Patent ID: 6211900
Filing Date: 2001-04-03
Classification: B23K,G11B

Abstract:
A recording apparatus for exposing a resist master disk to a recording laser light through a recording lens which has been set at an optimum focusing position, comprising:displaceable laser light detector for receiving a focusing laser light which has been applied to and reflected from said resist master disk during initial setting of the optimum focusing position, and for producing a detection signal indicative of an amount of deviation, from a predetermined light receiving position, of a light receiving position where a reflected focusing laser light is received;a servo responsive to said detection signal so as to automatically adjust a relative position of said recording lens with respect to said resist master disk in such a manner as to eliminate said deviation, thereby setting the recording lens at the optimum focusing position;displacement amount detector for detecting an amount of displacement of said laser light detector; anda display for changing an output from said displacement amount detector into numerical values and displaying the numerical values.