Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
2000-10-31
2004-06-22
Huber, Paul W. (Department: 2653)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S047510
Reexamination Certificate
active
06754158
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an optical information recording apparatus and method, and an optical information recording medium. For example, the present invention is applicable to a recording apparatus for a compact disk (CD) and a digital video disk (DVD), and to its recording method. According to the present invention, a positional information of laser beam irradiation position on a polar coordinate is converted into a positional information on a rectangular coordinate so as to access the corresponding image data, and then, in accordance with the image data, a laser beam power is controlled. Whereby it is possible to readily and visibly record characters and images in an information recording surface of a CD or the like.
Moreover, according to the method determined based on the CD and DVD standards, a recording laser is turned on and off, and thereby, information such as music and a video signal is recorded on an optical disk. Simultaneously, the recording laser output (power) is gently varied, and thereby, it is possible to record a second information which is not determined in the CD and DVD standards, in the identical optical disk.
In the present invention, according to the method determined based on the CD and DVD standards, a recording laser is turned on and off, and thereby, information such as music and a video signal is recorded on an optical disk. Simultaneously, a luminous pulse of the recording laser is divided into two parts, or is made so as to have a depressed portion, and thereby, it is possible to record a second information which is not determined in the CD and DVD standards, in the identical optical disk.
Further, the optical information recording medium of the present invention can record a new information such as a watermark capable of being visibly confirmed by seeing a disk, a visible image or the like, in addition to the above information such as music and a video signal determined based on the CD and DVD standards.
BACKGROUND ART
Conventionally, in this type of optical information recording medium, for example, a compact disk, a data used for recording is subjected to data processing, and thereafter, is modulated according to an EFM (Eight to Fourteen Modulation)(hereinafter, referred simply to as “EFM-modulated”). In this manner, a pit line is formed in the compact disk, and has a period 3T to 11T with respect to a predetermined basic period T, and thereby, an audio data or the like is recorded.
On the contrary, in a compact disk player, a laser beam is irradiated to a compact disk, and then, a return light is received, and thereby, it is possible to obtain a regenerative signal of the return light, which has a signal level which varies in accordance with a light quantity. Then, the regenerative signal is binarized according to a predetermined slice level so that a binary signal is generated. Further, according to the binary signal, a PLL circuit is driven so as to generate a reproducing clock, and the binary signal is successively latched by the reproducing clock, and thereby, it is possible to generate a reproductive data having a period 3T to 11T corresponding to a pit line formed in the compact disk.
The compact disk player decodes the reproductive data thus generated according to the data processing corresponding to data processing in recording, and then, a pit line is formed on a compact disk substrate. Further, a reflection film is formed on the disk substrate, and thus, an information recording surface is formed thereon. Moreover, characters such as a title, a name of music and a maker name, and images are visibly printed on the information recording surface according to screen process printing.
DISCLOSURE OF THE INVENTION
For example, according to Japanese Patent Application No. 8-205292 as filed on Jul. 16, 1996 by the applicant, the following optical disk apparatus has been disclosed therein. More specifically, in accordance with all signal pattern to be recorded, a displacement shifted from an ideal edge position of the regenerative signal is determined, and then, a table is prepared. Further, with the use of the table, an edge position of a recording signal is varied and recorded in accordance with a recording signal pattern, and thereby, a jitter can be removed. Thus, it is possible to overlap and record characters and figures, that is, a second information which is not included in the CD standards, in a signal recording area of the compact disk (CD). Further, according to Japanese Patent Application No. 9-67843 as filed on Mar. 5, 1997 by the applicant, the an following optical disk apparatus has been disclosed therein. More specifically, an ID pattern such as a bar code by a watermark is recorded in a read-in or signal recording area of an optical disk, and then, the pattern is electrically detected. By doing so, a disk ID or cipher is read out so as to prevent a copy or pirated edition of the optical disk from appearing on the market. Further, according to Japanese Patent Application No. 9-298328 as filed on Oct. 30, 1997 by the applicant, the following optical disk apparatus has been disclosed therein. More specifically, in order to show a cutting position, the optical disk apparatus includes a circuit which converts a polar coordinate of a radius (track number) and a rotational speed (number of FG pulse) into a rectangular coordinate at a real time, and thereby, a data expressed by the rectangular coordinate system is used as it is, and then, it is possible to carry out cutting. Of course, these optical disk apparatuses record an EFM-modulated signal which is determined in the compact disk standards, in addition to information such as characters, figures or the like. Therefore, it is possible to reproduce an optical compact disk by the conventional player, and in addition, characters and figures are recorded in the signal area of the disk, so that a disk having a high value added can be manufactured.
Moreover, Japanese Patent application No. 9-347532 filed by the present applicant have disclosed an optical information recording apparatus, an optical information recording method and an optical information recording medium, which can record second information such as characters and figures recorded on a disk as a difference of laser output power, and as a result, can record a clear second information. In addition, Japanese Patent application No. 9-173811 filed by the present applicant have disclosed an optical disk recording apparatus, an optical disk and an optical disk reproducing apparatus (player), which divides a pit having a period 9T or more into 4T+1T+4T so that a space is recorded as the center 1T in place of a pit, and thereby, can record a new information depending upon the pit whether or not it is divided into two.
According to the invention disclosed in the aforesaid Patent Applications, there is the possibility that a signal characteristic is variable in boundary portion where a laser output varies; for this reason, a change of the laser output is not too widely taken. As a result, there is a problem that the recorded second information such as characters and figures are not clear. Moreover, in production and sale of the optical disk such as CD and DVD, a illegal copy and an expansive sale of disk are an important matter. One method for preventing the illegal copy is to record a watermark (pattern) on the disk similarly to that carried out in bills (paper money). The recorded watermark is a visible or dim image, or an invisible signature which is visibly stood out on an information layer of the disk detected by a special hardware. The disk having the watermark is not transferred even in the case of being copied by a conventional technique; therefore, it is possible to simply confirm a truth of the disk.
Unexamined Patent Publication (Kokai) No. 10-31825 has disclosed a method of recording a watermark (pattern) on an optical disk by varying a size of an information pit. In two areas on the disk having an information pit of different size, a contrast of reflection light is visible to a user
Ishimoto Tsutomu
Kobayashi Seiji
Koehle Roderick
Yamatsu Hisayuki
Huber Paul W.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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