Method for manufacturing optical recording medium base disk and manufacturing device
A technology of optical recording medium and manufacturing method, applied in the fields of optical recording carrier manufacture, optical recording carrier, recording/reproducing by optical method, etc.
Inactive Publication Date: 2006-09-06
PANASONIC CORP
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[0004] Moreover, the switching of the groove pitch must be completed within the setting range between each area, and it must be synchronized with the signal used to form the grooves of each area.
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[0016] The mastering method of the optical recording medium of the present invention is a method of forming a predetermined signal area by irradiating recording light such as laser light on a rotating disc substrate for mastering and performing exposure processing. The recording light is modulated or deflected to form a predetermined signal area, and is irradiated while moving in the radial direction of the disk substrate. During irradiation of the recording light, the rotational speed of the disk substrate and the moving speed of the recording light are controlled according to the track pitch in each signal area.
[0017] The present invention is particularly applicable to the case where a plurality of signal areas having different track pitches are formed on a disc substrate. The present invention is characterized in that grooves with different pitches are continuously formed at the boundary portion between different signal regions. As a result, signals corresponding to a p...
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Abstract
A modulated or deflected recording light for forming a signal area on a disk substrate for creating a master is generated, and the rotating disk substrate coated with a photosensitive material is irradiated with the recording light for exposure while the recording light is being moved in a radial direction of the disk substrate. During the irradiation of the recording light, the rotational speed of the disk substrate and the movement speed of the recording light are controlled in such a manner that they have a predetermined relationship in accordance with the pitch of tracks in the signal area. The recording light is modulated or deflected continuously in accordance with the signals for irradiation on the disk substrate, using signals corresponding to a plurality of signal areas with different track pitches. When switching the signal area, the track pitch is changed by changing the relationship between the rotational speed of the disk substrate and the movement speed of the recording light, based on the track pitch in the next signal area.
Description
technical field [0001] The present invention relates to a method for manufacturing a master disk for optical recording media such as optical discs, in particular, a method for manufacturing a master disk for an optical recording medium suitable for a plurality of signal areas with different track pitches, and its manufacturing device. Background technique [0002] In an optical disc, information is recorded in an area where a spiral groove is formed, or the recorded information is reproduced by an optical head. In a recording area where one track is continuous on a conventional optical disc, the pitch of the formed tracks (track pitch) is fixed. For example, on a DVD-RAM disc, the track pitches of the playback-only area where control data is recorded and the playback information area are different, but the tracks in these two areas are discontinuous. Therefore, when each area is formed on an optical disc master for manufacturing an optical disc, it is only necessary to reco...
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IPC IPC(8): G11B7/26G11B7/007
CPCG11B7/261G11B7/24079G11B7/26
Inventor 阿部伸也佐藤秀二
Owner PANASONIC CORP