Locating hole structure of soft and hard multilayer circuit board and setting method of locating hole

Abstract

The invention discloses a locating hole structure of a soft and hard multilayer circuit board of a circuit via hole and a setting method of a locating hole. The locating hole structure is small in positional deviation and high in precision and is punched by a common target punching machine. A top layer window hole with the hole diameter being larger than that of the locating hole is formed in a top layer plate which is arranged at the position of a to-be-drilled locating hole in the multilayer circuit board, an exposed light transmitting target ring with the hole diameter being smaller than that of the locating hole is arranged on a soft plate which is surrounded by the top layer window hole, a lightproof target is arranged at the center of the light transmitting target ring, and a bottom layer window hole with the hole diameter being smaller than that of the locating hole and capable of enabling the light transmitting target ring to be exposed is formed in a bottom layer plate corresponding to the light transmitting target ring. A soft and hard combined plate of the structure is placed on the common target punching machine, and after the target is recognized, the locating hole is subjected to target punching. The soft plate which can be seen from the top layer window hole in a downward mode is completely supported on the bottom layer plate, the rigidity of the hole peripheral wall of the locating hole can be greatly improved, and when a dowel of the target punching machine is inserted into the locating hole, the locating hole cannot be deformed or enlarged or cannot deviate.

Description

technical field [0001] The invention relates to a positioning hole structure on a soft and hard multilayer circuit board and a method for accurately setting the positioning hole. Background technique [0002] Rigid-flex board, that is, flexible circuit board and hard board, after lamination and other processes, combined according to relevant process requirements to form a circuit board with the characteristics of flexible circuit board and rigid board, usually it is three layers, the top layer board and The bottom board is a hard board, and the middle layer is a soft board. [0003] The advantages of soft and hard boards over hard boards are as follows: [0004] 1. It is flexible, can be wired three-dimensionally, and can change shape according to space constraints. [0005] 2. High and low temperature resistance, flame resistance. [0006] 3. It can be folded without affecting the signal transmission function. [0007] 4. Can prevent electrostatic interference. [0008...

AI Technical Summary

Problems solved by technology

[0032] Drill the positioning hole 4 of the outer layer of the rigid-flex board through the X-RAY drilling machine, the accuracy is more guaranteed, but the equipment is more expensive, which increases the production cost input

Now the price of a better automatic X-ray target drilling machine in the industry is about 1 million RMB, not to mention better automatic X-RAY target drilling machines like Japan's Seiko (SEIKO) and Germany's SCHMOLL, the price is even higher. expensive

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