JPH0249330A - Manufacture of fluorescent character display tube - Google Patents

Abstract

PURPOSE:To enable the use of a less expensive manufacture mold and ensure easy manufacture even in small-lot and large-quantity production by providing piece grids on an anode board after the pre-processing thereof with an NC punch. CONSTITUTION:A sheet-shaped grid 1 is placed on a lower mold 7 and shifted to the position of a projection part 3 and a connection part 4 at the predetermined position within the frame 5 of the sheet-shaped grid 1 by using a special purpose punch 6. Concurrently, the grid 1 is moved up and down and automatically bent for shaping and cut in turn. Each piece grid 2 shaped and cut is adsorbed as a bulk via an electromagnetic force or a vacuum adsorption chuck from the lower mold 7 as it is, and taken out. The bent projection part 3 is placed on a connection pad 10 comprising a conductive paste containing a crystallized glass ingredient preliminarily printed or applied to the predetermined position of an anode board 9, and baked in a baking oven, thereby ensuring electrical and mechanical fixing connection. According the construction, it is possible to cope with the requirement of small-lot and large-quantity production using a less expensive manufacturing mold.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a fluorescent display tube, and more particularly to a method for shaping and cutting a grid placed on an anode substrate.

[Conventional technology]

Conventionally, the sheet grid used in this type of fluorescent display tube is made of a thin sheet of 426 alloy or invar material with a thickness of 50 μm, as shown in FIG. Using techniques such as etching in advance,
A plurality of individual grids 2 corresponding to a required display pattern are mechanically interconnected within a frame 5 via connecting portions 4. At the same time, these sheet-like individual piece grids 2 have an upper mold 15 and a lower mold 16.
After bending and shaping, a protrusion 3 is formed to ensure a gap with the anode substrate.

In order to install these plurality of individual grids 2 at predetermined positions fiK on the anode substrate, a simultaneous shaping/cutting mold is used to electrically and mechanically connect them to one sheet-like grid l. A plurality of individual grid pieces 20 were cut at the connecting portions 4 to separate them from each other, and at the same time a gap of 15'r was maintained between the anode substrate and the grids. The protrusion 3' is bent and shaped using an upper die 15. Thereafter, these multiple individual grids 2 that have been separated and processed from the mold for simultaneous shaping and cutting are taken out all at once using a mounter equipped with electric suction or vacuum suction, and placed in advance at the desired position on the anode substrate. After being mounted onto a connection pad made of conductive paste via the bent and shaped protrusion 3, it is fired and is electrically and mechanically fixedly connected to the anode substrate.

[Problem to be solved by the invention]

However, the above-mentioned conventional method shown in FIG. 4, i.e., simultaneous shaping and cutting, cuts the connecting portions 4 of the grid with the lower die 15 and 16 and simultaneously bends and shapes the protrusions @ 3 to separate individual pieces. In the method of processing into grid 2, the production cost of the simultaneous shaping/cutting mold is high, and especially if it is to be compatible with high-mix, low-volume production, it is necessary to prepare the same number of molds as the types of fluorescent display tubes. This requires a large amount of mold cost, and is a major factor in increasing manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a fluorescent display tube that solves the above-mentioned drawbacks, uses an inexpensive manufacturing mold, and is extremely easy to manufacture even in the production of a wide variety of products in small quantities.

[Means to solve the problem]

The structure of the present invention is a method for manufacturing a fluorescent display tube in which a plurality of individual mesh-like grids are processed in a frame and installed on an anode substrate, and when the individual grids are installed on the anode substrate, The method is characterized in that the individual grid pieces are pre-processed using an NC-controlled punch and then placed on the anode substrate.

〔Example〕

'vcK The present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing a method of shaping and cutting a grid of a fluorescent display tube according to an embodiment of the present invention, and FIG. 2 shows each individual grid after shaping and cutting of the embodiment of FIG. FIG. 3 is a perspective view of the anode substrate after being mounted on the substrate. Here, the cover glass for maintaining vacuum is omitted.

In Figure 1, first look down at the sheet-like grid l'! J7
When the sheet grid 1 is placed on the top and automatically moved to the position of the protrusion 3 and the connecting portion 4 in the frame 5 of the sheet grid 1 using the special punch 6 under the control of the NC control device 8. It is raised and lowered at the same time, and sequentially dynamically folded, shaped, and cut.

In this way, the individual grid pieces 2 that have been shaped and cut are taken out as a whole from above the lower die 7 by being attracted using electromagnetic force or a vacuum suction chuck, as shown in FIGS. 2 and 3. As shown, the bent protrusions 3' are placed on the connection pads 10 on which a conductive paste containing a crystallized glass component is applied in advance by printing or using a dispenser or the like at the required positions on the anode substrate 9. Then, they are fired in a firing furnace and are electrically and mechanically fixedly connected.

A plurality of filaments 12 are stretched on the upper part of the grid via a filament support 11, and a large number of glues 14. Electrode pads 13 are arranged on the anode substrate 9 with a cover glass (not shown).
The whole is vacuum sealed.

In this example, only the lower die 7 is made in line with the shaping/cutting part of the grid 1, and the punch part corresponding to the conventional upper die is NC.
Using an NC control device such as a control drilling machine or NC scribing punch, replace only the punch portion with a dedicated punch 6 suitable for shaping and cutting the grid, and use the NC control device to insert the protrusions 3 and connecting portions of the individual grids. 4, the special punch 6 is automatically moved up and down to bend and shape the protrusions of the individual piece grid 2, and to form the connecting portions 4.
Enables cutting.

〔Effect of the invention〕

As explained above, in the present invention, the conventional simultaneous shaping/cutting mold method using upper and lower molds has a high cost, and especially in the case of high-mix low-volume production, A mold had to be prepared, which increased the mold cost, but K, which supports high-mix, low-volume production, requires only the lower mold to be prepared, which has the effect of significantly reducing mold costs. .

[Brief explanation of the drawing]

FIG. 1 shows grid shaping and manufacturing method according to an embodiment of the present invention.
2 is a perspective view of the grid shown in FIG. 1 after it has been mounted on the anode substrate; FIG. 3 is a perspective view of the protrusion shown in FIG. 4
The figure is a perspective view of a mold showing a grid shaping/cutting method using a conventional upper mold and lower mold method. 1... Sheet-like grid, 9... Anode substrate, 2...
- Individual grid, 10... Connection pad, 3... Projection, 11... Filament support, 4... Connecting part, 12... Filament, 5... Frame, 13.
... Electrode pad, 6... Special punch, 14... Lead, 7... Lower die, 15... Upper die, 8... NO control device, 16... Lower die of conventional system.

Claims (1)

[Claims] In a method for manufacturing a fluorescent display tube in which a grid having a plurality of individual mesh-like grids is processed in a frame and installed on an anode substrate, when the individual grid is installed on the anode substrate, the individual pieces are A method for manufacturing a fluorescent display tube, characterized in that the grid is pre-processed using an NC-controlled punch and then placed on the anode substrate.