RU2319263C1 - Contacting device for electrical connection of rigid boards - Google Patents

Abstract

FIELD: radio, computer, and electrical engineering; electrical connection of printed-circuit boards by means of flexible printed cable.

SUBSTANCE: proposed contacting device for electrical connection of rigid printed-circuit boards incorporating block with groove and lugs in its slots locked in position be means of cleat has its clamp provided with pins and projection following shape of groove; flexible printed cable has holes for fastening on clamp pins and is non-insulated at points of contact with lugs following groove shape. Such mechanical design enables electrical connection of several printed-circuit boards by means of flexible printed cable. Implementing such design solution makes it possible to improve functional and operating capabilities of device. Small size of device enables its use in small-size instruments.

EFFECT: enlarged functional capabilities of device.

1 cl, 3 dwg

Description

The invention relates to radio engineering, computer engineering, electrical engineering and is intended to provide electrical connection of printed circuit boards using a flexible printed cable (GPC).

There are several analogues of a contacting device for electrically connecting printed circuit boards using flexible printed cables.

1. Device for providing electrical connection of a flexible conductive element of a flat type (flexible flat-type wiring member (FPC) with a mounting plate (Japanese patent No. 7-22127A). The design of the device includes:

- a plug (plug-in element) (plug member), having a horizontal and vertical arrangement, forming a cross-sectional structure in the form of an inverted letter L or a structure in the form of the letter T;

- contact pins located near the bottom surface of the horizontally located part and the side surfaces of the vertically located part;

- a cover (plug) for the plug, located opposite the horizontal part of the plug.

The vertically located part of the plug is inserted into the connector, and the FPC pad is located between the cover (plug) of the plug and the horizontally located part of the plug. With this construction, the horizontally located part of the plug presses the contact pads in the form of the letter V of the horizontally arranged parts of the contact pins of the plug. The horizontally spaced portions of the pin pins of the plug can dock with the FPC pad to provide an electrical connection, and therefore, the operation of connecting the pin pins of the plug to the FPC pad can be easily performed without having to perform a soldering operation.

The disadvantage of the electrical connection of the FPC with the plug is that it is necessary to apply a certain compressive force resulting from the elastic deformation of the contact pads in the form of the letter V of the horizontally arranged parts of the contact pins of the plug to the connecting part. The multi-output compressive force causes an increase in the loads acting on the horizontally located part of the plug. Thus, the horizontally located part is exposed to the reaction force of the total compressive force and, as a result, its deformation. In addition, with the help of this device it is impossible to carry out electrical connection of more than two printed circuit boards. Therefore, this device has low operational and functional capabilities.

2. Radio-electronic unit (patent RU 2216886, H05K 1/00, H05K 1/11). The device allows the use of standard printed circuit boards in blocks of a batch design with miniature circuit board connectors. The electronic block contains a package of printed circuit boards with contact pads, a circuit board connector with spring contacts located between the printed circuit boards and interacting with the contact pads, and fixing elements of the package, printed circuit boards are equipped with adapter pads, on the electrical insulation base of which there are contact pads, extended by flexible leads protruding behind the base of the adapter pads and soldered onto a circuit board.

The disadvantages of the electronic unit are:

- great complexity in the manufacture and assembly, since it is necessary to ensure a high degree of accuracy in the dimensions of parts and assembly units;

- low maintainability, due to the fact that with one assembly-disassembly, the inter-board connector with spring contacts fails and must be replaced;

- printed circuit boards with hinged electronic components are limited to a height of 5-6 mm, which excludes the use of electronic elements whose dimensions are greater than 5-6 mm in height;

- printed circuit boards are glued only on one side of the heat sink metal plates, so only half of the surfaces of the heat sink plates are used.

3. As a prototype, a device for ensuring electrical connection of a flexible conductive element of a flat type (Japanese patent No. JP 2006040832) was taken. It is an electrical connector that makes it easy to connect FPC and has a high reliability of the connection. The structure of the device includes:

- plug (plug-in element) to which the FPC is attached by clamping;

- A socket rigidly fixed to the circuit board. The pins of the socket contacts are wired to the pads of the circuit board.

The disadvantages of this device:

- a system of latches used to fix the plug, which under the influence of vibration and shock loads will not provide a reliable electrical connection;

- using the device, it is possible to provide an electrical connection with a single flexible conductor element of a flat type of only two printed circuit boards, since the design of the device provides only the end connection of its terminals;

- in the design of the device there is no direct contact of the terminals of the flexible conductive element of a flat type with the contacts of the socket, since the electrical connection is through the contacts of the plug. This leads to an additional transition resistance of the electrical connection, as a result of which the voltage drop across the device increases.

The purpose of the invention is the expansion of the functional and operational capabilities of the device.

This goal is achieved due to the fact that in the contact device for the electrical connection of printed circuit boards containing a block with a groove, in the grooves of which are laid petals fixed by a bar, a clamp and a flexible printing cable, the clamp has pins and a protrusion, repeating the shape of the groove, a flexible printing cable made with holes for mounting on the clamp pins and freed from insulation at the point of contact with the petals, repeating the shape of the groove.

A comparative analysis of the proposed solution with other technical solutions in this technical field did not allow to identify signs similar to the totality of the features of the claimed technical solution.

The invention is illustrated by drawings, where figure 1 shows the device in an unsecured state, figure 2 - the device at the time of clamping of the CCP, figure 3 - the same in section.

The device contains a block 1, in the grooves of which are placed the petals 2, fixed by a strap 3. In the clamp 4 there are two pins that serve as guides and fix the CCP 5. The CCP 5 has twenty-two conductors, the two extreme conductors being technological, in which there are holes. These holes serve to fix the CCP 5 on the clamp pins 4. A contact block is understood to mean a block 1 with petals 2, a strap 3, and a clamp 4. A contact block with the terminals of the petals 2 is soldered to the pads of the printed circuit board 6.

A block 1 with padded petals 2, which are fixed by a strip 3, is mechanically mounted on a printed circuit board 6, for example, with screws. Through the existing openings, the CCP 5 is fixed on the clamp pins 4. The clamp 4 is mechanically attracted to the block 1, for example, with screws. The electrical connection of the HPA 5 and the contact block is effected by the surface contact of the petals 2 and the printed conductors of the HPA 5. Due to the spring-loaded properties and the specially selected coating of the petals 2 and the printed conductors of the HPA 5, a reliable electrical connection with a low transition resistance (not more than 8.5 mOhm) occurs.

The device has small dimensions, which allows it to be used in small-sized devices. Compared with the prototype, the device has the following features that determine the positive effect (improved functional and operational capabilities):

1) the design of the device allows for electrical connection between multiple printed circuit boards;

2) mechanical clamping of the CCP in the contact block allows for reliable electrical contact under the influence of vibration and shock loads;

3) the number of transitions is reduced and, thus, the value of the transient resistances introduced by the device is reduced, since the electrical connection of the CCP and the contact block is carried out directly by the surface contact of the lobe and the printed conductor of the CCP.

Claims (1)

A contact device for the electrical connection of rigid printed circuit boards, comprising a block with a groove, in the grooves of which are laid petals fixed by a bar, a clamp and a flexible printed cable, characterized in that the clamp has pins and a protrusion that follows the shape of the grooves, the flexible printed cable is made with holes for fastenings on clamp pins and it is released from isolation in the place of contact with petals repeating the form of a groove.

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