FR2507853A1 - Re-usable printed circuit board system without etching - has matrix of grooves into which wire conductors are inserted allowing formation of loop on path with aid of tool - Google Patents

Abstract

The insulating base upon the circuit is constructed and can be used for new circuits. The insulating grid has a network of orthogonal grooves with holes at their intersection points. Both faces of substrate leave a grid of grooves, allowing a high circuit density. Wires are forced into the grooves and are terminated, at the holes, at component connection points. A tool, which has a central and an eccentric prong is inserted into the holes, gripping the end of the wire. The tool is rotated to form a loop in the end of the wire. Connection is made between this loop and the component legs using a conventional solder joint.

Description

 The present invention relates to embodiments of the "printed circuit" type making it possible to electrically connect electronic components to each other, these being deposited on an insulating support.

 In known embodiments of this kind, the conductive tracks are made by mechanical or chemical etching or even by a photographic process on a metal layer, which is itself deposited on an insulating support. Other devices use the winding of a metal wire on the pins of a component support provided for this purpose, or even the use of self-adhesive metallic tape.

 The device according to the invention makes it possible to avoid the use of chemicals, photographs, or even supports for special components. the grooved insulating support associated with a tool is characterized by the forced insertion of the metal wire into the corresponding grooves and by the creation of loops on this same wire a ide of this tool.

 According to the first variant, the insulating support may have grooves on the two faces, thus providing a higher density of wiring.

 According to a second variant, the metal wire can be glued to the bottom of the grooves instead of being embedded.

 According to a third variant, the metal wire can be of a different section, thus allowing a reduction in the thickness of the loops on the insulating support.

 According to a fourth variant, the central spindle of the tool can be of a different diameter so as to make loops adapted to the dimensions of the connections of the different components.

 The device according to the invention (plate plus tool) makes it possible to carry out any problem of interconnection between components without the need to use products other than metallic wire.

The appended drawing is on the one hand a perspective view of the support
insulator, on the other hand a sectional view of the tool.

 As shown, the device comprises an insulating support (I) provided with a network of orthogonal grooves (2) each intersection that can be pierced (3) to allow the connection of the component to pass. your conductive tracks are made by forcefully inserting a metal wire (4). n look at the different holes (3) a loop is formed with the wire using the tool (5). The junction between the conductive track and the component connection was made by passing the latter through the loop, and then by welding as usual. The insertion of the metal wire (4) is stopped shortly before the hole (3), the central spindle (6) of the tool is engaged in this hole, the wire (4) having to pass between this central spindle and the outer spindle (7).

By a rotary movement of the tool, the wire is deformed to form a loop. depending on the amplitude of the rotation, a new track can originate either in the extension of the origin track of the loop, or n forming a right angle.

 The present device can be used in all cases where the user does not wish to handle chemical or photographic products, or when he realizes only a few circuits.

 the most interesting applications are the production of prototypes or final circuits at a lower cost, the plates being so reusable at all times

Claims (3)

CLAIMS I. Grooved insulating support (I) associated with a tool (5) in which a metal wire (4) can be embedded by force characterized in that one can make a loop on the path of this same wire i l using the tool (5).  2. Insulating support according to claim I, characterized in that it has grooves (2) on the two faces thereby increasing the density of the wiring.  3. An insulating support according to claims I and 2, characterized in that the metal wire (4) can be glued to the bottom of the grooves instead of being force-fitted.  -. Metal wire according to claim I, characterized by the tool can be of a different section in order to reduce the thickness of the loop on the support.  5. Tool according to claim I, characterized in that it allows to form loops of a different diameter adapted to the dimensions of the connections of the various components.