KR0171372B1 - Mutual connecting method of printed circuit board assembly using optical-direct transmitting pattern - Google Patents

Abstract

The present invention relates to a method of interconnecting a printed circuit board assembly by an optical direct transmission method. A method of interconnecting a printed circuit board assembly according to the present invention is a method for interconnecting a plurality of printed circuit board assemblies using electrical connectors on a backplane and interconnecting one printed circuit board on a printed circuit board assembly requiring high speed signal interconnection. Each of the light receiving elements of the light emitting element is disposed on the printed circuit board assembly perpendicularly to the main transmission direction of the light beam so as to form a plurality of light emitting elements, and if a third printed circuit board assembly exists between the interconnection channels, Forming a printed circuit board hole for passing an optical signal on the printed circuit board assembly in the opposite position of the light emitting device or the light receiving device, and using the space between the printed circuit board assembly as an optical waveguide for the interconnection of the signal It is characterized by.

Description

The inter-connection method of printed board assembly using direct optical transmission

1 (a) and 1 (b) are some perspective and right side views schematically showing a method of interconnecting a PBA according to the prior art.

2 (a) and 2 (b) are partial perspective and left side views schematically showing a PBA interconnection method according to an embodiment of the present invention.

3 is a detailed view of a light emitting device and a light receiving device used in the interconnection of the PBA shown in FIG.

* Explanation of symbols for main parts of the drawings

20: electrical connector 30: backplane

41, 42, 43: printed circuit board assembly 41a, 42a: light emitting device

41b, 43b: Light receiving element 42c: PCB hole

50: socket

The present invention relates to a method of interconnecting a printed circuit board assembly by an optical direct transmission method.

More specifically, the present invention provides an electronic system including a plurality of printed board assemblies mounted on a back-plane, without using optical fiber cables and optical connectors, between printed circuit board assemblies. A method of interconnecting a printed circuit board assembly by an optical direct transmission method capable of performing high-speed signal transmission between printed circuit board assemblies using a space as a waveguide of an optical signal.

Recently, functions of communication systems and computer systems have become very complicated, and the operating speed has been increasing at a very high speed.

As a result, the number of signal lines interconnected between printed circuit board assemblies (hereinafter referred to as' PBA's) inside the system is increased, and the transmission speed of digital signals through the preferred lines is continuously increased. have.

In general, for high-speed transmission of electrical signals through the backplane, impedance matching of printed circuit boards (hereinafter referred to as 'PCB') and connectors used must be made very precisely. As a countermeasure is required, it is very difficult and technically difficult to solve the problem.

In order to solve the above problems, in the case of using the conventional optical fiber waveguide for high-speed transmission between the PCB, the high-speed transmission is easy, while in addition to the transmission path printed on the PCB, the optical fiber must be wired through the connector, The connection structure becomes complicated, and as a result, there is a problem that the installation and maintenance of the system is difficult.

1 (a) and 1 (b) are a partial perspective view and a right side view schematically illustrating a PBA interconnection method according to the prior art. As shown in FIG. 1, a conventional optical fiber ( 1) and an optical connector 2 were used to interconnect the plurality of PBAs 4 connected to the backplane 3.

At this time, the connection between optical fibers such as an optical transceiver 5 mounted on the PBA 4 to be interconnected is made through the optical fiber 1 and the optical connector 2.

However, the interconnection method of the PBA according to the related art, when interconnecting a plurality of PBA, when the interconnection amount is increased so that a plurality of optical fiber cables are wired, the system is very complicated mounting structure, the interconnection channel is increased Has a problem that the length of the trace on the PCB is long and expensive.

After all, the present invention is to solve the above problems of the prior art, an object of the present invention can simplify the structure of the system even when interconnecting a plurality of PBA, can increase the interconnection channel, The present invention provides a method of interconnecting a PBA, which can not only employ a low-cost optical device having a wide spectrum of wavelengths, but also shorten a trace length on a PCB and can significantly reduce costs.

The interconnection method of the PBA of the present invention to achieve the above object,

The light emitting element and the light receiving element are perpendicular to the main transmission direction of the light beam so that a plurality of PBAs are connected to the backplane by using an electrical connector and to form one interconnection channel on the PBA requiring high speed signal interconnection. At the same time, when the third PBA is present between the interconnection channels, the optical signal is passed on the PCB at the position opposite to the light emitting device or the light receiving device. It forms a PCB hole for the purpose, and uses the space between the PBA as an optical waveguide for interconnection of the corresponding signal.

At this time, in order to block light emitted in a direction not perpendicular to the surface of the PCB, the light emitting device and the optical device of the light receiving device has a means for interconnecting the electrode of the optical device and the electrical transmission path of the PCB, than the length of the optical device It is desirable to mount inside the socket with a large height.

Hereinafter, a PBA interconnection method according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

2 (a) and 2 (b) are partial perspective and left side views schematically showing a PBA interconnection method according to an embodiment of the present invention.

As shown in FIG. 2, in the interconnection method of the PBA according to the present invention, the PBAs 41, 42, 43 are connected to the backplane 30 by using the electrical connector 20, and the high speed signals are interconnected. The light emitting element 42a and the light receiving element 41b are disposed on the PCB perpendicularly to the main transmission direction of the light beam so as to form one interconnection channel on the required PBAs 41 and 42, and the PBA 41 And use the space between them as an optical waveguide for the interconnection of the signal.

In the case of non-adjacent PBAs 41 and 43, there is a third PBA 42 between the interconnection channels, such as the light emitting element 41a and the light receiving element 43b shown in FIG. In this case, a PCB hole 42c for passing an optical signal is formed on the PCB at a position opposite to the light emitting element 41a or the light receiving element 43b.

In the above method, the space between the PBAs is used as an optical waveguide for high-speed data transmission between PBAs, thereby replacing the conventional optical fibers.

FIG. 3 is a detailed view of the light emitting device and the light receiving device used in the interconnection of the PBA shown in FIG. 2, wherein the optical device is mounted on the PCB such that the main transmission direction of the light beam is perpendicular to the PCB surface. It is mounted inside a socket 50 with means for interconnecting the electrical transmission paths of the PCB.

At this time, the socket 50 has an appropriate clearance height d greater than the length of the optical element 43b, which is the light emitted in a direction other than the perpendicular to the PCB surface when the socket 50 is mounted on the PCB. It is to reduce the interference between channels by preventing the light to flow out to or from other adjacent optical waveguides to the maximum.

When the interconnection method of the printed circuit board assembly by the optical direct transfer method according to the present invention is used, an optical waveguide is formed by adding a hole to a required position on the PCB by matching electrical impedance, so that the optical inside the PCB It is much easier than laying the waveguide separately and can shorten the trace length on the PCB.

It also eliminates fiber optics and optical connectors for signal transfer between PBAs on the PBA, simplifying the system's mounting structure and allowing the entire surface of the PCB to be interconnected, greatly increasing the interconnect channel. In addition, the free space between the PBAs has less dispersion of optical signals and shorter waveguide distances than optical fibers, so that low-cost optical devices having a wide spectrum of light sources can be employed for high-speed transmission.

Claims (2)

Connect the light emitting element and the light receiving element to the main transmission direction of the light beam to connect a plurality of printed circuit board assemblies using a backplane electrical connector and to form one interconnection channel on the printed circuit board assembly where high speed signal interconnection is required. While the third printed circuit board assembly is disposed vertically opposite the printed circuit board assembly, and the third printed circuit board assembly is present between the interconnection channels, the printed circuit board assembly is positioned on the printed circuit board assembly at a position opposite to the light emitting device or the light receiving device. Forming a hole in the printed circuit board for passing the optical signal, and using the space between the printed circuit board assemblies as an optical waveguide for interconnecting the corresponding signals. The light emitting device of claim 1, wherein the light emitting device and the optical device of the light receiving device have a means for interconnecting the electrodes of the optical device with the electrical transmission path of the printed circuit board, and mounted inside the socket having a height greater than the length of the optical device. Interconnection method of a printed circuit board assembly.