Seal structure
To provide a seal structure which has a seal member integrally formed on a flexible wiring board without peeling off an insulating layer (top coat) of the flexible wiring board, has excellent sealing performance and can be manufactured at a low cost, the seal structure is composed of a housing, to which the flexible wiring board is inserted, and the seal member, which is integrally formed with the flexible wiring board and seals a gap between the housing and the flexible wiring board, the flexible wiring board is composed of a base FPC composed of an elastic material, a patterned copper foil and an adhesive layer, conductive electromagnetic shielding layers formed on surfaces of the base FPC, and insulating layers covering surfaces of the electromagnetic shielding layers, and the seal member is integrally formed directly on the insulating layers by using a self-adhesive liquid rubber.
1. A seal structure comprising:
a housing to which a flexible wiring board is inserted; and
a seal member integrally formed with said flexible wiring board for sealing a gap between said housing and said flexible wiring board,
wherein said flexible wiring board is constructed by a base FPC constituted by an elastic material, a patterned cupper foil and an adhesive layer, conductive electromagnetic shielding layers formed on surfaces of said base FPC, and insulating layers composed of alkyd resin covering surfaces of said electromagnetic shielding layers,
wherein said seal member is composed of a self-adhesive silicone rubber; and
wherein said seal member is baked and formed integrally directly on said insulating layers of said flexible wiring board by using metal molds to provide a protruded portion having a mountain-shaped cross section.
2. A seal structure as claimed in claim 1 , wherein said housing is that of an electronic device.
3. A seal structure as claimed in claim 2 , wherein said electronic device is a cellular phone.
4. A seal structure as claimed in claim 1 , wherein said housing is that of a water proofing connector.
5. A seal structure as claimed in claim 1 , wherein said seal member is provided at each side of said flexible wiring board.
6. A seal structure as claimed in claim 1 , wherein said seal member is a frame body shaped seal for sealing mating faces of said housing.
7. A seal structure as claimed in claim 1 , wherein said seal member is a bush shaped seal installed to an insertion hole provided in said housing.
8. A seal structure as claimed in claim 1 , wherein said seal member is constituted by a combination of said frame body shaped seal and said bush shaped seal.