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7372794 |
Compatible optical pickup applying tilt to objective lens in proportion to radial movement of objective lens
A compatible optical pickup compatibly using a high density recording medium and at least one low density recording medium, includes an objective lens to form a light spot suitable for use on a...
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7333416 |
Optical pickup apparatus for recording or reproducing information for an optical information recording medium and objective lens for optical pickup apparatus
An objective lens of an optical pickup apparatus converges a divergent light flux onto an information recording surface. The following conditional formula is satisfied:
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6735157 |
Optical-pickup device and tilt-detecting method thereof
An optical-pickup device includes a plurality of light sources, an objective lens for converging light from the plurality of light sources on an optical disc, and at least one light-receiving...
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6707615 |
Optical pickup apparatus restricting aberration and optical disc apparatus using the same
An optical recording/reproducing apparatus has a light source that radiates a laser beam, an optical detector that detects reflected light from the optical disc, a collimator lens that converts the...
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6590851 |
Optical pickup for recording/reproducing optical discs of multiple thicknesses
An optical pickup including: first and second light sources for generating first and second laser beams having different wavelengths corresponding to first and second media having different...
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6487161 |
Objective lens and optical head for optical disc drive
An optical head for an optical disc drive is provided with a first laser diode that emits a shorter wavelength laser beam, a second laser diode that emits a longer wavelength laser beam, and an...
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6477129 |
Optical disc drive
An optical disc drive using either one of a first disc (e.g., DVD) and a second disc (e.g., CD), is provided with a first laser diode that emits a shorter wavelength beam, a second laser diode that...
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