Method and apparatus for separating dummy disc from multi-layer substrate for optical storage medium
View Patent ↗A method and an apparatus which can be used for separating a dummy disc from a substrate in a process for manufacturing multi-layer optical storage discs are provided.
1. A method for separating a dummy disc from a subject disc, said method including:
placing onto a disc carrier a subject disc bearing a dummy disc adhering to a first surface of said subject disc, wherein an outer portion of the subject disc is permitted to flex;
applying a force to two opposing points on an exposed surface of said dummy disc until the dummy disc flexes in a first direction and subsequently breaks, and then removing said force;
applying vacuum through a first suction device to two locations of a second surface of the subject disc opposite the first surface of said subject disc, to flex the subject disc in a second direction approximately 90° to said first direction; and
applying vacuum through a second suction device to the exposed surface of said dummy disc and moving the dummy disc in a direction away from the subject disc.
2. The method of claim 1 , further comprising removing the vacuum from the second suction device and allowing the subject disc to flex back to a resting position of the subject disc.
3. A method for manufacturing multi-layer optical storage media, the method comprising:
(a) molding a substrate including an information bearing side and applying a first reflective layer over the information-bearing side of the substrate;
(b) molding a dummy disc and applying a second reflective layer over the dummy disc;
(c) applying an adhesive resin over said first reflective layer;
(d) forming a subject disc by applying a side of the dummy disc bearing said second reflective layer onto said adhesive resin; and
(e) placing onto a disc carrier the subject disc wherein an outer portion of the subject disc is permitted to flex;
(f) applying a force to two opposing points on an exposed surface of said dummy disc until the dummy disc flexes in a first direction and subsequently breaks, and then removing said force;
g) applying vacuum through a first suction device to two locations of a second surface of the substrate opposite the information-bearing side of the substrate, to flex the subject disc in a second direction approximately 90° to said first direction; and
(h) applying vacuum through a second suction device to the exposed surface of said dummy disc and moving the dummy disc in a direction away from the subject disc.
4. The method of claim 3 , further comprising:
applying a protective cover layer over said second reflective layer of said subject disc.
5. An apparatus for separating a dummy disc from a subject disc bearing the dummy disc adhering to a first surface of said subject disc, said apparatus including:
a disc carrier configured to support a central portion of the subject disc while allowing an outer portion of the subject disc to flex;
a pair of force applying members configured to move in a first direction towards an exposed surface of said dummy disc to apply a force to two opposing points on the exposed surface of said dummy disc until the dummy disc flexes in a first direction and subsequently breaks, and then move in a second direction to remove said force;
a first suction device configured to apply vacuum to two locations of a second surface of the subject disc opposite the first surface of said subject disc, to flex the subject disc in a second direction approximately 90° to said first direction; and
a second suction device configured to apply vacuum to the exposed surface of said dummy disc and moving the dummy disc in a direction away from the subject disc.