Method of manufacturing an image drum

A method of manufacturing an image drum for selectively adsorbing a toner thereon so as to form an image in a printing apparatus, the method comprising:

• providing a hollow cylindrical mold having a plurality of mold grooves circumferentially cut in its inner circumferential surface;
• providing a core portion inserted into the mold and having a combination groove in a longitudinal direction;
• providing a control unit provided inside of the core portion and utilizing an FPCB;
• filling a conductive material into the plurality of mold grooves of the mold;
• providing a control unit guide in an end of the control unit;
• inserting the control unit mounted with the control unit guide into the combination groove;
• inserting the core portion mounted with the control unit into the hollow of the mold;
• and
• forming a drum body to be integrally formed with the control unit and the conductive material, by filling a molten plastic in an opening between the mold and the core portion.

A method of manufacturing an image drum for selectively adsorbing a toner thereon so as to form an image in a printing apparatus, the method comprising:

• providing a hollow cylindrical mold having a plurality of mold grooves circumferentially cut in its inner circumferential surface;
• providing a core portion having a smaller diameter than a hollow of the mold, and having a slit-shaped combination groove;
• filling a conductive material into the plurality of mold grooves of the mold;
• including a control unit which individually applies a voltage to each terminal of a plurality of terminals and is formed by using a PCB;
• combining the control unit into the combination groove, so that the control unit is partially exposed from an outside of the core portion;
• forming a drum body to be integrally formed with the control unit and the conductive material, by initially inserting the core portion into the hollow of the mold and filling a molten plastic into a space between the mold and the core portion;
• forming an insulating layer in a portion of the mold to contact a surface of the control unit;
• forming a connection hole which corresponds to each ring electrode of a plurality of ring electrodes formed in the drum body, on the insulating layer;
• and
• electrically connecting each ring electrode of the plurality of ring electrodes and the control unit via the connection hole.