JPH0338867Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connection structure for a watertight container housing a mounting board on which electrical components are mounted.

[Conventional technology]

When using a watertight container containing a mounted board with electronic components underwater, it is necessary to protect the mounted board inside from external pressure such as water pressure. This is an important point.

A conventional example will be explained below with reference to the drawings. FIG. 4 is a sectional view, and FIG. 5 is a side view. In the figures, 1 is a cylindrical casing, and 2 is a mounting board housed in this cylindrical casing, on which electronic components are mounted. Reference numeral 3 denotes an end plate that closes the end of the cylindrical housing 2 in a watertight state; 4 denotes a water pressure-resistant connection terminal for extracting electrical signals from the mounting board 2 housed inside to the outside through the end plate 3; and 5 is the lead wire.

The end plate 3 is bonded with an adhesive or the like to seal the inside of the cylindrical housing 1 and to withstand water pressure for a long period of time, and the connection terminal 4 is also bonded with an adhesive or the like so that it can withstand water pressure for a long period of time. It is becoming more and more popular.

[Problem that the invention attempts to solve]

As described above, a watertight container is used in an environment where water pressure is applied, and when the connection terminal portion thereof is used as an electric signal line to which a relatively high voltage is applied, a glass connection terminal is usually used. These glass connection terminals require a large amount of space, and as the number of terminals increases, the end plate must be made larger.As a result, a cylindrical housing with an inner diameter larger than that necessary to accommodate the mounting board is inevitably required. As a result, there was a problem of increasing the size of the whole.

Furthermore, depending on the soldering method, the glass connection terminal may crack due to the heat generated during soldering, thereby destroying the watertight structure.

In addition, electrical connections between the terminals on the mounting board and the glass connection terminals are made by soldering using lead wires, but as the number of terminals and connection points increases, this also reduces reliability. There was a problem that caused a decline in

[Means for solving problems]

The present invention provides an end plate to be fitted into a cylindrical housing, which has a recess on the outside and a tapered slit in the middle.A flat cable with insulated conductors is inserted into this slit, and the recess and It is characterized by filling and solidifying the inside of the taper with liquid resin.

[Effect]

According to the above configuration, after the flat cable is inserted into the slit and the wiring is connected to the mounting board housed inside the cylindrical case, the flat cable and the end plate are bonded together to withstand water pressure. By filling the recess with a good liquid resin and solidifying it, and then fixing both ends of the cylindrical case and the end plate with adhesive, we have created a connection structure for a watertight container that is compact and highly resistant to water pressure even with a large number of terminals. can do.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a sectional view, Figure 2 is a side view, and Figure 3 is a plan view of the flat cable.
7 is a cylindrical casing, and 7 is a mounting board housed within the cylindrical casing 6, on which electronic components are mounted. Reference numeral 8 denotes an end plate that closes both sides of the cylindrical case 6, and is made of a structural material that can withstand water pressure, such as a plastic composite material or metal. A recess 10 is formed on the outside of the center side of this edge 9. A slit 11 is provided approximately in the center of this recess 10, and this slit 1
A taper 12 is formed on the outer periphery of 1 toward the outside.

Reference numeral 13 denotes a flat cable for taking out electrical signals to the outside through this slit 11. This flat cable 13 is a flat cable whose conductors are covered with a watertight insulating layer, and is wire-connected to the mounting board 7 in advance.

In such a configuration, in order to withstand water pressure, a liquid resin 14 having good adhesion to the flat cable 13 and the end plate 8 is filled into the taper 12 around the recess 10 and the slit 11 and solidified.

Furthermore, the end portion of the cylindrical housing 6 and the end face plate 8 are fixed together with a resin adhesive 15 to make the entire structure resistant to water pressure.

The flat cable 13 has conductors 16 arranged at equally spaced pitches and is protected by a plastic insulating material 17.

[Effect of idea]

According to the present invention described in detail above, the end plate has a concave portion and an outward taper around the slit, so that when water pressure is applied from the outside in water, the filled and solidified resin will cause the flat cable to collapse. By tightening it further, even more watertightness can be maintained. Furthermore, flat cables have the effect of reducing surface pressure compared to conventional cables because of their thinner plates, and also allow for surface contact with the mounting board, making assembly easier and reducing miswiring. have an effect.

In addition, by using a flat cable, it is possible to connect directly to the mounting board, which eliminates the need for connection terminals on the end plate that were previously required, and the shape of the end plate is small regardless of the number of signal lines taken out to the outside. As a result, the watertight container itself can be made smaller, and even if the number of signal lines increases, it can be easily passed through by arranging them in parallel or curling them.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
3 is a plan view of the flat cable, FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a side view. 6... Cylindrical housing, 7... Mounting board, 8... End plate, 9... Edge, 10... Recess, 11... Slit, 12... Taper, 13... Flat cable, 14... liquid resin.

Claims (1)

[Scope of utility model registration request] In a connection structure for a watertight container, an end plate is fixed to both sides of a cylindrical case housing a mounting board with electronic components mounted thereon, and a communication line for extracting electrical signals to the outside is led out through a hole drilled in the end plate. An edge is provided on the outer periphery of the face plate that comes into contact with the end of the cylindrical casing, a recess is formed in the center of this edge, a slit is provided in the middle of this recess, and a taper is formed around the outside of the slit. A connection structure for a watertight container, characterized in that resin is filled into the recess and taper through a flat cable and solidified.