Method and apparatus of measuring seek time using optical disk apparatus

A magneto-optical disk apparatus for measuring seek time comprising:

• a semi-conductor laser for emitting a light beam;
• a parallel circular collimator lens for collimating the light beam from said semi-conductor laser into a parallel circular light beam;
• a first beam splitter for transmitting the parallel circular light beam collimated by said parallel circular collimator lens and reflecting a light beam from a magneto-optical disk;
• a reflection mirror for reflecting the light beam transmitted by said first beam splitter to change a path thereof;
• an objective lens for forming a fine focus of the light beam reflected by said reflection mirror on the optical disk;
• a magnetic coil for generating a magnetic field based on a current flow therethrough to perform recording/erasing of information on the optical disk;
• a focusing lens adjusting a focusing distance of the light beam reflected by said first beam splitter;
• a second beam splitter for transmitting and reflecting the resultant light beam from said focusing lens;
• first beam detection means for detecting the light beam reflected by said second beam splitter and converting the detected light beam into a first current signal;
• second beam detection means for detecting the light beam transmitted by said second beam splitter and converting the detected light beam into a second current signal;
• current/voltage conversion means for converting the first and second current signals from said first and second beam detection means into voltage signals;
• low pass filtering means for filtering the voltage signals from said current/voltage conversion means to remove high frequency components therefrom;
• data signal separation means for separating a feedback signal and data signals from the resultant voltage signals obtained from said low pass filtering means;
• optical head control means for controlling an optical head driver in response to the feedback signal from said data signal separation means, said optical head driver driving an optical head under the control of said optical head control means;
• signal processing means for processing the data signals from said data signal separation means;
• and
• interface means for transferring the processed signals from said signal processing means to a host system and said optical head control means and transferring instructions and control signals from said host system to said signal processing means,
• wherein said signal processing means includes:
• a pit separation switch for separating header information pits and data information pits from the data signals obtained from said data signal separation means and outputting the resultant analog header information signal or data information signal;
• a pulse detector for converting the analog header information signal or data information signal from said pit separation switch into a digital signal;
• a sector mark detector for detecting a sector mark from the digital header information signal from said pulse detector to output a sector mark detect signal;
• a phase compensator for compensating for a phase of the digital data information signal from said pulse detector for synchronization with the digital header information signal outputted from said sector mark detector;
• and
• a microcontroller for decoding the digital header information signal from said sector mark detector and the digital data information signal from said phase compensator and controlling said pit separation switch in response to the sector mark detect signal from said sector mark detector.