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US 5,077,120 AGranted
Optical disk
AssigneePioneer Electronic Corporation
InventorsHiroshi Kato, Masataka Uchidoi, Masaomi Ebe
Life of this patent
Estimating the term…
Abstract
An optical disk is provided with a protective layer which is an adhesive which is non-tacky at room temperature in the case of a one sided disk; and which is useful as a tacky adhesive at room temperature in the case of a two sided disk made from two one-sided disks bonded to one another.
Claims14
A method of manufacturing an optical disk, comprising the steps of:
- preparing a synthetic resin disk substrate having signal pits formed on one surface thereof,
- forming a reflecting film layer over said signal pits,
- conveying said disk substrate,
- heating a hot-melt type filming agent,
- coating said heated and melted hot-melt type filming agent on said reflecting film layer,
- solidifying said filming agent coated on said reflecting film layer to form a protective coating for said reflecting film layer, wherein said hot-melt type filming agent is not a solvent-type adhesive that affects and erodes said synthetic resin disk substrate, and
- bonding two said disk substrates with an adhesive material after said solidifying of said filming agent, wherein said adhesive material comprises a hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes the synthetic resin disk substrate and which maintains its adhesive properties at room temperature,
- wherein said adhesive material has a composition comprising the following components in the following approximate weight proportions:
- ______________________________________ Approximate weight proportion ______________________________________ Block polymer 100 Plasticizer 0 to 100 Tackifier 100 to 600. ______________________________________
6 more elements
A method of manufacturing an optical disk, comprising the steps of:
- preparing a synthetic resin disk substrate having signal pits formed on one surface thereof,
- forming a reflecting film layer over said signal pits,
- conveying said disk substrate,
- heating a hot-melt type filming agent,
- coating said heated and melted hot-melt type filming agent on said reflecting film layer,
- bonding two said disk substrates through said filming agent, and
- solidifying said filming agent to thereby form two protective coatings bonded together wherein said hot-melt type filming agent is an adhesive material which is not a solvent-type adhesive that affects and erodes the synthetic resin disk substrate and which maintains its adhesive properties at room temperature,
- wherein said adhesive material has a composition comprising the following components in the following approximate weight proportions:
- ______________________________________ Approximate weight proportion ______________________________________ Block polymer 100 Plasticizer 0 to 100 Tackifier 100 to 600. ______________________________________
6 more elements
A method of manufacturing an optical disk, comprising the steps of:
- preparing a synthetic resin disk substrate having signal pits formed on one surface thereof,
- forming a reflecting film layer over said signal pits,
- coating a first adhesive material on said reflecting film layer by a roll coater,
- solidifying said first adhesive material coated on said reflecting film layer to form a protective coating for said reflecting film layer, wherein said first adhesive material is a hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes said synthetic disk substrate, and
- bonding two said disk substrates having said protective coating with a second adhesive material, said second adhesive material comprising a hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes the synthetic resin disk substrate and which maintains its adhesive properties at room temperature,
- wherein said second adhesive material has a composition comprising the following components in the following approximate weight proportions:
- ______________________________________ Approximate weight proportion ______________________________________ Block polymer 100 Plasticizer 0 to 100 Tackifier 100 to 600. ______________________________________
4 more elements
An optical disk comprising:
- a first disk-shaped substrate formed of a synthetic resin and having an information bearing surface on which signal pits are formed,
- a second disk-shaped substrate formed of a synthetic resin and having an information bearing surface on which signal pits are formed,
- a reflective layer overlying the information bearing surface of each of said first and second disk-shaped substrates,
- a protective coating overlying each of said reflective layers,
- said protective coatings comprising a solidified hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes said synthetic resin disk substrates and which maintains adhesive properties at room temperature, and
- means for joining together said protective layers in a facing adjacent relationship, wherein said joining means is adhesive material comprising a solidified hot-melt type filming agent which is not a solvent type adhesive which affects and erodes said synthetic resin disk substrates, and which maintains adhesive properties at room temperature,
- wherein said adhesive material has a composition comprising the following components in the following approximate weight proportions:
- ______________________________________ Approximate weight proportion ______________________________________ Block polymer 100 Plasticizer 0 to 100 Tackifier 100 to 600. ______________________________________
5 more elements
An optical disk comprising:
- a first disk-shaped substrate formed of a synthetic resin and having an information bearing surface on which signal pits are formed,
- a second disk-shaped substrate formed of a synthetic resin and having an information bearing surface on which signal pits are formed,
- a reflective layer overlaying the information bearing surface of each of said first and second disk-shaped substrates,
- a protective coating overlying each of said reflective layers,
- said protective coatings comprising a solidified hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes said synthetic resin disk substrates, and which does not maintain adhesive properties at a room temperature, and
- means for joining together said protective layers in a facing adjacent relationship, said joining means comprising an adhesive material comprising a solidified hot-melt type filming agent which is not a solvent-type adhesive that affects and erodes the synthetic resin disk substrates and which maintains adhesive properties at room temperature,
- wherein said adhesive material has a composition comprising the following components in the following approximate weight proportions:
- ______________________________________ Approximate weight proportion ______________________________________ Block polymer 100 Plasticizer 0 to 100 Tackifier 100 to 600. ______________________________________
5 more elements
Dependencies are inferred from the claim text.