Disk medium with antenna and method for manufacturing the same

A disk medium having mounted thereon an IC chip capable of receiving and delivering information from and to an external source without contact:

• wherein the disk medium includes a metal film area and a non-film area formed by separating the metal film area;
• wherein the non-film area is a substantially annular slot arranged in the neighborhood substantially equidistant from the central hole;
• and
• wherein predetermined points of the small inlet including the IC chip are connected electrically or by capacitance coupling to the metal films of the metal film area over the non-film area.

A seal comprising an inlet including an IC chip and a small antenna and an antenna,

• wherein the inlet and the antenna are fixed on the seal;
• wherein a substantially annular slot making up a non-film area is formed between the antenna and the metal film area of the disk medium;
• and
• wherein the inlet connects the antenna and the metal film of the metal film area of the disk medium by capacitance coupling to each other.

A method of manufacturing a disk medium having mounted thereon a small inlet including a small antenna having a slit for impedance matching between an IC chip and an antenna, comprising the steps of:

• forming a substantially annular slot constituting a non-film area not formed with a metal film from the metal film area formed in the disk medium;
• coating an anisotropic conductive film at the portions of the metal film formed in the disk medium and corresponding to the positions at which predetermined points of the small antenna are electrically connected over the substantially annular slot;
• and
• arranging the body of the small inlet in the substantially annular slot and connecting the predetermined points to the portions coated with the anisotropic conductive film.