US 7,740,729 B1 · Method and system for controlling the eccentricity of bonded multiple optical discs

Abstract

Techniques for bonding two disks with a minimized eccentricity (ECC) are disclosed. A positioning header includes an ECC controlling structure that further includes a positioning header. In one embodiment, the position header includes three members that form a round stand with a diameter smaller than the inner diameter of the disks. The round stand expands to the inner diameter of the disks to close the gap as a result of the difference between the two diameters when the three members are caused to expand. In one embodiment, the movement of the three members is controlled by magnetic means. Depending on the positions of the ECC controlling structure, the three members are expanded from or restored to their default positions.

Claims20

Dependent claims

A method for bonding at least two disks, the method comprising:

providing a bounding structure including a positioning header with a number of members and first magnetic means, where the members, when in default positions, form a default round stand with a first diameter smaller than a second diameter;
placing two disks with the second diameter on the positioning header, wherein the two disks have been already applied a layer of a type of adhesive therebetween;
and
causing the members to expand up to a limit by the second diameter, by magnetic effects between the first and second magnetic means when the bounding structure is moved over the second magnetic means so that a gap caused by a difference between the first diameter and the second diameter is minimized while the two disks are being bonded, thereby an eccentricity of the bonded two disks is minimized.

1 more element

Dependencies are inferred from the claim text.

Method and system for controlling the eccentricity of bonded multiple optical discs

Life of this patent

Method and system for controlling the eccentricity of bonded multiple optical discs

Life of this patent

Abstract

Claims20