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1. 发明专利

JP2002342981A OPTICAL DISK MEDIUM, OPTICAL DISK DRIVE AND OPTICAL ORIGINAL DISK RECORDER 审中-公开
公开(公告)号：JP2002342981A
公开(公告)日：2002-11-29
申请号：JP2001377062
申请日：2001-12-11
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/24 , G11B7/004 , G11B7/0045 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To make executable a high-density recording. SOLUTION: In an optical disk medium 1 on which main information is recorded along a wobbling track direction, address information 9 is recorded by wobbling discontinuity. Thus, a high-density recording is made executable by partially making wobbles discontinuous in wobbled continuous groove shape to from a straight groove.

2. 发明专利

JP2001216642A METHOD AND DEVICE FOR RECORDING OPTICAL MASTER DISK AND OPTICAL MASTER DISK 失效
公开(公告)号：JP2001216642A
公开(公告)日：2001-08-10
申请号：JP2000026237
申请日：2000-02-03
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/0045 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To provide a method and device for recording an optical master disk and the optical master disk capable of preparing an optical master disk, which is free from a difference in a bit modulation degree and reduces jitters even when the pulse length of a recording pulse is different and a long recording pit exists in an adjacent track. SOLUTION: An optical modulation control part 20 generates an exposure pulse ESIG forming a pre-pit, which is free from a difference of the bit modulation degree and reduces the jitters even when the pulse length of the recording pulse of a recording pulse string PSIG is different and the long recording pit exists in adjacent recording pulse strings +TRSIG and -TRSIG based on the string PSIG for recording in a glass disk 15, the string +TRSIG advanced by the portion of one track, the string -TRSIG delayed by the portion of one track and pulse length data nT of the string PSIG, thereby the optical intensity of the exposure pulse in an optical modulator 13 is controlled.

3. 发明专利

JP2000348354A FOCUS SERVO PULL-IN DEVICE FOR OPTICAL DISK 失效
公开(公告)号：JP2000348354A
公开(公告)日：2000-12-15
申请号：JP15944199
申请日：1999-06-07
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/085 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To reduce the focus servo deviation by securing the focus servo pull-in even though the thickness or reflectance of an optical disk to be recorded and reproduced is changed. SOLUTION: The focus servo pull-in is executed around the center of oscillation of an objective lens by driving a pickup 16a while making the objective lens in the optical pickup 16a oscillate by a sine wave generating circuit 12. To put it concretely, a switch SW2 is changed over to a compensation circuit 11 from the sine wave generating circuit 12 by a signal from a pull-in control circuit 21, and a focus error zero-cross signal is obtained from a focus error signal obtained by detecting the reflected light from a medium 18 by a focus error detecting circuit 14 and an RF signal which is the total reflected light obtained by a reflected light detecting circuit 15, then the focus servo pull-in is executed by detecting that the focus error zero-cross signal is generated with the nearly equal intervals.

4. 发明专利

JP2000182250A FOCUS SERVO ACQUISITION CONTROLLER 失效
公开(公告)号：JP2000182250A
公开(公告)日：2000-06-30
申请号：JP37546998
申请日：1998-12-15
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/085
摘要： PROBLEM TO BE SOLVED: To provide a focus servo acquisition controller which can perform safe and secure focus servo acquisition and defocusing detection even if a recording medium varies in thickness or reflection factor. SOLUTION: The controller is equipped with total reflection signal generating means 9 and 10 which detect the total reflection from the recording medium 1 and generate a total reflection signal, focusing point error signals generating means 8 and 11 which detect defocusing on the recording medium and generate a focusing point error signal, an objective driving means 6 which generates a sine-wave signal for moving up and down an objective 4 over the recording medium by sine-wave vibration and a cosine wave signal having a 90 deg. phase delay behind the sine-wave signal, and an OR means 12 which ORs the total reflection signal, focusing point error signal, and cosine-wave signal, thereby controlling the servo to the focusing position in the timing of the focusing point signal outputted by the OR means.

5. 发明专利

JPH0997433A OPTICAL DISK, DEVICE FOR RECORDING AND REPRODUCING OPTICAL DISK AND METHOD THEREFOR 失效
公开(公告)号：JPH0997433A
公开(公告)日：1997-04-08
申请号：JP27515295
申请日：1995-09-29
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/095
摘要： PROBLEM TO BE SOLVED: To accurately take out position information by superimposing a signal for showing the position information of optical disk over a synchronizing pit length in a disk capable of performing tracking control in utilizing a synchronizing pit. SOLUTION: When a zero-cross pulse interval 305 obtained from the synchronizing pit A is denoted as T0, and the zero-cross pulse interval 305 obtained from the synchronizing pit B is denoted as T1, the width of a last transition pulse 306 obtained as a result of continuity of T0 is TS, and the width of the last transition pulse 306 obtained as a result of a change from T0 to T1 is TL. Thus, by combining the synchronizing pits A and B, a binary signal different in pulse width is obtained. Consequently, the signal showing the disk information of the optical disk 101 can be superimposed over the synchronizing pit length.

6. 发明专利

JPH0453034A DEVICE FOR CONTROLLING OPTICAL AXIS OF LASER 失效
公开(公告)号：JPH0453034A
公开(公告)日：1992-02-20
申请号：JP16169790
申请日：1990-06-20
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/26 , G11B7/09 , G11B7/135 , G11B7/14
摘要： PURPOSE:To maintain the spot interval of two beams with high accuracy by photodetecting two beams reflected from a recording medium, calculating difference between the signals of the two beams, taking out relative position error signals in two directions and controlling the optical axis of one beam. CONSTITUTION:A quadripartite photodetector 4 is provided to photodetect the first and second beams reflected from a master disk 3 of an optical disk, and a relative position error signal detecting means 1 is provided to take out the signals in two directions from signals to be obtained by the first and second beams. Further, an optical axis control means 7 is provided to control the optical axis of one of the two beams as mentioned above based on the relative position error signals obtained by this means 1. Next, the two beams reflected from the master disk 3 are photodetected by the element 4, the difference between the signals obtained by those beams is calculated by using the means 1, the relative position error signals in two directions are taken out, and the optical axis of one beam is controlled by the means 7. Thus, the spot interval of two beams can be easily maintained with high accuracy and further with simple configuration.

7. 发明专利

JPH0430334A INFORMATION RECORDER 失效
公开(公告)号：JPH0430334A
公开(公告)日：1992-02-03
申请号：JP13671890
申请日：1990-05-25
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/26 , G11B7/085
摘要： PURPOSE:To attain recording with the excellent arrangement of an exposure pitch by detecting the fluctuation of a feeding position of a rotary controller, applying feedback so that deflection quantity is variable and connecting in irradiating position of a laser beam so as to cancel the fluctuation. CONSTITUTION:A turnable 2 is moved by the driving of a feeding motor 8, the displacement is detected by a position detection means 29 through a linear encoder 30 to output a feeding speed deviation signal of the turntable 2 is fed back to deflectors 25,26 to vary the deflection quantity, then even when a feeding deviation is varied with the position of the turntable 2, the change is corresponded with the correction of an image forming position of the laser beam by the variable deflection quantity and gooves or pit strings at a constant interval are formed on a glass disk 1 without needing any mechanical adjustment.

8. 发明专利

JPS61208631A METHOD FOR PULLING IN FOCUS OF OPTICAL DISC DEVICE 失效
公开(公告)号：JPS61208631A
公开(公告)日：1986-09-17
申请号：JP4974185
申请日：1985-03-13
申请人： RICOH KK
发明人： ENDO HIDEYASU , ITO YUJI
IPC分类号： G02B7/28 , G11B7/08 , G11B7/085 , G11B7/09
摘要： PURPOSE:To decrease the open loop gain and a focus pull-in time by obtaining a means value of an out of focus detection signal before the focus servo system is in operation while an optical disc is rotated and adjusting the focus to a position corresponding to the mean value. CONSTITUTION:The optical disc 2 is rotated by a driver and the out of focus detection signal from a differential amplifier 9 is inputted to a mean value circuit 16 via a servo switch 11 and its mean value is obtained. A microcomputer 12 detects a means value from the mean value circuit 16 and when the mean value is positive, it is discriminated to activate a stepping motor drive circuit 13 thereby moving an objective lens 1 upward and the mean value from the mean value circuit 16 is detected again. The microcomputer 12 repeats the operation and when the mean value from the mean value circuit 16 reaches zero, the stepping motor 14 is stopped. Then the open loop gain of the focus servo system is decreased and the focus pull-in time is reduced.

9. 发明专利

JP2002183957A OPTICAL MASTER DISK MANUFACTURING APPARATUS AND OPTICAL MASTER DISK 失效
公开(公告)号：JP2002183957A
公开(公告)日：2002-06-28
申请号：JP2000378118
申请日：2000-12-12
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/0045 , G11B7/125 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To provide an optical master disk manufacturing apparatus which is capable of forming pits which make it possible to obtain regenerative signals having decreased jitters and good symmetry by controlling a laser beam in such a manner that a stable light quantity is supplied to resist. SOLUTION: The optical master disk manufacturing apparatus which irradiates the surface of a photosensitive film with an pulse-like laser beam in accordance with recording pulse trains is equipped with a modulator control section 102 which increases the intensity of the laser beam emitted by a laser irradiation means with a decrease in the pulse length of the recording pulse trains and corrects the pulse length of the laser beam.

10. 发明专利

JPH117647A EXPOSURE DEVICE FOR MASTER OPTICAL DISK 失效
公开(公告)号：JPH117647A
公开(公告)日：1999-01-12
申请号：JP15886097
申请日：1997-06-16
申请人： RICOH KK
发明人： ENDO HIDEYASU
IPC分类号： G11B7/125 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To simplify a circuit for highly accurately forming an information pit in a master optical disk in an optimal shape and correcting a modulated signal from a signal modulator. SOLUTION: A signal modulator 21 outputs pulse modulated information to be written in an optical disk to a control circuit 22. This digital signal is extended by an OR circuit 31 and a delay element D0 and inputted to delay elements D1, D2,..., Dn and an AND circuit 32. A multiplexer 33 selects one of outputted signals from the delay elements D1, D2,..., Dn. A multiplexer 34 selects one from reference analog signals V1, V2,..., Vn. A switching element 35 is switched by a logical product signal outputted from the AND circuit 32, and the analog signal selected by the multiplexer 34 is switched ON/OFF. A pulse width detector 38 detects the pulse width of the digital signal inputted from the signal modulator 21 and, based on this detected signal, selection of one of the outputted signals from the delay elements D1, D2,..., Dn is performed by the multiplexer 33 and selection of one of the reference analog signals V1, V2,..., Vn is performed by the multiplexer 34.

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