Patent ID: 7438547

Claim:
An apparatus for manufacturing a master for manufacturing optical recording medium where a groove and plural pits formed and arranged dispersedly in a circumference direction, are formed on a substrate, the apparatus comprising: a first beam splitter configured to divide a single exposure beam supplied from a light source into first and second beams; a pit modulation unit configured to pit-modulate the first beam to produce a pit-modulated beam; a pit exposure unit configured to form a latent image for forming the pits by irradiating a surface of the master with the pit-modulated beam; a wobble deflecting unit configured to optically deflect the second beam for wobbling to produce a wobble beam; a second beam splitter configured to divide the wobble beam into plural exposure beams; and a groove exposure unit configured to form a latent image for forming the groove which has a U-shaped cross section and a depth shallower than a depth of the pits on the surface of the master by arranging the plural exposure beams from the second beam splitter to be aligned at certain widths in the radius direction of the master with a polarization beam splitter, and irradiating an exposure beam with a spot wider in the radius direction of the master than that of the single exposure beam to the surface of the master.