Optical recording/reproducing apparatus

An optical recording/reproducing apparatus, comprising:

• (a) a laser source for generating a light beam for recording/reproducing operation;
• (b) an optical pickup including:
• (1) information reproducing photodetector means for receiving a light returned from a recording medium for optically recording/reproducing information to reproduce data recorded in the recording medium;
• (2) control photodetector means for receiving the light returned from the recording medium to effect position control of the light beam;
• (3) pickup position detecting means for detecting a position of said optical pickup;
• and
• (4) an optical system for guiding the light beam from said laser source to the recording medium, said information reproducing photodetector means, and said control photodetector means;
• said optical system
• including half mirror means for dividing the light beam from said laser source to a transmitted beam directed to the recording medium and a reflected beam directed to said pickup position detecting means, and for reflecting light returned from said recording medium to said control photodetector means;
• and
• (c) pickup moving means for moving at least a part of said optical pickup in a track traverse direction;
• whereby said pickup position detecting means will detect the position of said optical pickup in response to said reflected beam and said control photodetector means will control the position of the transmitted beam on the recording medium in response to said light returned from the recording medium.