Focus control device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTooru Iwatani, Yoshihiro Kozawa
Life of this patent
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Abstract
A focus control device includes a moving member integral with an object lens, a focus actuator for moving the object lens toward or away from a recording surface of an optical disc in a direction of focusing, a tracking actuator for moving the object lens in a direction of tracking, and a control unit for biasing the moving member in the direction of tracking so that the moving member is pressed against a fixed member by using the tracking actuator, and for enabling the moving member to carry out a focusing operation while the moving member is pressed against the fixed member by using the focus actuator. Thus the focus control device can surely carry out a focusing operation without being under the influence of turbulence vibrations or the like that may be generated.
Claims5
A focus control device comprising:
- a moving member integral with an object lens, for holding the object lens that is opposite to a recording surface of an optical disc;
- a focus actuator for moving the object lens toward or away from the recording surface of the optical disc in a direction of focusing;
- a tracking actuator for moving the object lens in a direction of tracking;
- and
- a control unit for biasing said moving member in the direction of tracking so that said moving member is pressed against a fixed member by using said tracking actuator, and for enabling said moving member to carry out a focusing operation while said moving member is pressed against said fixed member by using said focus actuator.
Dependencies are inferred from the claim text.