EP1077468A1 - Tube cathodique en couleur à masque de tension - Google Patents

Tube cathodique en couleur à masque de tension Download PDF

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Publication number
EP1077468A1
EP1077468A1 EP99116060A EP99116060A EP1077468A1 EP 1077468 A1 EP1077468 A1 EP 1077468A1 EP 99116060 A EP99116060 A EP 99116060A EP 99116060 A EP99116060 A EP 99116060A EP 1077468 A1 EP1077468 A1 EP 1077468A1
Authority
EP
European Patent Office
Prior art keywords
mask
shadow mask
picture tube
color picture
shadow
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.)
Withdrawn
Application number
EP99116060A
Other languages
German (de)
English (en)
Inventor
Johann Mitrowitsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSI Esslingen GmbH
Original Assignee
Matsushita Electronics Europe GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electronics Europe GmbH filed Critical Matsushita Electronics Europe GmbH
Priority to EP99116060A priority Critical patent/EP1077468A1/fr
Priority to US09/630,359 priority patent/US6489713B1/en
Priority to JP2000236429A priority patent/JP3549816B2/ja
Priority to CZ20002948A priority patent/CZ20002948A3/cs
Publication of EP1077468A1 publication Critical patent/EP1077468A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a color television set or a color monitor and in particular a color picture tube with a tension mask, which is a bias in vertical and has horizontal direction.
  • Color television sets and (computer) monitors are used to convert electrical Signals in color images.
  • Color televisions and monitors now have one Interface for various video signal formats (such as composite signals, analog or digital component signals). These signals are in a television set or a monitor to control a color picture tube in analog RGB signals converted. In doing so, they are sent to a television set or a monitor Video signals are converted so that each individual pixel has a Certain brightness or color values can be assigned to the display screen can.
  • three Generates electron beams For the playback of an image contained in a video signal in a color picture tube contained in a color television or monitor, three Generates electron beams. Each of these electron beams corresponds to one of the three Basic colors of the additive color mix: red, green, blue.
  • the pixel information i.e. the brightness and color information, of the video signal a corresponding pixel on a fluorescent screen assigned to the color picture tube.
  • the fluorescent screen of a color picture tube contains approx.400,000 triple colors, i.e. fluorescent dots arranged in groups of three with one glowing red, one glowing green and one glowing blue Fluorescent dot.
  • the diameter of such a light spot is in about 0.3 mm.
  • each of these points becomes one of the three Electron beams controlled and made to glow.
  • the electron beams are from an electron gun in the neck of a color picture tube generated.
  • a color picture tube is shown in cross section in FIG.
  • a color picture tube consists of a glass body 15.
  • On the inside of the Front screen 16 of the color picture tube is a phosphor layer 17 with the phosphor dots arranged.
  • the electron beams to control the phosphor dots are generated by an electron gun 18 in the neck of the color picture tube.
  • Deflection unit which is attached to the outside of the color picture tube, become the electron beams so distracted that all the pixels of the luminescent screen are driven in succession become.
  • a shadow mask with a inside the color picture tube Mask frame 19.
  • These openings or holes have one Diameter of about 0.25 mm and are at regular intervals in the shadow mask / shadow mask etched. In each case through the common beam deflection controlled hole of the shadow mask meet the three electron beams and fall on the fluorescent spots of the fluorescent screen 17 lying behind a large part of the electrons generated by the electron gun are landing on the shadow mask.
  • Shadow masks are not only in the form of shadow masks, they are are also used in the form of stripe masks. With these stripe masks is the fluorescent screen 17 of a color picture tube not with individual phosphor dots, but with fluorescent strips running in the direction of the stripes of the shadow mask Mistake. Accordingly, the shadow mask has stripes Openings for the individual electron beams, each of which the stripe on the Luminous screen are assigned. Such a stripe mask often consists of parallel trending "wires".
  • the shadow mask is held by a mask frame 19, to give the mask mechanical stability and manageability.
  • mask frames are also made of thin sheet metal.
  • shadow masks are used nowadays also made of iron-nickel alloys with a very low coefficient of thermal expansion manufactured. Because such iron-nickel alloys are many times more expensive than iron, mask frames are made of iron. Problematic is the combination of shadow masks and mask frames that are made of materials with different coefficients of thermal expansion exist. When heating such mask-frame combinations are deformations of the shadow mask possible. This makes the position of the openings in the shadow mask relative changed to the location of the assigned phosphor dots or phosphor strips.
  • Shadow masks have found the greatest distribution.
  • Such a shadow mask is shown in Fig. 1.
  • the behind the fluorescent screen 1 Arranged shadow mask contains hole-like or strip-like openings 3, which the Match the arrangement of the fluorescent colors on the fluorescent screen.
  • the mask is attached to a frame 2.
  • the contour of such a mask can be vertical as well as being varied in the horizontal direction.
  • the holding frame must be used do not absorb large forces for the mask.
  • the material of the frame can therefore be selected essentially according to economic considerations.
  • Another type of color picture tube is biased in the vertical direction on.
  • Such shadow masks so-called tension masks, are essentially spread through the Trinitron tube.
  • These shadow masks are on their top and the lower edge firmly connected to the mask frame.
  • the preload of the Shadow mask is required to ensure that the distance between the Illuminated screen and the shadow mask in the direction of the longitudinal axis 21 of the color picture tube remains constant.
  • the vertical alignment is achieved by the preload "Wires" put under tension. This gives the stripe mask its mechanical Stability. High tensile forces are required for the preload, the values of several can accept kN.
  • the mask frame is therefore very solid. When choosing the material, the high process temperatures are particularly important To consider the manufacturing process of a color picture tube.
  • Such a tension mask with tension in the vertical direction is shown in Fig. 2. Also this mask has a fluorescent screen 1 and a mask frame 2.
  • the wires 5 the mask are biased in the vertical direction. This bias is through the arrows 7, 8 indicated in Fig. 2.
  • damping wires 6 placed. Have this the task of suppressing mechanical vibrations of the mask wires 5 and keep the distances between the wires constant.
  • damping wires 6 have the disadvantage that they are displayed on the screen of the color picture tube and to be recognized there as permanent horizontal dark lines in the picture are.
  • the mechanical Stability can also be improved by having small webs between the wires to be ordered. These webs prevent that every single mask wire for can swing. Through a uniform arrangement of such webs Gaps between the wires are kept constant and appear on the screen a homogeneous, non-distracting structure, like that of shaped shadow masks is known.
  • the shadow mask in the simplest case also attached to the side of the mask frame.
  • bias can also be done without connecting the shadow mask with the side elements of the mask frame.
  • the Shadow mask in the horizontal direction through a narrow, non-perforated surface extended.
  • By stretching the shadow mask in the vertical direction it becomes non-perforated sections extended in the direction of stretch.
  • there is a constriction in the middle of these sections i.e. these sections will due to the narrowing, the strongest in the middle. This will make the punched Inner surface of the shadow mask that is not punched between the two Edge sections lies, pulled outwards. So it is simultaneously with the vertical Bias creates an additional horizontal bias.
  • This method is commonly referred to as the semi-stretch tension technique, or SST technique for short.
  • the principle of this technique is explained with reference to FIG. 5. Only a part of it of the entire shadow mask, and that is only one half in FIG. 5 the shadow mask with one of the non-perforated, additional side surfaces shown.
  • the shadow mask 25 has a perforated section 26 and additional Sections 27 in which no holes are provided.
  • the mask will be attached to the mask frame stretched in the vertical direction. This will attach the shadow mask a permanent prestress in the mask frame on the shadow mask 25 exercised in the vertical direction. This pretension prevents the curvature of the Mask due to the longitudinal axis of the color picture tube during operation thermal expansion in the vertical direction.
  • 5 shows how the shape of the edge portion 27 of the shadow mask, which has no openings has changed in this aspect ratio.
  • the shape of the shadow mask in front of the Stretching is shown by the solid lines, the shape after stretching is represented by the broken line 30.
  • necking C The one that occurs maximum decrease in width of the edge section 27.
  • stretching the mask in the vertical direction also has an effect a horizontal tensile force that is directed outward.
  • the height this tensile force depends on the strength of the constriction C.
  • the wider the section 27 before vertical stretching the greater the constriction created C and thus the horizontal traction.
  • the width of the additional, Non-perforated sections 27 can, however, only be increased to a very limited extent without that the screen area in the horizontal direction by disturbing, not as a display area usable areas must be widened. Are accordingly the horizontal tensile forces that can be generated are very low.
  • the object of the invention is known color television sets and color monitors and in particular to develop color picture tubes such that the shadow masks of the Color picture tubes can also be made from a cheaper mask material can.
  • an expensive mask material that has a low thermal Has expansion coefficients
  • a cheaper mask material such as. Replace iron if the tensile forces are significantly higher in the horizontal direction than can be generated so far. Because then even the much larger ones can thermal expansion of the cheaper materials in operation compensated become.
  • the sides of the shadow mask that are not with the mask frame are connected, arcuate, the arcuate outer Edge has a higher strength than the shadow mask inner surface.
  • the arc shape of the side edges must point inwards. Through vertical Stretching the mask also stretches the arc shape, i.e. their curvature diminishes yourself.
  • the shadow mask has an arcuate shape to reinforce it Sides on these have a larger material cross section than in the inner surface of the mask. In this way, the firmness of the mask can be increased simple way to increase.
  • the mask When making a shadow mask, the mask is used to create the openings usually subjected to an etching process. During this etching process the material cross section of the entire mask is reduced. An increased material cross section on the arcuate edge areas to be reinforced can be particularly produce simply by largely removing these edge areas from the etching process to be left out. As a result, these sections point after the etching process a larger material cross section than the perforated mask area.
  • the higher strength or the larger material cross section can also be produced by this be that an additional element in the edge areas to be reinforced is provided.
  • the advantage of this procedure is that the masks initially can be produced in the usual way and finally with additional, separately manufactured elements can be combined.
  • the invention can be based on this Easily in the usual manufacturing process of a color picture tube to get integrated. If this additional element is made of a material with increased Strength can be produced, the material cross section of this additional element turn out to be particularly low.
  • the shadow mask consists of a perforated section 26 and a non-perforated section 27.
  • Section 27 consists of two differently designed parts A and B.
  • Part A corresponds in its Strength, especially in its material cross-section, that of the perforated / slotted Section 26 of the shadow mask.
  • Part B is in his Strength increased, for example due to an increased material cross section.
  • the A part marked with A can by so-called etching in cross section be reduced so far that it strengthens the perforated / slotted Mask part 26 corresponds.
  • the part marked with B is designed so that it has a significantly higher mechanical strength. In section B it can either be a so-called "full material” without etching or additional material, for example by attaching another Element.
  • the solid lines in FIG. 6 represent, as in FIG. 5, the state of the shadow mask 25 before stretching in the vertical direction.
  • the width of the part A of the arcuate edge is designated by x 1 in the middle between the upper and lower edge of the shadow mask , the width of part B with x 2 .
  • the inward-facing radii of parts A and B of section 27 are denoted by R 1 for the outer edge of part B, R M for the center radius between parts A and B and R 2 for the boundary line between part A and the perforated section 26 of the shadow mask 25.
  • FIG. 6 The state of the edge region 27 of the shadow mask 25 designed according to the invention after the stretching in the vertical direction is shown in FIG. 6 with the broken line.
  • the arch shape of the reinforced part B is straightened by the stretching. This means that the edge lines of part B have only a slight curvature compared to the radii R 1 and R M , which can even approach a straight line. However, an exact straight shape cannot be achieved by the stretching, so that the reinforced edges B always have a "residual curvature" in the direction of the arc shape before the stretching.
  • Constriction C By stretching the arch shape of the reinforced edges B in turn Constriction C creates. Unlike in FIG. 5, the section is constricted 27 this time, however, not on both sides of section 27, but only on the side of section 27, which is on the perforated surface 26 of the shadow mask borders. With the shadow mask designed according to the invention, therefore, only takes place a one-sided constriction takes place, so that the total width reduction of the section 27 benefits the generation of horizontal traction. The stronger one Constriction can result in a greater horizontal bias of the shadow mask cause.
  • the maximum preload that can be generated depends in particular on the radii of the reinforced one B marginal areas. The greater the difference between the radii before and after the vertical stretching of the shadow mask, the larger that can be generated horizontal preload.
  • An exemplary embodiment of a color picture tube designed according to the invention which can be installed in color television sets and color monitors according to the invention, has approximately the following dimensions: Height of the shadow mask about 414 mm, Shadow mask material Iron, Aspect ratio in about 4: 3, Shadow mask thickness about 0.1 mm (with the exception of the reinforced edge areas), x 1 + x 2 about 5 mm, R 1 about 3.35 m, R M approximately 12.0 m.
  • a significantly higher constriction can be inventively C than achieve with previously known methods, so that a stronger horizontal thermal expansion can be compensated for as conventional.
  • shadow masks that are only on two opposite Sides are attached to the mask frame, use other mask materials, especially those that have a higher coefficient of thermal expansion.
  • Invar can be used as a manufacturing material replace with iron.
  • iron has a higher coefficient of thermal expansion, but the higher horizontal bias according to the invention can Compensate for greater thermal expansion of iron so that no curvature the shadow mask occurs in the longitudinal direction of the color picture tube.
  • the achievable constriction C is not only from Radius of the reinforced outer lateral edges of the shadow mask, but also the degree of their reinforcement.
  • the gain can be increased of the material cross section.
  • the degree of reinforcement results then from the thickness ratio of the reinforced edge to the non-reinforced part the shadow mask.
  • the horizontal tensile force that can be achieved by stretching Shape change of the arch shape of the reinforced outer edge B is based, depends on how much the extension of the arc shape of the outer Claim margins against the opposing forces of the inner surface of the mask can.
  • the inner surface of the mask also tries to stretch in the vertical direction compensate by contraction in the horizontal direction. As a result of that the strength of the outer edge or both opposite outer edges is increased so that this essentially the shape of the inner surface of the mask Forcing on vertical stretching will increase the horizontal acting tensile force achieved.
  • Fig. 7 it is indicated how with the given parameters for the shadow mask the deflection by varying the thickness ratio of parts A and B. i.e. the constriction C can vary (in mm).
  • the achievable deflection and thus increases the achievable horizontal traction increases significantly.
  • a shadow mask with the parameters given above with a thickness ratio of A to B of about 0.7 achieve 0.2 mm deflection.
  • a thickness ratio from A to B of 0.2 the deflection that can be achieved can be doubled to about 0.4 mm.
  • the invention is basically directed to a second bias, which is indirect is generated via a first bias.
  • the second Bias generated in a direction that is substantially perpendicular to the direction the first bias. Due to an inward arch shape of the lateral mask edges and their reinforcement, the achievable second bias increase significantly.

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  • Electrodes For Cathode-Ray Tubes (AREA)
EP99116060A 1999-08-16 1999-08-16 Tube cathodique en couleur à masque de tension Withdrawn EP1077468A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP99116060A EP1077468A1 (fr) 1999-08-16 1999-08-16 Tube cathodique en couleur à masque de tension
US09/630,359 US6489713B1 (en) 1999-08-16 2000-08-01 Color picture tube with a tension mask
JP2000236429A JP3549816B2 (ja) 1999-08-16 2000-08-04 引張マスク付カラー受像管
CZ20002948A CZ20002948A3 (cs) 1999-08-16 2000-08-10 Barevná obrazovka s předepnutou maskou

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99116060A EP1077468A1 (fr) 1999-08-16 1999-08-16 Tube cathodique en couleur à masque de tension

Publications (1)

Publication Number Publication Date
EP1077468A1 true EP1077468A1 (fr) 2001-02-21

Family

ID=8238783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116060A Withdrawn EP1077468A1 (fr) 1999-08-16 1999-08-16 Tube cathodique en couleur à masque de tension

Country Status (4)

Country Link
US (1) US6489713B1 (fr)
EP (1) EP1077468A1 (fr)
JP (1) JP3549816B2 (fr)
CZ (1) CZ20002948A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6489713B1 (en) * 1999-08-16 2002-12-03 Matsushita Display Devices (Germany), Gmbh Color picture tube with a tension mask

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6166782A (en) * 1997-01-29 2000-12-26 Apple Computer, Inc. Method and apparatus for reducing visibility of damping wires in aperture grill display tubes
WO2006073392A1 (fr) * 2005-01-04 2006-07-13 Thomson Licensing S. A. Tube cathodique ayant un masque de tension et assemblage de cadre de support avec des materiaux d’expansion thermique dissimilaires
US7582413B2 (en) * 2005-09-26 2009-09-01 Asml Netherlands B.V. Substrate, method of exposing a substrate, machine readable medium

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809945A (en) * 1973-03-02 1974-05-07 Zenith Radio Corp Shadow mask for color cathode ray tube and method of manufacture thereof
JPS5699949A (en) * 1980-01-09 1981-08-11 Mitsubishi Electric Corp Shadow mask
EP0372630A2 (fr) * 1988-12-05 1990-06-13 Koninklijke Philips Electronics N.V. Masque d'ombre comportant une disposition de trous sur sa périphérie
US4942332A (en) * 1988-12-02 1990-07-17 Zenith Electronics Corporation Tied slit mask for color cathode ray tubes
US5610473A (en) * 1994-09-09 1997-03-11 Kabushiki Kaisha Toshiba Color cathode-ray tube
US5929558A (en) * 1996-12-30 1999-07-27 Samsung Display Devices Co., Ltd. Shadow mask assembly with thermal expansion compensation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808945A (en) 1971-03-29 1974-05-07 Konishiroku Photo Ind Light-sensitive silver halide color photographic emulsion
US5554909A (en) * 1994-05-06 1996-09-10 Philips Electronics North America Corporation One dimensional tension mask-frame assembly for CRT
JP3390142B2 (ja) * 1998-08-26 2003-03-24 松下電器産業株式会社 カラー陰極線管の製造方法及びその製造装置
EP1077468A1 (fr) * 1999-08-16 2001-02-21 Matsushita Electronics (Europe) GmbH Tube cathodique en couleur à masque de tension
JP2001126631A (ja) * 1999-10-28 2001-05-11 Nec Kansai Ltd シャドウマスク構体およびカラーブラウン管

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809945A (en) * 1973-03-02 1974-05-07 Zenith Radio Corp Shadow mask for color cathode ray tube and method of manufacture thereof
JPS5699949A (en) * 1980-01-09 1981-08-11 Mitsubishi Electric Corp Shadow mask
US4942332A (en) * 1988-12-02 1990-07-17 Zenith Electronics Corporation Tied slit mask for color cathode ray tubes
EP0372630A2 (fr) * 1988-12-05 1990-06-13 Koninklijke Philips Electronics N.V. Masque d'ombre comportant une disposition de trous sur sa périphérie
US5610473A (en) * 1994-09-09 1997-03-11 Kabushiki Kaisha Toshiba Color cathode-ray tube
US5929558A (en) * 1996-12-30 1999-07-27 Samsung Display Devices Co., Ltd. Shadow mask assembly with thermal expansion compensation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 171 (E - 080) 30 October 1981 (1981-10-30) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6489713B1 (en) * 1999-08-16 2002-12-03 Matsushita Display Devices (Germany), Gmbh Color picture tube with a tension mask

Also Published As

Publication number Publication date
US6489713B1 (en) 2002-12-03
JP3549816B2 (ja) 2004-08-04
CZ20002948A3 (cs) 2002-04-17
JP2001076642A (ja) 2001-03-23

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