JPH0745222A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To reduce cost by reducing the area of a printed board on which a fluorescent character display tube is installed. CONSTITUTION:A lead 11-a of a right side filament is left as it is, and a lead 11-b of a left side filament is connected to a lead 11-b' of a left side filament just adjacent to the lead 11-a of the right side filament by being introduced by wiring 2 formed on an insulating board. Thereby, since connection between a fluorescent character display tube and an electric power supply transformer can be performed directly on a printed board, the area of the printed board can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a fluorescent display tube.

[0002]

2. Description of the Related Art A conventional fluorescent display tube has a structure as shown in FIGS. That is, the wiring 2 is formed on the insulating substrate by paste containing silver as a main component and screen printing. The insulating layer 3 is formed thereon by screen printing a paste in which a low-melting glass is mixed with a black pigment. Then, a through hole 4 is formed by screen printing a paste containing graphite as a main component. A base electrode 5 is formed thereon by screen printing a paste containing graphite as a main component. The phosphor paste is screen-printed thereon to form the display pattern 6. On top of that, a metal mesh grid 7
By fixing the grid 7 with the fixing material 8 containing silver as a main component, the anode substrate is completed.

A filament 10 attached by a support 9 is attached to this anode substrate by a conventional method. The filament 10 passes through the support 9 and leads 11 of the filament.
It is directly supported by a lead frame on a and 11b.

The grid 7 and the segment (base electrode 5) are connected to the grid terminal 12 and the segment terminal 13 through the wiring 2 on the anode substrate, respectively. A fluorescent display tube is completed by combining the lead frame to which the filament 10 is attached so as to be sandwiched between the anode substrate and the cover glass 14. At this time, the filament lead 11-a on the right side and the filament lead 11-b on the left side are arranged at both ends of the fluorescent display tube.
On the other hand, in the arrangement of the power transformer for applying the voltage to the filament 10, the right side filament and the left side filament are adjacent to each other.

In order to operate the fluorescent display tube, the power supply transformer and the lead 11 of the filament of the fluorescent display tube are connected by wiring on the printed circuit board. At this time, since the grid lead 12 and the segment lead 13 are located between the right-side filament lead 11-a and the left-side filament lead 11-b of the fluorescent display tube, the wiring on the printed circuit board with the power transformer is In the shortest time, it becomes impossible to connect, and the wiring on the printed circuit board becomes complicated. As a result, a large printed circuit board is required.

Particularly, when there are two or more driving units for operating the fluorescent display tube as shown in FIG. 4 and the fluorescent display tube and the printed circuit board are connected by FPC, the filament lead 11 on the right side is used. -A is the FPC 15-a of the drive unit 1.
FPC position 16-a on the right filament connected to
The lead 11-b of the left filament is connected to the FPC 15-b of the drive unit 2 and is led to the FPC position 16-a of the left filament. For this reason, it is necessary to connect the filament 10 of the fluorescent display tube and the power transformer on the printed circuit board so as to avoid between the grid and the segment of the driving unit 1 and between the grid and the segment of the driving unit 2. Since the wiring in the above can not be connected in the shortest, the wiring on the printed circuit board becomes more complicated, and as a result, the area of the printed circuit board needs to be larger.

[0007]

However, in the conventional fluorescent display tube, as described above, the lead of the filament has a structure in which the right side lead and the left side lead are located at the end of the fluorescent display tube respectively. The grid leads and the segment leads are arranged.

On the other hand, a power transformer for applying a voltage to operate the fluorescent display tube has a structure in which the lead of the right filament and the lead of the left filament are immediately adjacent to each other. Therefore, when connecting the conventional fluorescent display tube and the power transformer on the printed circuit board, it is necessary to avoid the wiring of the grid and the segment, the wiring of the printed circuit board becomes complicated, the area of the printed circuit board becomes large, and the cost increases. It had the drawback of being up. If the wiring on the printed circuit board cannot be connected, a metal wire (jumper wire)
It was necessary to connect with, and the cost increased further. Therefore, the present invention makes the lead arrangement of the filament the same as the terminal arrangement of the power transformer,
By arranging the filament lead on the right side and the filament lead on the left side of the fluorescent display tube immediately adjacent to each other, the area of the printed circuit board can be reduced and the cost can be reduced.

[0009]

In order to achieve this object, according to the present invention, the lead of one filament is left as it is and the lead of the other filament is provided by wiring inside the fluorescent display tube or by a lead frame. Placed next to the filament lead.

[0010]

The present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a fluorescent display tube showing a first embodiment of the present invention. The wiring 2 is formed on the insulating substrate 1 by paste containing silver as a main component and screen printing. At that time, from the left side filament pad 17 to the left side of the right side filament lead 11-a, the left side filament lead 11-b (this lead is added to the conventional fluorescent display tube is added. The wiring width is 0.
The wiring 2 of 3 to 0.5 mm is arranged along the outer periphery of the fluorescent display tube so as not to interfere with the wiring (not shown) of other grids or segments. As a result, the left side filament pad 17 and the left side filament lead 11-
b is electrically connected. The insulating layer 3 is formed thereon by screen printing a paste in which a low-melting glass is mixed with a black pigment. Then, a through hole 4 is formed by screen printing a paste containing graphite as a main component. A base electrode 5 is formed thereon by screen printing a paste containing graphite as a main component. The phosphor paste is screen-printed thereon to form the display pattern 6. Further, the metal mesh grid 7 is fixed on the grid 7 with a fixing material 8 containing silver as a main component, whereby the anode substrate is completed.

A filament 10 attached by a support 9 is stretched above the anode substrate. The left side portion is directly (mechanically) connected to a lead frame integrated with the filament lead 11-a, and the left side portion is provided with a claw 18 extending from the lead frame integrated with the left filament lead 11-b. Left filament pad 1
7 is contacted and connected, and the lead 1 of the filament on the right side
1-a lead 11 on the left side of the filament next to the left
It is electrically connected to b '.

Incidentally, the lead 11- of the left filament
In addition to b ', it is directly (mechanically) connected to the leftmost end of the fluorescent display tube with a lead frame integrated with the lead 11-b of the left filament. (The total number of leads of the filament on the left side is two.) In addition, this lead frame is formed into an arbitrary shape at the stage of parts by etching a metal alloy or pressing it with a die. In this Example 1, the lead 11-b of the leftmost filament at the left end of the fluorescent display tube is projected, but depending on the case, 1.0 to 1.5 mm from the glass surface of the fluorescent display tube (A- in the figure).
It may be cut with a cutting die or scissors at about A ').

The grid 7 and the segment (base electrode 5) are connected to the grid terminal 12 and the segment terminal 13 through the wiring 2 on the anode substrate, respectively. A fluorescent display tube is completed by combining the lead frame to which the filament 10 is attached so as to be sandwiched between the anode substrate and the cover glass 14. This makes the lead arrangement of the fluorescent display tube and the lead arrangement of the power transformer the same, eliminating the need to avoid wiring the grid and segments when connecting the fluorescent display tube and the power transformer on the printed circuit board. The lead 11-a can be directly connected to one output lead to the filament of the power transformer, and the lead 11-b 'of the left filament can be directly connected to the other output lead to the filament of the power transformer.

FIG. 2 is a plan view of a fluorescent display tube showing a second embodiment of the present invention. The anode substrate including the wiring 2 is manufactured by the same method as the conventional fluorescent display tube. A filament 10 attached by a support 9 is stretched above the anode substrate. The filament 10 is directly (mechanically) connected to the lead frame integrated with the right filament lead 11-a through the support 9, and the left side portion is connected to the left filament lead 11-b. A lead frame 18 integrated with the above is directly connected from the left end to the lead 11-b 'of the left filament installed next to the lead 11-a of the right filament. This lead frame is formed into a desired shape at the stage of parts by etching a metal alloy or pressing it with a die.

The grid 7 and the segment (base electrode 5) are connected to the grid terminal 12 and the segment terminal 13 through the wiring 2 on the anode substrate, respectively. A fluorescent display tube is completed by combining the lead frame to which the filament 10 is attached so as to be sandwiched between the anode substrate and the cover glass 14. The drive unit 1 can be attached to the Eid of this fluorescent display tube by hand or by soldering with an automatic device.
The FPC 15-a and the FPC 15-b of the drive unit 2 are attached, and the fluorescent display tube and the printed circuit board are connected by the FPC. In this case, the filament arrangement is FPC1 of the driving unit 1.
FPC position 16 of the right filament on the right side of 5-a
-FPC position 16 on the left side of the filament just next to -a
There will be -b. As a result, the lead arrangement of the fluorescent display tube and the lead arrangement of the power transformer become the same, and when connecting the fluorescent display tube and the power transformer on the printed circuit board, it is not necessary to avoid the wiring of the grid and the segment, Position of lead FPC 16-
a is to one output lead to the filament of the power transformer and the position 16-b of the FPC of the lead of the left filament
Allows direct connection to the other output lead to the filament of the power transformer.

[0017]

As described above, according to the present invention, the lead arrangement of the filaments of the fluorescent display tube is arranged adjacent to each other so that the lead arrangement of the fluorescent display tube and the lead arrangement of the power transformer are the same. Therefore, when connecting the fluorescent display tube and the power transformer on the printed circuit board, it is not necessary to avoid the wiring of the grid and the segment. This allows the right-hand filament lead to be directly connected to one output lead to the power transformer filament, and the left-hand filament lead to be directly connected to the other output lead to the power transformer filament. The area can be reduced and the cost can be reduced.

The same applies to the case where there are two or more driving circuits for operating the fluorescent display tube and an FPC is attached.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing an example of a conventional fluorescent display tube.

FIG. 4 is a plan view showing another example of a conventional fluorescent display tube.

FIG. 5 is a cross-sectional view showing an anode substrate of a fluorescent display tube.

FIG. 6 is a perspective view showing the entire fluorescent display tube.

[Explanation of symbols]

 1 Insulating Substrate 2 Wiring 3 Insulating Layer 4 Through Hole 5 Base Electrode 6 Display Pattern 7 Grid 8 Fixing Material 9 Support 10 Filament 11-a Right Filament Lead 11-b Left Filament Lead 12 Grid Lead 13 Segment Lead 14 Cover glass 15-a FPC of drive unit 15-b FPC of drive unit 2 16-a FPC position of right filament 16-b FPC position of left filament 17 Pad of left filament 18 Claw

Claims (3)

[Claims] 1. A terminal electrically connected to a plurality of anodes coated with a phosphor in a specific pattern on an insulating substrate, and a pair of terminals electrically connected to a filament that emits electrons. In a fluorescent display tube in which a terminal electrically connected to a lid for controlling and accelerating electrons is led out of a vacuum envelope, a pair of terminals connected to the filament are arranged at adjacent positions. Fluorescent display tube characterized by. 2. The fluorescent display tube according to claim 1, wherein one of a pair of terminals connected to the filament is connected to the filament through a wiring formed on a substrate. 3. The filament is supported by a lead frame and is electrically connected to one of a pair of terminals connected to the filament by utilizing a part of the lead frame. Item 1. A fluorescent display tube according to item 1.