CN1014477B - Colour display tube - Google Patents

Abstract

The present invention relates to a color display tube which comprises a display window, wherein the window is formed by a steep curve part and is basically parallel to the periphery of a tube shaft, the inner surface of the window forms the inner surface of the periphery by a steep curve surface of which the curve radius is r, and the outer surface of the window forms the outer surface of the periphery by a steep curve surface. The inner side of the window comprises a basically rectangular display screen and a shield shadow mask arranged on the short distance in the front of the screen, and the shield shadow mask is supported in the four corners of the display window by using a hanging piece arranged in the periphery. In the proximity of the steep curve position, the thickness of the periphery is d, and in a surface which is perpendicular to the tube shaft, a distance D between the boundary of the illuminant of the display screen and the outer surface of the periphery is basically equal along the periphery of the display window; when r is smaller than 10 millimeters, (D-d)/r is smaller than or equal to 1.

Description

Colour display tube

The present invention relates to colour display tube, known display tube comprises a shell, this shell by neck, cone peace or protruding slightly display window form.Display window becomes the periphery that parallels with the axis of shell basically by a sharply crooked part, the inner surface of this display window is the inner surface that first rapid flexure plane of r becomes above-mentioned periphery by radius of curvature, and the outer surface of this display window becomes the outer surface of above-mentioned periphery by second rapid flexure plane, and near the thickness of this periphery above-mentioned conversion place is d.Display window within it side also to comprise one be the display screen of rectangle basically, this display screen comprises the material that sends a kind of colourama at least.Above-mentioned display tube also comprises by means of being installed in the device in described neck that suspension arrangement on the periphery is positioned the colour selecting device of above-mentioned display screen front and produces a kind of electron beam at least.

The latest developments of display tube more and more tend to more flat display window, and for example " electronic engineering magazine " (Journal of Electronic Engineering) 1982,8 is P.24 described.In the document, relate to a kind of colour display tube that is essentially rectangular display screen that has, yet the outline of the display window of this pipe becomes cylindrical shape slightly.

In colour display tube, usually the suspension arrangement of colour selecting device is installed on the long limit and minor face of display window periphery.Suspension arrangement is made up of the peg that is welded on the periphery usually, and every peg is all stretched in the hole of the metal spring band that is connected to colour selecting device.Described metal tape is received on the periphery of colour selecting device, and this colour selecting device also is arranged essentially parallel to the axis extension of shell.Obviously, for a kind of like this suspended structure, need between the periphery of display window periphery and colour selecting device, reserve a sizable gap.For this reason, the in-profile of display window periphery will make more cylindrical a little than the profile of the periphery of colour selecting device.For be placed in the casing and with flat filler rod will its outside around covering get up in order to avoid the pipe that the observer sees, this need are if it were not for a kind of defective, because the inward flange of flat filler rod can be pressed close to the edge of display screen.But, its display window is protruded outside casing the pipe that therefore (so-called break-through assembling push-through mounting) so that flat filler rod can not adopt slightly, in the dark space that causes the displayed image upper and lower, left and right hardly for the display screen that is essentially rectangle on the inwall of rectangle display window, the width of this dark space can change and make the observer disagreeable.Owing to the peripheral outline of the outline of display window and the display window itself that therefore causes more becomes this fact of cylindrical shape than its interior profile, make and thisly do not wish that the effect that obtains strengthens more.Suppose that to adopt this design to say so for the strict demand that prevents the pipe implosion essential.

The purpose of this invention is to provide a kind of display tube that above-mentioned disagreeable dark space was installed and do not occurred in break-through that is particularly suitable for.

According to the present invention, a colour display tube is provided here, this pipe comprises one by shell neck, cone peace or that protruding slightly display window is formed.Display window becomes parallel with tube axis basically periphery by a rapid sweep, and the inner face of display window also contains a display screen that is essentially rectangle, and screen contains a kind of material that sends a kind of colourama at least.Display tube also comprises colour selecting device and can produce the device of at least one electron beam in above-mentioned neck, and wherein colour selecting device is positioned the front of above-mentioned display screen by means of the suspension arrangement that is installed in peripheral corner.In pipe, it is the inner surface that the rapid flexure plane of r becomes above-mentioned periphery that the inner surface of display window has radius of curvature by first, and the outer surface of display window becomes the outer surface of above-mentioned periphery by second rapid flexure plane, periphery is d near the above-mentioned thickness that curves conversion place, distance D in the plane of the vertical tubular axis between the outer surface of the periphery of the border of display screen luminescent substance and display window is identical around display window basically, wherein, situation for r≤10 millimeter, following conditions satisfies, i.e. (D-d)/(r)≤1

Have only a narrow dark side around rectangular display screen in the display tube of making by the present invention, the width almost everywhere of this dark side is identical.The present invention has still shown the rectangle characteristic of display screen highlightedly.And when display tube was worked, the above-mentioned fillet dark side that the width almost everywhere is identical can make image show the attraction observer.It should be noted that the perceptible distortion of the unlikely observer of causing of above-mentioned dark side.For example, can not cause the appreciable distortion that is presented at the many straight position on the display screen.When pipe is not worked, there is the fillet dark side of same widths to form a kind of design of U.S. on every side everywhere basically at display screen.In addition, experiment is calculated with contrast and confirmed: the display tube with the display window that is essentially the rectangle outline is compared with having the known tubes that is essentially flat display window and cylindrical shape, does not all lose the fail safe of implosion under static and dynamic load two states.

This invention has advantageously utilized the big gap that has on four angles of display screen between the periphery of the periphery of display window and colour selecting device.Basically also be rectangular profile because the in-profile of display window almost is the periphery of rectangle and colour selecting device, benefiting with respect to the space of each center, limit of above-mentioned rectangle is at least $\sqrt{2}$ Doubly.The display tube that employing is made by the present invention, benefiting and can be used effectively in the space, compares with known display tube, and the border of display screen luminescent substance can be extended along the in-profile of display window.In such a way, can on display window, obtain the optimum size of display screen.For the pipe that the black matrix material is arranged between the unit of display screen luminescent substance, this is significant, and said base matter may extend into outside the border of display screen luminescent substance.Yet no base matter had layer of aluminum film (metal-backed) and aluminium film is reached the pipe outside the border of luminescent substance on luminescent substance, this also is important.In fact, in the previous case.As not adopting the present invention, will form a wide dark space heterogeneous, and when one situation of back, form the luminous non-homogeneous limit (aluminium) that dark side surrounded by the periphery generation of display window.

Having flat substantially display window, that is, having in the display tube of display window of larger radius of curvature, is important and necessary at the display window corner colour selecting device that suspends.In fact, the colour selecting device under more flat display window situation, for example, the colour selecting device that the short distance before display screen is placed with the form of planar mask must design more flatly.In the pipe work process, the local or whole expansion of the temperature difference that may exist on shadow mask and the shadow mask that therefore causes will cause the major defect of the colour of shown image in more flat shadow mask.With regard to the mechanical strength that shadow mask hangs from each center, limit, the periphery of shadow mask must be connected on the supporting construction that the sheet material thicker than cover itself makes.Said supporting construction also constitutes to prevent the dividing plate of electronics in the place's reflection of shadow mask periphery.This point itself can cause the temperature difference between shadow mask periphery and the shadow mask itself quickly, yet, owing to adopted the present invention, can make aforementioned barriers thickness be adapted to the thickness of shadow mask itself, this is because the mechanical strength of shadow mask around the corner is to be enough to big arriving can hang those local realizations around the corner.

According to this reason of just being understood by people originally, it is noticeable hanging colour selecting device in the corner of display window.

The suspend attendant advantages of colour selecting device of display window corner is can be by plain mode body plan suspended structure.People have recognized that the compensation as the thermal expansion of shadow mask is to realize by means of the displacement of shadow mask in the display screen direction.For this purpose, traditional method is to utilize bimetallic element that shadow mask is suspended to be welded on the nail of display window periphery.In the suspending apparatus around the corner, said bimetallic element can replace with simple bonding jumper.In every corner, these bonding jumpers vertically be substantially perpendicular to electron beam to the deflection of described turning.

By way of example, with reference to the accompanying drawings, will explain and describe the present invention in more detail now, in the accompanying drawing:

Fig. 1 is the perspective view of prior art television set, and this television set has flat filler rod around display screen.

Fig. 2 is the not flat filler rod of of prior art and have break-through that the television set of display tube is installed.

Fig. 3 is the front view of the display tube of television set shown in Fig. 2.

Fig. 4 is the front view of display tube manufactured according to the present invention.

Fig. 5 is the periphery of display window of display tube shown in Fig. 4 and the sectional view of marginal portion.

Fig. 6 is the rearview of the display window of prior art, and shadow mask is suspended at and is welded to nailing on of each center, limit among the figure.

Fig. 7 is the rearview of the display window made by the present invention, among the figure at the corner of the display window shadow mask that suspends.

Fig. 8 is the perspective view of the mounting structure of display window corner.

Fig. 1 is the perspective view of prior art television set.The display tube that not shown handle has a display window 1 is connected to the suspending apparatus in the casing 2.Described pipe contains a display screen that is essentially rectangle on the inwall of display window 1 that is rectangle hardly, the outline 3 of display window is cylindrical a little.The result who causes thus be formed on around the display screen 6 dark side 7,7 that Width changes ', and this dark side is covered in by flat filler rod 4.The inner edge 4 of the flat filler rod 4 ' observer the has been formed visible borders of the luminescent material of the display screen 6 on the inwall of display window 1.

Fig. 2 is the perspective view of television set, has adopted the display tube as the sort of television set used among Fig. 1 among the figure.In this television set, display window 1 protrudes from casing 2 slightly, and this break-through that is called display tube is installed.By the mode that this pipe is installed, the flat filler rod 4 described in Fig. 1 is impossible adopt.Basic display screen 6 for rectangle with dotted line 5 be the boundary be on the inwall of display window 1 of rectangle hardly, this display screen 6 caused the dark space of upper and lower, left and right of displayed image or clear zone 7,7 ', the change width that these are regional makes the observer feel disagreeable.Zone 7 and 7 for basal body pipe ' be dark, and for the pipe that does not adopt basis material, because the aluminium that exists outside the border of luminescent substance can be seen the observer, zone 7 and 7 ' partly shinny (zone 7 ').Clearly illustrated that this point in Fig. 3, Fig. 3 shows the front view of the sort of display tube that television set adopted among Fig. 2.Diagonal is in 51 centimetres the pipe outside display window, on diagonal from display screen 6(figure dotted line) border 5 are 18.3 millimeters (a represents with arrow) to the distance of display window outline 3, and be 26.6 millimeters (b represents with arrow) and 23.8 millimeters (c represents with arrow) respectively in its distance of the center of long limit and minor face.

Fig. 4 is the front view by the display tube of manufacturing of the present invention, the outline 8 of display window 9 is parallel with the border 10 of the luminescent substance of display screen 11 basically among the figure, owing to around the display screen 11 that is essentially rectangle, obtained like this, at the uniform dark side 11 of Width.

By a that the sort of mode shown in Figure 3 defines, b, the c value is respectively 19.5 millimeters, 20.9 millimeters and 20.0 millimeters.In the pipe of making by the present invention, the change width of dark side observes not come out less than 1.5 millimeters basically.In known tubes, described variation surpasses 8 millimeters, and this variation produces a kind of very tedious effect.The radius of curvature on each limit of outline 8 is approximately 6.5 meters.

Fig. 5 is the edge and periphery 63 the partial cross section figure of the display window 9 of display tube shown in Figure 4.The inner surface 64 of display window 9 is the inner surface 66 that the rapid flexure plane 65 of r becomes periphery 63 by radius of curvature.Sharply the radius of curvature r of curved surface 65 is between 3 millimeters and 10 millimeters, and is approximately 8 millimeters here.Distance between the border 10 of the luminescent material of display screen 11 and periphery 63 the outer surface is represented with D, here is 20.0 millimeters, and the thickness of the periphery of representing with d 63 is approximately 14.5 millimeters.As rule, the part that cooks noodle when r≤10 millimeter is satisfied, i.e. (D-d)/(r)≤1.Common thin aluminium film is evaporated on the luminescent material that is deposited on display screen 11, does not show among the figure.Because the sharply extension of the luminescent material of the small curvature radius of curved surface 65 and display screen 11, what see previously at pipe only is the very narrow aluminium film edge of bar.With regard to basal body pipe,, make the observer cannot see aluminium film portion above border 10 because the black matrix material has been arranged.Can see from Fig. 4, under the sort of situation, dark side 12 has only broadened some on very little degree.

Fig. 6 is the rearview of prior art display window, and the form that colour selecting device is got shadow mask 13 among the figure is suspended on the peg 14 that is welded in display window 1 each limit center position.Shadow mask 13 comprises periphery 15, and resilient bimetal strip 16 is soldered on this periphery, and each root bimetal strip has an aperture 18 at its free end 17 places, and peg 14 stretches out by this hole.Because the existence in above-mentioned suspended structure desired gap between the periphery of the periphery 15 of shadow mask 13 and display window 1, make that the rectangular edges 5 of luminescent material of display screen 6 can not be near the interior profile 20 of display window 1, thus formed change width and be shown in dark space among Fig. 3 or clear zone 7 '.Suspension arrangement is placed on display window corner, just can be implemented in the optimum size of the display screen on the display window.This structure is shown in Figure 7, and Fig. 7 is the rearview of display window shown in Figure 4.

Fig. 8 is the perspective view of a suspended structure, and the suspended structure shown in Fig. 7 can realize that this suspension arrangement is disclosed by this figure in Netherlands patent applications 8302182.Peg 50 is welded on each corner of the periphery 23 of display window 9.The circular shaft 51 that has a conical cam 52 is positioned at the free end of nail 50.Colour selecting device is made of a thin shadow mask 40, and this shadow mask has many holes 42 and comprises a periphery 41.The partition that is shown in broken lines 39 joins with periphery 41 in case in the reflection of peripheral 41 place's electronics.For fear of the difference that expands between cover 40 and the partition 39, both are with almost having (150 microns) commaterial of same thickness to make.The support chip that has two lugs 37 is received the corner of partition 39.A flat thin flexible member 25 is received on the lug 37 by two narrow lugs 21.Plane component 25 comprises crimping 26, and this crimping makes element 25 be enhanced at longitudinal direction.In addition, the plane component perpendicular is to the electron beam of above-mentioned turning deflection.Although shadow mask 40 thermal expansions, yet have only lug 21 bendings.The remaining part of element 25 is still flat, so that element 25 rotates around the end of receiving lug 37 basically.A slotted hole 27 is arranged on plane elasticity element 25, and this hole is positioned near the end away from support bar 24.The plate 28 that hole 27 is partly had hole 29 hides, and plate 28 is received on the element 25.The effect of plate 28 will be discussed in more detail below.Also have two holes 30 and 31 in plane elasticity element 25 except slotted hole 27, the crotch end 32 and 33 of the wire spring 34 shown in the part passes this hole 30 and 31 among the figure.An other end 35 of wire spring 34 is clamped on the crooked butt strip 36, and crooked butt strip 36 is connected with support bar 24.Connect wire spring 34 in this manner, so that be tightened up between support bar 24 and end away from the plane elasticity element 25 of support bar 24.In addition, wire spring 34 can break away from plane elasticity element 25 fully.Support bar 24 also comprises an invisible in the drawings pillar, and this pillar has limited the rotation that plane elasticity element 25 is pressed the direction of arrow 60.

Shadow mask 40 is suspended above in the display window, and the method that suspends is that the flat board 28 of flexible member 25 and band perforate 29 is placed on the conical cam 52 of nail 50.In such a way, utilize plane elasticity element 25, shadow mask 40 is completely fixed with respect to the position of display window 9.Nail 50 is substantially perpendicular to plane, flexible member 25 place, utilizes the wire spring of tension that this flexible member 25 is advanced on nail 50.Wire spring 34 guarantees that after vibration occurs flexible member 25 always gets back to the same position on the cam 52 of nail 50.Hole 30 and 31 and the center in hole 27 on same line, the crotch end of wire spring 34 just hangs in hole 30 and 31.Thus, the junction point of the tension force of wire spring 34 is consistent with the axis of cam 52, so that wire spring 34 can not apply moment to plane elasticity element 25, and consequently, the position of element 25 can change with respect to cam 52.Plane elasticity element 25 is to receive on the shadow mask 40 with a kind of like this angle, makes it basically with vertical to the electron beam of the turning of display window 9 deflection.When shadow mask 40 expanded, in order to keep colored pure image, it was essential between shadow mask 40 and the display window 9 a smaller distance being arranged.Because it is in order to rotate substantially that plane elasticity element 25 is received on the shadow mask 40, so shadow mask will move on the direction of display screen when expanding.Plate 28 conducts are to following closely the compensation of error that 50 positions may exist.Every block of plate 28 comprises two recesses 38, and the crotch end 32 and 33 of wire spring 34 passes recess and stretches out.The crotch end 32 of wire spring 34 and 33 and plate 28 for axle journal relation so that can be on the correct height position by the slotted hole 27 of retaining hole 29 on plane elasticity element 25, and dull and stereotyped 28 can move with respect to plane elasticity element 25.After being placed on the plate 28 that has hole 29 on the cam 52, cam has just linked up with flexible member 25.Because like this, the position in hole 29 accurately cooperates with the position of 52 taper seat.When adopting the flat board 28 of non-loosening, shadow mask 40 may differ owing to the position in cam 52 and the hole in plane elasticity element 25 27 and produce distortion.The dividing plate 39 that has a flexible member 25 in display window, hang in a manner described good after, utilize the skewer of space frame to go into thing cover 40 be placed in the display window 9, afterwards, dividing plate 39 is soldered on the periphery 41 of cover 40.

In a manner described, after display window 9 has been provided the shadow mask that matches, display screen 11 is provided for this display window with usual way.Because it is littler than the distance in the at present known pipe to have adopted the display tube of making by the present invention, the gap between the periphery 23 of display tube 9 and the periphery 41 of shadow mask 40 to choose.Because like this, can make the interior profile 43 of display window be essentially rectangle, also can make the square boundary 10 of the luminescent material of display screen stretch last substantially parallelly apart from the very short distance of interior profile 43.Interior profile is formed by the intersection point line, profile place in this, and the inner surface 45 of window 9 curves the rapid flexure plane 44 of radius of curvature between 3 millimeters and 10 millimeters.The border 10 of the luminescent material of display screen 11 is consistent or consistent basically with above-mentioned interior profile.

Obviously, the present invention is not restricted to the concrete device of the suspended structure of the shadow mask described in the Netherlands patent applications 8102182.Other suspension arrangement as at the suspension arrangement described in Netherlands patent applications 8004173,8003611 and 8003609, also can adopt.

Further data can be with reference to Netherlands patent applications 8303178,8304180 and 8304181.

Claims (1)

1, one colour display tube, it comprises one by neck, a cone and a shell flat or that crooked slightly display window is formed, display window becomes the periphery that parallels with the axis of shell in fact by a rapid sweep, display window side within it contains a display screen that is essentially rectangle, and display screen contains the material that sends a kind of colourama at least, display tube also comprise colour selecting device and be contained in neck in order to produce the device of at least one electron beam, this colour selecting device is positioned before the above-mentioned display screen by means of the suspension arrangement that is installed in peripheral corner, in pipe, the inner surface of display window is the inner surface that the rapid flexure plane of r becomes described periphery by first radius of curvature, and the outer surface of display window becomes the outer surface of described periphery by second rapid flexure plane, near described conversion place periphery, its thickness is d, the invention is characterized in and around window, coming down to identical perpendicular to the distance D in the plane of tubular axis between the outer surface of the border of display screen luminescent substance and display window periphery, and be that following conditions satisfies, i.e. [(D-d)/r]≤1, wherein r≤10 millimeter.

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