CN1265519A

CN1265519A - Tension shadow mask and frame assembly of planar cathode-ray tube

Info

Publication number: CN1265519A
Application number: CN00104509A
Authority: CN
Inventors: 申淳澈; 片度勋; 金完
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 1999-01-22
Filing date: 2000-01-22
Publication date: 2000-09-06
Also published as: KR100322065B1; KR20000051452A; JP2000215824A

Abstract

To reduce the deformation of a shadow mask by tensile force and the vibration by external shocks by connecting the strips of the shadow mask with tie bars, and supporting short side sections with support members. A pair of support members 31, 32 provided at the prescribed interval together with first and second support members 31a, 32a on a frame 30 supporting a shadow mask 20 for the prescribed tensile force are supported by a pair of U-shaped elastic members 33, 34 at both end sections. The deformation by tensile force and the vibration by external shocks of the shadow mask 20 supported at short side sections are reduced by one or more support members 35 welded with bars 35 having the prescribed height at the center sections of the elastic members 33, 34. End sections of one or more elastic pieces supported by the elastic members 33, 34 and energized upward and downward may be kept in contact with the lower faces and upper faces of the short side sections of the shadow mask 20.

Description

The tension mask of Flat CRTs and frame assembly

The present invention relates to Flat CRTs (CRTs), the particularly tension mask of plane CRT and frame assembly have wherein improved the assembly structure of shadow mask and framework.

In CRTs, on phosphor screen, shield by the hole land that are formed on the shadow mask from electron gun electrons emitted bundle, thereby form image with fluorescence excitation.Consider electron beam deflecting track, the phosphor screen surface of the conventional CRT of above-mentioned formation image is designed to have predetermined inner curvature, wherein after electron gun is launched electron beam, makes the electron beam deflecting by deflection system.And design its shadow mask with the curvature of corresponding phosphor screen surface curvature.

The conventional CRT that constitutes with the curvature identical with the phosphor screen surface curvature can produce the protuberance problem, is that hot electron can heat shadow mask and it is swelled to the screen dish from electron gun electrons emitted bundle wherein.The protuberance problem can hinder the accurate land of electron beam to phosphor screen.And because the phosphor screen surface that forms has predetermined inner curvature, so the visual angle narrows down, and makes the anamorphose that forms at its edge.

Consider these problems, developed plane CRT with plane fluorescent screen surfaces.In the CRT of plane, the screen dish forms flat shape, and shadow mask is fixed on the screen dish under tension force, and spaced a predetermined distance from the phosphor screen that is formed in the screen dish.This screen dish links to each other with the glass awl, and electron gun and deflection system are arranged in this glass awl.

U.S. patent No.4900977 relates to the support system of the shadow mask that is used for flat panel.In this support system, support belt is installed in to have in the panel of the seal area at its edge, and tension mask is fixed to the end of this support belt.

But, under situation about as mentioned above tension mask being assembled on the panel, hermetic unit must form stepped, therefore such problem can appear, promptly according to the cooperating of support belt and panel, tension mask and be formed on interval between the phosphor screen in the panel promptly to be commonly referred to the Q-interval variation very big.

For avoiding this problem to occur, advised shadow mask is fixed to method on the additional frame that is installed in the screen dish.Having the tension mask of this structure and the example of frame assembly is shown among Fig. 1.As shown in Figure 1, tension mask and frame assembly comprise framework 10 and planar aperture mask 16, framework 10 have parallel support component 11 with 12 with the elastomeric element 13 and 14 that can apply elastic force and be connected with 12 with support component 11, thereby planar aperture mask 16 has each other with predetermined space and separates a plurality of 15 of the slit determined between each bar.Planar aperture mask 16 is welded on the long limit of support component 11 and 12, so tension force acts on support component 11 and 12.

In this tension mask and frame assembly, the tension force that affacts on the shadow mask is increased by the long limit that 16 of shadow masks is welded to support component 11 and 12.As a result, some bar 15 near shadow mask 16 minor faces may shrink at the middle part.And, the problem of bar 15 bendings of slit can appear determining.

Have under a plurality of the shadow mask situation above-mentioned, for preventing to pass a plurality of and aim at electric wires owing to external impact makes the bar vibrations.Yet this situation requires shadow mask to have predetermined curvature at long side direction, therefore is difficult to form the shadow mask on complete plane.

For avoiding this problem, use connecting rod 18 that the adjacent strip 17 of shadow mask is interconnected each other.This bar 17 with connecting rod 18 interconnection has the certain anti-vibration or the ability of resistance to deformation.But the shadow mask minor face parallel with bar 17 without any hanging with supporting, so the minor face of shadow mask is subjected to the vibration of external impact easily.

For addressing the above problem, the purpose of this invention is to provide the tension mask and the frame assembly of planar coloured cathode ray tube (CRT), wherein prevented because the slit contraction of being determined by adjacent strip is avoided in the vibration of the bar in the shadow mask that external impact causes thus.

Above-mentioned purpose is to realize by the tension mask of Flat CRTs according to the present invention (CRT) and frame assembly, comprise: framework, thus comprise a pair of support component that support section is respectively arranged and be fixed to a pair of elastomeric element of the two ends of described a pair of support component with predetermined space supported parts; Shadow mask, comprise mainboard, a plurality of and a plurality of connecting rod, wherein the long limit of mainboard face one another and by this to support component in the tension force lower support, thereby described a plurality of are formed on predetermined space and determine slit that electron beam is passed through in the mainboard, and described a plurality of connecting rods are used for making the adjacent strip interconnection with predetermined space; With at least one pair of support, each support is installed in the described a pair of elastomeric element that is inserted between the support component, is used to support each minor face of shadow mask.Preferably, support is supported by elastomeric element, and the one end supports the minor face of shadow mask.

Make above-mentioned purpose of the present invention and advantage more cheer and bright by introducing preferred embodiment with reference to the accompanying drawings in detail, wherein:

Fig. 1 is the conventional tension mask of color cathode ray tube (CRT) and the perspective view of frame assembly;

Fig. 2 is the conventional tension mask of another color CRT and the perspective view of frame assembly;

Fig. 3 is according to the tension mask of planar coloured CRT of the present invention and the perspective view of frame assembly;

Fig. 4-7 represents the example according to the support of the tension mask of planar coloured CRT of the present invention and frame assembly;

Fig. 8 is the enlarged diagram of the part A of shadow mask shown in Fig. 3.

As shown in Figure 3, according to planar coloured cathode ray tube of the present invention (CRT) thus tension mask and frame assembly comprise as the shadow mask 20 of color selector spare and be used to support the framework 30 that shadow mask 20 is applied to it predetermined tension.Framework 30 comprises a pair of

support component

31 and 32 that the first and

second support section

31a and 32a are arranged respectively, and

support component

31 and 32 is supported and spaced-apart preset distance by a pair of elastomeric element 33 and 34.In other words,

elastomeric element

33 and 34 two ends are fixed to the two ends of first and

second support components

31 and 32, thereby support first and

second support components

31 and 32 with first and

second support components

31 and 32 modes spaced apart by a predetermined distance.And, in order to prevent from during annealing, to act on the overtension on the shadow mask 20, can the bimetal leaf (not shown) be installed at the basal surface of each

elastomeric element

33 and 34, so that

elastomeric element

33 and 34 bendings, thereby allow that first and

second support components

31 and 32 are adjacent to each other.In addition,

elastomeric element

33 and 34 shape are not limited to special shape.But, preferred U-shaped elastomeric element 33 and 34.For the purpose same, can form the groove part (not shown) at the middle part of each

elastomeric element

33 and 34 with bimetal leaf.In addition, pair of brackets 35 is installed on

elastomeric element

33 and 34, is used for supporting shadow mask 20 at its minor face.Support 35 can be the rod that predetermined altitude is arranged, and is welded to the middle part of each elastomeric element 33 and 34.The position of support 35 is not limited to the middle part of above-mentioned

elastomeric element

33 and 34, and can separate a plurality of supports of installation to its two ends with preset distance from the middle part of elastomeric element 33 and 34.And bar-shaped support 35 can be fixed on the side of

elastomeric element

34 and 35, not on

elastomeric element

34 and 35.

Fig. 4 represents to be installed in the another example of the support on elastomeric element 33 and 34.As shown in Figure 4, the support that is used to support the shadow mask minor face can be a spring leaf 36.One end of spring leaf 36 curves the right angle and is fixed on each

elastomeric element

34 and 35, and the other end has curved shape and applies elastic force with the minor face to shadow mask 20 and contact with the basal surface of shadow mask 20.

Another example is shown among Fig. 5.Opposite with support 36 shown in Figure 4, an end of the elastic support 37 shown in Fig. 5, promptly an end that contacts with the minor face of tension mask also bends to the right angle, and is the same with the other end on being fixed to elastomeric element, and forms sweep 37a.And sweep 37a contacts with the upper surface of tension mask, thus under the tension force that elastic support 37 applies with its minor face fix in position.Can also as Fig. 6 and 7, change the fixedly structure of the elastic support 37 of tension mask minor face.As shown in Figure 6, with preset distance from its end cut sweep 37a with the cutting tension mask.In another case, stator 37a can form jack 37b, as shown in Figure 7 attached on the sweep 37a.This jack 37b receives the minor face of tension mask in shadow mask minor face insertion mode wherein.

Fig. 8 is the enlarged diagram of the part A of shadow mask shown in Fig. 3.Shown in Fig. 3 and 8, the shadow mask 20 that is supported by framework 30 has thin mainboard 21, installs a plurality of 22 that separate with predetermined space in this thin mainboard 21, thereby determines slit 23 that electron beam is passed through.Can form bar 22 and slit 23 by corrosion mainboard 21.And, can regulate the width of the slit of determining by bar 22 23 according to the incidence angle of electron beam, wherein electron beam incides in the slit 23 after being deflected system's deflection.In addition, as shown in Figure 8, form a plurality of connecting rods 24, these connecting rods pass the adjacent bar of slit 23 interconnection.Consider the length of slit 23 and the quantity how bar 22 keeps determining at interval connecting rod 24 well.Determine the width of connecting rod 24 with such limit, promptly when passing slit 23 land cut apart by connecting rod 24 from electron gun electrons emitted bundle, do not show the reflection image of connecting rod 24 at the phosphor screen (not shown).

In the structure of tension mask and frame assembly, two support section 31a and the 32a by first and

second support components

31 and 32 supports perpendicular to the long limit of the mainboard 21 of the bar 22 of shadow mask 20.The minor face of the mainboard 21 of the shadow mask 20 parallel with bar 22 contacts with

support

35,36 or 37 or is fixed by it.

The tension mask and the frame assembly that have said structure according to the present invention are installed among the CRT of plane, thereby allow from the accurate land of electron gun electrons emitted bundle on each fluorescent material, and the clear display chromatic image.In this tension mask and frame assembly, support the long limit of tension mask 20 by first and

second support components

31 and 32, support the minor face of tension masks 20 by support 35, can prevent that therefore the shadow mask 20 that the tension force of effect when tension mask 20 is welded on the framework 30 causes from shrinking at the minor face middle part.In addition, support by

support

36 or 37, can avoid the shadow mask minor face vibration that causes by external impact owing to be parallel to the shadow mask minor face of the bar 22 that interconnects by connecting rod 24.

Shown in Fig. 4-7, support forms spring leaf, and the one end upwards applies elastic force and contact in shadow mask minor face and shadow mask bottom, perhaps applies elastic force downwards by fixing shadow mask minor face.Like this, can reduce the externally vibration of effect of impact shadow mask minor face of generation when CRT goes up, therefore having shortened the tension mask that makes vibration stablizes the needed time.

As mentioned above, in the mentioned strain shadow mask and frame assembly of the plane CRT according to the present invention, the adjacent strip of tension mask interconnects by connecting rod, and, therefore can reduce the vibration of the bar that causes by the contraction of a plurality of definite slits with by external impact with the mode that contacts with the tension mask minor face or be coupled minor face by the stent support tension mask.

The front has been represented with reference to specific embodiments and has been introduced the present invention, but further improvement in the spirit and scope of the present invention of being determined by appended claims and remodeling are obvious to those skilled in the art.

Claims

1, the tension mask and the frame assembly of a kind of Flat CRTs (CRT) comprising:

Framework, thus comprise a pair of support component that support section is respectively arranged and be fixed to this supports this support component with predetermined space to the two ends of support component a pair of elastomeric element;

Shadow mask, comprise mainboard, a plurality of and a plurality of connecting rod, wherein the long limit of mainboard face one another and by described a pair of support component in the tension force lower support, described a plurality of are formed on the slit to determine electron beam is passed through in the mainboard with predetermined space, and described a plurality of connecting rods are used for predetermined space interconnection adjacent strip; With

At least one pair of support, each support are installed in the described a pair of elastomeric element that is inserted between the support component, are used to support each minor face of shadow mask.

2, according to the tension mask and the frame assembly of claim 1, its medium-height trestle is to be become by at least one pair of clavate, and described a pair of rod is supported by elastomeric element respectively, and the one end is fixed to the minor face of shadow mask.

3, according to the tension mask and the frame assembly of claim 1, its medium-height trestle is to be formed by at least one pair of spring leaf, and described spring leaf is supported by elastomeric element respectively, and the one end contacts with mask blank is surperficial, thereby upwards applies elastic force.

4, according to the tension mask and the frame assembly of claim 1, its medium-height trestle is to be formed by at least one pair of spring leaf, and described spring leaf is supported by elastomeric element respectively, and the one end contacts with the shadow mask upper surface, thereby applies elastic force downwards.

5, according to the tension mask and the frame assembly of claim 1, its medium-height trestle is to be formed by at least one pair of spring leaf, and described spring leaf is supported by elastomeric element, and the one end curves the right angle, is used for fixing the minor face of tension mask.