Radio tag antenna structure for an optical recording medium and a case for an optical recording medium with a radio tag antenna
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[0067] According to the first embodiment, as shown in FIGS. 1(A) and 1(B), a recess (space)111 is formed in a part of the region of the dielectric substrate 11 (11A) forming the printing surface (label surface: surface on which the laser beam is not irradiated) opposite to the writing / reading surface [the lower side on the drawing in FIG. 1(B)] of the DVD 1 to accommodate a radio tag comprised of a patch antenna (flat antenna) 2 and a minute IC chip (not less than 1 mm square, for example: not shown) therein. The patch antenna 2 is accommodated in and fixed to the recess together with the IC chip (communication circuit chip). Hereinafter, the patch antenna 2 will signify the whole radio tag including the patch antenna 2 and the IC chip, occasionally.
[0068] The recess 111 has a depth equal to the thickness of the dielectric layer 11A (that is, such a depth that a part of the reflective layer 12A is exposed) or smaller than the same (a depth not reaching to the reflective layer 12A) a
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(B) Description of Second Embodiment
[0098] FIGS. 7(A) and 7(B) are diagrams for illustrating a radio tag antenna structure for an optical recording medium according to a second embodiment of this invention. FIG. 7(A) is a schematic plan view of a CD as being an optical recording disk medium, whereas 7(B) is a schematic sectional view taken along line A-A of the CD shown in FIG. 7(A).
[0099] As shown in FIGS. 7(A) and 7(B), the CD 3 is sized to have an inside diameter of 1.5 cm, an outside diameter (diameter) of 12 cm and a thickness of 0.6 mm. Generally, a reflective layer (metal layer) 12 is formed on one surface of a dielectric substrate (dielectric layer) 11, and a protective layer 14 is further formed thereon, as shown in FIG. 7(B). In FIGS. 7(A) and 7(B), illustration of a recording layer on which information is recorded is omitted.
[0100] In this embodiment, the dielectric substrate 11 also functions as a protective layer for protecting the reflective layer 12 and the recording
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