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AssigneePioneer Corporation
InventorsHiroyuki Abe, Takeshi Sato, Kazushige Kawana, Hideaki Watarihana, Shinichi Naohara, Motoi Kimura, Yuichi Kimikawa, Masakazu Takahashi
Estimating the term…
A focus control apparatus for a multilayer optical recording medium which performs an appropriate focus jump on a multilayer optical recording medium. This focus control apparatus implements such focus jump control as to temporarily release a focus servo on one layer of a loaded multilayer optical recording medium, shift the focus position of read light on another target layer and then restart the focus servo on the another target layer, detects an ambient temperature, sets a drive signal condition according to the temperature detection output, and moves the focus position of the read light under the set drive signal condition. Specifically, this apparatus generates an acceleration signal to start moving the focus position of read light and a deceleration signal to decelerate movement of the focus position of the read light, as drive signals for a focus actuator in order to execute a focus jump operation, detects an ambient temperature of the focus actuator, and sets signal conditions for the acceleration signal and the deceleration signal according to the detected temperature.
A focus control apparatus for a multilayer optical recording medium for implementing such focus jump control as to temporarily release a focus servo on one layer of a loaded multilayer optical recording medium, shift a focus position of read light on another target layer and then restart said focus servo on said another target layer, said apparatus comprising:
A focus control apparatus for a multilayer optical recording medium for generating an acceleration signal to start moving a focus position of read light and a deceleration signal to decelerate movement of said focus position of said read light, as drive signals for a focus actuator in order to execute a focus jump operation to irradiate said read light onto a recording medium having information recording surfaces on at least two layers formed perpendicular to a surface of said recording medium and loaded in a reproduction apparatus for reproducing data from said recording medium, and to shift said focus position of said read light from said recording surface of one of said at least two layers to said recording surface of another layer based on a focus error signal to be generated on a basis of return light of said read light from said recording medium, said focus control apparatus comprising:
Dependencies are inferred from the claim text.