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US 2003/0142605 A1Published application
Optical head device and optical disk device
AssigneeKabushiki Kaisha Toshiba
InventorSou Ishika
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AssigneeKabushiki Kaisha Toshiba
InventorSou Ishika
Estimating the term…
An optical head device includes a light source for emitting a light beam and a focusing device for focusing the light beam onto a recording medium. An optical path directs the light beam from the light source toward the recording medium. The optical path directs a first portion of the light beam to fall upon the focusing device. A second portion of the light beam does not fall upon the focusing device. A light detector is positioned such that a light receiving face of the light detector is approximately perpendicular to an advancing direction of the second portion of the light beam and detects an amount of light in the second portion of the light beam for control of the power of the light beam emitted from the light source. Thus, APC processing is performed without reducing utilization efficiency of the laser beam of a trunk system.
An optical head device having a light source for emitting a light beam and a focusing device for focusing the light beam onto a recording medium, comprising:
An optical disk device having a light source for emitting a light beam and a focusing device for directing said light beam onto a recording medium via an optical path having a first region corresponding to a first portion of said light beam falling upon said focusing device, and a second region corresponding to a second portion of said light beam not falling upon said focusing device, said optical disk device comprising:
In an optical head device having a light source for emitting a light beam and a focusing device for focusing the light beam onto a recording medium, a method of controlling power from said light source, the method comprising:
Dependencies are inferred from the claim text.