JPH10160943A - Mounting structure for printed circuit board for e/o converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a mounting area of electric parts on a printed circuit board by forming a hole on the printed circuit board and transferring optical fibers through the hole. SOLUTION: An optical connector 21, a PD 24 and an LD 25 are mounted on an area 2 of a surface 1A becoming a mounting surface of optical parts. A wire bundle part 2S circuiting the optical fiber 2A connecting between optical parts is mounted on the surface 1B becoming a pattern surface of an electric parts group. Then, the rectangle hole 10 is formed on the area 2, and the optical fiber 2A connecting between the optical parts is wound circularly in the shape circuiting. Then, it is bundled by a wire bundle jig to be mounted on the printed circuit board 1. In such a manner, by transferring the optical fiber 2A through the hole 10, and arranging the wire bundle part 2S on the pattern surface of the electric parts group, the mounting area of the electric parts group is secured widely. In such a case, the optical fiber 2A transferring through the hole 10 is held in the vicinity of the hole 10 within the range of curvature without changing a characteristic of light transmitting through the optical fiber 2A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a mounting structure of a printed circuit board for an E / O (electric / optical) converter. In particular, the present invention relates to a printed circuit board mounting structure including an optical component group that generates an electrical signal and an optical component group that includes at least an optical connector that emits an optical signal.

[0002]

2. Description of the Related Art An electric component and an optical component are mounted on a printed circuit board serving as an E / O converter. The above-mentioned electric components are composed of resistors, capacitors, ICs, and the like used in a power supply circuit, a light control circuit, and a bus control circuit.

[0003] Optical components include optical connectors for emitting optical signals. Further, these optical components include an isolator, a beam splitter, a photodiode, a semiconductor laser, and the like, and the optical components are connected by an optical fiber. Note that
The isolator is abbreviated as ISO, the beam splitter as BS, the photodiode as PD, and the semiconductor laser as LD.

Next, an example of a conventional printed circuit board mounting structure will be described with reference to FIG. An optical connector 21, an ISO 22, a BS 23,
An optical component group such as the PD 24 and the LD 25 is mounted. Area 3
In 0, a group of electric components such as a bus control circuit and a light control circuit is mounted. The regions 20 and 30 are the mounting surface 11A of the printed board 11, and the opposite surface is the pattern surface 11B.

[0005] In FIG. 3, an optical fiber 2A connecting between optical components is wound in a circular shape in a circling manner. Then, they are bundled by the bundle jig 2 </ b> B and mounted on the printed circuit board 11. In FIG. 3, there are two bundled portions 2S circling the optical fiber 2A.

In the bundle section 2S, the distance of the bundle jig 2B is at least twice the bending radius in consideration of the minimum bending radius of the optical fiber 2A. FIG. 4 is a sectional view of the bundle jig 2B. FIG. 4A shows a state in which the optical fibers 2A are bundled, and FIG. 4A shows a state before the optical fibers 2A are bundled.

[0007]

In FIG. 3, the area 20 where the optical component is mounted has a large area occupied by the bundled portion 2S of the optical fiber 2A. As the wire diameter of the optical fiber 2A increases, the area occupied by the bundle portion 2S increases. on the other hand,
There are cases where there are restrictions on the external dimensions and mounting height of the printed circuit board, and there is a need for a mounting structure that properly arranges electrical components and optical components on the printed circuit board under the restrictions.

According to the present invention, a bundled portion of an optical fiber is mounted on a surface opposite to a mounting surface of an optical component and an electric component, and the optical component is connected by an optical fiber through a hole, thereby reducing a mounting area of the electric component. It is an object of the present invention to provide a mounting structure of a printed circuit board for an E / O converter which can be secured more.

[0009]

In order to achieve this object, the present invention provides a printed circuit board 1 comprising a group of electrical components for generating an electrical signal and a group of optical components including at least an optical connector 21 for emitting an optical signal. An E / O converter that is mounted and converts an electric signal into an optical signal, and is a surface 1A of the printed circuit board 1.
, An electrical connector group and at least an optical connector 21 are mounted thereon, and a bundled portion 2S circling an optical fiber 2A connecting the optical components is mounted on a surface 1B opposite to the surface 1A. Is formed, and the optical fiber 2 </ b> A comes and goes in the hole 10.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a mounting structure according to an embodiment of the present invention, and the same reference numerals are given to the same parts as those of the conventional mounting structure shown in FIG.

The surface 1A of the printed circuit board 1 shown in FIG. 1 has a region 3 on which a group of electric components for generating an electric signal is mounted and a region 2 on which a group of optical parts including at least the optical connector 21 is mounted.
It consists of.

An optical connector 21, a PD 24, and an LD 25 are mounted in a region 2 on a surface 1A serving as a mounting surface of an optical component. On a surface 1B serving as a pattern surface of the electrical component group, a bundle portion 2S that circulates around an optical fiber 2A connecting the optical components is mounted. Then, a rectangular hole 10 is formed in the area 2.

FIG. 2 is a view of the printed circuit board 1 as viewed from the surface 1B side. As shown in FIG. 2, ISO 22 and BS 23 having relatively low mounting height are mounted on the surface 1B. Then, the optical fiber 2A connecting the optical components is wound in a circular shape around the optical fiber. The bundle is bundled by the bundle jig 2 </ b> B and mounted on the printed circuit board 1.

As described above, according to the present invention, the holes 10 are formed in the printed circuit board 1, the optical fibers 2A come and go in the holes 10, and the bundled portions 2S are arranged on the pattern surface of the electric component group. As shown in (1), the mounting area 3 of the electric component group can be secured wider than before.

Further, in the embodiment, the guide jig 2C is arranged near the hole 10 on both the surfaces 1A and 1B. The optical fiber 2A can move between the surface 1A and the surface 1B via the hole 10 of the printed circuit board 1. The guide jig 2C is an optical fiber 2A
It is provided to prevent excessive force from being applied.

The structure of the guide jig 2C is such that it can be mounted on the printed circuit board 1 and has a through hole through which the optical fiber 2A can pass. Then, the optical fiber 2A coming and going to the hole 10 within the curvature range where the characteristics of the light passing through the optical fiber 2A does not change is held near the hole 10. If the vertical and horizontal widths of the hole 10 are properly set and the distance between the guide jigs 2C is properly set, the area of the hole 10 can be minimized.

Although the present invention has proposed a mounting structure of a printed circuit board for an E / O converter, a printed circuit board for an O / E (optical / electric) converter using the optical connector 21 for receiving an optical signal has been proposed. The mounting structure does not depart from the technical idea of the present invention.

[0018]

According to the present invention, an electronic component group for generating an electric signal and an optical component group including at least an optical connector for emitting an optical signal are mounted on a printed circuit board, and an E / E converter for converting the electric signal into an optical signal is provided. An O-converter, wherein an electrical component group and at least the optical connector are mounted on a first surface of the printed circuit board, and a bundled portion circling an optical fiber connecting the optical components is provided on the first surface. Mounted on the second side, which is the opposite side,
Since a hole is formed in the printed circuit board and the optical fiber flows to and from the hole, the mounting area of the electric component on the printed circuit board can be expanded more than before.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mounting structure on a printed circuit board according to an embodiment of the present invention.

FIG. 2 is a view as seen from the opposite side of FIG. 1;

FIG. 3 is a diagram showing a mounting structure on a printed circuit board according to the related art.

FIG. 4 is a sectional view of a bundle jig 2B.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 1A surface 1B surface 2 area | region 2A optical fiber 2B bundled jig 2C guide jig 2S bundled part 3 area 21 optical connector 22 isolator 23 beam splitter 24 photodiode 25 semiconductor laser

Claims (2)

[Claims] An electronic component group for generating an electrical signal and an optical component group including at least an optical connector for emitting an optical signal are mounted on a printed circuit board, and the electrical signal is converted to an optical signal.
/ O converter, wherein an electrical component group and at least the optical connector are mounted on a first surface of the printed circuit board, and a bundled portion circulating around an optical fiber connecting the optical components is provided on the first surface. The optical fiber is mounted on a second surface which is the opposite surface of the printed circuit board, a hole is formed in the printed circuit board, and the optical fiber is moved in and out of the hole.
Mounting structure of printed circuit board for / O converter. 2. The E / O according to claim 1, wherein said optical fiber coming and going to said hole is held in the vicinity of said hole in a curvature range where the characteristics of light passing through said optical fiber do not change. Mounting structure of printed circuit board for converter.