Circuit unit for electronic instrument having key-pad arrangement
AssigneeFujitsu Limited
InventorsFumio Mitamura, Mitsuo Inagaki
Life of this patent
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Abstract
A circuit unit is used in an electronic instrument having a key-pad arrangement, such as a portable telephone, and comprises a printed circuit board, a flexible switch circuit sheet attached to the printed circuit board and having a plurality of switch pads arranged thereon, and at least one circuit pattern formed in the flexible switch circuit sheet so as to construct a switch circuit together with the switch pads. The circuit pattern includes a plurality of line sections extended between the switch pads, and a plurality of terminals provided along a peripheral edge of the flexible switch circuit sheet for establishing an electrical connection between the printed circuit board and the flexible switch circuit sheet.
Claims10
A circuit unit incorporated in an electronic instrument having a key-pad arrangement, which unit comprises:
- a printed circuit board;
- a flexible switch circuit sheet attached to said printed circuit board and having a plurality of switch pads arranged thereon;
- and
- at least one circuit pattern formed in said flexible switch circuit sheet so as to construct a switch circuit together with said switch pads, said circuit pattern including a plurality of line sections extended between said switch pads, and a plurality of terminals provided along a peripheral edge of said flexible switch circuit sheet for establishing electric connection between said printed circuit board and said flexible switch circuit sheet.
Dependencies are inferred from the claim text.