CN1118082C

CN1118082C - Color picture tube having improved shadow mask-frame assembly support

Info

Publication number: CN1118082C
Application number: CN96112490A
Authority: CN
Inventors: 玛西摩·德玛里诺
Original assignee: VIDEOCOLOR Spa
Current assignee: VIDEOCOLOR Spa; Videocolor SpA
Priority date: 1995-11-07
Filing date: 1996-10-31
Publication date: 2003-08-13
Anticipated expiration: 2016-10-31
Also published as: IT1276086B1; ITMI952286A1; KR100466681B1; TW297131B; CN1157996A; KR970030136A; JP3898788B2; JPH09171778A; ITMI952286A0

Abstract

To reduce the possibility of sticking by a fourth spring without being affected by the curve of the compared the other three springs in a supporting system using four springs. A mask frame assembly 30 fixed with a supporting means arranged in the corner of a face plate panel 12 contains a shadow mask 24 fixed to a circumferential frame 32. The supporting means contains a plate 48 fixed to the frame 32 and a plate spring 46. The plat spring 46 is fixed to the plate 48 at its one end and has an opening hole at the other end which is free and engaged with a stud 44 fixed to the panel 12. In one corner part, the plate spring 46 contains an enlarged opening hole and a washer on it. The washer has an opening hole for engaging with the stud 44. The enlarged opening hole has a round part and a tapered part.

Description

Color picture tube with improved shadow mask-frame assembly support

Technical field

The present invention relates to a kind of color picture tube, it has a shadow mask that is connected on the perimeter frame, itself and the negative electrode cold light phosphor screen relation that becomes to dangle, be particularly related to a kind of modifying device of the mask-frame assembly that is used in picture tube, dangling, use a spring and the caused problem of a packing ring on the support column to eliminate or to be reduced in.

Background technology

In most color picture tubes, the shadow mask that is supported by perimeter frame is overhang in the panel by spring assembly, and this spring or directly be welded on the framework perhaps is welded on the flat board earlier and is welded on the framework.On direct welding manner, spring is made by bimetallic material usually; In dull and stereotyped mode, flat board is a bimetallic.When being heated when spring or the dull and stereotyped heat that transmits via framework from shadow mask, bimetallic expands but is inequality, thereby makes spring or plate bending cause the phosphor screen direction of shadow mask-frame assembly on panel to move.

In the large scale picture tube, in a rectangular panel, utilize four springs usually to support a shadow mask-frame assembly.Spring is positioned on four bights of framework to reduce assembly reversing and being shifted at panel.A Kong Yuyi metal column in each spring is connected, in the bight within this metal column embedding face glass.Award to people's such as Sone United States Patent (USP) the 4th, 723,088 and 4,723 on February 2nd, 1988 and on March 1st, 1988, once disclosed the instantiation that this bight is supported in No. 853.United States Patent (USP) the 4th, 723 shows a shade mask structure in No. 088, and it has the truncation bight of band strutting piece on each bight.These strutting pieces are crooked plate, in one end and framework welding, at the other end hole that is connected with metal column in the embedding panel sidewall are arranged then.United States Patent (USP) the 4th, 728, No. 853 announcement one shadow mask-frame assembly supports, it comprises two members that weld together.A member has a flat plate shape, is covering on the framework in several means of spot welds of separating.One end of second member is welded on first member, and is included in the hole of the other end, and this hole is connected with support column on the panel sidewall.

Use in the support system of four support springs one, on a spring, use a packing ring usually, such instruction is arranged as in No. the 3rd, 334,259, the United States Patent (USP) of awarding to Shrader on August 1st, 1967.Can recognize by using a packing ring: though three pillars can limit a supporting plane, it is quite difficult that the 4th pillar placed same plane exactly.Therefore three support springs all have the hole that its size dimension just in time is connected with each pillar, and the 4th spring has a bigger hole and a packing ring, and packing ring has the hole of appropriate size, and is welded on the spring.The purpose of using this packing ring is that the position in the 4th spring washer hole allows with respect to other three spring eyes that some are flexible so that all springs all suitably seat on its corresponding pillar.But, some problems may take place when using a packing ring on spring, pillar may all contact with spring and packing ring and stick together simultaneously.Advantage of the present invention is that this possibility of clinging can be reduced, and more can not influence the flexibility of the 4th spring with other three springs.

Summary of the invention

According to the present invention, a color picture tube comprises the glass shell of an emptying, has a rectangle screen dish, and it contains a panel and a sidewall on every side.Panel comprises that one is loaded on mask assembly wherein, and it is installed by the bracing or strutting arrangement that is positioned on the screen dish bight.Mask assembly comprises a shadow mask that is connected with perimeter frame.Bracing or strutting arrangement on each bight contains a screen dish and a lobate spring that is connected on the framework.Lobate spring is connected on the screen dish and on free second end at its first end has a hole, and this hole is connected with post on being connected on the screen dish.At least on a bight, lobate spring has one than macropore and comprise a packing ring.Packing ring has a hole that is connected with pillar.A bigger Kong Youyi circular portion and a tapering part.Tapering part stretches out to first end direction of the spring that is connected with the screen dish.

Description of drawings

By below in conjunction with the accompanying drawing detailed description of the preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be clearer.In the accompanying drawing:

Fig. 1 is the axial side profile of color picture tube of the present invention;

Fig. 2 is the screen dish of the picture tube among Fig. 1 and the quadrant bottom diagram of shadow mask-frame assembly;

Fig. 3 is the profile in a bight of the screen dish of displayed shadow mask frame assembly bracing or strutting arrangement;

Fig. 4 is the spring of prior art and the plane graph of packing ring;

Fig. 5 is the spring of prior art and the top view that packing ring suitably is positioned at the center and is connected with a support column;

Fig. 6 is the spring of prior art and the top view of packing ring, fails suitably to be positioned at the center and is connected with support column;

Fig. 7 is the plane graph of the spring with an amplification hole of prior art;

The plane graph of Fig. 8 for showing that spring pressure distributes;

Fig. 9 is the plane graph of a novel spring;

Figure 10 is the side view of Fig. 9 spring;

Figure 11 is the plane graph of Fig. 9 spring, has a packing ring on the spring;

Figure 12 is the spring of Figure 11 and the side view of packing ring.

Embodiment

Fig. 1 shows a rectangular color picture tube 8, and it has a glass shell 10, contains a rectangle screen dish 12 and a tubular neck portions 14, is connected by rectangular funnel 16.Screen dish 12 comprises watches panel 18 and a circumferential flange or sidewall 20, is sealed on the funnel.Screen dish 12 comprises two normal axis: major axis X, and with its a wide size parallel (level) and a secondary axes Y, with its narrow limit parallel (vertically).Main shaft and secondary axes are vertical with the center longitudinal axis Z of pipe, and this Z axle is by the center of neck 14 and the center of screen dish 12.Inlay the inner surface load of tricolour phosphor screen 22 by panel 18.Phosphor screen is preferably the line phosphor screen, and its photoluminescence line and secondary axes Y extend in parallel.Perhaps, phosphor screen also can be dot fluorescent screen.One porous cave selecting electrode for colour or shadow mask 24 are installed in the position that concerns with 22 one-tenth predetermined spaces of phosphor screen removably by a modifying device.Electron gun 26 is installed in the center of neck 14, passes through shadow mask 24 to phosphor screen 22 with the generation and three electron beams that lead along a converged paths.

The picture tube design Cheng Yuyi external magnetic deflection yoke of Fig. 1 is shared, as deflection wire Figure 28 be positioned at funnel and neck contact near.When starting, deflecting coil 28 makes three electron beams be subjected to the action of a magnetic field, and this magnetic field makes electron beam level and vertical scanning on the rectangular raster of phosphor screen 22.

Shadow mask 24 is the part of shadow mask-frame assembly 30, and this assembly also comprises a perimeter frame 32.Shadow mask-frame assembly 30 is positioned among the screen dish 12 in Fig. 1,2 and 3.Shadow mask-frame assembly 30 is installed within the screen dish by four in Fig. 2 and 3 improved bracing or strutting arrangements 34.

Framework 32 comprises two orthogonal haply flanges,

first flange

36 and 38 one-tenth L type profiles of second flange configuration.First flange 36 from second flange 38 to extend towards the direction of phosphor screen 22.Second flange 38 from first flange 36 to extend towards the direction of the central longitudinal axis Z of picture tube 8.Four bights 42 of framework 32 are truncate, with the diagonal approximate vertical of framework.

Shadow mask 24 comprises: a curve hole part 25; One atresia boundary member 27 is around hole part 25; And a skirt section 29, leave phosphor screen 22 from boundary member 27 replications and extend.Shadow mask 24 inlays in the inside of framework 32 and is welded in the inner surface of first flange 36.

Shadow mask-frame assembly bracing or strutting arrangement 34 is contained in each bight in four bights of framework and screen dish.Each bracing or strutting arrangement 34 comprises a lobate spring 46 and the flat board 48 that a post 44, dangles.Each post 44 is a cone-shaped metal member, is connected on the screen dish sidewall 20.Each flat board 48 is welded on the flange 36 at the truncated corner place of framework 32.One end of lobate spring 46 is connected another end of dull and stereotyped 48.Partly mesh near a free-ended hole 50 of each lobate spring 46 and the taper of a post 44.Dull and stereotyped 48 are sometimes referred to as intermediate plate (clip), are the bimetal structure of lamination, and two metal levels are arranged.A metal level of facing framework is the higher material of thermal coefficient of expansion, and another metal level is the lower material of thermal coefficient of expansion to lobate spring.

The spring 52 of prior art has weldering packing ring 54 thereon, shown in Fig. 4,5.Spring 52 has two, and each side all has a recess 55.Spring 52 comprises a big hole 56, and packing ring 54 comprises that one has the aperture 58 of appropriate size, to engage with a support column 60.In Fig. 5, two

holes

56 and 58 mutual centerings.But Fig. 6 shows contingent a kind of situation, and promptly can't align and pillar 60 is wedged simultaneously or cling spring 52 and packing ring 54 in

hole

56,58, shown in the circled regions 62 of Fig. 6.

One is significantly reduced this method of clinging problem for do a bigger hole 64 in spring 66, as shown in Figure 7.But the stress envelope at the spring 68 of as shown in Figure 8 picture tube shows: amplifying circular hole will impact very high stress at 69 places, zone of spring.The increase that increases the weight of to represent spring stress of shade among Fig. 8.Therefore amplify the deflection resistance that spring eye will reduce the spring middle body, this is undesirable.

Fig. 9 shows that one improves spring 70 in 10, is the combination of an improved spring 70 and packing ring 72 among Figure 11 and 12.Spring 70 has a straight sided 74 and a tear-drop shaped hole 76.There are a circular portion 78 and a triangle or tapering part 80 in hole 76.The diameter of the diameter of circular portion 78 and spring of the prior art 52 about equally.Tapering part 80 extends to the not extreme direction of spring, and this spring is connected on dull and stereotyped 48.As can be seen from Figure 8, tapering part 80 extends into the low stress zones of spring.Packing ring 72 has a hole 82, and it is identical with the corresponding aperture size of other three springs, and these three springs directly engage with its each pillar.Spring 70 has four parts, and each is angled each other.First 84 is welded on the flat board usually, on dull and stereotyped 48.Second portion 86 departs from from flat board, and with 84 one-tenth 15.46 ° of angles of first.Third part 88 by second portion 86 to extend with respect to 84 one-tenth 11.26 ° of angles of first.88 one-tenth 15.00 ° of angles of the 4th part 90 and third part.

In a preferred embodiment, one has 4 * 3 width of cloth shape when in the cornerwise picture tube of rectangle phosphor screen of 79cm, the thick lobate spring of stainless steel (for example Carpenter Custom 455) of 0.5mm is used for: combine with 1.854mm bimetallic plates thick and that 3.165cm is long, be used for a steel shadow mask; Combine with 1.575mm bimetallic plates thick and that 3.165cm is long, be used for a dilval shadow mask.

The maximum length of lobate spring is 4.475cm.The radius of the circular portion 78 in hole 76 is 5.5mm, and the length overall in hole 76 is 2.68cm.

Claims

1, a kind of color picture tube (8), the glass shell (10) that comprises an emptying, it has a rectangle screen dish (12), this screen dish (12) comprises a panel (18) and a sidewall (20) on every side, this screen dish comprises a mask assembly (30), be installed on wherein by the bracing or strutting arrangement on the bight that is positioned at this screen dish, this mask assembly (30) comprises that one is installed on the shadow mask (24) on the perimeter frame (32), this bracing or strutting arrangement comprises the flat board (48) and the lobate spring (46 that are connected on this framework, 70), this lobate spring is in its first terminal and dull and stereotyped connection, and a hole (50 is arranged at its second free end, 76), it engages with a pillar (44) that is connected on the screen dish; It is characterized by: at least in a bight of screen dish, this lobate spring (70) has one to amplify hole (76) and comprise a packing ring (72) thereon, has a hole (82) on this packing ring, engage with a pillar (44), this amplifies a Kong Youyi circular portion (78) and a tapering part (80), this tapering part is to first terminal extension of the spring that is connected with dull and stereotyped (48), and the described circular portion in described amplification hole is positioned at and corresponding position, the hole of described packing ring.

2, picture tube according to claim 1 is characterized by, and comprises that in a described bight peripheral shape of described lobate spring (70) of described packing ring (72) is different with the peripheral shape of all the other lobate springs (46) that do not contain a packing ring.

3, picture tube according to claim 1 is characterized by, and each limit (74) of this lobate spring (70) is straight on a described bight.