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US07613092B2 Reproduction apparatus and focus jump method 失效
繁殖装置和重点跳跃法

Reproduction apparatus and focus jump method
摘要:
The invention provides a reproduction apparatus that reproduces information recorded in a recording medium having plural recording layers, including: an optical head that irradiates laser beams on the respective recording layers and detects reflected light information to read out information recorded in the respective recording layers; a shaft sliding type focus actuator that holds the object lens; a focus servo section that generates a focus servo drive signal and drives the focus actuator such that a focus state of the laser beams is kept in a state of focus on a recording layer on which the reproduction is performed; and a focus jump control section that generates a kick signal for starting focus jump movement by the focus actuator and a brake signal for ending the focus jump movement.
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