Apparatus for recording and/or reproducing data onto and/or from optical disk and method thereof

Abstract

An apparatus for recording user data to and / or reproducing user data from an optical disc, the apparatus comprising an optical head for directing a laser beam having a wavelength of about 680 nm or less to the optical disc, the optical head having about Objectives with numerical apertures of 0.7 or greater and working distances of 560 μm or less. By utilizing such devices, a relatively large amount of data can be recorded onto an optical disc.

Description

technical field [0001] The present invention relates to optical disc devices, and more particularly to an apparatus for recording data (such as video signal data and audio signal data) to and / or reproducing data from an optical disc using a laser beam having a wavelength of 680 nm or less and a lens system having a numerical aperture (NA) of 0.7 or more and arranged with a working distance of 560 μm or less, so as to enable a large amount of data to be recorded on an optical disc. Background technique [0002] Video and / or audio data can be recorded to and / or played back from many different types of storage media, such as cassette tapes and so-called digital versatile discs (DVDs). data. However, as described below, cassette tapes and DVDs have disadvantages associated with this. [0003] The videocassette for consumer use has about 2 hours of data recorded on it. While this recording time is acceptable for consumer use, the quality of playback cannot always be acceptable...

AI Technical Summary

Problems solved by technology

However, in order to ensure a recording / playback time of 2 hours from one side of a DVD (to provide the same recording / playback time as a videocassette) and to enable the above-mentioned functions (editing, easy access, etc.), about 8GB is required data, however, as previously stated, a single-sided DVD only records 2.6GB of data

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