Optical disk and optical information processor
AssigneeHitachi, Ltd.
InventorsTakeshi Maeda, Kazuo Shigematsu, Seiji Yonezawa
Life of this patent
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Abstract
An optical disk for accumulating information in the form in which an information signal can be optically read, wherein to the end of additionally recording information, a line of pits are arrayed at periodical intervals on an information recording carrier and are recorded in a manner to minutely wobble in the rotating direction of the disk at a fixed period.
Claims6
In an optical disk having a recording medium which is capable of recording an information signal in a form permitting the information signal to be optically reproduced;
- a plurality of guide pits recorded in said recording medium at periodic intervals in a line which minutely wobbles in a rotating direction of said disk at a predetermined frequency, said line of guide pits forming a guide groove to be used for tracking control, and further including information pits designating predetermined information additionally recorded in said recording medium in the intervals between guide pits of said line of guide pits forming said guide groove.
In an optical information processor for use with an optical disk having a recording medium which is capable of recording an information signal in a form permitting the information signal to be optically reproduced, and in which a plurality of guide pits are recorded in said recording medium at periodic intervals in a line which minutely wobbles in a rotating direction of said disk at a predetermined frequency so as to form a guide groove to be used for tracking control, said optical information processor comprising
- means for reading out the guide groove of said disk by detecting said guide pits and producing a detection signal therefrom;
- means responsive to said detection signal for generating clock pulses having a period corresponding to that of said line of guide pits forming said guide groove;
- means for generating a modulating signal in response to an applied data signal to be recorded and said clock pulses;
- means including a light source for recording an information signal on the recording medium of said disk;
- and
- means responsive to said modulator signal for controlling said recording means for recording information pits in said recording medium in the intervals between guide pits of said line of guide pits forming said guide groove.
Dependencies are inferred from the claim text.