JPH0725556U - Display tube with cable - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fluorescent display tube with a cable, which is excellent in the mountability of the cable to a mounting portion such as a PCB. [Structure] Flexible cable 3 connected to fluorescent display tube 2
Is a plurality of core wires 4 covered with a flexible covering material 5 having an insulating property up to the tip. Two cutting lines 6 and 6 which are orthogonal to the longitudinal direction of the core wire are formed at predetermined intervals in the vicinity of the tip of the covering material on both front and back surfaces thereof.
If the coating material is cut into strips on both of the cut lines and removed, a part of each core wire is exposed near the tip of the cable. The exposed connecting part of the core wire was protected by the covering material, so it was not deformed or rusted. Easy to connect to the PCB connection.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display tube with a cable in which internal electrodes and the like are led out by a flexible cable. Hereinafter, the present invention will be described with respect to a fluorescent display tube.

[0002]

[Prior art]

 FIG. 4 shows a conventional fluorescent display tube 100 with a cable mounted on a PCB 101 (printed wiring board). The conventional fluorescent display tube 100 with a cable has a structure in which electrodes and the like in the envelope 105 are led to the outside by a flexible cable 104 having a plurality of core wires 103 covered with a covering material 102. . Each core wire 103 exposed from the covering material 102 at the tip of the cable 104 is inserted into each of a plurality of through holes 106 provided in the PCB 101, and fixed and connected by soldering.

[0003]

[Problems to be solved by the device]

 The cable 104 of the above-described fluorescent display tube with cable 100 was easy to be deformed because the core wire 103 was thin because the pitch was reduced for the purpose of providing flexibility and for increasing the density. For this reason, at the tip of the cable 104, the tips of the core wires 103 that are exposed from the covering material 102 and arranged side by side are likely to be deformed and become uneven, which hinders the mountability to a PCB or the like. That is, it becomes difficult to insert each core wire 103 into a large number of through holes 106 formed in the PCB 101, or even in the case of surface mounting in which each core wire 103 is directly connected to the connection portion provided on the front surface of the PCB 101. Due to the deformation of the tip, there is a problem that the tip is not located on a predetermined terminal portion and it becomes impossible to deal with it.

In addition, the tip of each core wire 103 exposed from the covering material 102 at the tip of the cable 104 is apt to rust, and therefore the relevant portion of the conventional cable 104 is nickel-plated. However, there was a problem that rusting could not be completely prevented even by plating. Also, a flux is required to solder the plated core wire, which later causes the metal to rust. For this reason, there is a problem that the flux must be removed after connection and that an organic solvent such as trichlorethylene must be used for removal.

An object of the present invention is to provide a display tube with a cable, which is excellent in the mountability of the cable to a mounting portion such as a PCB.

[0006]

[Means for Solving the Problems]

 The display tube with a cable according to claim 1 is a display tube with a cable in which a flexible cable having a plurality of core wires covered with a covering material is connected to a fluorescent display tube. It is characterized in that a part of the intermediate portion of the covering material can be removed to expose the intermediate portion.

A display tube with a cable according to a second aspect is the display tube with a cable according to the first aspect, wherein the exposed portion of the core wire is a soldered portion.

The display tube with a cable according to a third aspect of the present invention is the display tube with a cable according to the second aspect, characterized in that the exposed portion of the core wire is bent to be doubled to form a soldered portion. .

[0009]

[Action]

 To connect the cable of the cable-equipped display tube, a part of the middle part of the covering material of the cable is removed to expose the core wire. Since the exposed core wires are aligned at a predetermined interval and are not rusted, they can be easily and reliably soldered to a connection target such as a PCB.

[0010]

EXAMPLE A fluorescent display tube with a cable 1 according to the present embodiment shown in FIG. 1 is connected to a fluorescent display tube 2 and electrodes inside the envelope of the fluorescent display tube 2 and led out of the envelope. And a flexible cable 3 that has been set.

The cable 3 is formed by covering a plurality of core wires 4 arranged in parallel with each other with a flexible covering material 5 having an insulating property. Each core wire 4 is covered with the covering material 5 up to the tip end, and does not protrude to the outside of the covering material 5. In the vicinity of the tip of the covering material 5, two cutting lines 6 and 6 which are orthogonal to the longitudinal direction of the core wire are formed on both the front and back surfaces thereof at a predetermined interval. The cutoff line 6 in this embodiment is a perforation which is composed of a large number of holes formed at predetermined intervals.

As shown in FIG. 1 (a), if the coating material 5 is cut and removed in strips on both cut lines 6 and 6, each core wire 4 is removed near the tip of the cable 3 as shown in FIG. 1 (b). Part of can be exposed.

To mount the fluorescent display tube with cable 1 of this embodiment on a PCB or the like, as described above, a part of the covering material 5 is removed from the cut line 6 to expose the core wire 4. Since the exposed core wire 4 was covered with the covering material 5 until it was subjected to the connecting work, it did not rust even if it was not plated for rust prevention. Moreover, it has not been deformed.

Next, prior to the connection, the coating materials 5 remaining on both sides of the exposed core wire 4 are pulled in opposite directions to make the pitch of the exposed core wire 4 uniform. Even if each core wire 4 is deformed to some extent, this operation corrects each core wire 4 into a straight shape, and the intervals between the core wires 4 1 and 4 are constant.

Next, when the exposed core wires are directly mounted on the connection portion on the front surface of the PCB, as shown in FIG. 2A, the core wire 4 is attached to the connection portion 9 of the PCB 8 using the jig 7. Heat while pressing, and add solder for connection separately to connect. The tip portion of the cable 3 ahead of the connection portion may be removed after the connection. The tip may be fixed on the PCB with double-sided tape or the like. The fluorescent display tube 2 is fixed on the PCB 8 or another substrate. Alternatively, as shown in FIG. 2B, the exposed intermediate core wire may be double-folded and soldered to the connection portion on the substrate.

When the cable 3 of the fluorescent display tube with cable 1 is connected to the through hole 12 of the PCB 11, as shown in FIG. 3, each core wire 4 is handled by bending it using a jig 10. Each core wire 4 is connected to each through hole 12 by inserting it into each through hole 12 and simultaneously adding solder for connection while heating it. The tip of the core wire 4 protruding from each through hole 12 may be removed after the connection. The bent core wire has a rounded tip, and since it is a double wire, it has mechanical strength and can be easily inserted into the through hole 12 without any preliminary solder.

In the embodiment described above, the covering material in the vicinity of the tip of the cable is configured to be removed except for the tip portion of the covering material. However, the tip of the covering material may be removed and the tip of the core wire may be exposed and used for connection.

Further, the structure for removing the covering material is not limited to the cut line as in the above-mentioned embodiment, but the covering material may be divided into two parts, a remaining part and a removing part.

[0019]

[Effect of device]

 According to the display tube with a cable of the present invention, since the core wire is not exposed at the tip of the cable, it is not necessary to spend the labor for evenly aligning the exposed end portions of the core wires at predetermined intervals. It can be mounted on the surface at any time and can be easily inserted into the through hole. Also, since the cable is doubled and soldered on the board or in the through hole, the joint strength is increased and the mechanical strength is also increased.

Since the connecting portion of each core wire is covered with the covering material until it is connected, it is hard to be touched by air and rust resistant. Therefore, nickel plating may be unnecessary depending on the usage conditions, and flux may not be needed during soldering. Alternatively, the nickel plating can be made thinner.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a view showing a case where each core wire is mounted on a surface of a substrate according to an embodiment of the present invention.

FIG. 3 is a view showing a case where each core wire is connected to a through hole of a substrate according to an embodiment of the present invention.

FIG. 4 is a diagram showing a case where a conventional fluorescent display tube with a cable is mounted in a through hole of a substrate.

[Explanation of symbols]

 1 Fluorescent display tube with cable 2 Fluorescent display tube as a display tube 3 Cable 4 Core wire 5 Covering material

Claims (3)

[Scope of utility model registration request] 1. A display tube with a cable in which a flexible cable having a plurality of core wires covered with a covering material is connected to a fluorescent display tube, wherein the covering is provided to expose an intermediate portion of the covered core wires. A display tube with a cable, characterized in that a part of an intermediate portion of the material can be removed. 2. The display tube with cable according to claim 1, wherein the exposed portion of the core wire is a soldered portion. 3. The display tube with a cable according to claim 2, wherein the exposed portion of the core wire is bent and doubled to form a soldered portion.