| 摘要 |
When an image is formed on an optical disc, a pickup is moved by a pitch S in the radial direction of the optical disc together with a slider supporting the pickup. An objective lens within the pickup is shifted by a predetermined shift amount L by an actuator to emit a laser beam. The temperature in the vicinity of the pickup is detected by a temperature sensor. If the detected temperature has increased as much as, or more than, a threshold DeltaTth relative to the temperature prior to the beginning of the formation of an image, a movement setting unit sets the slider movement pitch S and the objective lens shift amount L to small values so as to reduce the maximum drive current applied to the actuator.
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