Optical information medium, and method and apparatus for fabricating the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHisaki Miyamoto, Michiyoshi Nagashima, Kiyoshi Inoue, Sakae Noda
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Abstract
The disk-shaped optical information medium of this invention includes: a first substrate having a center hole; a second substrate having a center hole; and a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates, wherein the optical information medium further includes a stopper for preventing the radiation curable resin from protruding into the center holes of the substrates, and a space between the first and second substrates of at least a half of a clamp region for clamping the optical information medium is filled with the resin.
Claims46
A disk-shaped optical information medium comprising:
- a first substrate having a center hole;
- a second substrate having a center hole;
- and
- a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates,
- wherein the optical information medium further comprises a stopper for preventing the radiation curable resin from protruding into the center holes of the substrates, and
- a space between the first and second substrates of at least a half of a clamp region for clamping the optical information medium is filled with the resin.
A disk-shaped optical information medium comprising:
- a first substrate having a center hole;
- a second substrate having a center hole;
- and
- a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates,
- wherein the optical information medium further comprises a ring-shaped groove substantially concentric with the center holes of the substrates, formed on at least one of the first and second substrates at a position closer to the center holes with respect to the center of a clamp region for clamping the optical information medium, and
- a space between the first and second substrates of at least a half of the clamp region is filled with the radiation curable resin.
An optical information medium comprising a first substrate having a center hole, a second substrate having a center hole, and a radiation curable resin interposed between the first and second substrates to integrate the first and second substrates, wherein the radiation curable resin does not exist in a region adjacent to the center holes of the first and second substrates.
A disk-shaped optical information medium comprising:
- a first substrate having a center hole;
- a second substrate having a center hole;
- and
- a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates,
- wherein an outer circumference of at least one of the first and second substrates is tapered.
A disk-shaped optical information medium comprising:
- a first substrate having a center hole;
- a second substrate having a center hole;
- and
- a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates,
- wherein the radiation curable resin has a weather-resistance pigment mixed therein.
A disk-shaped optical information medium comprising:
- a first substrate having a center hole;
- a second substrate having a center hole;
- and
- a radiation curable resin interposed between the first and second substrates for bonding together the first and second substrates,
- wherein the radiation curable resin comprises a resin of which color density varies with the level of the curing of the resin.
A method for fabricating an optical information medium, comprising the steps of:
- forming a pair of substrates each having a center hole;
- placing one of the pair of substrates on the other substrates with a radiation curable resin interposed therebetween;
- and
- curing the radiation curable resin by irradiating the resin with radioactive rays capable of passing through at least one of the pair of substrates so as to bond the pair of substrates together,
- wherein the step of forming a pair of substrates includes the step of forming a stopper for preventing the radiation curable resin from protruding into the center holes on at least one of the pair of substrates, and
- the step of placing one of the pair of substrates on the other substrate includes the step of filling at least a half of a clamp region of the optical information medium with the radiation curable resin.
A method for fabricating an optical information medium, comprising the steps of:
- forming a pair of substrates each having a center hole;
- placing one of the pair of substrates on the other substrates with a radiation curable resin interposed therebetween;
- and
- curing the radiation curable resin with radioactive rays capable of passing through at least one of the pair of substrates so as to bond together the pair of substrates,
- wherein the step of placing one of the pair of substrates on the other substrate includes the step of disposing the radiation curable resin so that the resin is away from the center holes of the substrates.
A method for fabricating an optical information medium, comprising the steps of:
- forming a pair of substrates each having a center hole;
- placing one of the pair of substrates on the other substrates with a radiation curable resin interposed therebetween;
- and
- curing the radiation curable resin with radioactive rays capable of passing through at least one of the pair of substrates so as to bond together the pair of substrates,
- wherein, in the step of forming a pair of substrates an outer circumference of at least one of the pair of substrates is tapered.
A method for fabricating an optical information medium comprising the step of bonding a first substrate having a center hole and a second substrate having a center hole with a radiation curable resin interposed therebetween,
- wherein a sealant layer is formed of another radiation curable resin on a portion of one of the substrates closer to an inner circumference of the substrate, the viscosity of the another radiation curable resin when it is not cured being higher than that of the radiation curable resin for bonding formed on a portion of the substrate closer to an outer circumference of the substrate, and the radiation curable resins are cured by radioactive rays passing through the first or second substrate to bond together the first and second substrates.
A method for fabricating an optical information medium comprising the step of bonding a first substrate having a center hole and a second substrate having a center hole with a radiation curable resin interposed therebetween,
- wherein a sealant layer is formed by printing a radiation curable resin on a portion of one of the substrates closer to an inner circumference of the substrate, and the radiation curable resins are cured by radioactive rays passing through the first or second substrate to bond together the first and second substrates.
A method for fabricating an optical information medium comprising the step of bonding a first substrate having a center hole and a second substrate having a center hole with a radiation curable resin interposed therebetween,
- wherein a sealant layer is formed of a hot melt adhesive on a portion of one of the substrates closer to an inner circumference of the substrate, the first and second substrates are pressed with the radiation curable resin and the sealant layer being interposed therebetween, and the radiation curable resin is cured by radioactive rays passing through the first or second substrate to bond together the first and second substrates.
A method for fabricating an optical information medium comprising the step of bonding together a first substrate having a center hole and a second substrate having a center hole with a radiation curable resin interposed therebetween,
- wherein a portion of the radiation curable resin protruding into the center holes is removed before the radiation curable resin is cured.
A method for fabricating an optical information medium, comprising the steps of:
- placing one of a pair of substrates, each having a center hole, on the other substrate with a radiation curable resin interposed therebetween;
- and
- curing the radiation curable resin with radioactive rays capable of passing through at least one of the pair of substrates so as to bond together the pair of substrates,
- wherein a resin of which color density varies with the degree of the curing of the resin is used as the radiation curable resin, the color density of the resin is measured when the resin is irradiated with radioactive rays, and the curing of the resin is terminated when the resin obtains a predetermined color density.
A method for fabricating an optical information medium comprising the step of bonding a first substrate and a second substrate with a radiation curable resin interposed therebetween,
- wherein radioactive rays passing through the first substrate and radioactive rays passing through the second substrate radiate the radiation curable resin so as to cure the radiation curable resin.
Dependencies are inferred from the claim text.