To produce an information recording carrier whose eccentric quantity is small with high productivity by allowing a process providing a projection on the master disk of the information recording carrier to be included in the manufacturing process of the information recording carrier.
In the master disk 1 of the information recording carrier, material in which various kinds of materials such as silicon, quartz, glass, resin and so forth are worked is used. Raggedness shapes of grooves and pits or the like are formed on the surface of the master disk 1 by a technique applying an etching processing while forming a resist mask with a known photolithography technology. Moreover, a projection 2 is provided on the surface of the master disk 2. The shape of the projection is decided by the shape of a disk substrate. The disk substrate is positioned by energizing the inner diameter of the center hole of the substrate with the outer diameter of the projection. Consequently, since the eccentric quantity of the disk is changed by the clearance between the inner diameter of the center hole of the disk substrate and the outer diameter of the projection, the clearance is decided in accordance with an eccentric quantity to be required.
NISHIKAWA HISAO
NEHASHI SATOSHI
Next Patent: INFORMATION REPRODUCING DEVICE