JPS628598A - Mounting construction of circuit unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This is a mounting structure for a circuit unit, which provides the shortest and most reliable ground connection to an integrated circuit chip, thereby stabilizing the operation of high-speed, broadband, and high-gain high-frequency circuits in particular. obtain.

[Industrial application field]

The present invention relates to a mounting structure for a high frequency circuit unit used in an optical submarine repeater or the like, and more particularly to a mounting structure for a high frequency circuit unit that ensures the shortest and most reliable high frequency grounding to an integrated circuit chip.

In recent years, with the amazing progress of optical fibers, they have entered the practical stage and are now being used in optical submarine cables, etc. Therefore, high-frequency circuit units used in optical submarine repeaters and the like are required to operate stably at high speed, wide band, and high gain. However, the ground structures of these high-frequency circuits such as optical submarine repeaters are relatively long and complex, making it difficult to achieve stable operation and have reliability issues. There is a strong demand for improvements in the mounting structure of high-frequency circuit units to improve reliability.

[Conventional technology]

Figure 2 is a diagram explaining the mounting structure of a conventional high-frequency circuit unit. It is an enlarged view of a grounding part when there is no grounding part.

In the figure, a case 5 corresponding to the hole of a printed board 1 having a hole for mounting a high frequency circuit unit is shown.
Block 4 made of a metal with good thermal conductivity, such as copper, etc.
Mounted parts 2 such as integrated circuits are attached to this block 4.
The printed circuit board 3 is mounted on a buffer member 8 made of rubber or the like, and is screwed with a tightening screw 10 via a presser fitting 9, as shown in FIG. 2(b). The ground pattern and the block 4 are connected by a ground connection line 6. Then, the position of the circuit board 3 where grounding is required and the grounding connection wire 6
are connected with a connecting ribbon 7 made of a metal with good conductivity, such as gold, or if there is no printed circuit board 1, a ground connecting wire 6 is connected to the block 4, as shown in FIG. After that, a position on the circuit board 3 that requires grounding is connected to a grounding line 6 using a connecting ribbon 7 made of a metal with good conductivity, such as gold.

[Problem that the invention seeks to solve]

In the conventional circuit unit mounting structure described above, whether there is a printed board l around the circuit unit or not, the ground connection wire and connection ribbon are used to ground the circuit unit. Since the ground for the chip of the component (integrated circuit) is long and complex, it is difficult to stabilize the operation of the high frequency circuit, and there are problems with reliability.

[Means for solving problems]

The present invention solves the above-mentioned problems and provides a circuit unit mounting structure that stabilizes the operation of a high-frequency circuit and improves its reliability.

That is, in the mounting structure of the circuit unit, a hole 31 is provided near a portion of the circuit board 3 on which the component 2 is mounted that requires grounding, and a hole 31 is provided in the block 4 on which the circuit board 3 is mounted. At the position corresponding to the hole 31,
This problem is solved by installing the pin 13 and performing grounding through the pin 13.

[Effect]

The mounting structure of the circuit unit is as follows: A hole is formed in the circuit board, a pin is implanted in the position of the heat dissipation block corresponding to the hole, and the ground position of the circuit board and the pin are connected with a metal fitting.
This provides the shortest and most reliable grounding for integrated circuit chips.

〔Example〕

FIG. 1 is a diagram illustrating an embodiment of the present invention.
1 is a side sectional view, and (b) is an enlarged sectional view of main parts, in which the same parts as in FIG. 2 are given the same reference numerals.

In the figure, a case 5 corresponding to the hole of a printed circuit board 1 having a hole for mounting a circuit unit is made of a metal with good heat conduction, such as copper, and has a counterbore in which a pin 13 is implanted. 41 and a block 4 having pins 13 made of a metal with good conductivity, such as copper, is attached.
Mounted parts 2'' such as integrated circuits are mounted on this block 4, and a circuit board 3 having a hole 31 through which a pin 13 implanted in the blob 4 is inserted is placed between a buffer member 8 made of rubber or the like and a presser. After screwing the clamping screw 10 through the metal fitting 9, the metal fitting 4 made of a metal with good conductivity, such as copper, for ground connection is inserted into the pin 13 implanted in the block 4.
It has a structure in which a metal fitting 14 fitted into a pin 13 is pressed into contact with the other end of the pin 13 being bonded to the ground position of the circuit board 3.

In this embodiment, the pin 13 and the metal fittings 14 are made of copper, but they are not limited to copper, and may be made of gold, gold-plated brass, or other materials that have good conductivity and low high-frequency resistance.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the integrated circuit chip can be grounded as quickly and reliably as possible, stabilizing the operation, and being extremely effective in improving reliability.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.
) is a side sectional view, (b) is an enlarged sectional view of the main part, and FIG. 2 is a diagram explaining the mounting structure of a conventional circuit unit.
1 is a side sectional view, (b) is an enlarged view of the ground portion with a printed board, and (C) is an enlarged view of the ground portion without the printed board. In the figure, 1 is a printed board, 2 is a mounted component, 3 is a circuit board, 4 is a block, 5 is a case, 6 is a 7-seat exclusive line,
7 is a connecting ribbon, 8 is a buffer member, 9 is a holding metal fitting, 10 is a tightening screw, 11 is a mounting metal fitting, 12 is a set screw, 13 is a bead, 14 is a metal fitting, 31 is a hole, 41 is a 1 o call Hi- Mo” Iσsujzurdb7σ 416 mare FI5 Shibaimefi] Ninto False 4kuL1 Name Rainbow Figure 1

Claims (1)

[Claims] A block (4) on which a hole (31) is provided near a portion of a circuit board (3) on which the component (2) is mounted that requires grounding, and the circuit board (3) is mounted thereon. A pin (13) is installed at a position corresponding to the hole (31) formed in the circuit board (3), and grounding is achieved through the pin 13 installed in the block (4). A circuit unit mounting structure characterized by: