Light exposure apparatus for master optical disc

A device for exposing portions of photoresist on a master disk to a laser light in registry with a pre-set pattern of recording information signals, the device comprising:

• a laser light source;
• a laser light adjustment device located downstream of the laser light source and configured to adjust the spot diameter of the laser light and to control whether a beam emitted from the source is transmitted or not;
• a laser illuminating unit located downstream of the laser light adjustment device, the laser illuminating unit comprising:
• a first lens positioned downstream of a laser light source for imaging laser light from the source onto a focal length point;
• a deflector located downstream of the first lens but upstream of the focal length point of the first lens, the deflector serving to wobble the laser light diffracted from the first lens;
• a lens system located downstream of the deflector and configured to re-image the laser light emitted from the deflector, an objective lens positioned downstream of the lens system to image the laser light on the master disk;
• and
• a controller operatively coupled to both the laser adjustment device and the deflector to control adjustment of the laser light spot diameter and the wobble of the laser light, respectively.