Patent ID: 8178023

Claim:
A method for manufacture of a housing part provided with a ventilation filter, comprising: a step (A) of disposing a ventilation filter part including a support body and ventilation filter fixed to the support body in a forming die at a predetermined position and clamping the forming die; and a step (B) of injecting resin into a cavity defined within the forming die as a result of clamping to make the resin and the ventilation filter part into one piece and thereby molding a housing part formed of the ventilation filter part and the resin, wherein; the ventilation filter is in a form of a membrane and the support body is in a form of a frame to which a peripheral portion of the ventilation filter is fixed, a bottom face of the support body and an inner surface of the resin facing an interior of the housing part are almost flush with each other, and the forming die includes a concave portion in which the ventilation filter part is fit for positioning; in the step (A), the ventilation filter part is fit in the concave portion, the forming die is clamped in such a manner that the forming die comes into close contact with a top face, the bottom face and a part of a side face of the support body so as to prevent the resin from flowing over a ventilation region of the ventilation filter; and in the step (B), the support body being made integral with the resin only at a part of the side face of the support body that protrudes out from the concave portion and faces the cavity, the side face being defined between the top and bottom faces of the support body and being substantially linear when viewed in a vertical cross section of the support body.