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US 5,294,755 AGranted
Printed wiring board having shielding layer
AssigneeNippon CMK Corp.
InventorsShin Kawakami, Satoshi Haruyama, Hirotaka Okonogi
Life of this patent
Estimating the term…
Abstract
A printed wiring board having a shielding layer for use in an integrated circuit is disclosed. The printed wiring board comprises an insulating sheet having a connecting through hole portion, a printed wiring circuit provided on one or both surfaces of the insulating sheet, an insulating layer having a thickness of 20.about.50 .mu.m which is provided on the printed wiring circuit, and an electromagnetic shielding layer provided on the insulating layer.
Claims16
A printed wiring board comprising:
- an insulating sheet having a connecting through hole portion, a printed wiring circuit provided on at least one surface of the insulating sheet and having at least one connecting land having an upper peripheral edge portion spaced from the insulating sheet, an insulating layer provided on the printed wiring circuit, the insulating layer forming a cup-shaped relief angle portion with the upper peripheral edge portion of the at least one connecting land, and an electromagnetic shielding layer provided on the insulating layer and on the at least one connecting land.
A printed circuit board comprising:
- an insulating substrate;
- a printed circuit on at least one surface of the substrate and having at least one connecting land having an upper peripheral edge portion spaced from the substrate and an upper surface bounded by the upper peripheral edge portion;
- an insulating layer disposed on and covering the printed circuit, the insulating layer having a thickness greater than that of the at least one connecting land and extending downwardly to the upper peripheral edge portion of the at least one connecting land to define a cup-shaped relief angle;
- and an electromagnetic shielding layer on the insulating layer and on the upper surface of the at least one connecting land.
1 more element
Dependencies are inferred from the claim text.