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AssigneeTaiyo Yuden Co., Ltd.
InventorsMotomitsu Hagiwara, Takeshi Otsu, Akimasa Miyata, Kuniyuki Aihara
Estimating the term…
A stamper is mounted to a surface of at least one of a stationary-side die and a movable-side die. A transfer surface of the stamper is positioned substantially flush with a first surface of an inner peripheral holding member for holding the stamper near an inner periphery thereof which first surface is positioned adjacent to the transfer surface of the stamper. A first distal end of the inner peripheral holding member, which is positioned to face the cavity, and a second distal end of a die member, which is positioned to face the cavity, the die member being disposed adjacent to the inner peripheral holding member, are both projected more into the cavity than the transfer surface of the stamper. A molding burr can be suppressed from projecting upward from the vicinity of an inner peripheral edge of the substrate surface substantially flush with the transfer portion.
A molding die apparatus for molding a disk-shaped substrate having a center hole, comprising:
An optical disk comprising a disk-shaped substrate having a center hole, the substrate comprising a transfer portion, a first recessed portion adjacent to an inner periphery of the transfer portion, and a second recessed portion adjacent to an inner periphery of the first recessed portion, wherein the transfer portion comprises a first surface with guide grooves or pits formed therein, wherein the first recessed portion and the second recessed portion are recessed relative to the first surface of the transfer portion, and wherein the first recessed portion and the second recessed portion are separated by a molding burr formed at the inner periphery of the first recessed portion, said molding burr having a height which is less than the depth of the recessed portions.
A method of improving contact between an optical disk and a center cap attached to said optical disk during a spin coating process, the method comprising recessing a central region of said optical disk such that a molding burr in the recessed region has insufficient height to contact said center cap when said center cap is engaged with said optical disk.
Dependencies are inferred from the claim text.