JPS60198043A - Fluorescent display tube - Google Patents

Abstract

PURPOSE:To simplify the connection of electrode terminals formed on the anode base plate to lead frames during assembly of a fluorescent display tube by using a resin-hardened conductive paste as a bonding material. CONSTITUTION:An anode base plate 2 containing a phosphor layer 1 for display patterns, a filament 4 and a control grid 5 are sealed inside a glass cover 3. Then lead frames 6 for applying voltage are connected to the thus formed body, thereby assembling a fluorescent display tube. The above connection is performed by holding an end surface of the anode base plate 2 with the lead frames 6 and then applying a resin-hardened conductive copper paste 9 to the end surface before performing hardening in a drying furnace prior to applying an overcoat material to the thus treated end surface. By the means mentioned above, manufacturing of a fluorescent display tube is simplified by eliminating the necessity of manual soldering. Furthermore, it is possible to automate the connection process.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Description of the field to which the invention pertains The present invention relates to a connection structure for an external lead frame for voltage application of filaments, grids, electrodes, and phosphor layers of a fluorescent display tube.

(2) Description of the prior art As shown in FIG. 1, a conventional fluorescent display tube is constructed by sealing an anode substrate 2 containing a phosphor layer 1 forming a display pattern with a cover glass 3, and An airtight container is formed, a filament 4 serving as an electron radiation source, and a current control grid 5 are arranged inside the vacuum-tight container, and a phosphor layer 1. ,,． 1. :,
The structure included a filament 4, a current control grid, and an external lead frame 6 for applying voltage and pressure to the dome 5.

In particular, the external lead frame 6 is shown in FIG.
The thin film or thick film wiring 7 formed on the anode substrate 2 was drawn out to the outside of the cover glass 3 to form a terminal, and an external lead frame 6 was connected to this with solder 8.

The aforementioned lead connection is drawn out from the edge of the vacuum-tight container anode substrate 2 made of glass parts, so it is weak in heat resistance in high-temperature processes, and furthermore, the glass cracks and peels due to rapid heating and cooling, which can lead to large thermal shocks. Automation has been difficult because dip soldering or reflow soldering is impossible.

For this reason, soldering was performed manually using a soldering iron with a small thermal shock, which required a large number of man-hours.

Furthermore, as shown in Figure 3+8) to (i), the general process of soldering work consists of 9 steps including soldering and the process of applying reinforcing overcoat material, and this work requires a lot of time and effort. was needed.

This has been a major obstacle to reducing the manufacturing cost of fluorescent display tubes.

(3) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention uses an external lead frame 6 to sandwich the electrode terminals together with the end face of the anode substrate 2 and connect them with a resin-curing conductive paste. A detailed explanation will be given below with reference to FIGS. 4' and 5.

(4) Description of structure and operation of the invention As shown in FIGS. 4 and 5 (R) to (f), the end surfaces of the anode substrate 2 are sandwiched together by an external lead frame 6 for voltage application, and the resin is cured. The conductive copper paste 9 of the mold is continuously and automatically applied using a dispenser-type automatic applicator, and then heated in a drying oven at a temperature of 150°C for 1 hour to dry and harden the resin. Multiple connections are made by curing the conductive copper paste 9 of the mold.

Next, a reinforcing overcoat material of the resin-curing conductive steel paste 9 is applied using a dispenser, and the overcoat material is heated to 140 DEG C. f 0.5 R to harden.

Next, the external lead frame 6 is cut to a predetermined length to complete the installation.

By attaching the external pull-out lead frame 6 using the above method, one bow of manual soldering is removed, and furthermore, the process of applying flux necessary for this soldering process and removing the flux after soldering is eliminated. The three chemical processing steps of Triclean degreasing and alcohol cleaning can also be eliminated.

It is clear that the invention is not limited by varying the minutes.

(5) Description of Effects As explained above, according to the present invention, the t-pole terminal is sandwiched between the external lead frame 6 and the end surface of the anode substrate 2, and connected with the resin-curing conductive paste 9. This automates the connection work and simplifies the work.

For this reason, the manufacturing process is greatly shortened, and the economic effect is significant.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective structural view of a conventional fluorescent display tube. Second
The figure is a partially enlarged perspective structural view of a conventional external drawer IJ-1-' frame. FIGS. 3(a) to 3(i) are flowcharts showing the work of connecting multiple external drawer lead claims by soldering. FIG. 4 is a partially enlarged perspective structural view of the external lead frame according to the present invention. Figures 5(a) to (f)
) is a flowchart showing the process of connecting external lead frames according to the present invention with resin-curing paste and adhesive paste. 1... Fluorescent layer, 2... Anode substrate, 3
・Old...cover glass, 4...filament,
5... Grid for current control, 6... External lead frame, 7... Anode board internal wiring, 8... Solder, 9...・Resin-cured conductive copper paste. Calculation: 2 flashes: 3 m Procedural amendment (method) % formula % Title of the invention Relationship to the case of a person who corrects a fluorescent display tube 1 Applicant: 12699 Ohnohara-cho, Izumi City, Kagoshima Prefecture Representative of Kagoshima NEC Co., Ltd. Cauldron 4th Department Agent Sumitomo Mita Building, 37-8 Shiba 5-chome, Minato-ku, Tokyo 108 Telephone: Tokyo (03) 456-3111 (Main Representative')'-
゛' (Contact information: NEC Corporation Patent Department) 6. Drawing subject to amendment 2 Contents of amendment (Fig. 11m3 and Fig. 5 are replaced with attached drawings.\1-+ Kaya 3 Fig.

Claims (1)

[Claims] In fluorescent display tubes in which filament, grid, and anode signals are extracted to the outside through wiring on the anode substrate, a resin-curing conductive paste is used to connect the electrode terminal formed on the anode substrate to the external lead frame. A fluorescent display tube characterized in that it uses as a bonding material.