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1. 发明专利

JP2002133790A DIGITAL MODULATING DEVICE AND DIGITAL MODULATING METHOD 失效
公开(公告)号：JP2002133790A
公开(公告)日：2002-05-10
申请号：JP2000322850
申请日：2000-10-23
申请人： VICTOR COMPANY OF JAPAN
发明人： NAGANO HIROBUMI
IPC分类号： G11B20/14 , H03M7/14 , H04L27/04
摘要： PROBLEM TO BE SOLVED: To solve problems that fluctuations of the DC component of a regeneration signal abruptly occur in a simple DCC method, a servo mechanism becomes unstable, or automatic slicing is affected, and the power consumption of the whole device is increased for reinforcing the servo mechanism or the like to prevent them. SOLUTION: When the simple DCC method is selected by a DCC switching signal. the DSV integrated value retained on a DSV register 7 is reset to 0 by a timing control signal at a pause of a specific unit such as a sector or an ECC block. When a look-ahead method is selected by the DCC switching signal, the DCV register 7 retains the DSV value inputted from a DSV comparing circuit 9 as the DSV integrated value regardless of the pause of the specific unit such as the section or the ECC block. An external controller can select the simple DCC method according to a storage medium by controlling the DCC switching signal.

2. 发明专利

JPH08138267A OPTICAL RECORDING MEDIUM AND PRODUCTION OF OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH08138267A
公开(公告)日：1996-05-31
申请号：JP29783094
申请日：1994-11-07
申请人： VICTOR COMPANY OF JAPAN
发明人： NAGANO HIROBUMI , KURODA MIKIYA , KASAI TOSHIKI
IPC分类号： G11B7/24 , G11B7/26 , G11B19/04
摘要： PURPOSE: To make it possible to execute reproducing only when a reproducing machine to be exclusively used is used and to prevent execution of 1 to 1 copying on the optical recording medium of the same size by providing the optical recording medium with a mask layer of a material having desired optical characteristics on the side outer than a recording layer. CONSTITUTION: This optical recording layer is provided with the mask layer 3 on the other side of the recording layer by using the material having the optical characteristics to generate a reversible charge in the optical characteristics when the material is irradiated with a light beam of the intensity higher than the intensity of the light beam used at the time of reproducing information from general magnetic recording medium having no mask layers. The density of the information recorded on the recording layer 3 is set higher than the max. recording density which can be read out even if there is no mask layer 3. As a result, the irradiation of the recording layer with the light spot of a desired bore is prevented by the mask layer as the power of the light beam is low when the reproducing is executed with a general reproducing machine. In addition, the recording density is high when reproduction is attempted to be executed by using the light beam of a high power, therefor, the execution of 1 to 1 copying on the recording medium of the same size is not possible.

3. 发明专利

JPH0822620A OPTICAL RECORDING MEDIUM REPRODUCING METHOD AND ITS REPRODUCING DEVICE 失效
公开(公告)号：JPH0822620A
公开(公告)日：1996-01-23
申请号：JP17177594
申请日：1994-06-30
申请人： VICTOR COMPANY OF JAPAN
发明人： KASAI TOSHIKI , KURODA MIKIYA , NAGANO HIROBUMI , ITONAGA MAKOTO , EGUCHI HIDEJI , NAKAGAWA EIJI
IPC分类号： G11B7/00 , G11B7/005 , G11B7/135
摘要： PURPOSE:To provide a method of reproducing an optical recording medium capable of recording in high density on the optical recording medium reducing a laser beam effective spot size by a mask layer. CONSTITUTION:An optical disk having the mask layer reducing the irradiation laser beam effective spot size is reproduced by using a spot 16A of an ellipse shape provided with the major axis in the track direction and of which the width in the direction of the minor axis is double or below of a track pitch. Such a ellipse-shaped spot is obtained by using a main robe spot 16A of a super resolution spot obtained by reducing light intensity in the central part of the laser beam by a light shielding member. The cross talk and the interference between codes due to side robe spots 15A occurring on both sides of the main robe spot are removed by the mask layer.

4. 发明专利

JPH07272282A OPTICAL DISK, CHECKING DEVICE AND RECORDING DEVICE 失效
公开(公告)号：JPH07272282A
公开(公告)日：1995-10-20
申请号：JP25480494
申请日：1994-09-22
申请人： VICTOR COMPANY OF JAPAN
发明人： OZAKI KAZUHISA , NAGANO HIROBUMI , KAYANUMA KANJI
IPC分类号： G11B7/24 , G11B7/00 , G11B7/004 , G11B7/007 , G11B7/095 , G11B7/26 , G11B19/04 , G11B20/10
摘要： PURPOSE:To effectively prevent unauthorized copying of a disk. CONSTITUTION:The figure (A) shows the shape of the wobbling pit of a disk and the figure (B) shows a tracking error. In the normal arrangement of the pit on the left-hand side, the center line of the pit is coincident with the center line of a track. On the other hand, in the part of a singular pit train on the right hand side, both center lines are deviated and the center of the pit is wobbled. When the tracking error for these arrangement is obtained by means of a pickup having spots S1-S3, the reflected light quantities of the spots S1 and S3 are nearly equal on the left-hand part and a tracking error signal becomes '0'. However, on the right-hand part, the reflected light quantities of the spots S1 and S3 are unbalance and the tracking error signal is increased in proportion to the deviation from the virtual center line of track. Consequently, when the part in which the pit train is wobbled is reproduced, a tracking error signal superimposed with a wobble signal is obtained.

5. 发明专利

JPH10308034A OPTICAL DISK RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH10308034A
公开(公告)日：1998-11-17
申请号：JP12644597
申请日：1997-04-30
申请人： VICTOR COMPANY OF JAPAN
发明人： TAKEHARA HIDEAKI , OISHI KENJI , NAGANO HIROBUMI
IPC分类号： G11B7/135 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To omit an initializing step during a disk manufacturing process in a factory so as to reduce optical disk costs by providing a light emitting source for emitting a flash light in an optical disk recording/reproducing device so as to provide an initializing function. SOLUTION: A flash light from a light emitting source 7 provided along a radial direction is transmitted through an optical element 9 having a lens function, a fan-like light irradiating surface having an opening angle θ is formed and the full surface of an optical disk D for rotating the light irradiating surface is irradiated and then initialization is performed. At this time, the cycles of the rotation of the disk and the flickering of the light emitting source 7 are slightly shifted from each other by a controller 8, a flash light is provided for irradiation while the disk is rotated, and initialization, conversion into amorphous, initialization, and crystallization are repeated. The fan-like opening angle θ is decided based on the easy forming of a fan-like light irradiating surface for making the strength of the full surface of the disk D as uniform as possible, but it is better to set its size as small as possible.

6. 发明专利

JPH08147767A OPTICAL DISK, CHECKING DEVICE, RECORDER 失效
公开(公告)号：JPH08147767A
公开(公告)日：1996-06-07
申请号：JP30997794
申请日：1994-11-18
申请人： VICTOR COMPANY OF JAPAN
发明人： NAGANO HIROBUMI
IPC分类号： G11B7/24 , G11B7/00 , G11B7/005 , G11B7/007 , G11B7/26 , G11B19/04 , G11B19/12 , G11B20/12 , G11B27/00
摘要： PURPOSE: To effectively prevent unauthorized copying without affecting ordinary operation. CONSTITUTION: A security track 14 on a disk 10 is formed as a spiral different from the spiral of data tracks 12. Even if, therefore, the data is wholly copied on another disk by continuously reproducing the data tracks 12, the copying of the data of the security track 14 is infeasible. Only the data tracks 12 are accessed and the security track 14 is not accessed at the time of ordinary reproduction and, therefore, such trouble as occurrence of a tracking error by a protect code does not arise.

7. 发明专利

JPH07121907A OPTICAL DISK AND CHECKING APPARATUS THEREFOR 失效
公开(公告)号：JPH07121907A
公开(公告)日：1995-05-12
申请号：JP20713693
申请日：1993-07-29
申请人： VICTOR COMPANY OF JAPAN
发明人： OZAKI KAZUHISA , KAYANUMA KANJI , NAGANO HIROBUMI
IPC分类号： G01R31/00 , G06F12/14 , G06F21/24 , G11B7/00 , G11B7/004 , G11B7/007 , G11B7/24 , G11B7/26 , G11B19/04 , G11B20/00
摘要： PURPOSE:To obtain an optical disk and a checking apparatus which allows the preventing of any wrong disc copy better. CONSTITUTION:When a setting of a disk 10 is detected with a disk setting detector 12, the detection thereof is reported to a microcomputer 24 to make a reference to addresses AD1-AD3 of a flaw pit DP in a memory 26. Then, a direction for driving is provided to a disk drive section 14 and a pickup drive section 18 from the microcomputer 24 and address parts thereof are read out with a pickup 16. A tracking error signal is supplied to the microcomputer 24 from a head amplifier circuit 20 and a signal processing circuit 22. The tracking error signal increases in any flaw pit DP. When a flaw pit DP exists, a normal disk is determined. Otherwise, a copy disk is identified.

8. 发明专利

JP2000182245A DEVICE AND METHOD FOR RECORDING AND REPRODUCTION OF OPTICAL DISK 失效
公开(公告)号：JP2000182245A
公开(公告)日：2000-06-30
申请号：JP37532598
申请日：1998-12-14
申请人： VICTOR COMPANY OF JAPAN
发明人： EGUCHI HIDEJI , NAGANO HIROBUMI , UENO TOMONORI
IPC分类号： G11B7/00 , G11B7/0045
摘要： PROBLEM TO BE SOLVED: To provide a recording and reproducing device for an optical disk which can record information in the best state even if recording characteristics of the optical disk vary owing to the inner and outer peripheral difference in sensitivity, inner and outer periphery difference in skew(tilt), and temperature variation. SOLUTION: The recording and reproducing device 2 which records and reproduces information on and from the rewritable optical disk 1 is equipped with an optical pickup 4 which records and reproduces the information on and from the optical disk with laser light, a control means 19 which allows the pickup to record and reproduce the information intermittently, a laser power memory 17 which stores the power of the laser light at the time of information recording, a jitter measuring means 15 which measures the jitters of a reproduced signal obtained when the information is reproduced, and a laser power setting means 18 which sets laser light power minimizing the quantity of the jitters measured before by referring to the storage contents of the laser power memory. Consequently, the information is recorded in the best state even if the recording characteristics of the optical disk vary on the disk surface owing to the inner/outer peripheral difference in sensitivity, inner/outer peripheral difference in skew (tilt), and temperature variation.

9. 发明专利

JP2000132870A OPTICAL INFORMATION RECORDING MEDIUM, ITS MANUFACTURE AND ITS REPRODUCING DEVICE 失效
公开(公告)号：JP2000132870A
公开(公告)日：2000-05-12
申请号：JP30514898
申请日：1998-10-27
申请人： VICTOR COMPANY OF JAPAN
发明人： NAGANO HIROBUMI
IPC分类号： G11B7/24 , G11B7/007 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To prevent a protect code contained in a recorded signal from being read by conventionally reproducing the recorded signal recorded on a disk, and to provide an optical information recording medium permitting to record a protect code in any place without involvement of physical damage on the disk, and thereby prevent the disk from illegal copy. SOLUTION: This is an optical disk A formed by sequentially laminating a substrate 1 having rows of pits 5 or guide grooves arranged in a concentric circular form or a spiral form at a specified track pitch, a photo-chromic layer 2 made of a photo-chromic material formed on a part of or a whole surface of the substrate 1, and a reflecting layer 3 on the photo-chromic layer 23. Copy preventive information such as a bar code, characters, a pattern, etc., are recorded on the photo-chromic layer by varying an optical characteristics of the photo-chromic layer 2 by irradiating the layer with ultraviolet ray or laser light.

10. 发明专利

JPH08124171A OPTICAL DISK AND ITS RECORDER 失效
公开(公告)号：JPH08124171A
公开(公告)日：1996-05-17
申请号：JP28732094
申请日：1994-10-27
申请人： VICTOR COMPANY OF JAPAN
发明人： OZAKI KAZUHISA , NAGANO HIROBUMI
IPC分类号： G11B7/24 , G11B7/00 , G11B7/004 , G11B7/007 , G11B7/095 , G11B19/02 , G11B19/04
摘要： PURPOSE: To excellently maintain a C/N by making phases of signal waveforms of both wobbled data blocks being adjacent across the not wobbled data block opposite to each other. CONSTITUTION: The data blocks of tracks Trn-1 , Trn+1 wobbling at a track pitch (p) across the not wobbled data block of the track Trn of frame number 0, 2, 4... and adjacent to the block Trn are provided. Then, the phases of a wobbling waveform c1 in the frame numbers 0, 2, 4 of the track Trn-1 and the wobbling waveform c3 in the frame numbers 0, 2, 4 of the track Trn+1 are made the opposite phases shifting by 180 deg. each other. Thus, an unjustly copied disk is discriminated by detecting a peculiar pit, and the C/N is maintained excellently.

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