RU2260255C1 - Printed-circuit board connector - Google Patents

Abstract

FIELD: radio engineering; packet-type electronic-equipment modules operating at heavy overloads of printed-circuit board connector.

SUBSTANCE: proposed printed-circuit board connector has insulating receptacle with guide windows whose oval jacks accommodate spring contacts in the form of multiturn oval springs; spring contact is installed in receptacle jack for its locking along small axis; receptacle is made of flexible insulating material and chamfered on its external perimeter; radius of receptacle jack generating line is greater than that of spring contact generating line.

EFFECT: enhanced reliability of connector due to reliable locking of spring contact in jack; enhanced contact pressure.

1 cl, 2 dwg

Description

The invention relates to radio engineering, in particular, to the design of batch-type electronic blocks operating under conditions of significant overload during operation. Such electronic components are subject to increased requirements for strength and vibration resistance with minimal mass and dimensions of the structure.

A well-known connector of printed circuit boards containing a block of electrical insulation material with guide windows in which contacts are placed in the form of multi-coil springs of oval shape [1].

The disadvantage of this connector is the presence of six inflection points of the spring contact with small bending radii, which are subjected to cyclic loads during repeated assembly and disassembly of the blocks, which, if the spring material significantly exceeds the tensile strength, can lead to breakage of the spring contact.

The closest technical solution is a PCB connector containing a block of electrical insulation material with guide windows, in the oval slots of which are placed spring contacts in the form of oval-shaped multi-coil springs [2].

A disadvantage of the known connector is the lack of a clear fixation of the spring contact in the socket of the block in which it is located, which leads to a decrease in the contact force and, therefore, to a decrease in the reliability of the electrical contact.

The technical task of the invention is to increase the reliability of the electrical connection of printed circuit boards.

This object is achieved in that in the well-known connector of printed circuit boards containing a block of electrical insulation material with guide windows, in the oval nests of which are placed spring contacts in the form of multi-coil springs of oval shape, in contrast to the prototype, a spring contact is installed in the socket of the block with the possibility of fixing it along the minor axis, the block is made of elastic insulating material and chamfers are made along the outer perimeter of the block, while the radius of the forming socket of the block is greater than the radius of shock spring contact.

Figure 1 shows the connector of the printed circuit boards in the initial state, installed in the block of elastic electrical insulating material; figure 2 presents the connector of the printed circuit boards in working condition, installed between the printed circuit boards of the electronic unit.

The connector of the printed circuit boards in the initial state (Fig. 1) contains a prefabricated block 1, consisting of two symmetrical halves made of elastic insulating material, the inner surfaces of which form an oval socket 2, inside of which there is a spring contact 3 in the form of an oval-shaped multi-coil spring. The radius R ₁ and the length of the generatrix of the radius R _{1 of the} oval socket 2 of the block 1 is always greater than the radius R ₂ and the length of the generatrix of the radius R _{2 of the} spring contact 3. The spring contact 3 is installed in the socket 2 of the block along the axis X-X with a minimum interference or clearance of minus 0 , 05 mm to plus 0.05 mm depending on the variation in tolerances in the manufacture of parts and with a gap between the outer generatrix of the spring contact 3 and the guide windows of the shoe 1 to exit the working part of the spring contact 3. It should be noted that the working parts of the spring contact 3 always protrusion removed from the window guide shoe 1 relative to the last surface. Four chamfers 4 are made on the outer surface of the block 1, reducing the rigidity of the block 1.

In the electronic block (Fig. 2), a block 1 with a spring contact 3 is mounted in a frame 5, which is located between adjacent printed circuit boards 6 having conductive contact pads 7. The entire package of printed circuit boards of the electronic block is pulled together by clamping elements (not shown). Since the height of the block 1 is always less than the height of the frame 5, there is always a guaranteed clearance between the block 1 and the printed circuit boards 6.

PCB connector works as follows.

When tightening a package consisting of alternating printed circuit boards 6 and frames 5 with pads 1 and spring contacts 3, the contact pads 7 on the printed circuit boards 6 press on the spring contacts 3, which are deformed, taking the form of a socket 2 of the block 1. At the same time, due to the chamfers 4 made along the outer perimeter of the shoe 1 and reducing its rigidity, and the shoe is elastically deformed, reliably fixing the spring contact 3 in the socket 2 of the shoe. Moreover, the contact pressure between the working parts of the spring contact 3 and the contact pads 7 on the printed circuit boards 6, with comparable sizes, is significantly higher than in the previously considered printed connectors. The entrapment of the spring contacts 3 inside the shoe 1 is eliminated by the design of the proposed connector, since the height of the spring contact 3 is always greater than the height of the shoe 1 and, therefore, the working parts of the spring contact 3 protrude from both sides of the shoe 1 relative to its surface.

Thus, increasing the reliability of the electrical connection of the printed circuit boards in the proposed design of the connector of the printed circuit boards is provided by the self-installation of the spring contact and rigid fixation in the socket of the block, increasing contact pressure and eliminating the possibility of contact dropping inside the block during multiple assemblies and disassemblies of electronic blocks.

Sources of information

1. RF patent №2019922, Н 05 К 1/00 dated 06/17/91

2. RF patent No. 1100763, N 05 K 7/02 of 06/17/82.

Claims (1)

A circuit board connector containing a block of electrical insulation material with guide windows, in the oval sockets of which spring contacts are arranged in the form of oval-shaped multi-coil springs, characterized in that the spring contact is mounted in the socket of the block with the possibility of fixing it along the minor axis, the block is made of elastic electrical insulation material and along the outer perimeter of the block chamfers are made, while the radius of the generatrix of the socket of the block is greater than the radius of the generatrix of the spring contact.

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