Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A radiation-sensitive record disc, comprising: a first substrate 1 having a recording layer 2 formed thereon; a second substrate 6 coaxially positioned with said first substrate 1, and adjacent said recording layer 2, to form an air space 5 therebetween; characterised by means 8-14 coupled to said air space 5 for equalizing the pressure between the air space 5 and the air surrounding the disc.
Claim 2
Dependent Claim
65 words
A radiation-sensitive record disc, comprising: a first substrate 1 having a recording layer 2 formed thereon; a second substrate 6 coaxially positioned with said first substrate 1, and adjacent said recording layer 2, to form an air space 5 therebetween; characterised by means 8-14 coupled to said air space 5 for equalizing the pressure between the air space 5 and the air surrounding the disc.
Claim 3
Dependent Claim
58 words
A radiation-sensitive record disc as claimed in claim 1 wherein the pressure equalizing means 8-14 has a pressure sensitive expansible means 3 which is arranged with a first surface coupled to said air space 5 and a second surface coupled to said surrounding air so as to allow for equalizing the pressure on the first and second surfaces.
Claim 4
Dependent Claim
36 words
A radiation-sensitive record disc as claimed in claim 2 wherein said pressure equalizing means 8-14 has an inner venting means 10 coupled to said air space 5 and said first surface for permitting fluid communication therebetween.
Claim 5
Dependent Claim
34 words
A radiation-sensitive record disc as claimd in claim 3 wherein said pressure equalizing means has an outer venting means 14 coupled to the surrounding air and said second surface for permitting fluid communication therebetween.
Claim 6
Dependent Claim
20 words
A radiation-sensitive record disc as claimed in any preceding claims wherein said first substrate 1 is a transparent plastic substrate.
Claim 7
Dependent Claim
24 words
A radiation-sensitive record disc as claimed in any preceding-claims wherein said second substrate is a transparent plastic substrate having the recording layer formed thereon.
Claim 8
Dependent Claim
39 words
A radiation-sensitive record disc as claimed in claim 2, 3 or 4 wherein said equilibrium means has a cavity having a first portion and a second portion, said first portion separated from said second portion by said expansible means.
Claim 9
Dependent Claim
53 words
A radiation-sensitive record disc as claimed in claim 3 wherein spacer means 3 is provided between the first and second substrates, the spacer means 3 comprising an annular plate having spaced grooves 12 concentrically provided on its surface to permit fluid communication between said air space 5 and said inner venting means 10.
Claim 10
Dependent Claim
41 words
A radiation-sensitive record disc as claimed in claim 8 wherein said spacer means 3 has a notch 11 passing through said plate, adjacent its circumferential edge, for permitting fluid communication between said air space 5 and said inner venting means 10.