Method of manufacturing an electrostatic capacitance type information signal recording medium

A method of manufacturing an electrostatic capacitance type information signal recording disc, and method comprising the steps of:

• (a) simultaneously but separately extrusion forming first and second sheets, said first sheet being a continuous sheet made of a conductive material, said second sheet being a continuous sheet made of another conductive material and having a thickness of approximately 0.01 mm to 0.05 mm, said conductive material used for said first sheet being an inexpensive material compared to said other conductive material used for said second sheet;
• (b) binding said second sheet on at least one surface of said first sheet by use of binding means, said binding means comprising heating rollers for heating said first and second sheets up to a predetermined temperature and binding said first and second sheets with a predetermined pressure so as to obtain a continuous laminated sheet, said first sheet being used as a core material and having a thickness which is approximately 100 to 23 times the thickness of said second sheet so that said continuous laminated sheet has a predetermined thickness, said heating rollers being directly supplied with said first and second sheets which are formed in said step (a);
• (c) cutting said laminated sheet into a plurality of laminated plates having a predetermined size which corresponds to the size of said electrostatic capacitance type information signal recording disc;
• (d) pre-heating each of said laminated plates so as to obtain a pre-heated laminated plate;
• and
• (e) compression molding variations in geometrial configuration, in accordance with information signals which are to be recorded, on a recording part of said second sheet of said pre-heated laminated plate supplied.