CN1387216A

CN1387216A - Panel screen forming device for CRT, and panel screen formed therewith

Info

Publication number: CN1387216A
Application number: CN02120150A
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: KR20020088314A; KR100432768B1

Abstract

The invention provides a CRT flat panel forming apparatus to improve efficiency of grinding process and to prevent distortion of the flat panel, and a CRT flat panel forming apparatus produced without distortion 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, a CRT flat panel forming apparatus comprises a accommodation portion with at least one recess formed along the circumferential direction, at the bottom surface of the accommodation portion.

Description

Panel screen forming device for CRT and with the 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 lower die shape panel screen forming device for CRT and with the cathode-ray tube flat screen dish of its shaping.

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 4, 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 5, 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, through flat screen dish 210 being formed and during the operation cooled off, as shown in phantom in Figure 4 (for convenience of explanation, to illustrate turgidly than actual), because of the end regions that produces flat screen dish 210 torsion phenomenon, so there is problem to the decrease in efficiency of the grinding step of protrusion with respect to the middle section protuberance.

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, improve grinding step efficient.

In addition, the object of the present invention is to provide the cathode-ray tube flat screen dish of making not produce torsion phenomenon.

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: in the backplate surface of described accommodation section, form at least one along peripheral direction and subside portion.

Here, the described portion of subsideing to form continuously along the peripheral direction of described accommodation section be favourable.

On the other hand, according to another field of the present invention, described purpose realizes by cathode-ray tube flat screen dish, it is characterized in that, panel screen forming device for CRT by scheme 1 is made, the lower surface that has the upper face that is shaped by described formpiston and the accommodation section by described lower die to be shaped is along peripheral direction formation and described at least one corresponding protuberance of portion of subsideing of described lower surface.

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 panel screen forming device for CRT of the present invention;

Fig. 3 is the enlarged drawing in Fig. 2 ' A ' zone;

Fig. 4 is the sectional arrangement drawing of existing cathode-ray tube flat screen dish;

Fig. 5 is the part sectional arrangement drawing 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, form in the lower surface 13 along the outstanding protuberance 19 in peripheral direction slave plate surface.Protuberance 19 is subside portion 71 by lower die 70 described later and is formed, and prevents the torsion phenomenon (with reference to Fig. 2) of the end regions of flat screen dish 10 with respect to the middle section protuberance.

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.

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 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 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 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 former to some extent selectively.

As shown in Figure 3, hold the accommodation section of lower die 70 of glass blocks along with there are backplate surface 73 and sidewall 74 in its position.In backplate surface 73, form at least one along peripheral direction and subside portion 71.

Subside portion 71 and preferably form continuously, so that adjacent to the sidewall 74 of lower die 70 along the peripheral directions of lower die 70.But, also can only form the portion 71 of subsideing in the specific region of lower die 70.

As shown in Figure 1, subside portion 71 and make and form protuberance 19 on the lower surface 13 of flat screen dish 10, after being shaped by protuberance 19, make the end regions of flat screen dish 10 thicker than middle section.Therefore, can prevent the torsion phenomenon of the flat screen dish 10 that the cooling rate difference because of middle section and the different heat conduction of end regions causes.

The portion of subsideing 71 like this can form with the portion of subsideing 71 when the manufacturing of lower die 70, also can be by the backplate surface 73 of existing lower die 70 being holed or edm forms.At this moment, the size of subsideing portion 71 can suitably be regulated according to the kind size of the flat screen dish 10 that is shaped, but does not mind its shape.

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 lower die 70, form the portion 71 of subsideing, so on the lower surface 13 of the flat screen dish 10 that passes through formpiston 50 press moldings, form protuberance 19.Therefore, after being shaped, through in the processes of refrigerating work procedure, can prevent that the flat screen dish 10 that cooling rate difference that the different heat conduction of middle section and end regions cause produces from reversing at flat screen dish 10.

As mentioned above, according to the present invention, form at least one by the backplate surface 73 upper edge peripheral directions in the accommodation section of lower die 70 and subside portion, the flat screen dish 10 that can suppress to be shaped takes place bad.

In the above-described embodiments, the portion of subsideing for by forming in lower die forms protuberance in the flat screen dish, prevents that the effect that the flat screen dish reverses from describing in detail.Wherein, after shaping, because the flat screen dish is through the grinding step by abrasive wheel abrasive sheet face, so the protuberance that forms on the flat screen dish is when this grinds, the whole lower surface of flat screen dish does not contact abrasive wheel, so can also obtain to carry out sleekly the additional effect of the grinding of flat screen dish.

As mentioned above, according to the present invention, the panel screen forming device for CRT that can provide and remove torsion phenomenon, improves grinding step efficient.

In addition, according to the present invention, the cathode-ray tube flat screen dish that can provide the phenomenon that do not twist to make.

Claims

1. 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 with respect to described lower die upper and lower settings, thus the formpiston that described flat screen dish is shaped,

It is characterized in that, in the backplate surface of described accommodation section, form at least one along peripheral direction and subside portion.

2. panel screen forming device for CRT as claimed in claim 1 is characterized in that, the described portion of subsideing forms continuously along the peripheral direction of described accommodation section.

3. cathode-ray tube flat screen dish, it is characterized in that, panel screen forming device for CRT by claim 1 is made, the lower surface that has the upper face that is shaped by described formpiston and the accommodation section by described lower die to be shaped is along peripheral direction formation and described at least one corresponding protuberance of portion of subsideing of described lower surface.

4. cathode-ray tube flat screen dish as claimed in claim 3 is characterized in that, the described portion of subsideing forms continuously along the peripheral direction of described accommodation section.