JP2843723B2 - Connection structure between fluorescent display tube and printed circuit board using flexible printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a display component and a control printed board, and more particularly to a flexible printed board suitable for connecting a fluorescent display tube and a plurality of control printed boards using the flexible printed board. The present invention relates to a connection structure between a fluorescent display tube and a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 2 and 3, as a connection structure for connecting two control printed circuit boards in order to display two systems on a fluorescent display tube (FL).

FIG. 2 is a wiring diagram showing a state in which a fluorescent display tube and a filament circuit pattern of two control printed circuit boards are connected by a connector, and FIG. 3 is a printed circuit board on which the fluorescent display tube is mounted and two control printed circuits. It is a wiring diagram showing the state where boards were connected by a parallel wire.

[0004] Using a fluorescent display tube 1, which is widely used as a display device of electronic equipment, for example, a cassette deck (D)
ECK) and a compact disc player (CD) are displayed on the existing first printed circuit board 3 for control.
When using the second printed circuit board 4 and the connection structure using the flexible printed circuit board 2, as shown in FIG. 2, the first conductive patterns 2a, 2a,.
Are connected to the filament terminals 1a, 1a and the other terminals 1b, 1b... Disposed at both ends of the fluorescent display tube 1, and the control IC 5 and the filament circuit 3a of the cassette deck display are disposed at the other end. Are connected to the conductive pattern 3c for the filament circuit and the conductive patterns 3b, 3b,. And conductive pattern 4
a, 4a...

The other end of the conductive pattern 4c is connected to a first circuit by a connector 11 together with a signal circuit (not shown).
The filament was connected to the conductive pattern 3e of the printed circuit board 3, and the filament was driven by the filament circuit 3a.

In the connection structure using the parallel wires 16 and 17 with connectors without using the flexible printed circuit board 2, FIG.
As shown in the figure, the connector 16b of the parallel wire 16 is connected to the connector 12c for the cassette deck display of the printed circuit board 12 on which the fluorescent display tube 1 is mounted, and the parallel wire 17 is connected to the connector 12d for the compact disc player display. Connector 17b.

The conductive patterns 12b, 12b connected to the filament terminals 1a, 1a arranged at both ends of the fluorescent display tube 1 are connected to predetermined terminals of a connector 12d by jumper wires 13.

Then, the connector 16b at the other end of the parallel wire 16 is connected to the connector 19b of the printed circuit board 19 for controlling the cassette deck display unit, and the connector 17b of the parallel wire 17 is connected to the display unit for controlling the compact disc player. It was connected to the connector 20b of the printed circuit board 20.

Here, 12a, 19a and 20a are all conductive patterns. The signal circuits of the printed circuit board 19 and the printed circuit board 20 were connected by the connector 7 such as a wire harness.

[0010]

However, a fluorescent display tube using the above-mentioned conventional flexible printed circuit board,
In the connection structure with one printed circuit board, the filament terminals arranged at both ends of the fluorescent display tube are connected to the filament circuit formed on one printed circuit board.
As shown in (1), both printed circuit boards have to be connected by a connector in which a filament circuit is added to a signal circuit, and the component cost is high.

In addition, if a new printed circuit board is integrated into one and a conductive pattern is connected, a connector becomes unnecessary, but the printed circuit board is dedicated and cannot be used in common with other models. There is a problem that the component cost of the printed circuit board is increased.

As shown in FIG. 3, a fluorescent display tube is mounted on a printed circuit board, and the printed circuit board and both printed circuit boards are connected by a parallel wire with a connector. When disposed on a tray panel, there is a drawback that the tray panel becomes thicker due to the printed circuit board on which the fluorescent display tubes are mounted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the drawbacks of the prior art and to use a filament terminal of a fluorescent display tube and two control terminals without using connectors or parallel wires. An object of the present invention is to provide a connection structure between a fluorescent display tube and a printed board by a flexible printed board for connecting the printed board.

[0014]

SUMMARY OF THE INVENTION According to the present invention, there is provided a connection structure between a fluorescent display tube and a printed circuit board using a flexible printed circuit board, wherein a plurality of terminals are arranged in rows and a fluorescent display tube having filament terminals at both ends thereof. A first printed circuit board having a filament circuit and a display control element, and a second printed circuit board having a filament relay circuit and a display control element, so as to display two systems on a fluorescent display tube. A flexible printed circuit board provided with a first conductive pattern extending from one end to the other end and a second conductive pattern making a U-turn from the other end and returning to the other end, wherein the first conductive pattern of the flexible printed board is provided. One filament terminal of the fluorescent display tube, the filament circuit of the first printed circuit board, and the other filament via the pattern And the relay circuit of the second printed circuit board are connected to each other, and the filament circuit of the first printed circuit board and the relay circuit of the second printed circuit board are connected by the second conductive pattern to connect the two filament terminals. It is what was constituted.

[0015]

According to the present invention, the first conductive pattern extending from one end to the other end of the flexible printed board and the first conductive pattern extending from the other end to the
Since the second conductive pattern which turns and returns to the other end is provided, one filament terminal of the fluorescent display tube and the filament circuit of the first printed board are connected via the first conductive pattern of the flexible printed board. By connecting the other filament terminal and the relay circuit of the second printed board, respectively, and connecting the filament circuit of the first printed board and the relay circuit of the second printed board by the second conductive pattern, The two filament terminals are connected, and the filament of the fluorescent display tube is driven.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a connection structure between a fluorescent display tube and a printed circuit board using a flexible substrate according to the present invention will be described with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a wiring diagram showing a state in which a fluorescent display tube and a filament circuit pattern of two control printed boards are connected by a conductive pattern of a flexible printed board.

In FIG. 1, reference numeral 2a denotes a first conductive pattern, which is formed from one end of the flexible printed board 2 to the other end. 2b is a second conductive pattern,
It is formed so as to be emitted from the other end of the flexible printed circuit board 2 and return to the original other end.

Reference numeral 3 denotes a first printed circuit board for controlling an existing cassette deck display unit, and a control IC 5 for controlling the fluorescent display tube 1.
Are mounted, and a filament circuit 3a for driving the filament is formed. The two conductive patterns 3c and 3d connected to the filament circuit 3a and the control I
A conductive pattern 3b leading to C5 is formed.

Reference numeral 4 denotes an existing second printed circuit board for controlling the display section of the compact disk player, on which the control IC 6 of the fluorescent display tube 1 is mounted, and which forms a conductive pattern 4a and a filament relay circuit connected to the IC 6. Conductive pattern 4b is formed.

The fluorescent display tube 1, which is often used as a display device of an electronic apparatus, divides a display section into two systems, for example, a cassette deck and a compact disc player, and displays the existing first and second printed circuit boards 3. , 4, the first end of the flexible printed circuit board 2
Are connected to the filament terminals 1a, 1a and the other terminals 1b, 1b arranged at both ends of the terminals of the fluorescent display tube 1.

Next, the conductive pattern 3c of the first printed circuit board 3 and the first filament terminal 1a connected to the leftmost filament terminal 1a are connected.
The other end of the conductive pattern 2a is connected to another conductive pattern 3
are connected to predetermined first conductive patterns 2a.

The filament conductive pattern 4b of the second printed circuit board 4 is connected to the other end of the first conductive pattern 2a connected to the filament terminal 1a on the right end, and the other conductive patterns 4a, 4a. First conductive pattern 2
Connect a.

Then, the left end of the second conductive pattern 2b of the flexible printed board 2 is connected to the conductive pattern 3d of the first printed board 3, and the right end is connected to the conductive pattern 4b of the second printed board 4.

As a result, the filament terminal 1a disposed on the left end of the fluorescent display tube 1 and the filament terminal 1a disposed on the right end are electrically connected and driven by the filament circuit 3a.

The signal circuits on the first printed circuit board 3 and the second printed circuit board 4 are connected by a connector 7 such as a wire harness.

In this embodiment, the fluorescent display tube 1 displays two systems. However, the present invention is not limited to this. By adding a conductive pattern similar to the second conductive pattern 2b to the flexible printed circuit board 2, it is possible to cope with this. By connecting the printed circuit board for control, three or more systems can be displayed.

[0028]

According to the connection structure between the fluorescent display tube and the printed circuit board using the flexible printed circuit board according to the present invention, one control panel 1 is used for two control operations.
When two systems are displayed by using the printed circuit boards 3 and 4, the connection circuit of the filament terminals 1a disposed at both ends of the fluorescent display tube 1 includes the first and second printed circuit boards 3 and 4.
By connecting the filament conductive patterns 3d and 4b with the second conductive pattern 2b formed on the flexible printed circuit board 2. Therefore, an existing signal circuit connector may be used as the connector, and the cost can be reduced.

Further, even if the fluorescent display tube 1 is arranged on the tray panel of a compact disc player, the thickness of the tray panel can be reduced, so that the player can be downsized and the design is beautiful.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing a connection structure between a fluorescent display tube and a printed circuit board using a flexible printed circuit board of the present invention.

FIG. 2 is a connection diagram showing a connection structure between a fluorescent display tube and a printed circuit board using a conventional flexible printed circuit board.

FIG. 3 is a connection diagram showing a connection structure between a fluorescent display tube using a parallel wire and a printed circuit board.

[Explanation of symbols]

 Reference Signs List 1 fluorescent display tube 1a filament terminal 1b terminal 2 flexible printed circuit board 2a first conductive pattern 2b second conductive pattern 3 first printed circuit board 3a filament circuit 3b, 3c, 3d, 4a, 4b conductive pattern 4 second printed circuit board 5, 6 Control IC 7 connector

Claims (1)

(57) [Claims] 1. A fluorescent display tube having a plurality of terminals arranged in rows and having filament terminals at both ends thereof, a first printed circuit board having a filament circuit and a display control element, and a filament relay circuit. And a second printed circuit board having a display control element,
In a display device configured to perform system display, a flexible printed circuit board including a first conductive pattern extending from one end to the other end and a second conductive pattern making a U-turn from the other end and returning to the other end is provided. One filament terminal of the fluorescent display tube is connected to the filament circuit of the first printed board via the first conductive pattern of the flexible printed board, and the other filament terminal is connected to the relay circuit of the second printed board. And connecting the filament circuit of the first printed circuit board and the filament relay circuit of the second printed circuit board with the second conductive pattern to connect the two filament terminals of the fluorescent display tube. Connection structure between fluorescent display tube and printed circuit board by flexible printed circuit board.