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circuit board

A circuit board and board body technology, applied in the direction of printed circuit components, etc., can solve the failure of EMI test and the easy conduction of electron flow from the inner layer of the circuit board to the shielding shell of the electronic device through the exposed copper area 120 of the screw hole and the screw. and other problems to achieve the effect of reducing electromagnetic interference

Active Publication Date: 2017-12-08
嘉兴威伏半导体有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a screw (not shown) is locked into the conductive via 110, the exposed copper area 120 will be in contact with the screw, so that electron flow is easily conducted from the inner layer of the circuit board to the shielding of the electronic device through the exposed copper area 120 of the screw hole and the screw. shell, this is the so-called jump phenomenon, and will cause EMI test failure

Method used

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Embodiment Construction

[0045] A number of embodiments of the present invention will be disclosed in the following diagrams. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. In addition, the drawings are for illustrative purposes only and are not drawn to original scale. For ease of understanding, the same components will be described with the same symbols in the following description.

[0046] Firstly, in order to avoid the electrical connection between the exposed copper area 120 and the screw locked into the conductive via 110 in the conventional technology, thereby generating electromagnetic interference (Electromagnetic Interference, EMI), a protective layer 230 (shown in Fig. Figure 2 to Figure 5 ) to cover the exposed copper area 120, so as to avoid jumping phenomenon and reduce electromagnetic wave interference.

[0047] Please al...

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Abstract

A circuit board includes a board body, a protective layer and screws. The surface of the board body has a conductive through hole, and there is a copper exposed area around the conductive through hole. The protective layer has a breach, and a plurality of slits extend radially around the breach. The breach is aligned with the opening of the conductive via hole and the size of the breach is smaller than the opening size of the conductive via hole, and the area between two adjacent slits covers at least part of the exposed copper area. The screw lock is attached to the conductive through hole, and at least part of the protective layer is clamped between the screw and the conductive through hole.

Description

technical field [0001] The invention relates to a circuit board, more particularly to a circuit board capable of preventing electromagnetic wave interference. Background technique [0002] During the operation of electronic equipment, there will be intermittent or continuous changes in voltage, current and electric field, and sometimes the rate of change is quite fast, which will cause electromagnetic energy induced between different frequencies (frequency) or a frequency band (band), and the corresponding The circuit in the circuit will emit this electromagnetic energy into the surrounding environment and generate electromagnetic wave interference (Electromagnetic Interference, EMI). [0003] At present, copper is usually exposed on the surface of screw holes of general circuit boards, and shielding shells of electronic equipment are overlapped with circuit boards through screw holes. The structure of the shielding shell overlapping the screw holes makes it easy for the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K1/02
Inventor 李烈兆
Owner 嘉兴威伏半导体有限公司