Disk type recording medium

Details Disk type recording medium Disk type recording medium

G - Physics

11

B

G11B 25/00 (2006.01) G11B 7/24 (2006.01) G11B 11/10 (2006.01)

Patent

CA 2173421

A recording film is coated and formed on a glass substrate. A protection substrate is adhered to the glass substrate to cover the recording film. A protection rib is formed as a body with the protection substrate so as to face an outer circumference edge of the glass substrate. Since the external shock is not given directly to the glass substrate by the protection rib, the glass substrate 1 can be protected. Thus, the glass substrate would not be cracked or damaged easily.

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