JPS6018865Y2 - printed wiring board - Google Patents

Description

[Detailed description of the invention] This invention relates to printed wiring boards used in electrical equipment such as radio receivers and communication devices, and has a simple structure that can improve the mounting density of components, and is economical and easy to assemble. The purpose is to provide an excellent printed wiring board with good serviceability.

Printed wiring boards used in electrical equipment are generally limited by the size of the equipment, the internal configuration of the equipment, the mounting direction of the display, etc., and the two-dimensional installation space for the printed wiring board inside the equipment is small. If the printed wiring board must be stored away from the speakers installed inside the device, the printed wiring board is often divided and the sub printed wiring board is placed vertically on top of the main printed wiring board. .

In this case, an expensive detachable connector must be used to facilitate the replacement of parts on the sub-printed wiring board disposed on the main printed wiring board.

On the other hand, when using a PLL circuit to add a frequency synthesizer reception function to electrical equipment, for example, an expensive high-quality paper-based epoxy resin laminate is used as the printed wiring board, and the entire printed wiring board is covered with a shielding case. There was a need.

However, when a printed wiring board is constructed taking into account the above requirements, expensive removable connectors are used to facilitate the replacement of parts on the sub-printed wiring board placed on the main printed wiring board. However, there is another problem in that the cost is high because an expensive high-quality paper-based epoxy resin laminate is used to construct the PLL circuit.

Moreover, since the sub printed wiring board is connected to the main printed wiring board only by a removable connector, it is difficult to securely fix it.

The present invention is intended to eliminate such conventional drawbacks, and the present invention will be described below with reference to drawings of embodiments.

The drawing shows an embodiment of the present invention, and in the drawing, 1 is a main printed wiring board, 2 is a sub printed wiring board, and 3 is an L-shaped connector, one terminal of which is soldered to the sub printed wiring board 2 in advance. The other terminal is then soldered to the main printed wiring board 1 to establish an electrical connection between the main printed wiring board 1 and the sub printed wiring board 2.

4 is another sub-printed wiring board, which is formed integrally with the main printed wiring board 1, and will be soldered later at perforation 5.
By dividing the board, it becomes a sub-printed board.

Reference numeral 6 denotes a strip-shaped parallel lead wire that can be freely deformed, and serves to electrically connect the sub printed wiring board 4 and the main printed wiring board 1.

Reference numerals 7 and 8 indicate mounting brackets formed in a substantially U-shape, which are fixed to the main printed wiring board by bending the legs that pass through the main printed wiring board 1, and are fixed to the main printed wiring board with screws 9 and 10. Fixed.

11 is a fluorescent display attached to the sub-printed wiring board 4;
12 is a general discrete electrical component attached to the sub printed wiring board 4 and the main printed wiring board 1, and 13 is a PLL circuit attached to the sub printed wiring board 2.

Here, the main printed wiring board 1 and the sub printed wiring board 4
A paper-based phenol resin laminate is used for the sub-printed wiring board 2, and a paper-based epoxy resin laminate is used for the sub-printed wiring board 2.

The printed wiring board configured in this way is housed in a cabinet 14 made of synthetic resin, as shown in FIG.
It is covered by a shield case 15.

The display 11 faces the display window 17 provided in the cabinet 14 through the window hole 16 provided in the shield case 15, and the speaker 18 provided in the cabinet 14 is connected to the sub printed wiring board 2, It is opposed to main printed wiring boards 1 other than 4.

As described above, the present invention provides the sub printed wiring board 2 which is soldered and fixed on the main printed wiring board 1, and the sub printed wiring board 4 which is connected by the parallel lead wire 6 on the main printed wiring board 1. The sub-printed wiring board 2 is fixed to the mounting brackets 7 and 8 with the screws 9, and the sub-printed wiring board 2 is fixed to the mounting brackets 7 and 8 with the electrical parts and connectors soldered in advance. The wiring board 4 and the main printed wiring board 1 are mechanically connected and soldered, and then divided at the perforation 5 and the sub printed wiring board 4 is fixed to the mounting brackets 7 and 8 with screws 10. , soldering using a solder bath can be easily performed, and there is no need to perform wiring processing afterwards, improving assembly work efficiency.

On the other hand, when replacing parts on the sub-printed wiring board 2.4, it can be easily done by simply removing the screws 10, and the serviceability is also very good.

Moreover, since the sub printed wiring board to which the connector is connected can be made of a material different from the other sub printed wiring boards and the main printed wiring board, only the sub printed wiring board to which the connector is connected can be made of paper-based epoxy resin laminate. A PLL circuit can be mounted as a PLL circuit, and the cost of a printed wiring board when mounting a PLL circuit can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the printed wiring board of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is an assembled perspective view thereof, and FIG.
The figure is a cutaway sectional view showing how the printed wiring board is assembled into the cabinet. 1... Main printed wiring board, 2, 4...
Sub-printed wiring board, 3... Connector, 5...
...perforation, 6...lead wire, 7,8...
...Mounting bracket, 9, 10...screws.

Claims (2)

[Scope of utility model registration request] (1) Two sub printed wiring boards are placed parallel to each other on the main printed wiring board, and these two parallel sub printed wiring boards are fixed to a substantially U-shaped mounting part placed between them, and one The secondary printed wiring board is wired by soldering the L-shaped connector pre-soldered on the secondary printed wiring board to the main printed wiring board, and the other secondary printed wiring board fixed to the above mounting parts has a A printed wiring board characterized in that a display is mounted and wired to a main printed wiring board with lead wires, and only one of the sub printed wiring boards is made of a high-quality paper-based epoxy resin laminate and is equipped with a PLL circuit. (2) Utility model registration claim No. 1, characterized in that the sub printed wiring board wired with lead wires is constructed as one piece with the main printed wiring board, and the soldering is later divided by perforations etc. The printed wiring board according to item 1.