Optical information recording disk
First Claim
1. An optical information recording disk comprising:
- a pair of substrates at least one of which has a signal recording layer formed thereon;
spacer means for bearing circumferential portions of said substrates on first and second substrate bearing surfaces of said spacer means so that said substrates together with said spacer means form an interior space;
means for fixedly joining said substrates and said spacer means by heating the disk;
means for defining a notched portion in one of said first and second substrate bearing surfaces of said spacer means so that said notched portion extends through said spacer means to communicate the interior space with atmosphere outside the disk; and
seal means for filling in said notched portion after said disk has been heated to form an airtight seal.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical information recording disk is formed by a pair of disk-like substrates with an inner and an outer annular spacer member disposed therebetween. The inner spacer member supports an inner circumferential portion of each of the disk-like substrates, and the outer spacer member supports an outer circumferential portion of each of the disk-like substrates. The spacer members and substrates thus define an interior space. The spacer members and substrates are fixed together by means of a thermosetting adhesive agent. A notched portion is formed in at least one of the space members so as to communicate the interior of the disk with the ambient atmosphere. Thus, during heating of the disk for purposes of joining the substrates and spacers by hardening the adhesive agent, air in the interior space in the disk can escape through the notched portion. After heating, the notched portion is filled with a sealing member such as a solid member or another adhesive agent.
-
Citations
18 Claims
-
1. An optical information recording disk comprising:
-
a pair of substrates at least one of which has a signal recording layer formed thereon; spacer means for bearing circumferential portions of said substrates on first and second substrate bearing surfaces of said spacer means so that said substrates together with said spacer means form an interior space; means for fixedly joining said substrates and said spacer means by heating the disk; means for defining a notched portion in one of said first and second substrate bearing surfaces of said spacer means so that said notched portion extends through said spacer means to communicate the interior space with atmosphere outside the disk; and seal means for filling in said notched portion after said disk has been heated to form an airtight seal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for forming an optical information recording disk comprising the steps of:
-
disposing first and second substrates on, and joining the substrates to, respective first and second substrate bearing surfaces of spacer means for maintaining a predetermined distance between said substrates, said spacer means having a notched portion defined in at least one of said first and second substrate bearing surfaces, said notched portion extending through said spacer means so as to communicate an interior space formed by said substrates and spacer means with a space outside of the disk, wherein said substrates are joined to said spacer means by heating the disk; and sealing said notched portion to form an airtight seal after the heating. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification