JPS5935007Y2 - circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit board made of a laminated board having through holes.

Circuit boards, especially buttons on watch circuit boards made of laminated boards, require high-density wiring due to the structure and function of the watch, and as the width and spacing of conductive patterns become narrower, through-holes also become closer together.

In this case, etching solution, plating solution, etc., which are harmful to the manufacturing process, may penetrate through the through-hole walls between adjacent through-holes, resulting in a decrease in insulation resistance or leakage. As shown in FIG. 1, a through hole 3 that connects the conductive patterns 2a and 2b of the circuit board 1 and a conductive pattern pattern 2 a' j 2 b'
A window part 5 is inserted between the through hole 4 and the through hole 4 for conduction.
was provided to prevent a decrease in insulation resistance and leakage of the through holes 3 and 4.

However, since the through-holes 3 and 4 are close to each other, the width of the window 5 becomes narrower, which shortens the life of the punch of the die used to process it, and if the window 5 is misaligned, which of the through-holes It was clearly seen that the opening was biased to one side, which was not desirable in terms of appearance, and there was a problem in processing that the position of the opening had to be carefully determined.

Furthermore, when inserting the leads of the electrical element with leads into the through-holes 3.about.4, there is a problem in that the leads are inserted into the window portions 5 by mistake, resulting in defective IJ-adhesion.

The present invention was devised in view of the above-mentioned shortcomings, and its purpose is to improve the life of the die by providing a punching part for allowing parts of adjacent through-holes to fall out. It is an object of the present invention to provide a circuit board having adjacent through-holes that eases restrictions on positioning and allows easy and reliable work of attaching leads to electrical elements with leads.

Below, the embodiments of the present invention will be described based on the drawings.
The figure shows a partial conduction pattern of a circuit board 10 for an interval meter made of a laminated board, and conduction patterns 21a, 21b, and 21a' are provided on the front and back sides of the circuit board 10, respectively.

A button 21b' is formed and the conductive pattern 21a.

21b is connected to the conductive pattern 21 by the through hole 31.
a', 2lb' are electrically connected to the through hole 41.

Reference numeral 51 is a punched part formed by molding, and through holes 31 and 4 are formed.
It is installed with part of 1 removed.

In this embodiment, lands a, a' and lands b, b
' is electrically conductive before the punched portion 51 is formed, as shown by the two-dot chain line.

The present invention has the above-described structure, and by inserting the leads of the lead-equipped electric element into the punched part 51 (not shown),
The leads can be reliably set in the through holes 31 and 41.

Furthermore, in the case of an electric element with a lead that has elasticity that spreads outward, the punched part 5
2 has a circular shape, and by inserting the lead into the punched part 52 and rotating it, the lead can be easily and reliably inserted into the through hole 3',
It can be set to 4'.

According to the embodiment shown in FIG. 3, since the punching part 52 is circular, it is easy to process the die for punching, and the direction of the die during punching is not restricted in any way. have

The button 10 is a circuit board, 22a and 22b are conductive patterns connected by through holes 3', and 22a' and 22b'.
is a conductive pattern that is electrically connected by the through hole 4'.

As described above, the present invention is a type of punch that processes the punched parts by forming punched parts between adjacent through holes, and by making a part of the through holes fall off at the punched parts. It is possible to make the width or punch diameter significantly thicker than that of conventional punches, thus improving the life of the punch.

Further, when setting an electric element with a lead in a through hole, it is possible to easily and reliably set the lead in the through hole by inserting the lead into the punched part.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional structure, FIG. 2 is a plan view showing an embodiment of the present invention, and FIG. 3 is a plan view showing another embodiment of the present invention. 10...Circuit board, 21a, 21b, 21a'. 21b', 22a, 22b, 22a', 22t/-conducting pattern, 3L41, 3', 4'... through hole, 51.52... punching part.

Claims (1)

[Scope of utility model registration request] A circuit board made of a laminated board on which a conductive pattern is formed on the front and back sides and a plurality of through holes are provided to establish conduction between the conductive patterns on the front and back sides. A circuit board characterized in that a circuit board is provided with a section.