APPARATUS FOR RECORDING AND/OR REPRODUCING DATA ONTO AND/OR FROM AN OPTICAL DISK AND METHOD THEREOF
First Claim
1. An optical disk apparatus for recording and/or reproducing user data onto and/or from an optical disk, said apparatus having an optical head having a lens with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 (μ
- m) or less for irradiating a laser beam having a wavelength of approximately 680 (nm) or less to said optical disk.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical disk apparatus for recording and/or reproducing user data onto and/or from an optical disk. The apparatus includes an optical head for irradiating a laser beam having a wavelength of approximately 680 (nm) or less to the optical disk and having a lens with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 (μm) or less. By utilizing such apparatus, a relatively large amount of data may be recorded onto the optical disk.
18 Citations
31 Claims
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1. An optical disk apparatus for recording and/or reproducing user data onto and/or from an optical disk, said apparatus having an optical head having a lens with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 (μ
- m) or less for irradiating a laser beam having a wavelength of approximately 680 (nm) or less to said optical disk.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 27, 29)
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16. An optical disk apparatus for recording and/or reproducing data, said apparatus comprising an optical pickup device having a numerical aperture of 0.70 or more and a working distance of 560 (μ
- m) or less for irradiating a laser beam onto an optical disk so as to record desired user data onto the optical disk with a shortest pit or mark length of 0.3 (μ
m) or less, said optical disk having a diameter of approximately 120 (mm), an information recording portion, and a light transmitting layer through which the laser beam is transmitted to said information recording face and having a thickness value within a range of 10 through 177 (μ
m), wherein the user data includes video signal data and audio signal data.
- m) or less for irradiating a laser beam onto an optical disk so as to record desired user data onto the optical disk with a shortest pit or mark length of 0.3 (μ
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25. An optical disk apparatus for recording and/or reproducing data, said apparatus comprising:
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an optical pickup device for irradiating a laser beam onto an optical disk having a diameter of approximately 120 (mm), an information recording portion, and a light transmitting layer through which the laser beam is transmitted to said information recording face and having a thickness value within a range of 10 through 177 (μ
m); and
means for rotating the optical disk such that a rotational speed thereof is varied successively in steps in accordance with a position of the laser beam;
wherein the information recording face of the optical disk is divided into a plurality of regions in shapes of concentric circles and desired data is recorded such that record densities at the respective regions are substantially equalized; and
wherein when data recorded on the optical disk is reproduced by switching the regions of the desired data to the regions of a predetermined recording object, the data recorded on the optical disk is reproduced while maintaining the rotational speed of the optical disk in correspondence with the regions of the predetermined recording object.
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26. A method of recording and/or reproducing data to and/or from an optical disk, said method comprising the steps of:
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varying successively a rotational speed of the optical disk in steps in accordance with a position of a laser beam;
dividing an information recording face of the optical disk into a plurality of regions having shapes of concentric circles; and
recording data to the optical disk such that recording densities at respective regions are substantially equal and reproducing recorded data from the optical disk;
wherein when data recorded on the optical disk is reproduced by switching the regions of the desired data to the regions of a predetermined recording object, the data recorded on the optical disk is reproduced while maintaining the rotational speed of the optical disk in correspondence with the regions of the predetermined recording object.
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28. An optical disk apparatus for recording and/or reproducing data to and/or from an optical disk, said apparatus comprising:
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means for varying successively a rotational speed of the optical disk in steps in accordance with a position of a laser beam;
means for dividing an information recording face of the optical disk into a plurality of regions having shapes of concentric circles; and
means for recording data to the optical disk such that recording densities at respective regions are(s substantially equal and for reproducing recorded data from the optical disk;
wherein when data recorded on the optical disk is reproduced by switching the regions of the desired data to the regions of a predetermined recording object, the data recorded on the optical disk is reproduced while maintaining the rotational speed of the optical disk in correspondence with the regions of the predetermined recording object.
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30. A disk cartridge for accommodating and retaining an optical disk having data recorded thereon by use of an optical head wherein said optical disk can be rotated in said disk cartridge but cannot be easily removed therefrom, said disk cartridge comprising:
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an opening extending in a radial direction of said optical disk; and
a shutter for closing and exposing said opening when the shutter is respectively moved between first and second positions;
wherein said optical head has a lens with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 (μ
m) or less and irradiates a laser beam having a wavelength of approximately 680 (nm) or less to said optical disk. - View Dependent Claims (31)
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Specification