Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
1998-12-15
2001-07-10
Edun, Muhammad (Department: 2651)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S047100, C369S116000
Reexamination Certificate
active
06259666
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical information recording apparatus, an optical information recording method and an optical information recording medium which may be applied to recording apparatus of a compact disc (CD) and a digital video disk (DVD), a recording method of CD and DVD and disks for such CD and DVD, for example. The recording apparatus and the recording method of the present invention may record information such as music information, a video signal or the like on an optical disk by turning on and off a recording laser in accordance with a method standardized in the CD and DVD standardization. At the same time, by gently changing the output of the recording laser, it becomes possible to record on the same disk second information which is not standardized in the CD and DVD standardization.
Also, in the optical information recording medium according to the present invention, there may be recorded new information that may be recognized by visually confirming the disk surface, in addition to the music information and video signal standardized in the CD and DVD standardization, for example.
2. Description of the Related Art
According to the patent application (Japanese patent application No. 8-205292) filed on Jul. 16, 1996 by the same assignee, displacement amounts are obtained from the ideal edge position of the reproduced signal in response to all recorded signal patterns, and the table is formed based on such displacement amounts. By using this table and recording the recording signal while changing the edge position of the recording signal in response to the pattern of the recording signal, it is possible to eliminate the jitter. Thus, it becomes possible to record the second information such as character information, graphic information and so on, which are not contained in the CD standardization, on the signal recording portion of the compact disc (CD) in an superimposing fashion. Further, according to the patent application (Japanese patent application No. 9-67843) filed on Mar. 5, 1997 by the same assignee, an ID (identification) pattern such as a bar code or the like formed by a watermark is recorded on the lead-in or the signal recording portion of the optical disk and such recorded pattern is detected electrically, whereby a disk ID or cipher is read out to thereby prevent the illegal copy or piracy. Furthermore, according to the patent application (Japanese patent application No. 9-298328) filed on Oct. 3, 1997 by the same assignee, there is provided a circuit for transforming polar coordinates of a radius (track number) and a rotation speed (number of FG pulses) indicative of the position in the cutting process into orthogonal coordinates in real time, thereby making it possible to execute the cutting process by using data expressed by the orthogonal coordinates system as they are. Of course, these optical disk apparatus are able to record an EFM (Eight-to-Fourteen Modulation) modulated signal standardized in the compact disc standard in addition to information such as character information and graphic information. Accordingly, the disk thus recorded by the above optical disk apparatus may be reproduced by a conventional player, and also it becomes possible to manufacture a disk in which character and graphic information are recorded on the disk signal portion thereof and in which the value added is improved.
However, according to the above-mentioned conventional method, the second information such as character information, graphic information and so on is recorded as the change of the laser output. As a result, there is then the possibility that signal characteristics will be fluctuated at the boundary portion in which the laser output is changed. Therefore, the laser output could not be changed largely. As a result, there is then the problem that second information such as recorded character information, graphic information and so on is not made clear sufficiently.
SUMMARY OF THE INVENTION
In view of the aforesaid aspect, it is an object of the present invention to provide an optical information recording apparatus and an optical information recording method in which second information such as character information, graphic information or the like recorded on a disk may be recorded as a large laser output difference, thereby making it possible to record clear second information.
It is an object of the present invention to provide an optical information recording medium in which a pit width is changed largely by the second information so that the second information may be visually confirmed more clearly.
According to a first aspect of the present invention, there is provided an optical disk recording apparatus which is comprised of a modulation signal generating device for generating a modulation signal which changes in response to first information, a time change signal generating device for generating a time change signal which changes in accordance with second information in time, a light amount changing device for changing a light amount of the laser beams in accordance with the time change signal, and an optical modulating device for turning on and off the laser beams obtained from the light amount changing device in accordance with the modulation signal. Thus, the laser light amount is changed gently by the second information.
The optical information recording apparatus according to the present invention acts as follows.
The modulation signal generating device generates the modulation signal which changes in response to the first information. The time change signal generating device generates the time change signal which changes in time in accordance with the second information. The light amount change device changes the light amount of the laser in accordance with the time change signal. The optical modulating device turns on and off the laser light or beam obtained from the light amount change device in accordance with the modulation signal. Thus, the laser light amount is changed gently by the second information.
According to a second aspect of the present invention, in the optical information recording apparatus, the modulation signal generating device comprises a first modulation signal generating device for generating a first modulation signal by switching a signal level with a period of an integer multiple of a predetermined fundamental period in response to the first information, a change pattern detecting device for detecting a change pattern of the first modulation signal and a timing correcting device for generating a second modulation signal by correcting a change timing of the first modulation signal in accordance with both of the time change signal and the change pattern mentioned above. The change timing of the recording signal is corrected in response to both of the change of the laser light amount and the change pattern of the recording signal.
According to a third aspect of the present invention, there is provided an optical information recording method in which first information is recorded by mainly turning on and off the laser beam, second information is recorded by mainly changing the light intensity of the laser beam, and the light intensity of the laser beam is changed gently from a time standpoint.
According to the optical information recording method of the present invention, the first information is recorded by mainly turning on and off the laser beam. Also, the second information is recorded by mainly changing the light intensity of the laser beam. Thus, the light intensity of the laser beam is changed gently from a time standpoint.
Further, the timing at which the laser beam is turned on and off is adjusted in accordance with both of the first information and the light intensity of the laser beam.
Also, in the optical information recording medium according to the present invention, the first information is recorded by mainly changing the pit length and the pit position, and the second information is recorded by mainly changing the pit width.
Also, the optic
Kobayashi Seiji
Koehle Roderick
Edun Muhammad
Frommer William S.
Frommer & Lawrence & Haug LLP
Kessler Gordon
Sony Corporation
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