CN1387218A

CN1387218A - Panel screen forming device for CRT, and panel screen formed therewiht for CRT

Info

Publication number: CN1387218A
Application number: CN02120156A
Authority: CN
Inventors: 张泰斗
Original assignee: KOREA ELECTRICAL GLASS CO Ltd
Current assignee: KOREA ELECTRICAL GLASS CO Ltd
Priority date: 2001-05-21
Filing date: 2002-05-21
Publication date: 2002-12-25
Also published as: KR20020088311A; KR100432766B1

Abstract

The invention provides a CRT flat panel forming apparatus to improve efficiency of grinding process and to prevent distortion of the flat panel, which can maintain a predetermined balance of the flat panel, and a CRT flat panel forming apparatus produced maintaining a predetermined balance of the flat panel. The invention concerns the CRT flat panel forming apparatus and the CRT flat panel formed by using the same. The invention is characterized by that, at least one of a bottom surface of the accommodation portion and the press plane of the plunger has a curvature which is curved upward with respect to the horizontal surface.

Description

Panel screen forming device for CRT and with the cathode-ray tube flat screen dish of its shaping

Technical field

The present invention relates to panel screen forming device for CRT and with the cathode-ray tube flat screen dish of its shaping, particularly improve the panel screen forming device for CRT of shape of lower die and formpiston and the cathode-ray tube flat screen dish that is shaped with this device.

Background technology

Usually, cathode ray tube comprises: the screen dish of display image; Be incorporated into the funnel shaped cone at screen dish rear; And the neck that combines with cone.The screen dish comprises: the phosphor screen portion of display image; And from rearward crooked skirt section, the end of phosphor screen portion.

Common cathode-ray tube screen dish, front surface phosphor screen portion forwards forms agley, and the whole increase in space is set, and has the very difficult shortcoming of image recognition of angular zone.Therefore, proposition recently makes the flat screen dish of the front surface phosphor screen portion flattening of screen dish.But if merely make the phosphor screen portion flattening, then the mechanical strength of cathode ray tube descends, and during vacuum treatment, has the danger of the junction surface breakage of screen dish and cone in manufacturing process.Consider such problem, use recently and remove the flat screen dish in skirt section.

As shown in Figure 7, existing cathode-ray tube flat screen dish 210 is shaped with Square consisting of two isosceles right-angled triangles shape roughly, comprises upper face 212, lower surface 213 and connects side 214 between them.In the angle of lower surface 213 and side 214 cooperations, form oblique angle, bottom 218, in the angle of upper face 212 and side 214 cooperations, form upper bevel 216.

As shown in Figure 8, the flat screen dish building mortion that flat screen dish 210 is shaped comprises: the bearing 280 of going up configuration at rotatable rotating disk (not shown); But and with respect to the drift (not shown) of bearing 280 upper and lower settings.

Upper end at bearing 280, the lower die 270 that lower surface 213, oblique angle, bottom 218 and side 214 with flat screen dish 210 form is set, in the upper end of lower die 270, the metal-back mould 260 of the four square ring shape shapes that configuration forms the upper bevel 216 of flat screen dish 210.In addition, in the inboard of metal-back mould 260, be provided with can be up and down formpiston 250, the glass blocks that are provided in the lower die 270 are compressed, so that flat screen dish 210 is shaped.

According to such structure, if from glass melting path (not shown) glass blocks is put in the lower die 270, then formpiston 250 pressurizes to lower die 270 declines and to glass blocks.By the pressurization of formpiston 250, the refrigerating work procedure of flat screen dish 210 through stipulating at lower die 270 and metal-back mould 260 internal shapings moves to the so back operation of grinding step.

But, in so existing panel screen forming device for CRT, the forming face of the upper face 212 of flat screen dish 210 and lower surface 213 pairing formpistons 250 and lower die 270 is kept the state of general planar, so through the operation that flat screen dish 210 is formed and cools off, as shown in phantom in Figure 7 (for convenience of explanation, to illustrate turgidly than actual), produce the torsion phenomenon of the end regions of flat screen dish 210 with respect to the middle section protuberance.Therefore, not only, also there is the problem that is difficult to keep the degree of balance for the decrease in efficiency of the grinding step of protrusion.

Summary of the invention

Therefore, the object of the present invention is to provide the panel screen forming device for CRT that to remove torsion phenomenon, raising grinding step efficient, keep the degree of balance of regulation.

In addition, the object of the present invention is to provide the cathode-ray tube flat screen dish of the degree of balance that can keep regulation.

To achieve these goals, according to the present invention, provide a kind of panel screen forming device for CRT, this device comprises: the lower die that forms the accommodation section that holds glass blocks; But come the glass blocks that is contained in described lower die is pressurizeed, thereby the formpiston that described flat screen dish is shaped with respect to described lower die upper and lower settings; It is characterized in that: the bottom surface of described accommodation section and described formpiston add in the pressure surface at least one form with respect to the horizontal plane the upwards bend of lateral bending song.

Here, described bend preferably forms slowly to raise to middle section from end regions, and the scope that the height of described bend with respect to the horizontal plane has 0.1mm to 10mm is favourable.

On the other hand, according to another field of the present invention, above-mentioned purpose realizes by cathode-ray tube flat screen dish, it is characterized in that, this flat screen dish is made by the panel screen forming device for CRT of scheme 1, forms the flexure plane corresponding with described bend at least one in lower surface and upper face.

Here, described flexure plane preferably forms slowly to raise to middle section from end regions, and the scope that the height of described bend with respect to the horizontal plane has 0.1mm to 10mm is favourable.

Description of drawings

Fig. 1 is the sectional arrangement drawing of cathode-ray tube flat screen dish of the present invention.

Fig. 2 is the partial longitudinal section of the panel screen forming device for CRT of the present invention the 1st embodiment.

Fig. 3 is the part sectioned view of Fig. 2.

Fig. 4 is the enlarged drawing in Fig. 3 ' A ' zone.

Fig. 5 is the part sectioned view of the panel screen forming device for CRT of the present invention the 2nd embodiment.

Fig. 6 is the part sectioned view of the panel screen forming device for CRT of the present invention the 3rd embodiment.

Fig. 7 is the sectional arrangement drawing of existing cathode-ray tube flat screen dish.

Fig. 8 is the partial longitudinal section of existing panel screen forming device for CRT.

Embodiment

Below, present invention will be described in detail with reference to the accompanying.

As shown in Figure 1, the cathode-ray tube flat screen dish 10 of the present invention side 14 that has the upper face 12 that forms by Square consisting of two isosceles right-angled triangles shape roughly and lower surface 13 and between them, form.

In the angle of lower surface 13 and side 14 cooperations, form oblique angle, bottom 18, in the angle of upper face 12 and side 14 cooperations, form upper bevel 16.In addition, lower surface 13 and upper face 12 with respect to the horizontal plane form with the flexure plane of the lateral bending song that makes progress.

Flexure plane is formed respectively by the bottom surface 71 of lower die described later 70 accommodation sections and the pressure surface 51 that adds of formpiston 50, prevents the torsion phenomenon of end regions with respect to the middle section protuberance of flat screen dish 10.

At this moment, each flexure plane forms slowly to raise to middle section from end regions, and it highly with respect to the horizontal plane has the scope of 0.1mm to 10mm.

As shown in Figure 2, the panel screen forming device for CRT of the present invention that such flat screen dish 10 is formed comprises: be disposed at the bearing 80 on the rotatable rotating disk (not shown); And the drift (not shown) that can be provided with like that up and down bearing 80.

In the lower end area of drift, combine with drift actuator 20, combine with formpiston head 30 in the bottom of drift actuator 20.In formpiston head 30, form the cooling fluid allocation space 53 of formpiston head 30, can getting off to combine integratedly with formpiston head 30, the formpiston 50 of the forming face 51 that forms with the upper face 12 that has formed flat screen dish 10 combines.

As shown in Figure 3 and Figure 4, in adding in the pressure surface 51 of formpiston 50, form with respect to the horizontal plane (with dashed lines diagram) make progress bend (illustrating) of lateral bending song with solid line.Such bend forms slowly to raise to middle section from end regions, so that after flat screen dish 10 is shaped, can keep its degree of balance in the process of cooling.At this moment, the scope of 0.1mm to 10mm is with respect to the horizontal plane arranged is resultful to the height of bend.

Cooling fluid allocation space 53 forms depression to adding pressure surface 51 after glass blocks be shaped to finish, do not cool off like that and add pressure surface 51 so that the flat screen dish 10 that is shaped is not melted in the forming face 51 of formpiston 50.In addition, in cooling fluid allocation space 53, fluid dispensing components 40 is set, supplies with cooling fluid, be ejected into cooling fluid allocation space 53, make formpiston 50 coolings (with reference to Fig. 2) from formpiston head 30.

In the inboard of fluid dispensing components 40, form from the fluid containment space 41 that upside is subside downwards, the bottom section in fluid containment space 41 forms a plurality of lug bosses 43 that separate predetermined distance mutually side by side, so that combine with formpiston head 30.In the adjacent area of each lug boss 43, run-through board face and form fluid through-hole 45.In the middle section of fluid dispensing components 40, form fluid discharge path 47 to separate with fluid containment space 41, make and discharge the cooling fluid (with reference to Fig. 2) that makes formpiston 50 coolings by fluid through-hole 45.

In the middle section of formpiston head 30, what form cooling fluid returns stream 39, so that be communicated with the fluid discharge path 47 of fluid dispensing components 40 along axis direction, return stream 39 around, a plurality of fluid feed paths 38 of convection cell spatial accommodation 41 being supplied with cooling fluids with return stream 39 configuration (with reference to Fig. 2) radially side by side.

In the upper end of bearing 80, the lower die 70 of the lower surface 13, oblique angle, bottom 18 and side 14 shapings that make flat screen dish 10 is set, at the upside of lower die 70, the metal-back mould 60 that configuration is shaped the upper bevel 16 of flat screen dish 10.Metal-back mould 60 has roughly four square ring shape shapes, is disposed at the upper end of lower die 70 in compression molding equipment selectively.

As shown in Figure 3 and Figure 4, hold the accommodation section of lower die 70 of glass blocks along with there are bottom surface 71 and sidewall 74 in its position.In bottom surface 71, form with respect to the horizontal plane (with dashed lines diagram) make progress bend (illustrating) of lateral bending song with solid line.Such bend forms slowly to raise to middle section from end regions, so that after flat screen dish 10 is shaped, can keep its degree of balance in the process of cooling.At this moment, the scope of 0.1mm to 10mm is with respect to the horizontal plane arranged is resultful to the height of bend.

On the other hand, in Fig. 3 and embodiment shown in Figure 4, the bottom surface 71 that adds pressure surface 51 and lower die 70 of formpiston 50 all forms the bend that is bent upwards.But as shown in Figure 5, only the pressure surface 51 that adds of formpiston 50 forms bend, or as shown in Figure 6, only the bottom surface 71 of lower die 70 forms flexure plane.

In addition, such flexure plane can form when making formpiston 50 and lower die 70, forms but also can process existing formpiston 50 and lower die 70.

By such structure, if drop into glass blocks from glass melting road (not shown) in lower die 70, then formpiston 50 pressurizes to glass blocks to lower die 70 declines.By the pressurization of formpiston 50, the refrigerating work procedure of flat screen dish 10 through stipulating at lower die 70 and metal-back mould 60 internal shapings moves to the such back operation of grinding step.

At this moment, in the bottom surface 71 that adds pressure surface 51 and lower die 70 of formpiston 50, form with respect to the horizontal plane the upwards bend of lateral bending song respectively, so after being shaped, in the lower surface 13 and upper face 12 of flat screen dish 10, as shown in Figure 1, form the flexure plane corresponding with bend.

Such flat screen dish 10 is in the process cooling procedure, the torsion phenomenon of the end regions of flat screen dish 10 with respect to the middle section protuberance takes place in the thermal deformation that produces because of the difference in thickness at each position, but in flat screen dish 10 of the present invention, form the flexure plane that is bent upwards, so such torsion phenomenon is compensated, can keep the degree of balance of flat screen dish 10.

So, according to the present invention, by forming with respect to the horizontal plane the upwards bend of lateral bending song in the bottom surface 71 that adds pressure surface 51 and lower die 70 of formpiston 50 at least one, the bad generation of the flat screen dish 10 that suppresses to be shaped can be kept the degree of balance of flat screen dish 10.

As mentioned above, according to the present invention, can provide the panel screen forming device for CRT of removing torsion phenomenon, raising grinding step efficient, keeping the degree of balance of regulation.

In addition, according to the present invention, can provide the cathode-ray tube flat screen dish of the degree of balance of keeping regulation.

Claims

1, a kind of panel screen forming device for CRT, this device comprises: the lower die that forms the accommodation section that holds glass blocks; But with come with respect to described lower die upper and lower settings being contained in the glass blocks pressurization of described lower die, thereby the formpiston that described flat screen dish is shaped;

It is characterized in that: the bottom surface of described accommodation section and described formpiston add in the pressure surface at least one form with respect to the horizontal plane the upwards bend of lateral bending song.

2, panel screen forming device for CRT as claimed in claim 1 is characterized in that: described bend forms slowly to raise to middle section from end regions.

3, panel screen forming device for CRT as claimed in claim 2 is characterized in that: the height of described bend with respect to the horizontal plane has the scope of 0.1mm to 10mm.

4, a kind of cathode-ray tube flat screen dish is characterized in that: made by the described panel screen forming device for CRT of claim 1, at least one in lower surface and the upper face forms the flexure plane corresponding with described bend.

5, cathode-ray tube flat screen dish as claimed in claim 4 is characterized in that: described flexure plane forms slowly to raise to middle section from end regions.

6, cathode-ray tube flat screen dish as claimed in claim 5, it is characterized in that: the height of described bend with respect to the horizontal plane has the scope of 0.1mm to 10mm.