CN1111392A

CN1111392A - Color picture tube having an improved shadow mask

Info

Publication number: CN1111392A
Application number: CN94118408A
Authority: CN
Inventors: P·施平纳; P·E·科斯马
Original assignee: VIDEOCOLOR Spa
Current assignee: VIDEOCOLOR Spa; Videocolor SpA
Priority date: 1993-11-19
Filing date: 1994-11-18
Publication date: 1995-11-08
Also published as: JPH07192649A; ITMI932461A1; KR950015501A; IT1265204B1; TW301757B; ITMI932461A0; EP0654810A1

Abstract

The color picture tube (8) comprises an envelope (10) having a rectangular face plate panel (12). The face plate panel comprises a screen (22) on the inside surface and a shadow mask (24) installed inside the panel. The shadow mask comprises a lacunaris outline part (26) and a reinforcing structure (42) installed in the peripheral of the lacunaris outline part. The reinforcing structure and a part of the mask (30) form a box-like frame (43) surrounding the peripheral part of the mask. The reinforcing structure is made of a material having approximately the same thickness as the material of the lacunaris outline part of the shadow mask.

Description

Color picture tube having an improved shadow mask

The present invention relates to shadow mask and be suspended on a kind of color picture tube on the negative electrode optical screen, particularly a kind of through improved light-duty shadow mask.

Along with the increase of colorful visualization pipe volume, the volume and weight of each element of picture tube also correspondingly increases.One of them element is a shadow mask-frame assembly.Present tricolour picture tube steel frame supports shadow mask in the panel panel of picture tube.Wherein a kind of framework is made by the continuous L font steel bar that welds in each end bending.Another kind of framework then is that the shape that flat steel sheets strikes out framework is made.In general, the 31V picture tube that screen diagonal side is 79 centimetres, its above-mentioned the sort of framework is made by thick 1.00 millimeters (0.039 inches) heavily about 1.63 kilograms (3.16 pounds) materials.The thickness of other framework can reach 1.51 millimeters (0.062 inches), and weight also correspondingly increases.Framework is rectangular usually, supports in the panel panel with three or four springs that are fixed on the framework; Not so framework also can support at Qi Sijiao.The United States Patent (USP) 4,728,853 that was presented to people's such as Sone United States Patent (USP) 4,728,088 on February 2nd, 1988 and was presented to people such as Sone on March 1st, 1988 has been introduced this four jiaos of embodiment that support.

Because traditional shadow mask-frame assembly is quite heavy, if therefore need not to use support frame just can alleviate the total weight of picture tube.The invention provides a kind of shadow mask that does not adopt conventional frame.

The present invention is through improved color picture tube, and its glass bulb has the panel panel of a rectangle.The inner surface of panel has a viewing screen, and a shadow mask is housed in the panel.Shadow mask has a porous outline portion, and the periphery of this part is with a reinforcement.The part of reinforcement and shadow mask constitutes the box-shaped involucrum around shadow mask.Strengthening wants member to be made by thickness and shadow mask material about equally.

In the accompanying drawing:

Fig. 1 is the axial section end view of the color picture tube of the embodiment of the invention;

Fig. 2 is the panel panel of Fig. 1 picture tube and the bottom view of shadow mask four/part;

Fig. 3 is the cutaway view of shadow mask along the 3-3 line intercepting of Fig. 2;

Fig. 4 is the top view of four angle brackets and spring;

Fig. 5 is four angle brackets of Fig. 4 and the front view of spring;

Fig. 6 is shadow mask, four angle brackets and the spring cutaway view along the 6-6 line cross section of Fig. 2;

Fig. 7 is the cutaway view of the second shadow mask embodiment;

Fig. 8 is the cutaway view of the 3rd shadow mask embodiment;

Fig. 9 is the cutaway view of the 4th shadow mask embodiment.

Fig. 1 shows rectangular color picture tube 8, and the glass bulb 10 of picture tube has panel panel 12 and tubular neck 14 of a rectangle, and both couple together with rectangle glass awl 16.Panel 12 has one to watch panel 18 and periphery flange or sidewall 20, and sidewall 20 is sealed on the glass awl 16.Inlay on the inner surface that tricolour phosphor screen 22 is placed in panel 18.Phosphor screen is line-screen preferably, the phosphor strip vertical extent that it is parallel.Not so phosphor screen also can be the point type screen.Porous color selection electrode or shadow mask 24 are removably being installed, the distance predetermined at interval with phosphor screen 22.Electron gun 25 is contained in the center of neck 14, along by the convergence path of shadow mask 24 three-beam electron-beam being guided on the phosphor screen 22.

The picture tube of Fig. 1 is prepared to design with outer electromagnetic deflection coil 28 adapteds that are located at glass awl/neck intersection.When being excited, deflecting coil 28 makes three-beam electron-beam be subjected to the effect in magnetic field, impels electron beam with the form level of rectangular raster and the surface of the whole phosphor screen 22 of vertical scanning.

Fig. 2 and Fig. 3 illustrate in greater detail shadow mask 24.Shadow mask 24 has the peripheral lateral margin 30 of a porous outline portion 26.Shadow mask is installed in panel panel 12 by being arranged in its four strutting pieces 34 of four jiaos.One of them this strutting piece 34 has been shown among Fig. 2.Each strutting piece 34 has a bolt that is embedded in panel sidewall 20 36, a spring 38 that engages with bolt 36 and a carriage 40 that is fixed on the lateral margin 30 of shadow mask.Not so the also available strutting piece that is provided with along the shadow mask limit of shadow mask 24 is sling.

Shadow mask 24 is not color to strengthen framework with that a kind of thick periphery as the prior art instruction.On the contrary, lateral margin 30 usefulness of shadow mask 24 are the C font is fixed to lateral margin 30 inner surfaces at periphery weak strong component 42 enhancings usually.The C font is to become α angle and right angle β to form in the cross section of member 42.Reinforcement 42 and lateral margin 30 form solid box-shaped involucrum 43 around the shadow mask periphery, are formed three limits of involucrum by reinforcement.The thickness of reinforcement 42 materials is identical with material for shadow mask haply, for example 0.229 millimeter (0.009 inch).The framework that this sort of thickness compared with prior art can reach 1.51 millimeters (0.062 inches) is wanted Bao Deduo.Therefore, because reinforcement 42 is more light than the framework of prior art, so the shadow mask frame assembly of just heavy than the sort of employing of the prior art peripheral frame of the mask assembly of tool box-shaped involucrum is light.

Fig. 4,5 and 6 illustrates in greater detail spring 38 and carriage 40.One end of spring 38 is welded on the carriage 40, and the other end of spring has a hole 44, and stud 36 is in the embedded hole 44.Carriage 40 has a core 46 and two

upper arm

48 and 50, and spring 38 promptly is welded on the core 46.Two

arms

48 and 50 extend along the limit of adjoining of shadow mask, are welded to the outer surface of shadow mask lateral margin 30.Though shown in the first embodiment of the present invention is to adopt that of C font reinforcement a kind of, the box-shaped surrounding member of shadow mask also can be formed by difform part.The modification of most preferred embodiment part for example, has been shown among Fig. 7.Among Fig. 7, the box-shaped involucrum 61 that can see shadow mask 60 is made of the reinforcement 62 of C font, and two right angles are arranged in the cross section of reinforcement 62.Among Fig. 8, iron nickel shadow mask 70 has the lateral margin of a U font to form one side of box-shaped involucrum 73.The remainder of involucrum 73 then is made of outer surface that is fixed on lateral margin 72 peripheral each points 76 and the C character form component 74 that is fixed on the U font bottom of lateral margin periphery each point 78.The flange 79 of member 74 extends towards the shadow mask center, as the shielding part of electron beam overscanning.Shadow mask 80 shown in Figure 9 is similar with Fig. 8 embodiment's, has U font lateral margin 82 and C character form component 84, forms the involucrum 86 of box-shaped, and just member 84 contacts with the U font of lateral margin 82 outside the branch.

The quantity of material that the shadow mask of making by the present invention and mask support member are used is minimum, and is a kind of light compared with using that of framework. This not only reduces manufacturing cost, improves hot property, but also has reduced the warping phenomenon in the long-term work process. The material of reinforcement is thinner, easier processing, but The finished product of mask assembly and support member is still solid to be enough to bear mechanical shock and vibration.

Claims

1, a kind of color picture tube (8), its glass bulb (10) have the panel panel (12) of a rectangle, and the inner surface of described panel has a viewing screen (22), by means of strutting piece (34) shadow mask are housed in the panel, and described picture tube is characterised in that:

Described shadow mask has a porous outline portion (26) and a reinforcement (42,62); The latter is fixed on described porous outline portion periphery, and the part of described reinforcement and described shadow mask (30,64,72,82) forms box-shaped involucrum (43,61,73,86), and the material identical materials that is turning around the described porous outline portion of described shadow mask is made.

2, picture tube as claimed in claim 1, it is characterized in that, described strutting piece (34) is placed in four jiaos of described panel (12), and a carriage (40) and a spring (38) are arranged, and described carriage has a core (46) and two arms (48,50), this two arm (48,50) extend along the limit of adjoining of described shadow mask (24), be welded on the described shadow mask, described spring then is welded on the described core.

3, a kind of color picture tube (8), its glass bulb (10) has the panel panel (12) of a rectangle, and the inner surface of described panel has a viewing screen (22), by means of being positioned at its strutting piece of four jiaos (34) shadow mask (24 is housed in the panel, 60,70,80), described shadow mask has a porous outline portion (26) and peripheral lateral margin (30,64,72,82), described picture tube is characterised in that:

Described shadow mask has a C font reinforcement (42,62,74,84) be fixed on described lateral margin periphery, described reinforcement and described lateral margin form the box-shaped involucrum (43,61,73 around described shadow mask periphery, 86), and described reinforcement make by the roughly the same material of the material of the described porous part of thickness and described shadow mask.

4, picture tube as claimed in claim 3, it is characterized in that, described four jiaos of described strutting pieces (34) separately have a carriage (40) and a spring (38), described carriage has a core (46) and two arms that adjoin extension (48 along described shadow mask, 50), described each arm is welded on the described side edge portions (30), and described spring then is welded on the described core.

5, a kind of color picture tube (8), its glass bulb (10) has the panel panel (12) of a rectangle, and the inner surface of described panel has a viewing screen (22), by means of being positioned at its strutting piece of four jiaos (34) shadow mask (24 is housed in the panel, 60,70,80), described shadow mask has a porous outline portion (26) and peripheral lateral margin (30,64,72,82), described picture tube is characterised in that:

Described shadow mask has the reinforcement (42 of a C font, 62,72,80) be fixed on the inner surface of described lateral margin periphery, described reinforcement and described lateral margin form box-shaped involucrum (43,61,73,86), side coaming is around the periphery of described shadow mask, and described reinforcement is made by the roughly the same material of the material of the described porous part of thickness and described shadow mask.