CN85104466B - Color picture tube having shadow mask frame with truncated corners - Google Patents

Abstract

The present invention relates to an improvement of a color picture tube. The color picture tube comprises an evacuated casing and a rectangular screen assembly for a long axis and a short axis in the casing, wherein the longitudinal axis Z-Z of the center of the picture tube is vertical to the long axis and the short axis through the center of the screen assembly. The screen assembly comprises a shadow mask which is arranged at a plurality of points including points on corners, wherein the points on corners are welded to a frame on the periphery thereof. The improvement of the picture tube comprises a frame with chamfering corners, wherein a first flange of each frame corner is straight and flat and presents an acute angle corresponding to a long axis and a short axis. The periphery of the shadow mask is consistent to the shape of the first flange and can stretch in the first flange. The shadow mask is welded and connected to the corners of the frame and is approximately arranged in the center of the straight and the flat parts of each chamfering corner.

Description

Adopt the color picture tube of rescinded angle shadow mask frame

The present invention relates to a kind of color picture tube of pattern, the color picture tube of this pattern has a planar mask, this planar mask links to each other with the peripheral frame that suspends, so that be associated with the cathodoluminescence phosphor screen, specifically, the present invention relates to a kind of novel shadow mask one frame assembled form, it helps to reduce the bulbous protrusions of planar mask in the pipe work process.

In these color picture tubes, beat the accuracy that accuracy in the cathode electronics photoluminescence phosphor screen zone of each unit depends on that to a great extent the phosphor screen zone in hole, planar mask hurdle and unit aligns in the picture tube course of work by electron gun electrons emitted bundle.In the incipient stage of picture tube work, planar mask is faster compared with heavier peripheral frame because of the heated speed of the bump that is subjected to electron beam.Because the difference of this heating, the speed of expansion of planar mask is faster than framework.Because the periphery of planar mask is to be welded on the framework, the expansion more rapidly of this planar mask can cause that framework stops the expansion of planar mask, thereby cause the planar mask globulate to be swelled, this planar mask globulate protuberance can cause the phosphor screen zone that can not aim at the unit that they are associated by its electron beam, thereby causes occurring on the phosphor screen undesirable colored deviation.

Several previous patents have addressed the problem of this globulate protuberance.The United States Patent (USP) of authorizing moral rice (Demmy) in February 6 nineteen sixty-eight N.3,368,098 point out, use the shadow mask-framework pad of limited quantity to eliminate or reduce the disadvantageous distortion of planar mask between the temperature rise phase of picture tube work.The U.S. Patent No. 3 of authorizing bright (Long) on June 15th, 1971,585,431 disclose the version of a kind of cutting shadow mask shirt rim, wherein, shadow mask is to be welded in like this on the framework, makes to allow that in the process that pipe warms up planar mask leaves the radial motion on frame perimeter surface.Point out in the U.S. Patent No. 3,862,448 that on January 21st, 1975 was authorized people (Ishizuka et al.) such as Shi Jie, use the block bed course reduced reducing in the shadow mask shirt rim because of the caused stress in planar mask of planar mask heating.The U.S. Patent No. 4,099,086 of authorizing people (Roder et al.) such as Luo Deer on July 4th, 1978 discloses a kind of shadow mask shirt rim, near the jagged angle of departure tongue piece that limits of corner of planar mask.This tongue piece is crooked shape, and is soldered on the shadow mask frame, in one embodiment tongue piece so that groove is arranged or gauffer so that a kind of turnover effect (a hinge effect) to be provided.

Though all these have patent to solve and the relevant particular problem of they applied picture tube casts earlier, more nearest picture tube design then requires to find out other way and solves because of the planar mask caused problem that expands.One of picture tube design that these are more nearest has been used a kind of more flat, is the planar mask of rectangle more realistically.

According to the present invention, done a kind of improvement in color picture tube, this picture tube comprises that vacuumizes a shell, and this shell has a rectangular faceplate panel that has major axis and minor axis, wherein, picture tube center longitudinal axis perpendicular to this major axis and minor axis passes through fluoroscopic center.This fluorescence panel comprises a planar mask, and this planar mask is at many somes place, comprises the point on its angle, welds together with the peripheral frame that is installed in the fluorescence panel.This framework comprises a flange that is parallel to center longitudinal axis approx.This planar mask comprises a shirt rim on every side that is parallel to center longitudinal axis approx.The improvement of picture tube includes the planar mask of rescinded angle, and wherein, the shirt rim part on the angle is straight, flat and acutangulates corresponding to major axis and minor axis, and in approximate center of this straight and flat shirt rim part planar mask is soldered on the framework.

In a preferred embodiment, framework has rescinded angle, and wherein, the flange on the angle of each framework is that straight, flat reaching acutangulates corresponding to major axis and minor axis.The peripheral part of planar mask is consistent with the shape of flange, and can overlap thereunto relatively.The fillet welding contact that planar mask is linked on the framework is the center that is positioned at the straight and flat part of rescinded angle approx.

In the accompanying drawings:

Fig. 1 is the plane graph according to hole, a hurdle of the present invention planar mask cathode ray tube axial cross section;

Fig. 2 be Fig. 1 cathode ray tube phosphor screen and and the rearview of shadow mask one frame assembly;

Fig. 3 is the corner part plane graph that has partially opened of shadow mask one frame assembly of a prior art;

Fig. 4 is the plane graph of the corner part that has partially opened of the shadow mask-frame assembly of pipe shown in Figure 1;

Fig. 5 is the sectional view of the corner part of the shadow mask-frame assembly that obtains from the 5-5 of Fig. 4 line;

Fig. 6 is the vertical view at a turning of the framework of pipe shown in Figure 1;

Fig. 7 be according to partially opening of another shadow mask-frame assembly of the present invention the plane graph of a corner part;

Fig. 8 be according to the part of another shadow mask-frame assembly of the present invention opened the plane graph of corner part.

Fig. 1 and Fig. 2 have shown a kind of color picture tube 18, and its glass shell that vacuumizes 20 comprises a rectangular faceplate panel 22 and the neck 24 that is connected with funnel portion 26.Fluorescence panel comprises two normal axis: be parallel to it than the major axis X-X of broadside (normally level) and be parallel to the minor axis Y-Y of its narrow side (normally vertical).Major axis and minor axis are perpendicular to the center of passing through neck 24 and the center longitudinal axis Z-Z at panel 22 centers.Panel 22 by look see phosphor screen 28 and periphery flange in other words limit wall 30 constitute, this limit wall is bored 26 sealing-ins mutually with glass material 27 with pipe.Three look cathode electronics photoluminescence linear fluorescents screen 32 is positioned at the inner surface of panel 28.Phosphor screen 32 is made up of a fluorescent material lines battle array that is arranged essentially parallel to picture tube minor axis Y-Y extension.The mass part of phosphor screen 32 can have a light absorbing material by mode known in the prior art is topped.Hole, novel hurdle colour selection electrode planar mask 34 in other words is connected on the novel L type framework 35 and constitutes planar mask-hurdle aperture member 33, with four springs 42 this assembly 33 is installed within the assembly 22 movably, assembly 33 has a predetermined each interval relation with respect to phosphor screen 32.Planar mask 34 comprises hole, many slot shape hurdles, and there is the separately brace of slot in these holes, hurdle to be that the mode of parallel columns is alignd basically in each row.L shaped framework 35 comprises two flanges 36 and 37.First flange 36 extends and parallels with center longitudinal axis Z-Z approx to phosphor screen 32.Second flange 37 extends internally and approx perpendicular to central shaft Z-Z.Planar mask 34 also comprises a shirt rim 41 that can set up with respect to frame edge 36.

An in-line gun 39(is illustrated) be installed in the neck 24 to produce and to guide three electron beam 38B, 38R and 38G to assemble path by planar mask 34 arrival phosphor screens 32 along coplane.

Design picture tube 18 uses itself and outside magnetic deflection coil 40 together, and coil 40 is around neck 24 and funnel portion 26, and close the two joint.When suitable voltage was added on the deflecting coil 40, three electron beam 38B, 38R and 38G were subjected to the effect of quadrature field and make electron beam form scanning with rectangular raster on phosphor screen 32.

Fig. 3 shown a kind of prior art shadow mask-frame assembly 33 ' corner part, this assembly comprise be connected peripheral frame 35 ' on hole, hurdle planar mask 34 '.Shadow mask 34 ' and framework 35 ' the turning be round, and planar mask 34 ' point 44 places on the turning be soldered to framework 35 ' on.Because planar mask 34 ' crooked on the turning, planar mask 34 ' be relatively firm on the turning, almost there is not any flexibility.Embodiment of the present invention provide that to have a bigger turning than this class prior art structure flexible and do not need to use as some needed otch of other prior art structure and contact pin.

Fig. 4,5 and 6 has shown the detail drawing of the novel shadow mask plate-frame assembly 33 in the picture tube 18.The prior art assembly 33 of this novel shadow mask plate-frame assembly 33 and Fig. 3 ' main marked difference be that the former edge is more straight and the turning is clipped.First flange 36 of framework 35 is that straight, flat reaching acutangulates with respect to major axis X-X and minor axis Y-Y on frame corner.The shape of the peripheral part of planar mask 34 and first flange 36 is consistent and be enclosed on the flange.The shirt rim 41 of each acutangulate corner part of planar mask 34 is soldered on the rescinded angle of framework 35 at point 46 places, and point 46 is the centers that are positioned at straight and flat frame corners approx.Solder joint also allows maximum radial compliance near the far-end (the distal end) of shirt rim 41.

The prior art shadow mask-frame assembly 33 of Fig. 3 ' in, round the turning and be in a little a bit strict with respect to the status requirement of the solder joint 44 of the far-end of planar mask.The little variation that departs from the predetermined design position just can produce big influence to the expansion and the globulate protuberance of planar mask.Yet in new planar mask-frame assembly 33, the position of the solder joint 46 on rescinded angle is not to require harshness so, thereby has reduced by planar mask to the difference the caused picture tube of the variation of the welding of framework.This advantage is partly to be had than big flexible causing by the straight flat of shadow mask shirt rim 41 at the rescinded angle place.This flexibility also causes the opposing of planar mask expansion less, thereby the bulbous protrusions of planar mask is less.

Can change because of the change of the straight flat partial-length A at turning in the flexibility of the planar mask shirt rim at rescinded angle place.Short length A will cause less flexibility, and long length A will cause bigger flexibility.In some application scenario, clipping of planar mask-frame assembly turning can cause undesirable shadow mask microphony because of the flexibility of planar mask.This microphony can be as indicated in Fig. 7, to the correction of the rescinded angle of planar mask-frame assembly 48 and controlled.Planar mask-frame assembly 48 comprises the planar mask 50 that is connected to L shaped peripheral frame 52.Each turning of planar mask-frame assembly 48 comprises three complete continuous straight portion 54,56 and 58, and all parts acutangulate corresponding to major axis and minor axis.Planar mask 50 is put 60 places at the approximate center of central segment 56 and is soldered on the framework 52.By length or the angle that suitably changes these sections, distinctive microphony problem can be controlled.

Though show, planar mask is enclosed within on the framework in above-mentioned planar mask-frame assembly 33, also can be at planar mask-frame assembly 33 " in use rescinded angle, as shown in Figure 8, in this assembly, planar mask 34 " be embedded in framework 35 " within.At assembly 33 " in, planar mask 34 " size be slightly less than framework 35 ", like this, at planar mask 34 " and framework 35 " between exist gap 62.Gap 62 is used for reserving the place for the expansion of planar mask.Planar mask 34 " link framework 35 " be to realize that by cutting on the planar mask shirt rim or projection 64 projection stretches out and framework 35 " contact.On the other hand, framework can have inside extension so that and contacted contact pin of planar mask or projection.

Claims (2)

1, a kind of color picture tube with a vacuum casting, have one to have the rectangular faceplate panel of major axis and minor axis on its vacuum casting, the center of the center longitudinal axis of said pipe by said fluorescence panel is also perpendicular with major axis and minor axis, said fluorescence panel comprises a planar mask, the flange of the peripheral frame that the shirt rim on every side of this planar mask is interior with being installed in fluorescence panel is consistent, shirt rim and said flange are parallel to said center longitudinal axis approx around said, and this shirt rim is at many somes place, the turning that comprises it is in interior some place and the welding of said flange, it is characterized in that said planar mask (34) and said framework (35) have rescinded angle, causing shirt rim (41) part of said planar mask corner and the flange (36) at said frame corner place is straight partly, and with said major axis and minor axis (X-X, Y-Y) acutangulate, and the turning solder joint is positioned at the central point (46) of said and major axis and the acutangulate straight portion of minor axis approx and locates.

2, a kind of color picture tube with a vacuum casting, have one to have the rectangular faceplate panel of major axis and minor axis on its vacuum casting, the center of the center longitudinal axis of said pipe by said fluorescence panel is also perpendicular with major axis and minor axis, said fluorescence panel comprises a planar mask, the flange of the peripheral frame that the shirt rim on every side of this planar mask is interior with being installed in fluorescence panel is consistent, shirt rim and said flange are parallel to said center longitudinal axis approx around said, and this shirt rim is at many somes place, the turning that comprises it is in interior some place and the welding of said flange, it is characterized in that the shirt rim part of said shadow mask corner and the flange portion at said frame corner place are by three complete continuous straight portion (54,56,58) constitute they and said major axis and minor axis (x-x, y-y) acutangulate.

Images