| 摘要 |
The invention relates to an optical unit for inscribing and/or scanning an information track in a rotating optical disc by means of a radiation beam. The optical unit comprises a frame (1), a subframe (3), an objective holder (5) having an objective (7) for concentrating the radiation beam so as to form a radiation spot, first connecting means (11) for movably connecting the objective holder to the subframe, which first connecting means allow focussing movements of the objective and counteract other movements, second connecting means (9) for movably connecting the subframe to the frame, which second connecting means allow radial tracking movements of the objective and counteract other movements, electrically controllable first focussing means (19), connected to the frame and electrically controllable second focussing means (21) connected to the objective holder, which first and second focussing means cooperate with each other to produce the focussing movements, electrically controllable first tracking means (19) connected to the frame and electrically second tracking means (25) connected to the objective holder, which first and second tracking means cooperate with each other to produce the tracking movements, and a reflecting surface (13) provided on the subframe to direct the radiation beam towards the objective.
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