CN1849689A - Tension mask frame for a cathode-ray tube (CRT) having transverse scan - Google Patents
Tension mask frame for a cathode-ray tube (CRT) having transverse scan Download PDFInfo
- Publication number
- CN1849689A CN1849689A CNA038269333A CN03826933A CN1849689A CN 1849689 A CN1849689 A CN 1849689A CN A038269333 A CNA038269333 A CN A038269333A CN 03826933 A CN03826933 A CN 03826933A CN 1849689 A CN1849689 A CN 1849689A
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- China
- Prior art keywords
- frequency distribution
- core
- marginal portion
- mask
- peripheral
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0738—Mitigating undesirable mechanical effects
- H01J2229/0744—Vibrations
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- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
A high aspect ratio cathode-ray tube (CRT) including a luminescent screen, an aperture mask configured for transverse scan, an electron gun and a magnetic deflection yoke. The electron gun and the magnetic deflection yoke are positioned so that the electron beams generated in the gun scan a rectangular raster across the luminescent screen parallel to the tube minor axis (transverse scan) to improve the current requirements for the magnetic deflection yoke.
Description
The cross reference of related application
The application is the unsettled U.S. Patent application series No.09/797 that being entitled as of submitting to March 1 calendar year 2001 " is used to have the tensioned mask of the cathode ray tube of improved vibration damping ", 229 part continuation application, and above-mentioned application is at this as a reference.
Invention field
The present invention relates generally to cathode ray tube (CRT), and relate in particular to stretching (tension) shadow mask with transversal scanning.
Background of invention
Color picture tube comprises electron gun, and this used in electron gun is in producing three-beam electron-beam, and they are directed on the phosphor screen of picture tube.Outside magnetic deflection coil makes three-beam electron-beam be subjected to the action of a magnetic field, and magnetic field makes electron beam carry out horizontal and vertical scanning in fluoroscopic rectangular raster.This phosphor screen is positioned on the inner surface of viewing screen, and comprises the array of elements of the emission fluorescent body of three kinds of different colours.
Between electron gun and phosphor screen, aperture mask is set so that every beam electrons bundle only hits the phosphor elements with that beam electrons Shu Youguan.Aperture mask is such as steel or dilval (INVAR
) such sheet metal, the fluoroscopic inner surface of itself and picture tube is parallel.Aperture mask can be that shaping is processed or stretch process.
Some cathode ray tubes (CRTs) comprise the high depth-width ratio (for example, 16: 9 depth-width ratios) that is used for viewing screen.So the high depth-width ratio that is used for viewing screen needs magnetic deflection coil to utilize high deflection angle to come horizontal and vertical scanning at the fluoroscopic rectangular raster that strides across picture tube.Being used for the high deflection angle of horizontal and vertical scanning in striding across fluoroscopic rectangular raster has improved the current requirement of deflecting coil.The high current requirement that is used for deflecting coil has improved the complexity and the cost of deflecting coil, chassis electronics, and operation cathode ray tube required power consumption, and this is that people are undesirable.
Therefore, for the cathode ray tube that comprises high depth-width ratio that is used for display screen, there are needs to the current requirement of the improvement that is used for magnetic deflection coil.
Summary of the invention
The present invention relates to the cathode ray tube (CRT) of high depth-width ratio, it comprises phosphor screen, is configured to the aperture mask of transversal scanning, electron gun and magnetic deflection coil.Electron gun and magnetic deflection coil are set, make the electron beam scanning that produces in electron gun by the current requirement of fluoroscopic rectangular raster with the improvement magnetic deflection coil, this phosphor screen is parallel with picture tube minor axis (transversal scanning).
The aperture mask that is arranged to transversal scanning is arranged between electron gun and the phosphor screen so that every beam electrons bundle only hits the phosphor elements relevant with that electron beam.This aperture mask is the shadow mask of a stretching, and it has core and marginal portion.Core has central frequency distribution, and the marginal portion has peripheral frequency distribution.Central frequency distribution is bigger than peripheral frequency distribution.Frequency distribution from the marginal portion to the core represents by a parabolic formula, and wherein the variation range delta between the minimum value of the frequency distribution of the peak value of the frequency distribution of core and marginal portion approximately is in the closed interval of 8Hz≤Δ≤12Hz.
The simple declaration of accompanying drawing
Can understand the present invention at an easy rate with reference to the following detailed description in conjunction with the drawings, wherein:
Fig. 1 is the end view of color picture tube in the part of axial section, and this color picture tube comprises according to tensioned mask-framework of the present invention-assembly;
Fig. 2 is the plane graph of tensioned mask-framework-assembly of Fig. 1 according to an aspect of the present invention;
Fig. 3 describes the condition shape figure that various mask tension distribute;
Fig. 4 describes is the block diagram of the mask tension scope that limited by scanning frequency;
Fig. 5 compares with longitudinal scanning, the shadow mask frame design parameter list of the cathode ray tube (CRT) of several high depth-width ratios (16: 9) of use transversal scanning.
For ease of understanding, it is public similar elements that identical Reference numeral is all specified these figure in possible place.
Describe in detail
What Fig. 1 represented is the cathode ray tube 10 with glass shell 12, and this glass shell 12 comprises phosphor screen screen dish 14 before the rectangle, and the neck 16 that is connected by rectangular funnel 18.Funnel 18 has the internal conductive coatings (not shown), and it extends to neck 16 from anode button 20.Phosphor screen 14 comprises watches preceding phosphor screen 22 and peripheral flange or sidewall 24, and this sidewall 24 is encapsulated into funnel 18 by glass dust 26.Tricolour phosphor screen 28 is formed on the inner surface of preceding phosphor screen 22.Phosphor screen 28 is the line phosphor screens with photoluminescence line of arranging according to three-in-one group (triads), each three-in-one group photoluminescence line that comprises each color in this three look.The tensioned mask frame assembly 30 that is provided for transversal scanning can be releasably attached to relevant phosphor screen 28 with predetermined interval.Electron gun 32 (with dashed lines schematically shows among Fig. 1) is installed in the central authorities of neck 16, so that produce the electron beam of three in-lines, central beam and two lateral bundles arrive phosphor screens 28 along the path of assembling by shadow mask 30.
The tensioned mask frame mounting 30 that is used for transversal scanning illustrates in greater detail at Fig. 2, and itself and peripheral frame 39 are connected to each other, and this peripheral frame 39 comprises 36,38 and two minor faces 40,42 in two long limits.The long limit of two of tensioned mask frame mounting 30 36,38 is parallel with the central longitudinal axis X of picture tube.Tensioned mask comprises the mesh part, and this mesh partly comprises a plurality of metal tapes 44, has a plurality of elongated slits 46 between this metal tape, and its minor axis with tensioned mask device 30 is parallel.Elongated slit 46 also can be selected parallel with the major axis of tensioned mask device 30.
Particularly, the mesh of tensioned mask device 30 shown in Figure 2 partly is a connecting rod or network.Tensioned mask 30 has: core 50; About 0.5 inch shadow mask marginal portion 52, edge apart from the minor face 40,42 of framework; And apart from about 1.0 inches shadow mask marginal portion 51, edge on the long limit 36,38 of framework.These two shadow mask marginal portions 52 are parallel with the central minor axis Y of picture tube 10.These two shadow mask marginal portions 51 are parallel with the central longitudinal axis X of pipe 10.These two shadow mask marginal portions 52 40,42 link to each other with peripheral frame 39 along both sides.
(central minor axis, Y) natural frequency of dimension distributes provides a kind of useful method that any picture tube is compared with other picture tube, and should not manage size to stride across tensioned mask 30 arbitrary fully vertical.In fact, it is the corresponding tension distribution of tensioned mask 30 and the function of horizontal dimensions that natural frequency distributes, and is the common metric of expression picture tube microphonic behavior.
Stride across central minor axis Y to be used for that natural frequency that transversal scanning uses distributes be a level and smooth and continuous parabolic function basically.The peripheral frequency distribution that natural frequency distributes and to comprise the central frequency distribution that is used for core 50 and to be used for marginal portion 51, wherein to infer (constructively) bigger than the value of peripheral frequency distribution for the value of central frequency distribution.The preferably about 10Hz of difference between the maximum of central frequency distribution and the minimum value of peripheral frequency distribution.
When center part 50 is in the stretching following time bigger than shadow mask marginal portion 51, this state is referred to as shadow mask " (frown) frowns ", and shadow mask " is frowned " and had a basic oscillation mode, and this oscillation mode relates generally to the marginal portion 51 of shadow mask 30.Border attenuation factor (BDS), i.e. vibration isolator, damp vibrational energy effectively triggers because BDS is vibration by the marginal portion 51 of shadow mask 30.
When center part 50 is in the stretching following time littler than shadow mask marginal portion 51, this state is referred to as shadow mask " smile ".Same, the value of central frequency distribution is lower than the value of peripheral frequency distribution.Because vibration shadow mask 30 has the fundamental mode of the motion domination that is subjected to core 50, and does not trigger BDS, so oscillatory extinction is faint when being in " smile " state.
When natural frequency was evenly distributed or is smooth, the value of central frequency distribution and peripheral frequency distribution was similar basically.Such example is difficult to realize.In addition, in the manufacture process of tensioned mask 30 or the trickle change of the tension distribution that causes of the duration of work of cathode ray tube just may produce " smile ", this is not desirable.
Fig. 3 is the column diagram 300 of the various tension distribution model shapes of explanation.Figure 30 0 is limited by normal displacement (axle 302) and minor axis location (axle 304).Particularly, Figure 30 0 has represented which part of tensioned mask 30 is caused that by oscillatory excitation smooth " smile " or " frowning " stretches.At core 50, the tensioned mask 30 of " smile " (curve 306) has shown that the tensioned mask 30 than " frowning " (curve 308) has much more vibration.In addition, in the core 50 of shadow mask 30, has more vibration than tensioned mask 30 with " frowning " with even tension distribution (curve 310).
Between those resonance frequencys that the tensioned mask 30 with " frowning " is had, has wideer interval than tensioned mask 30 with " smile " or flat distribution.Therefore, when having vibration, can not present to second pattern from the energy of first pattern of disturbance, thereby not prolong oscillation effect.
Arranged according to the present inventionly be used for transversal scanning for use in being expressed as in the about 80Hz tension distribution of generation parabolical " frowning " in about 90Hz frequency range:
Wherein (L represents tensioned mask 30 along half of the total length of minor axis to f (y) expression y for minor axis, the Y) frequency distribution on, and y represents the position of the minor axis from-L to+L, and wherein the absolute value of L is normalized to 1.Preferred embodiment has following provisions:
92 〉=A 〉=88 expression formulas 2
12 〉=B 〉=8 expression formulas 3
12 〉=f (y
Max)-f (y
Min) 〉=8 expression formula 4
F (y
Max) and f (y
Min) be illustrated respectively in the peak value of frequency distribution of core 50 and the minimum value of 52 frequency distribution in the marginal portion.Preferably, the frequency distribution of core 50 and and the difference of 52 frequency distribution in the marginal portion keep 8Hz at least.
When mask frequency vibrations occur in or near scanning frequency or during near a harmonic wave, will cause the beat effect, wherein low amplitude modulation becomes clearly.Fig. 4 provides some guidances when structure has the tensioned mask of good microphonic performance.The mask tension scope that block diagram 400 expressions among Fig. 4 are limited by scanning frequency (axle 402).Particularly, different posts occupy the scanning frequency that some has an about 20Hz vibration isolator.Thermal agitation (post 404) occurs in 0Hz in the frequency range of about 40Hz.50Hz European television broadcast format 1H phase extension wire (PAL) (post 406) does not comprise the frequency range from about 40Hz to about 60Hz.60Hz ABC American Broadcasting Co. television system 1H (NTSC) (post 408) does not comprise the frequency range from about 50Hz to about 70Hz.100Hz European television broadcast format 2H PAL (post 410) does not comprise the frequency range from about 90Hz to about 110Hz.120Hz ABC American Broadcasting Co. television system 2H NTSC (post 412) does not comprise the approximately frequency range from 110Hz to about 130Hz.In order to utilize the approximately frequency range from 130Hz to about 200Hz, the frame weight that needs are extra is because framework only in this way could sufficiently arrive these higher frequencies with mask tension.Figure 40 0 is illustrated in 70Hz to having a narrow 20Hz window (space 416) between the 90Hz, and the shadow mask frequency is enough to standard scan frequency and their harmonic wave are kept apart in this frequency range.
And, because amplitude of oscillation and mask tension are inversely proportional, therefore wish that total mask tension is high as much as possible.The 10Hz edge of in expression formula 4, describing-provide the solution of wishing to the difference at-center, thus vibration when keeping essential " frowning " tension distribution, reduced.
Fig. 5 has summarized the Frame Design parameter of the cathode ray tube of several high depth-width ratios (16: 9).Particularly, compare, for transversal scanning provides mask stress (psi) and shadow mask load (lbf) as the function of two frequencies (for example, 80Hz and 90Hz) as cathode ray tube longitudinal scanning with several different sizes.Shadow mask can be with the dilval that for example has about 0.004 inch thickness (for example, INVAR
) make.Be used for the stress on the tensioned mask 30 of pipe of various sizes by change, the microphonic that the shadow mask that can obtain expecting is used.The present invention in fact can all existing pipe sizes (for example, W76, W86 and W97, and other) in accomplished.More particularly, have a kind of hierarchical relationship in the pipe of various sizes, wherein for transversal scanning and longitudinal scanning, the pipe that less pipe is bigger can be realized the frequency distribution of expection under lower mask stress load.For example, under the frequency of about 90Hz, the film luminescent screen tube that W76 is 30 inches stands still less mask stress and frame load than the film luminescent screen tube of 34 inches of W86 at about 80Hz.Similarly, under the frequency of about 90Hz, the film luminescent screen tube that W86 is 34 inches stands still less mask stress and frame load than the film luminescent screen tube of 38 inches of W97 at about 80Hz.
In addition, in the pipe of various sizes, have a kind of hierarchical relationship, wherein use the pipe of transversal scanning to need higher mask stress load to realize the frequency distribution of expecting than the pipe that uses longitudinal scanning.For example, under the frequency of about 90Hz, the film luminescent screen tube that W76 who uses transversal scanning is 30 inches stands higher mask stress and frame load than the film luminescent screen tube of 30 inches of the W76 of a use longitudinal scanning at about 80Hz.Under the frequency of about 90Hz, the film luminescent screen tube that the W86 of use transversal scanning is 34 inches stands higher mask stress and frame load than the film luminescent screen tube of 34 inches of the W86 that uses longitudinal scanning at about 80Hz.Similarly, under the frequency of about 90Hz, the film luminescent screen tube that the W97 of use transversal scanning is 38 inches stands higher mask stress and frame load than the film luminescent screen tube of 38 inches of the W97 that uses longitudinal scanning at about 80Hz.
Owing to illustrate and describe in detail the embodiment that comprises that the present invention instructs, so those skilled in the art can design the embodiment that other change to some extent at an easy rate, these embodiment still comprise these instructions and do not deviate from spirit of the present invention.
Claims (14)
1. cathode ray tube (CRT) has the glass shell that limited by phosphor screen screen dish and neck, is formed on the tricolour phosphor screen on this phosphor screen screen inner surface and is arranged in neck and towards fluoroscopic electron gun, comprising:
One is fixed to the tensioned mask that peripheral frame is configured to transversal scanning, wherein this tensioned mask has core and near the marginal portion of the opposing ends of this tensioned mask, this marginal portion has peripheral frequency distribution and this core has central frequency distribution, wherein this central frequency distribution is bigger than this peripheral frequency distribution, thereby improves the oscillatory extinction of shadow mask.
2. the described cathode ray tube (CRT) of claim 1, wherein the frequency distribution from the marginal portion to the core is represented by parabolic formula, wherein is at least 8Hz in the frequency distribution of core and the hunting range between the frequency distribution in the marginal portion.
3. the described cathode ray tube (CRT) of claim 2, wherein the central frequency distribution scope be about 92Hz to about 88Hz, and the peripheral frequency distribution scope is to about 84Hz from about 76Hz.
4. the described cathode ray tube (CRT) of claim 2, wherein this hunting range is not more than 12Hz.
5. the described cathode ray tube (CRT) of claim 4, wherein this hunting range approximately is 10Hz.
6. tensioned mask that is used for cathode ray tube (CRT) comprises:
A peripheral frame;
One is fixed to peripheral frame and is arranged to transversal scanning and has core and the tensioned mask of marginal portion, this marginal portion is near two opposing ends of tensioned mask, this core has central frequency distribution, this marginal portion has peripheral frequency distribution, wherein and the frequency distribution from marginal portion to core bigger than this peripheral frequency distribution of this central frequency distribution represented by a parabolic formula, and wherein the hunting range Δ between the minimum value of the peak value of the frequency distribution of core and marginal portion frequency distribution is in the closed interval of about 8Hz≤Δ≤12Hz.
7. the described tensioned mask of claim 6, wherein the central frequency distribution scope be from about 92Hz to about 88Hz, and the peripheral frequency distribution scope is to about 84Hz from about 76Hz.
8. the described tensioned mask of claim 7, wherein central frequency distribution is approximately 90Hz, and peripheral frequency distribution is approximately 80Hz.
9. the described tensioned mask of claim 6, wherein hunting range approximately is 10Hz.
10. method that is used to improve the cathode ray tube (CRT) oscillatory extinction comprises:
A tensioned mask that is arranged to transversal scanning is fixed to peripheral frame, makes the core of this tensioned mask have the big central frequency distribution of peripheral frequency distribution than the end portion of tensioned mask.
11. the described method of claim 10, wherein the frequency distribution from the marginal portion to the core is represented by a parabolic formula, and is at least 8Hz between the frequency distribution of core and the hunting range Δ between the frequency distribution of marginal portion.
12. the described method of claim 11, wherein the hunting range Δ between the minimum value of the peak value of the frequency distribution of core and marginal portion frequency distribution is in the closed interval of about 8Hz≤Δ≤12Hz.
13. the described method of claim 12, wherein the central frequency distribution scope is that about 92Hz arrives about 88Hz, and the peripheral frequency distribution scope is that about 76Hz is to about 84Hz.
14. the described method of claim 12, wherein hunting range approximately is 10Hz.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2003/026029 WO2005020270A1 (en) | 2003-08-20 | 2003-08-20 | Tension mask frame for a cathode-ray tube (crt) having transverse scan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1849689A true CN1849689A (en) | 2006-10-18 |
Family
ID=34215339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA038269333A Pending CN1849689A (en) | 2003-08-20 | 2003-08-20 | Tension mask frame for a cathode-ray tube (CRT) having transverse scan |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1656686A4 (en) |
| JP (1) | JP2007521609A (en) |
| CN (1) | CN1849689A (en) |
| AU (1) | AU2003262732A1 (en) |
| WO (1) | WO2005020270A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8235156B2 (en) | 2007-05-26 | 2012-08-07 | Micheal James Koss | Retrofitable ROPS reinforcement structure for cab raiser interface |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3300669B2 (en) * | 1998-09-01 | 2002-07-08 | 松下電器産業株式会社 | Color cathode ray tube |
| TW480519B (en) * | 1999-10-21 | 2002-03-21 | Matsushita Electric Ind Co Ltd | Cathode ray tube and image display apparatus using the samd |
| EP1237176A1 (en) * | 1999-10-22 | 2002-09-04 | Matsushita Electric Industrial Co., Ltd. | Cathode-ray tube and image display comprising the same |
| JP2002373598A (en) * | 2001-06-13 | 2002-12-26 | Nec Kansai Ltd | Shadow mask structural body and color cathode-ray tube |
-
2003
- 2003-08-20 JP JP2005508274A patent/JP2007521609A/en active Pending
- 2003-08-20 EP EP03818354A patent/EP1656686A4/en not_active Withdrawn
- 2003-08-20 CN CNA038269333A patent/CN1849689A/en active Pending
- 2003-08-20 WO PCT/US2003/026029 patent/WO2005020270A1/en active Application Filing
- 2003-08-20 AU AU2003262732A patent/AU2003262732A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005020270A1 (en) | 2005-03-03 |
| EP1656686A4 (en) | 2008-07-16 |
| JP2007521609A (en) | 2007-08-02 |
| EP1656686A1 (en) | 2006-05-17 |
| AU2003262732A1 (en) | 2005-03-10 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |