figure 4, outside Base Metal heated filament band 2 two ends, be provided with ceramic gasket 6, ceramic gasket 6 shapes are the cross section and are oval cylindrical shell, end at negative electrode 1 one ends respectively is provided with a step along the major axis position, the first anode 8 is set on the step, its height is set according to the negative electrode 1 and the interval of the first anode 8, and the major axis internal diameter of ceramic gasket 6 is 4.5 millimeters, and heated filament lead-in wire 3 is vertically near its major axis inner surface.
As shown in Figure 6, for adopting the bipotential main lens structure that electron gun constituted of directly-heated type triplex carbonate oxide coating negative electrode, outside the cathode assembly 7 first anode 8 is set, cathode assembly 7 front sequences are provided with second plate 9, first focusing electrode 10 and third anode 12.
As shown in Figure 7, for adopting the unipotential main lens structure that electron gun constituted of directly-heated type triplex carbonate oxide coating negative electrode, outside the cathode assembly 7 first anode 8 is set, cathode assembly 7 front sequences are provided with second plate 9, first focusing electrode 10, second focusing electrode 11 and third anode 12.
As shown in Figure 8, adopt the flat CRT of the electron gun of above-mentioned direct-heated cathode, caliber is 20 millimeters, direct-heated cathode electron gun 13 is arranged in the neck 14 of flat CRT, electron gun 13 and neck 14 sealings by fusing, neck is coated with electrically conductive graphite in the upper end, and backplate 15 inner surfaces are coated with fluorescent material.To flat CRT energising and input signal, be subjected to the direct heating of Base Metal heated filament after about 1 to 2 second, when cathode temperature reaches about 850 ℃, just there is electronics to emit from negative electrode, these electronics are subjected to the acceleration of each electrode in the electron gun, converging action to form electron beam, be subjected to beam bombardment, excite coated light-emitting phosphor formation graph text information on the backplate 15, see through front panel 16 and just can observe directly the picture signal that has certain information on the backplate.
Triplex carbonate is on the high-melting-point molybdenum-nickel alloy metal substrate that is sprayed on as the Base Metal heated filament, the weight ratio of the main component of substrate is Mo: Ni: Fe=30: 62: 5, by miniature welding procedure and heated filament wire bonds together, the Base Metal material contains the reducing agent composition that can make the oxide reduction, wherein the content of magnesium metal is between 0.08 to 0.095%, silicone content is between 0.03 to 0.05%, and at hot time of cold conditions and electronics emission, resistance value is about 0.70 ohm.By brium carbonate, calcium carbonate, the formed triplex carbonate oxide weight ratio of strontium carbonate be: Ba: Sr: Ca=(47 to 58): (39 to 43): (3 to 10).Its carbonate particulate is an acicular texture, and particle size is 1.1 microns.Electron gun main lens is unipotential UPF main lens electron gun structure, its main lens is spaced apart between 4.20 to 5.50 millimeters, or main lens is bipotential BPF main lens electron gun structure, and its main lens voltage ratio is 10 to 15%, and main lens is spaced apart between 0.40 to 1.0 millimeter.
Electron gun is made up of cathod system and main lens system, and at its homogeneous tube structure, the design of cathod system is to consider that minimum crosspoint diameter and position thereof are optimized design; Its main lens system then is compatible consider homogeneous tube resolution and focusing performance thereof, considers the electron beam lens combination simultaneously and carries out matching Design with cathod system.
From electron optics, the big or small D of electron-baem spot on the panel
TMainly by the decision of three kinds of factors, the crosspoint D that has amplified exactly
X, spherical aberration D
SAWith space charge effect D
SCBe formulated as follows:
D
T＝((D
X+D
SA)
2+D
SC 2)
1/2 (1)
In (1) formula, D
XBe the crosspoint size of having amplified; D
SAUnder the spherical aberration influence, the blur circle size of the minimum that electron beam focuses on; D
SCBe the influence of space charge effect to spot definition.
Wherein, D
X=M * d
x(2)
d
xBe empty crosspoint size; M is a power of a lens.
D
SC＝C
S×α
3 (3)
In the formula, C
SBe coefficient of spherical aberration; α is an incidence angle.
In the applied example of the utility model, the operating current of its negative electrode is less.Therefore, can not consider the situation of space charge effect, this moment screen is gone up crosspoint and the minimum disperse garden beam diameter sum that the spot definition size has just equaled to amplify.
D
T＝D
X+D
SA (4)
Above thereby (1) to (4) formula as can be known, in order to satisfy the display requirement of flat display tube, when the design electron gun, promptly will dwindle minimum crosspoint diameter D
XTo reduce the focusing disperse garden size of electron beam simultaneously.In the application of reality, will optimize cathod system, increase main lens diameter, reduce spherical aberration.According to above some, we have designed and have been used for gun cathode system and the main lens structure that φ 20 flat tubes or display tube directly perceived are used.Its typical work condition is: E
b=6KV, E
C1=OV, E
C2=300V, E
f=0.6V, I
f=280mA.
Directly-heated type electron gun of the present utility model and cathode ray tube thereof have low-power consumption, fast, the energy-conservation characteristics of toggle speed; Its neck diameter is φ 20, and simultaneously main lens system has big direct electronic beam gauge structure, and the electron-baem spot size is little, uses the cathode ray tube of this electron gun, can make display frame have high definition, spherical aberration is little, distortion is little feature.Can be widely used in fields such as the demonstration of driving cabin instrument, image tracing display.
Claims (10)
1. directly-heated type electron gun, comprise cathode assembly, it is characterized in that: the negative electrode of described cathode assembly is the oxide coating that is coated on the Base Metal heated filament band, and the two ends of Base Metal heated filament band are connected with the heated filament lead-in wire respectively, and the heated filament lead-in wire is fixedly installed on the vitrifying support.
2. directly-heated type electron gun according to claim 1 is characterized in that: described Base Metal heated filament belt shape is for banded, and two ends are spill to same direction bending 90 degree.
3. directly-heated type electron gun according to claim 2, it is characterized in that: the width of described Base Metal heated filament band is 0.6 to 0.8 millimeter, thickness is 0.02 millimeter, the one side that the vitrifying support is relative with negative electrode also is provided with the sintered glass ceramics body, two heated filaments lead-in wire is 6 millimeters apart, and its diameter is 1 millimeter of φ.
4. directly-heated type electron gun according to claim 3 is characterized in that: described oxide coating is the triplex carbonate oxide coating.
5. directly-heated type electron gun according to claim 4 is characterized in that: described triplex carbonate oxide coating thickness is 5 to 15 microns.
6. directly-heated type electron gun according to claim 5 is characterized in that: the prefocus lens assembly of described cathode assembly comprises the first anode, second plate and first focusing electrode; The main lens system of cathode assembly comprises second focusing electrode and third anode.
7. directly-heated type electron gun according to claim 6, it is characterized in that: described Base Metal heated filament band is provided with ceramic gasket outside the two ends, its shape is the cross section and is oval cylindrical shell, minister's shaft position respectively is provided with the interval step of the negative electrode and the first anode in the top, the major axis internal diameter of ceramic gasket is 4.5 millimeters, and heated filament goes between vertically near its major axis inner surface.
8. cathode ray tube, comprise electron gun, it is characterized in that: the negative electrode of the cathode assembly of described electron gun is the oxide coating that is coated on the Base Metal heated filament band, and the two ends of Base Metal heated filament band are connected with the heated filament lead-in wire respectively, and the heated filament lead-in wire is fixedly installed on the vitrifying support.
9. cathode ray tube according to claim 8 is characterized in that: the caliber of described cathode ray tube is 20 millimeters.
10. cathode ray tube according to claim 9 is characterized in that: described cathode ray tube is a flat CRT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420045637 CN2705888Y (en) | 2004-04-30 | 2004-04-30 | Direct heating electronic gun and its cahtode ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420045637 CN2705888Y (en) | 2004-04-30 | 2004-04-30 | Direct heating electronic gun and its cahtode ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2705888Y true CN2705888Y (en) | 2005-06-22 |
Family
ID=34851028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420045637 Expired - Fee Related CN2705888Y (en) | 2004-04-30 | 2004-04-30 | Direct heating electronic gun and its cahtode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2705888Y (en) |
-
2004
- 2004-04-30 CN CN 200420045637 patent/CN2705888Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1073275C (en) | Color cathode ray tube | |
| CN1020058C (en) | Indirectly heated cathode assembly and its accociated electron gun structure | |
| US5866975A (en) | Low-temperature cathode having an emissive nanostructure | |
| CN2705888Y (en) | Direct heating electronic gun and its cahtode ray tube | |
| CN1042622A (en) | Cathode ray tube | |
| CN1143349C (en) | Cathode-ray tube with improved cathode | |
| JP2002373569A (en) | Electron source and its manufacturing method | |
| CN1174462C (en) | Cathode and its manufacture method, and kinescope using the cathode | |
| EP1508910B1 (en) | A gun with a cold cathode | |
| den Engelsen | The temptation of field emission displays | |
| CN1159746C (en) | Indirectly heated cathode and cathode ray tube using same | |
| CN1185649A (en) | Low-power dipping-type cathod for cathod-ray tube | |
| CN1275279C (en) | Cathode ray tube | |
| JP2005285587A (en) | Electrode for cold cathode tube and cold cathode tube using this electrode | |
| CN1162890C (en) | Color CRT having internal bleeder resistance | |
| CN1762035A (en) | Indirectly heated cathode and cathode ray tube having same | |
| CN1256504A (en) | Cathode for electron gun | |
| CN1300821C (en) | Cathode ray tube and method for manufacturing the same | |
| CN1953135A (en) | Electron emission display device | |
| CN1150323A (en) | Cathode ray tube | |
| CN1225768C (en) | Conic portion and neck sealing body for projecting tube | |
| CN1252785C (en) | Cathode ray tube with unipotential focus electronic gun | |
| CN1622265A (en) | Carbon nano tube field emission panel display with focusing electrode structure and fabrication process thereof | |
| JP3322465B2 (en) | Cathode assembly and method of manufacturing the same | |
| JPH11273549A (en) | Indirect heated cathode and cathode-ray tube using the cathode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |