Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A method of manufacturing an optical data storage disk in which two similar disk members are secured in back-to-back relationship, which comprises the steps of: (a) positioning the disk members in the desired back-to-back relationship and concentric with one another; (b) effecting a first bond between the disk members close to their centres; and (c) effecting a second bond between the disk members at or close to their periphery, at least one of said first and second bonds being effected by means of a resilient bonding arrangement, whereby the tendency of the disk to vibrate is reduced.
Claim 2
Independent Claim
97 words
A method of manufacturing an optical data storage disk in which two similar disk members are secured in back-to-back relationship, which comprises the steps of: (a) positioning the disk members in the desired back-to-back relationship and concentric with one another; (b) effecting a first bond between the disk members close to their centres; and (c) effecting a second bond between the disk members at or close to their periphery, at least one of said first and second bonds being effected by means of a resilient bonding arrangement, whereby the tendency of the disk to vibrate is reduced.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein said second bond is a resilient bond.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein each of said first and second bonds is a resilient bond.
Claim 5
Dependent Claim
14 words
A method according to claim 1, wherein said first bond is a rigid bond.
Claim 6
Dependent Claim
26 words
A method according to claim 4, wherein said adhesive for generating said first bond is of the type curable by ultra-violet light or by ultrasonic welding.
Claim 7
Dependent Claim
13 words
A method according to claim 5, wherein said adhesive is an epoxy resin.
Claim 8
Independent Claim
139 words
A method according to any preceding claim, wherein the first and second disk members are centred prior to effecting said first bond between them by a method comprising: holding the disks mutually parallel in opposed relationship and spaced apart by a distance in the range 0.2 to 1.5 millimeters; directing a coherent or non-coherent beam of light uniformly over a predermined area of the disks where each of the disks carries regularly arranged grooves the pitch (period) of which is in the range 15 to 50 microns; and observing the intensity of light transmitted through both disks at three or more locations which are equidistant from the axis of location of the disks; and adjusting the relative position of the disks about said axis of location until the measured intensities at each of the observing stations are the same.
Claim 9
Independent Claim
125 words
A method of determining whether two similar optical disks are located concentrically, which comprises holding the disks mutually parallel in opposed relationship and spaced apart by a distance in the range 0.2 to 1.5 millimeters; directing a coherent or non-coherent beam of light uniformly over a predermined area of the disks where each of the disks carries regularly arranged grooves the pitch (period) of which is in the range 15 to 50 microns; and observing the intensity of light transmitted through both disks at three or more locations which are equidistant from the axis of location of the disks; and adjusting the relative position of the disks about said axis of location until the measured intensities at each of the observing stations are the same.
Claim 10
Independent Claim
125 words
A method of determining whether two similar optical disks are located concentrically, which comprises holding the disks mutually parallel in opposed relationship and spaced apart by a distance in the range 0.2 to 1.5 millimeters; directing a coherent or non-coherent beam of light uniformly over a predermined area of the disks where each of the disks carries regularly arranged grooves the pitch (period) of which is in the range 15 to 50 microns; and observing the intensity of light transmitted through both disks at three or more locations which are equidistant from the axis of location of the disks; and adjusting the relative position of the disks about said axis of location until the measured intensities at each of the observing stations are the same.