JPS60180707A - Perforation of printed plate - Google Patents

Abstract

PURPOSE:To prevent positional error of a perforation in a printed plate out of tolerance limit by providing drill-breaking plate for breaking a drill whose positional error is out of the tolerance limit. CONSTITUTION:A drill-breaking plate 2 is formed of a metal plate or insulating plate having a perforation at a position corresponding to a perforating position on a printed plate to be perforated, and the perforation 2a has a diameter D of the amount of a predetermined hole diameter d that is drill diameter and positional allowable error and is formed by etching, drilling or the like. If the positional error of a drill 1 is out of the tolerance limit, the tip end of the drill 1 comes in contact with the perforation 2a of the plate 2 to break the drill 1 itself and thereby to prevent perforation of the printed plate 4. Thus, there remains no possibility of forming a perforation whose positional error is out of tolerance limit.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a drilling method capable of drilling holes without shifting the hole position when preparing through-holes in a printed circuit board.

Background of the Technology Multilayer printed boards have been used in electronic devices such as communication devices and electronic dividing devices to rationalize wiring and component mounting. This multilayer printed board has through holes plated on the inner surface of the holes that penetrate the printed board to connect the conductors between each layer.
In recent multilayer printed boards, the number of through holes has increased as electronic devices have become more densely packed, and a single printed board can now have thousands of through holes.
It is coming.

Prior Art and Problems A high-speed numerically controlled drilling machine is usually used to prepare the through holes. On the other hand, the diameter of the pilot hole of the through hole is as narrow as 0.3 to 0.5 m, and the accuracy required for the hole position is strict. For this reason, when machining a large number of holes, there is a certain probability that the hole positions will shift. Conventionally, the only way to inspect this hole position shift was to apply a hole position inspection film to the hole after machining all the holes, and there was a problem in that it required a large amount of man-hours to inspect a large number of holes. .

Purpose of the Invention In view of the above-mentioned conventional problems, it is an object of the present invention to provide a method for drilling a printed board, which prevents hole position deviation exceeding an allowable value during drilling of through-holes in a printed board. .

According to the present invention, the perforation of the fractured niblint plate is adjusted to a predetermined position corresponding to a predetermined position, and the range in which the positional deviation of the hole is allowed is removed when preparing a through-hole in a printed board. Drilling of a printed board is achieved by placing a drill-destroying plate made of a metal plate or an insulating plate with holes on a broken niblint plate and drilling holes with a drill. Ru.

Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram illustrating the method of perforating a printed circuit board according to the present invention. In the figure, 1 is a drill, 2 is a plate for destroying the drill, 3 is an insulator or an entry metal, and 4 is a broken niblint plate.

In this embodiment, first, a drill breaking plate 2 is prepared. This drill breaking plate 2 is a metal plate or an insulating plate with holes drilled at positions corresponding to the positions of the broken niblint plate, and the holes 2a are located at a predetermined hole diameter d (i.e., the drill diameter). The tolerance value for deviation shall be added, and the hole shall be perforated by etching, drilling, etc. Next, this drill breaking plate 2 is aligned and placed on the broken niblint plate 4. At this time, in order to prevent damage to the broken niblint plate 4, it is preferable to insert an insulator or an entry metal 3 between it and the drill breaking plate 2.

Next, in this state, a hole is drilled using the drill 1.

This drilling may sometimes occur if the drill 1 is within the permissible misalignment range, the drill
The broken niblint plate 4 is perforated. If the drill 1 is misaligned beyond the allowable misalignment range, the tip of the drill 1 will come into contact with the hole 2a of the drill breaking plate 2 and break the drill itself, causing the hole in the broken niblint plate 4 to break. It will not be held in the morning. Therefore, holes exceeding the allowable range of positional deviation cannot be drilled.

Effects of the Invention As explained in detail above, the method of perforating a printed board according to the present invention is to use a drill-destroying plate that destroys a drill that is misaligned beyond the permissible misalignment range. This has a great effect in that it is possible to prevent holes from being drilled that are misaligned by more than the allowable value.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a method of perforating a printed board according to the present invention. In the drawings, 1 is a drill, 2 is a drill breaking plate, 3 is an insulator or entry metal, and 4 is a broken niblint plate.

Claims (1)

[Claims] 1. When drilling through-holes in printed circuit boards, holes in the shipwrecked Niblind board are made by drilling a metal plate or an insulating plate with a hole removed in a position that corresponds to a predetermined position to allow for misalignment of the hole. A method for drilling printed boards, which is characterized by placing a printing plate on top of a broken Niblint board and drilling holes with a drill.