Printed wiring board
First Claim
Patent Images
1. A printed wiring board comprising:
- an insulating board which includes a plurality of electrically insulating layers which are laminated;
an electronic component which is built in the insulating board;
a signal transmitting lead which is provided at an interlayer between the electrically insulating layers;
an auxiliary lead which is provided on the insulating board while the auxiliary lead is not in electrical contact with the signal transmitting lead; and
an electromagnetic shielding layer which covers at least a part of the auxiliary lead.
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Accused Products
Abstract
A signal transmitting lead 105 is provided on an electrically insulating layer 103. Auxiliary leads 104A and 104B are provided while the auxiliary leads 104A and 104B are not in electrical contact with the signal transmitting lead 105. At least a part of the auxiliary leads 104A and 104B is covered with an electromagnetic shielding layer 106. Consequently, radiant noise from the inside or the outside of a printed wiring board can be suppressed without degrading characteristics of a signal which is transmitted through the signal transmitting lead 105.
24 Citations
24 Claims
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1. A printed wiring board comprising:
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an insulating board which includes a plurality of electrically insulating layers which are laminated;
an electronic component which is built in the insulating board;
a signal transmitting lead which is provided at an interlayer between the electrically insulating layers;
an auxiliary lead which is provided on the insulating board while the auxiliary lead is not in electrical contact with the signal transmitting lead; and
an electromagnetic shielding layer which covers at least a part of the auxiliary lead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A manufacturing method of a printed wiring board which includes an insulating board which includes a plurality of electrically insulating layers which are laminated, an electronic component which is built in the insulating board, a signal transmitting lead which is provided at an interlayer between the electrically insulating layers, an auxiliary lead which is provided on the insulating board in a state that the auxiliary lead is not in electrical contact with the signal transmitting lead, and an electromagnetic shielding layer which covers at least a part of the auxiliary lead, comprising the steps of:
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preparing a transfer forming material and pattern-forming the auxiliary lead on the transfer forming material;
pattern-forming the electromagnetic shielding layer on the auxiliary lead layer on the transfer forming material; and
transferring the auxiliary lead from the transfer forming material to the electrically insulating layer by making the electromagnetic shielding layer about on the electrically insulating layer. - View Dependent Claims (24)
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Specification