US 2003/0141003 A1 · Multilayer disc manufacturing apparatus and multilayer disk bonding method

Abstract

There are provided a multilayer disc manufacturing apparatus and method, capable of computing a rotational eccentricity of a disc with no contact with the disc and a high accuracy, and producing the disc with less costs without having to rotate the disc or any complicated operations. The multilayer disc manufacturing apparatus (100) is a one for manufacturing a multilayer disc by bonding one disc (220) to another disc (210). The apparatus includes means for fixing, in place, one (220) of the discs which form together a multilayer disc, means (150) for projecting a light onto a boundary (223) between an embossed signal recording area (221) and non-signal recording area on the one disc (220) fixed in place, means (140) for capturing a return light from the boundary (223) illuminated with the light projected from the light projecting means (150), means (131) for positioning the center of a signal recording area on the other disc (210) and means (110) for varying the position of the centering means (131) in relation to the disc fixing means.

Claims10

Dependent claims

(Amended) an apparatus for manufacturing a multilayer disc by bonding one disc to another disc, the apparatus comprising:

means for separating the one and other discs from each other and supporting the other disc at the outer circumference to cause a clearance between the discs;
means for positioning the center of a signal recording area on the other disc in relation to a reference position;
multiple means for projecting a light onto a boundary between an embossed signal recording area and non-signal recording area on the one disc fixed in place;
multiple means for capturing a return light from the boundary illuminated with the light projected from the light projecting means;
means for computing an eccentricity error of the one disc from the reference position based on a positional information as to the boundary, acquired by the return light capturing means;
means for varying the position of the one disc in relation to the centering means to allow the eccentricity error of the one disc, computed by the computing means;
and
means for bonding the one and other discs to each other with them being put into sequential contact with each other from the center toward the outer circumference of them.

5 more elements

(Amended) A method for manufacturing a multilayer disc by bonding one disc to another disc, the method including steps of:

separating the one and other discs from each other and supporting the other disc at the outer circumference to cause a clearance between the discs;
projecting, by multiple light projecting means, a light onto a boundary between an embossed signal recording area and non-signal recording area on the one disc fixed in place;
capturing, by multiple return light capturing means, a return light from the boundary illuminated with the light projected from the multiple light projecting means;
determining the center of the signal recording area on the one disc based on a positional information as to the signal recording area, acquired in the return light capturing step;
moving means for varying the relative position of means for positioning the center of the signal recording area on the other disc in relation to the one disc in order to align the center of the signal recording area of the one disc, determined in the area center determining step, with the centering means in relation to a reference position;
and
bonding the one disc and other disc to each other with them being put into sequential contact with each other from the center toward the outer circumference of them.

4 more elements

Dependencies are inferred from the claim text.

Multilayer disc manufacturing apparatus and multilayer disk bonding method

Life of this patent

Multilayer disc manufacturing apparatus and multilayer disk bonding method

Life of this patent

Abstract

Claims10