Disc device that controls the incident angle of a light beam striking a disc
First Claim
Patent Images
1. An optical disc driving device comprising:
- disc rotating driving means having selectively loaded thereon a first optical disc with a data recording density being a first recording density or a second optical disc with a data recording density being a second recording density higher than that of said first optical disc;
an optical pickup having an objective lens for converging a light beam radiated from a light source for radiating the converged light beam on said first optical disc or said second optical disc;
means for determining whether the first optical disc or the second optical disc is loaded on the disc rotating driving means; and
skew control means for performing radial skew control when the second optical disc is loaded on the disc rotating driving means by adjusting a tilt between the objective lens and the second optical disc, and for inhibiting radial skew control when the first optical disc is loaded on the disc rotating driving means.
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Abstract
An optical disc driving device employing an optical disc as a recording medium. The device includes a skew control mechanism for controlling relative tilt between an optical disc and an objective lens for selectively recording and/or reproducing data on or from a first optical disc having a standard recoding density and a second optical disc having a high recording density. The relative tilt between the second optical disc and the objective lens is controlled by the skew control mechanism only when the second optical disc is loaded and data is recorded and/or reproduced on or from the second optical disc.
49 Citations
19 Claims
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1. An optical disc driving device comprising:
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disc rotating driving means having selectively loaded thereon a first optical disc with a data recording density being a first recording density or a second optical disc with a data recording density being a second recording density higher than that of said first optical disc; an optical pickup having an objective lens for converging a light beam radiated from a light source for radiating the converged light beam on said first optical disc or said second optical disc; means for determining whether the first optical disc or the second optical disc is loaded on the disc rotating driving means; and skew control means for performing radial skew control when the second optical disc is loaded on the disc rotating driving means by adjusting a tilt between the objective lens and the second optical disc, and for inhibiting radial skew control when the first optical disc is loaded on the disc rotating driving means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical disc driving device comprising:
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disc rotating driving means having selectively loaded thereon a first optical disc with a data recording density being a first recording density or a second optical disc with a data recording density being a second recording density higher than that of said first optical disc; an optical pickup having an objective lens for converging a light beam radiated from a light source for radiating the converged light beam on said first optical disc or said second optical disc; means for discriminating a sort of the optical disc loaded on said disc rotating driving means, said disc sort discriminating means discriminating the sort of the optical disc loaded on a disc table using return light information from the optical disc obtained under a condition in which the light beam outputted from the optical pickup on the optical disc loaded on said disc rotating driving means is focused on the surface of the optical disc and the return light information from the optical disc obtained under a condition in which said light beam is focused on a signal recording surface of said optical disc; skew control means for controlling the tilt between said objective lens and said optical disc loaded on said disc rotating driving means; and skew control stop means for stopping skew control by said skew control means when said discrimination means detects said first optical disc. - View Dependent Claims (8, 9)
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10. An optical pickup device comprising:
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disc transfer means for holding a first optical disc with a data recording density being a first recording density or a second optical disc with a data recording density being a second recording density higher than that of said first optical disc, horizontally moving said first optical disc and said second optical disc across the inside and the outside of a main body portion of the device for transferring said first optical disc or said second optical disc; disc rotating and driving means on which is loaded the first optical disc or the second optical disc transferred by said disc transfer means; first supporting means for rotatably supporting said disc rotating driving means in a direction towards and away from said disc transfer means; rotating driving means for rotationally driving said first supporting means; an optical pickup having an objective lens for converging a light beam radiated from the light source for radiating the converged light beam on said first optical disc or said second optical disc; second supporting means supporting said optical pickup and supported by said first supporting means for rotation in the direction of the optical axis of said objective lens; means for discriminating the sort of the optical disc loaded on said disc rotating driving means; skew control means adapted for rotating said second supporting means for controlling a relative tilt between said objective lens and the first optical disc or said second optical disc loaded on said disc rotating driving means; and skew control stop means for stopping skew control by said skew control means when said discrimination means detects said first optical disc. - View Dependent Claims (11, 12, 13, 14)
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15. A disc driving device comprising:
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a disc table that supports a disc; a spindle motor connected to the disc table that rotationally drives the disc table; an optical pickup that focuses a light beam on a disc supported on the disc table; a discriminator circuit that detects a disc type from a plurality of disc types when a disc is supported on the disc table, the plurality of disc types including a first disc type and a second disc type; and a skew control circuit that detects a radial skew between an axis of the light beam and a disc supported on the disc table, the skew control circuit correcting for the radial skew when the second disc type is detected by adjusting a tilt between the disc and the axis of the light beam, and not correcting for the radial skew when the first disc type is detected. - View Dependent Claims (16, 17, 18, 19)
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Specification