CN1047688C - Color cathode ray tube of shadow mask type - Google Patents
Color cathode ray tube of shadow mask type Download PDFInfo
- Publication number
- CN1047688C CN1047688C CN92109014A CN92109014A CN1047688C CN 1047688 C CN1047688 C CN 1047688C CN 92109014 A CN92109014 A CN 92109014A CN 92109014 A CN92109014 A CN 92109014A CN 1047688 C CN1047688 C CN 1047688C
- Authority
- CN
- China
- Prior art keywords
- panel
- shadow mask
- screen
- axis
- ray tube
- 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
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Classifications
-
- 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
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/86—Vessels and containers
- H01J2229/8613—Faceplates
- H01J2229/8616—Faceplates characterised by shape
- H01J2229/862—Parameterised shape, e.g. expression, relationship or equation
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
Curve surface shapes ZX, ZY on the long axis and short axis of at least the outer surface of a face plate are approximated by ZX=A1X2+A2X4+A3X6 and ZY=A4Y2+A5Y4+A6Y6, and the curved surface shapes PX, PY of at least the outer surface of the face plate panel at points (X=X1, Y=Y1) of effective screen boundary portions are given by PX=A1X12/(A1X12+A2X14+A3X16) and PY=A4Y12/(A4Y12+A5Y14+A6Y16), wherein 0.6<PX</=0.9 and 0.6</=PY</=1.0 are satisfied. The curvature radii R (mm) of the effective screen boundary portion of the short side and long side satisfy the relationship: 2.0 (42.5 V+45.0)<R</=4.0 (42.5 V+45.0), where the effective diagonal diameter of the face plate panel is V (inches). This enables a flatter periphery, less distorted panel surface and less doming effect.
Description
The present invention relates to a kind of color cathode ray tube of shadow mask type, thereby particularly a kind of has a color cathode ray tube of shadow mask type that shape that so-called flat horizontal surface makes the panel panel almost is the plane.
The cathode ray tube that color image display is used (to call color cathode ray tube in the following text) normally is made of faceplate part, neck part and glass wimble fraction.Faceplate part is an imaging screen, neck partly is used for installing electron gun, the glass wimble fraction partly couples together faceplate part (panel panel) and neck, the glass wimble fraction is equipped with deflection system, by the electron beam that this deflection system deflection electron gun is launched, the phosphor screen that its scanning is formed on panel inner surface.
On the panel inner surface planar mask is housed.Planar mask is color selective electrode, and its sweep is near the profile of panel surface curvature part, impacts position on the phosphor screen to limit a plurality of electron beams that emit from electron gun.
The electron gun that is contained in the neck part has various electrodes, for example, cathode electrode, control electrode, poly-electrode and accelerating electrode, electron gun is just with being added to the electron beam of the Signal Regulation of control electrode from cathode electrode, makes the cross section of electron beam form desired shape and provides energy to electron beam by poly-electrode and accelerating electrode, makes it impact phosphor screen.The deflection system that is located at the glass wimble fraction make electron beam from electron gun to fluoroscopic way in the horizontal direction with the vertical direction upper deflecting, on phosphor screen, to form image (referring to for example Japanese publication 215640/1984).
Modern color cathode ray tube tends to have so-called flat horizontal surface, and the panel panel that promptly forms visual place almost is the plane.
The flatness of color cathode ray tube of shadow mask type panel panel receives the influence of panel panel periphery part curvature greatly.Therefore, along with reducing of panel periphery part curvature, increased the flat sensation of panel panel.Yet, in order to satisfy the curvature of panel panel, shadow mask also will be made flat pattern, and this has improved the landing error that electron beam causes because of the shadow mask thermal expansion (phenomenon arches upward), thereby make the surround lighting image distortion that is reflected on the panel panel outer surface, be difficult to demonstrate high-quality image.Japan's publication 232247/1988 discloses a kind of panel panel and has made color cathode ray tube flat, that the phenomenon that arches upward makes moderate progress.
According to above-mentioned communique invention disclosed, the shape three dimensions The Representation Equation of panel panel surfaces externally and internally, wherein the X-axis line is long axis (horizontal axis), and the Y-axis line is minor axis (vertical axis), and z axis is the axis of pipe.In other words, the curve form Z on X-axis line and the Y-axis line
XAnd Z
YCan use Z haply
X=A
1X
2+ A
2X
4And Z
Y=A
3Y
2+ A
4Y
4Expression, and at a point (X=X of the effective interface portion of screen
1Y=Y
1) the curve form P that forms
XAnd P
YRoughly can use P
X=A
1X
2/ (A
1X
2+ A
2X
4) and P
Y=A
3Y
2/ (A
3Y
3+ A
4Y
4) expression, wherein the effective interface portion of screen is the interface between screen live part and the perimeter part, above-mentioned constant A
1, A
2, A
3And A
4Obtain and make it satisfy inequality 0.3≤P
X(X=X
1)≤0.6 and 0.95≤P
Y(Y=Y
1)≤1.0.In addition, the almost equal arch of panel panel outer surface radius of curvature R (millimeter), and when effective diagonal diameter is V (millimeter), can satisfy relational expression 1.5 (42.5V+45.0)≤R≤2.0 (42.5V+45.0), thereby reduce the phenomenon that arches upward of shadow mask, the intensity of raising panel and flat improves reflexing to the lip-deep surround lighting image of panel.
Yet, in having the common color cathode ray tube of above-mentioned curve form, when wanting to be in outside above-mentioned R (millimeter) scope by the radius of curvature that makes peripheral part, when further making the panel panel become more flat, reflection surround lighting image on the outer surface distorts greatly, and particularly local distortion increases greatly.In addition, because mask arch, landing error increases, the quality of the shown image of grievous injury.
The objective of the invention is to solve the problems referred to above of prior art, a kind of such color cathode ray tube of shadow mask type is provided, this ray tube has not only improved the distortion situation of the surround lighting image that is reflected on the panel panel outer surface, and can demonstrate high-quality image by the degree of arching upward that reduces shadow mask.
For achieving the above object, color cathode ray tube of shadow mask type provided by the invention comprises the rectangle panel panel that is characterized by long axis and minor axis, described panel panel has the screen live part and centers on the peripheral part of screen live part, be that (wherein the X-axis line is the long axis of rectangle panel panel during with the three dimensions The Representation Equation for the curve form of outer surface at least wherein when the panel panel, the Y-axis line is the minor axis of panel panel, z axis is the axis of pipe), the curve form Z on long axis and minor axis
XAnd Z
YRoughly can be represented by the formula:
Z
x＝A
1X
2+A
2X
4+A
3X
6
Z
Y=A
4Y
2+ A
5Y
4+ A
6Y
6And when the panel panel be the point (X=X of outer surface at least in the effective interface portion of screen
1, Y=0) with (X=0, Y=Y
1) the curve form P that locates
XAnd P
YCan following formula:
P
X＝A
lX
1 2/(A
1x
1 2+A
2X
1 4+A
3X
1 6)
P
Y=A
4Y
1 2/ (A
4Y
1 2+ A
5Y
1 4+ A
6Y
1 6) when representing, constant A
1, A
2, A
3, A
4, A
5And A
6Should satisfy following formula:
0.5≤P
X(X＝X
1)≤0.9
0.6≤P
Y(Y＝Y
1)≤1.0
Wherein the effective interface portion of screen is the interface between screen live part and the peripheral part.
In addition, minor face screen interface part and long side screen interface portion on the panel panel outer surface, the arc curvature of this two interface portion is almost equal, and when effective catercorner length of panel panel was V (millimeter), the radius of curvature R of each arc (millimeter) satisfied following relationship:
2.0(42.5V+45.0)≤R≤4.0(42.5V+45.0)
By setting up the shape Z of panel panel surfaces externally and internally
X, Z
Y, the curve form P at a some place on the effective interface of panel
X, P
YAnd radius of curvature R, it is in the above-mentioned scope, can reduce the distortion degree that is reflected in the lip-deep surround lighting image of peripheral part, improve the anti-characteristic that arches upward of the curved surface profile shadow mask consistent, thereby draw the flat high color cathode ray tube of visual display performance with the curved surface of panel panel.
Fig. 1 is the front view of color cathode ray tube of shadow mask type panel panel of the present invention.
Fig. 2 is the cutaway view of panel shown in Figure 1, and wherein Fig. 2 (a) is the cutaway view along the intercepting of X-X line, and Fig. 2 (b) is the cutaway view along the intercepting of Y-Y line.
Fig. 3 is the effective interface portion of screen of color cathode ray tube of shadow mask type panel panel of the present invention, wherein Fig. 3 (a) is the cutaway view along the effective interface portion intercepting of the long side screen of parallel long axis X-X, and Fig. 3 (b) is the cutaway view along the effective interface portion intercepting of the minor face screen that is parallel to minor axis Y-Y.
Fig. 4 is the panel panel of color cathode ray tube of shadow mask type of the present invention and the shadow mask cutaway view in the picture diagonal direction.
Fig. 5 is the schematic diagram in order to the relation between explanation deflecting coil characteristic and the aperture mask curved surface characteristic.
Fig. 6 is the cutaway view in order to the structure of explanation shadow mask type cathode-ray tube of the present invention.
Specify color cathode ray tube of shadow mask type of the present invention by an embodiment now.
Fig. 1 is the front view of the color cathode ray tube of shadow mask type panel panel of one embodiment of the invention.Fig. 2 (a) is the cutaway view of Fig. 1 along the intercepting of X-X line, and Fig. 2 (b) is the cutaway view along the intercepting of Y-Y line, wherein, number 1 indication panel faceplate panels, 2 expression screen live parts, 3 expression peripheral parts, 32 expression minor face peripheral parts, the long limit of 32 expressions peripheral part, the effective interface portion of 4 expression screens, the effective interface portion of 41 expression minor face screens, the effective interface portion of the 42 long side screens of expression, X-X represents long axis (X-axis line), and Y-Y represents minor axis (Y-axis line), and V represents catercorner length (millimeter).
Among Fig. 1 and 2, panel panel 1 is almost rectangular, with X-axis line (X-X) as long axis, as minor axis, the screen live part 2 of panel has a fluorescent surface, is formed with the three fluorescence material on the inner surface of fluorescent surface with Y-axis line (Y-Y), the surfaces externally and internally of fluorescent surface, shape is almost equal, when electron beam impacts on the screen live part 2, just has image to show.
What the outer surface of panel panel of the present invention was total can be represented by the formula:
Z=A1X
2+A
2X
4+A
3X
6+A
4Y
2+A
5Y
4+A
6Y
6+A
7X
2Y
2
+A
8X
4Y
2+A
9X
6Y
2+A
10X
2Y
4+A
11X
4Y
4+A
12X
6Y
4
+A
13X
2Y
6+A
14X
4Y
6+A
15X
6Y
6
Wherein Z represents to suppose that face plate center is zero, during the outer surface off-center with respect to the slippage at center.Shown in following formula like that, curved surface Z and 15 coefficient A
1To A
15Relevant.Coefficient reaches 15 and means that nearly 15 possibility is arranged; In other words, for choosing best coefficient, need through a large amount of valuation processes, thereby make the enforcement of cathode ray tube be difficult to carry out.
The present invention is with such basis that is found to be, be the coefficient of surface equation on x axis and Y-axis line and the equivalent curvature of peripheral part, flat and the minimizing of panel panel surface is played an important role on arching upward, and determine as long as suitably choose each coefficient on X-axis line and the Y-axis line and the equivalent curvature of peripheral part, can reduce the phenomenon that arches upward, make panel flat.
By the present invention, when effective catercorner length is V (millimeter), (among the 42.5V+45.0)≤interior value of R≤4.0 (42.5V+45.0) scope that the radius of curvature R (millimeter) of the minor face of panel panel outer surface and the effective interface portion of long side screen can get 2.0.Here, Z
XAnd Z
YExpression panel 1 is along the curve form of long axis X-X and minor axis Y-Y usefulness three dimensions The Representation Equation, i.e. Z
X=A
1X
2+ A
2X
4+ A
3X
6, Z
Y=A
4Y
2+ A
5Y
4+ A
6Y
6
Here, R can determine as follows.That is, the long limit R among Fig. 3 (a) can use R=(dx
2Ten x
1 2)/2dX obtains, and the minor face R among Fig. 3 (b) can use R=(dy
2+ y
1 2)/2dy obtains.
Suppose that the curve form that the effective interface portion 4 of screen almost is parallel to long axis x-X and minor axis Y-Y represents with three dimensions equation P X and PY.The same curvature of carrying above the employing and effective diagonal diameter, curve form P
X, P
YAvailable P
X=A
1X
1 2/ (A
1X
1 2+ A
2X
1 4+ A
3X
1 6), P
Y=A
4Y
1 2/ (A
4Y
1 2+ A
5Y
1 4Ten A
6Y
1 6) obtain constant A wherein
1, A
2, A
3, A
4, A
5With nine can be at 0.5≤P
X(X=X
1)≤0.9 and 0.6≤P
Y(Y=Y
1Point (the X=X of the effective interface portion 4 of the inherent screen of the scope of)≤1.0
1, Y=0) with (X=0, Y=Y
1) choose.In constant A
1To A
6Satisfying under the situation of above-mentioned condition, even peripheral part equivalence radius of curvature obtains greatly, the characteristic of also can avoiding arching upward degenerates, and the surround lighting image of avoiding reflecting seriously distorts.
Fig. 3 is the cutaway view of the effective interface portion of screen of Fig. 1, wherein Fig. 3 (a) is along the cutaway view that almost is parallel to the effective interface portion 42 of the long side screen of long axis (X-X), and Fig. 3 (b) is along the cutaway view that almost is parallel to the effective interface portion 41 of minor face screen of minor axis (Y-Y).
Among Fig. 3, the effective interface portion 42 of the screen of the X-X that almost parallels to the axis has a curved surface that continues with minor face circumferential portion 31, and the effective interface portion 41 of the screen of the Y-Y that almost parallels to the axis has a curved surface that continues with long limit peripheral part 32.
Therefore, the curved surface and the effective interface portion 41 of screen that contains the Y.Y that almost parallels to the axis, their radius of curvature R that contain the effective interface portion 42 of screen of the X-X that almost parallels to the axis
1And R
2Almost equal, can make long limit (axis X-X limit) and minor face (axis Y-Y limit) flat like this, and remedy the distortion that is reflected to lip-deep image. can also reduce the phenomenon that arches upward of the shadow mask that is installed in the panel panel, and reduce landing error.
On the other hand, when each curved surface of panel was pressed above-mentioned value, panel produced so-called reflex action and plays (reverse-warping) phenomenon in the cross section of diagonal, and as shown in Figure 4, the second derivative sign modification of its outer surface curved surface once.But if shadow mask is made the shape that reflex action rises, then will change because of the sound equipment of television receiver, and produce the whistle phenomenon (howling phenomcnon) of so-called colored imbalance by the shadow mask that the porous metal sheet is made and intensity is little.Therefore in the present invention, the important point is, even the sign modification of panel outer surface second derivative, the symbol in the second derivative of the porous part of shadow mask also is constant at least.Here why scope be limited at least porous in part because non-porous peripheral part is to be made by the bigger metallic plate of intensity, and be subjected to the influence of whistle little.But the second derivative symbol on preferably yes the whole shadow mask is all constant.
Fig. 4 shows one embodiment of the present of invention, also is the cutaway view of cathode ray tube of the present invention in diagonal.Certainly, though for the intensity that improves shadow mask when its peripheral part forms rib, each curved surface of rib should not change yet.
Except the shape of panel negative camber, the characteristic of deflecting coil plays an important role at the vpg connection of determining aperture mask curved surface.Fig. 5 shows this point, and wherein symbol DP represents the deflection plane of deflecting coil.Optimum distance between shadow mask and the panel inner surface is determined that by the S value this S value is then main given by the distance between the red, green, blue electron beam of all kinds.Yet effectively the S value changes with the characteristic of deflecting coil.Therefore, can change each curved surface of shadow mask by the characteristic of selected deflecting coil.
Fig. 6 is the cutaway view of color cathode ray tube of shadow mask type structure of the present invention, wherein number 1 indication panel faceplate panels, 2 expression screen live parts, 3 expression peripheral parts, 5 presentation surface panel edges parts, 6 expression fluorescent surfaces, 7 expression shadow masks, 8 expression neck parts, 9 expression glass wimble fractions, 10 expression magnetic screens, 11 expression deflecting coils, 12 expression electron guns, 13 expression colour purity magnets, the magnet that the center electron beam static convergence is used is regulated in 14 expressions, and the magnet that side electron beam static convergence is used is regulated in 15 expressions, 16 expression electron beams.
As mentioned above, the outer surface and the inner surface of panel panel 1 are made curved surface, for preventing reflection and static electrification, form one or more layers and contain SnO on the outer surface of panel panel 1 in case of necessity
3, and InO
3Thin layer.In addition, the conductive film that deposit one deck is made up of graphite, titanium dioxide etc. on the inner surface of glass awl 9.
Here, magnetic screen 10 mainly plays the shielding earth magnetism.
According to above-mentioned, the invention provides so a kind of color cathode ray tube of shadow mask type, this ray tube function excellence, can make its panel panel flat, reduced mainly the lip-deep surround lighting image distortion of being reflected to that curved surface because of peripheral part causes, also reduce the phenomenon that arches upward of shadow mask, thereby shown high-quality image.
Claims (4)
1. color cathode ray tube of shadow mask type, comprise: screen live part (2) and round the peripheral part (3) of screen live part (2), and has the rectangle panel panel (1) that characterizes by long axis and minor axis, described panel panel (1) comprises described screen live part (2) and described peripheral part round screen live part (2) (3), it is characterized in that, when the curve form of at least one outer surface of described panel panel (1) during with the three dimensions The Representation Equation, the long axis of described rectangle panel panel (1) is represented by the X-axis line, the minor axis of described rectangle panel panel (1) is represented by the Y-axis line, the axis of this cathode ray tube is represented by z axis, long axis top-surface camber shape Z
XWith minor axis top-surface camber shape Z
YRoughly can be represented by the formula:
Z
X＝A
1X
2＋A
2X
4＋A
3X
6
Z
Y=A
4Y
2+ A
5Y
4+ A
6Y
6And when panel panel (1) is the curve form P of outer surface at a some place of the effective interface portion of screen at least
XAnd P
YWhen obtaining by following formula,
P
X=A
1X
2/ (A
1X
2+ A
2X
4+ A
3X
6) at point (X=X
1, Y=0) and
P
Y=A
4Y
2/ (A
4Y
2+ A
5Y
4+ A
6Y
6) at point (X=0, Y=Y
1) wherein the effective interface portion of this screen (4) be the interface between described screen live part (2) and the peripheral part (3), constant A
1, A
2, A
3, A
4, A
5And A
6Should satisfy following formula:
0.5≤P
X(X＝X
1)≤0.9
0.6≤P
Y(Y＝Y
1)≤1.0。
2. color cathode ray tube of shadow mask type according to claim 1, it is characterized in that, the arc curvature of this two curved surface of curved surface of the curved surface of the effective interface portion of minor face screen (41) and the effective interface portion of long side screen (42) almost is equal to each other on the outer surface of described panel panel (1), and when effective diagonal angle of described panel panel (1) catercorner length is V (millimeter), the radius of curvature R of described arc (millimeter), satisfy following relationship:
2.0(42.5V＋45.0)≤R≤4.0(42.5V＋45.0)。
3. color cathode ray tube of shadow mask type according to claim 2 is characterized in that, shadow mask is at the symbol of the second derivative of the surface equation of its diagonal cross section part, at its constant in live part at least.
4. color cathode ray tube of shadow mask type according to claim 2 is characterized in that, shadow mask is constant in its peripheral scope at the symbol of the second derivative of the surface equation of its diagonal cross section part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18977291 | 1991-07-30 | ||
| JP189772/91 | 1991-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1070768A CN1070768A (en) | 1993-04-07 |
| CN1047688C true CN1047688C (en) | 1999-12-22 |
Family
ID=16246938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92109014A Expired - Fee Related CN1047688C (en) | 1991-07-30 | 1992-07-30 | Color cathode ray tube of shadow mask type |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR950012697B1 (en) |
| CN (1) | CN1047688C (en) |
| FR (1) | FR2680045B1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR970011871B1 (en) * | 1994-09-16 | 1997-07-18 | Lg Electronics Inc | Projection tv for cathod-ray tube |
| KR970025199A (en) * | 1995-10-12 | 1997-05-30 | 김광호 | Backlight Chassis in Liquid Crystal Display |
| KR100521040B1 (en) * | 1999-01-25 | 2005-10-12 | 주식회사 효성 | Manufacturing of polyester composite fiber diyeable differently. |
| KR100331820B1 (en) * | 2000-04-12 | 2002-04-09 | 구자홍 | Flat Cathode Ray Tube |
| KR100364695B1 (en) * | 2000-05-04 | 2003-02-06 | 엘지전자 주식회사 | Anti-Explosion type Panel of Braun tube |
| KR200204497Y1 (en) * | 2000-06-24 | 2000-11-15 | 이원창 | one-touch type brake releasing system for train using an air pressure |
| KR102499138B1 (en) * | 2020-11-23 | 2023-02-13 | 주유정 | Copolyester Resin Dyable with a Cationic Dye for Nonwoven Fabrics |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2136200A (en) * | 1983-02-25 | 1984-09-12 | Rca Corp | Cathode-ray tube shadow mask contour |
| JPS63232247A (en) * | 1987-03-20 | 1988-09-28 | Hitachi Ltd | Shadow mask type color picture tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2634945B1 (en) * | 1988-07-27 | 1996-04-26 | Videocolor | METHOD FOR MANUFACTURING A HIGH DEFINITION COLOR TELEVISION TUBE AND HIGH DEFINITION TRICHROME TELEVISION TUBE |
| NL9000111A (en) * | 1990-01-17 | 1991-08-16 | Philips Nv | CATHODE JET TUBE WITH CURVED IMAGE WINDOW AND COLOR IMAGE DISPLAY. |
-
1992
- 1992-07-28 FR FR9209300A patent/FR2680045B1/en not_active Expired - Fee Related
- 1992-07-29 KR KR1019920013573A patent/KR950012697B1/en not_active IP Right Cessation
- 1992-07-30 CN CN92109014A patent/CN1047688C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2136200A (en) * | 1983-02-25 | 1984-09-12 | Rca Corp | Cathode-ray tube shadow mask contour |
| JPS63232247A (en) * | 1987-03-20 | 1988-09-28 | Hitachi Ltd | Shadow mask type color picture tube |
Also Published As
| Publication number | Publication date |
|---|---|
| KR930003220A (en) | 1993-02-24 |
| KR950012697B1 (en) | 1995-10-20 |
| CN1070768A (en) | 1993-04-07 |
| FR2680045A1 (en) | 1993-02-05 |
| FR2680045B1 (en) | 1994-04-01 |
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| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
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