JPH0519990Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a small electronic device that is equipped with screw terminals for external line connection and that houses a printed wiring board on which electronic components are mounted in an insulating container.

[Conventional technology]

As this type of electronic device, for example, one whose exploded perspective view is shown in FIG. 3 is known. In the figure, the electronic device includes a terminal block 4 made of synthetic resin molding in which a plurality of screw terminals 3 made up of screws 1 and terminal fittings 2 for external line connection are disposed, and an opening that can be fitted and connected to the back side of the terminal block 4. A synthetic resin molded case 5 is formed into a rectangular shape with a deep bottom, and lead wires 6a, 6b, 6c from the electronic circuit 6 are guided by guide grooves 5a, 5a provided in the inner wall of the case 5.
It is composed of a printed wiring board 7 derived from
The lead wires 6a, 6b, 6c, .

[Problem that the invention attempts to solve]

In such a conventional device, since the width of the terminal block 4 and the case 5 are narrow, the lead wires 6a, 6
Connecting pin 2 of corresponding terminal fitting 2 of b, 6c...
The soldering work to a and the subsequent work of storing the connected output wires 6a, 6b, and 6c in the case 5 are both troublesome and time-consuming, and wiring errors are likely to occur. In addition, the shape of the printed wiring board 7 becomes complicated in order to ensure an insulating distance from the connecting pin 2a on the back side of the terminal block, resulting in an increase in cost.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks, and to provide an electronic device in which the connection between the terminal fitting and the printed wiring board is easy and there is no erroneous connection, and the shape of the printed wiring board is also simple and inexpensive. There is a particular thing.

[Means for solving problems]

In order to achieve the above-mentioned object, this invention includes a case made of synthetic resin with mounting seats for a plurality of screw terminals formed on the upper side and an opening on one side, and an open side of the case that is attached to the mounting seats. A terminal fitting having a facing connection pin and having a tightening screw screwed thereto, and a connection hole on a conductive pattern through which the connection pin can be inserted, which is housed in the case from the opening side of the case and has an electronic component mounted thereon. and an insulating cover that removably closes the opening of the case.

[Effect]

In the electronic device based on this invention, the printed wiring board can be installed from the opening side of one side of the case.
The printed wiring board and the screw terminal can be connected by inserting the connecting pin of the terminal fitting into the connection hole on the conductive pattern of the printed wiring board without using a lead wire, which saves the need for lead wire processing. This makes it possible to perform soldering work in a wide area, shorten wiring work time, and prevent incorrect wiring.

〔Example〕

FIGS. 1 and 2 show an embodiment of an electronic device according to this invention, with FIG. 1 being an exploded perspective view and FIG. 2 being a cross-sectional view. In the figure, the same parts as those in the conventional device shown in FIG. The terminal block 12 is integrally molded with an opening on the side surface, a printed wiring board 13 is fitted so as to close this opening, and a connecting pin 14 of a terminal fitting 14 attached to the terminal block 12 is inserted.
a is adapted to be inserted into a corresponding connection hole on the conductive pattern 15 of the printed wiring board 13. Inside the case 11 are a seat 12a of the terminal block 12 provided with a slit (not shown) into which a terminal fitting 14 (described later) is press-fitted, a slit 11a into which a connecting pin 14a of the terminal fitting 14 is inserted, and a printed wiring board 13. catch seat 11
b, 11c, and a locking hole 11d for fixing a cover 16, which will be described later. Printed wiring board 1
3 is provided with a connection hole 15a on the conductive pattern 15 through which the connection pin 14a of the terminal fitting 14 can be inserted. The terminal fitting 14 has a seat 1 of the terminal block 12.
A rectangular seat plate 14c press-fitted into the seat plate 2a and having a screw hole 14b, and the aforementioned connecting pin 14a extending from one side of the seat plate 14c are provided. The cover 16 has a rectangular shape that can be fitted into the opening of the case 11, and has locking pawls 16a in the form of additional teeth that can be engaged with the locking hole 11d on the upper and lower sides, and is molded from synthetic resin.

To assemble the above configuration, first, a predetermined number of terminal fittings 14 are press-fitted into the seats 12a of the terminal block 12, and each of the connecting pins 14a is made to protrude through the slits 11a toward the opening side of the case 11. Next, the connection hole 15a provided in the conductive pattern 15 of the printed wiring board 13 is aligned with the connection pin 14a, and the printed wiring board 13 is connected to the receiving seat 11.
Push it into the case 11 until it contacts b and 11c. Then, the connection pins 14a protruding from the respective connection holes 15a and the conductive patterns 15 are connected by soldering, the remaining protrusions are cut, and the cover 16 is fitted to complete the process. Note that the two through holes 12b provided in the terminal block 12 are for making it possible to see the blinking of the two light emitting diodes 17 mounted on the printed wiring board 13. Therefore, with this configuration, the external wire screw terminal and the printed wiring board can be connected without using lead wires to connect the printed wiring board 13 and the terminal fitting 14, and erroneous wiring can be eliminated. Furthermore, since the printed wiring board has a rectangular shape, it is easier to process, and since soldering requires work in a large area, work time including assembly is significantly shortened and costs are reduced.

[Effect of idea]

According to this invention, the terminal block is integrally molded on the upper side of the case, the side surface is opened, and the printed wiring board is fitted in such a way as to close this opening, and each of the connection pins of the terminal fitting attached to the terminal block is By inserting the terminal into the corresponding connection hole of the printed wiring board, it is possible to provide an electronic device with a screw terminal that is free from incorrect wiring, shortens assembly time, and is inexpensive.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an example of an electronic device according to this invention, in which Figure 1 is an exploded perspective view, Figure 2 is a cross-sectional view, and Figure 3 is an example of a conventional electronic device. It is an exploded perspective view. 1... Screw, 3... Screw terminal, 11... Case, 12... Terminal block, 13... Printed wiring board, 14... Terminal fitting, 14a... Connection pin, 1
5... Conductive pattern, 15a... Connection hole, 1
6...Cover.

Claims (1)

[Scope of utility model registration request] A synthetic resin case with mounting seats for a plurality of screw terminals formed on the upper side and an opening on one side, and a connecting pin attached to the mounting seat of the case and facing toward the opening, into which a tightening screw is screwed. a printed wiring board that is housed in the case from the opening side of the case and has an electronic component mounted thereon and has a connection hole on the conductive pattern through which the connection pin can be inserted; and the opening of the case is attached and detached. An electronic device comprising: an insulating cover that can be closed freely.