Optical Pickup Device
AssigneesSanyo Electric Co., Ltd., Sanyo Optec Design Co., Ltd.
InventorsRyoichi Kawasaki, Satoshi Sekiguchi
Life of this patent
Estimating the term…
Abstract
An optical pickup device for reading a signal recorded in an optical disc including a first signal recording layer and a second signal recording layer, comprising: a laser diode configured to emit laser light; and a diffraction grating configured to be applied with laser light emitted from the laser diode, and to generate a main beam including zero order light, and a sub beam including plus first order light and minus first order light, such that a ratio of light amount of the sub beam to that of the main beam is substantially 1:7.
Claims5
An optical pickup device for reading a signal recorded in an optical disc including a first signal recording layer and a second signal recording layer, comprising:
- a laser diode configured to emit laser light;
- and
- a diffraction grating configured
- to be applied with laser light emitted from the laser diode, and
- to generate a main beam including zero order light, and a sub beam including plus first order light and minus first order light, such that a ratio of light amount of the sub beam to that of the main beam is substantially 1:7.
Dependencies are inferred from the claim text.