Method of manufacturing fingerprint recognition home key in mobile for preventing primer permeation

PURPOSE: A method for manufacturing home keys recognizing fingerprints of portable devices is provided to prevent primer coated on an injection-molded product formed in a home key shape from overflowing to the outside and to prevent a primer layer from being partially dented by permeating into the injection-molded product. CONSTITUTION: A method for manufacturing home keys recognizing fingerprints of portable devices comprises the following steps: preparing a fingerprint recognizing sensor; molding a first injection-molded product equipped with an accommodating groove in which the fingerprint recognizing sensor is settled and molding holds vertically penetrating through the inner part of the accommodating groove of the first injection-molded product (S100); settling the fingerprint recognizing sensor in the accommodating groove; and secondly injecting the home key recognizing the fingerprints by using the first injection-molded product in which the fingerprint recognizing sensor is attached and forming the center of the upper surface of a second injection-molded product to be recessed in comparison with the circumference (S200). [Reference numerals] (AA) Start; (BB) End; (S100) First injection; (S200) Secondly injecting the home key recognizing the fingerprints so that the shape of the upper surface of a final injection-molded product where the fingerprint recognizing sensor is attached is recessed in comparison with the circumference; (S300) Spreading a primer; (S400) Forming a shielding layer; (S500) Painting; (S550) Urethane coating; (S600) UV top coating