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1. 发明专利

JPS6348658A ROTATION CONTROL DEVICE 失效
公开(公告)号：JPS6348658A
公开(公告)日：1988-03-01
申请号：JP19052486
申请日：1986-08-15
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KASAI MASUO , NUNOMURA TOYOYUKI
IPC分类号： G11B19/28
摘要： PURPOSE:To perform the rotation control having no effect of a slit plate eccentricity with high accuracy even using the rotary encoder having a detector by obtaining the error signal cancelling the control error only synchronized with the rotation and performing the rotation control. CONSTITUTION:The average of the control errors in the output of the rotary encoder 6 including the effect of a slit plate eccentricity and a reference signal is stored over one rotary term as the function of the time or rotary angle. This average signal is then substracted from the control error on each corresponding time or rotary angle. The slit plate fitting eccentricity of the rotary encoder 6 is mechanical and has a reproducibility for the rotation, so with removing that only from the error signal of the rotation control the control is performed only for the random disturbance not synchronizing with the rotation of a windage loss, etc.

2. 发明专利

JPH0384748A OPTICAL INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH0384748A
公开(公告)日：1991-04-10
申请号：JP21855889
申请日：1989-08-28
申请人： HITACHI MAXELL , HITACHI LTD
发明人： YASUI TOSHIAKI , NUNOMURA TOYOYUKI , WATANABE HITOSHI , YAGI MASAHIDE , ITO SHO
IPC分类号： G11B7/24
摘要： PURPOSE:To provide a higher recording density and smaller crosstalks by adequately adjusting the depth of guiding grooves according to the sectional shape and pitch of the guiding grooves. CONSTITUTION:The guiding grooves 4 are formed to have the depth d1 of (lambda/10n to lambda/16n)X(1.5 to 1.6) when the sectional shape of the guiding grooves 4 is formed to an approximately triangular shape, the pitch P of the refractive index to 1.0 to 1.5 mum and the wavelength of light for reproducing as lambda and the refractive index of a transparent substrate 2 as (n). Many tracks can be arranged in the recording of a specified area and the recording density in the direction where the guiding grooves are arranged is increased when the track pitch is diminished. The wavelength of the light for recording/reproducing is shortened and the pitch length of prepits and add-on pits is shortened as the track pitch is smaller and, therefore, the recording density can be increased in the direction along the guiding grooves as well. On the other hand, the crosstalks are decreased when the guiding grooves of the smaller pitch are formed in such a manner.

3. 发明专利

JPH01300429A DRAW TYPE OPTICAL INFORMATION RECORDING MEDIUM, OPTICLAL INFORMATION RECORDING MEDIUM DRIVING DEVICE AND MASTER DISK CUTTING DEVICE 失效
公开(公告)号：JPH01300429A
公开(公告)日：1989-12-04
申请号：JP13031388
申请日：1988-05-30
申请人： HITACHI MAXELL , HITACHI LTD
发明人： NUNOMURA TOYOYUKI , SAITO ATSUSHI , MAEDA TAKESHI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/007 , G11B7/24 , G11B7/26
摘要： PURPOSE:To execute the transmission and reception of signals between DRAW type information recording media and to enable cutting of the master disk thereof by providing phase correction parts which invert the phase of the information recorded in the regions of preformat parts and data parts to a non-recording state behind said parts. CONSTITUTION:The phase correction parts 8, 15 which invert the phases of the information recorded in the regions 5, 6 to the non-recording state are provided behind the preformat parts 5 and data parts 6 of respective sectors formed by dividing the recording regions. The final address pits can be formed to the type of closing the rear edge thereof if the phase correction part 8 which inverts the phases of the address signal recorded behind the preformat part 5 is provided. The final recording part can be formed to the type of closing the rear edge thereof if the phase correction part 15 which inverts the phase of the user information recorded behind the data part 6 to the non-recording state is provided. The transmission and reception of the signals are executed between the DRAW type information recording media in this way and the cutting of the master disk for said media is enabled.

4. 发明专利

JPS63304307A SPEED CONTROLLER 失效
公开(公告)号：JPS63304307A
公开(公告)日：1988-12-12
申请号：JP13981187
申请日：1987-06-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ANDO MASAAKI , NUNOMURA TOYOYUKI , KASAI MASUO , HARA FUMIO , HAMAMOTO NOBUO
IPC分类号： G05D13/62
摘要： PURPOSE:To realize the speed control with accuracy by detecting continuously the phase difference between a reference speed command pulse and the up-pulse outputted from a laser length measuring device via a phase comparator and feeding said phase difference back to a drive motor via a motor control circuit. CONSTITUTION:A speed servo circuit consists of a laser length measuring device and a pulse converter 4 and the revolutions of a motor 1 are turned into the linear motions by a mechanism part 2. These linear motions are measured by a laser length measuring device 3 and changed into the up/down signals by the converter 4. These up/down signals are inputted to a selector 5 and the up or down signal is selected according to the positive or negative direction feed of a direction signal 6. The selected up or down signal is inputted to a phase comparator 7 and the phase difference is detected by the comparator 7 between said selected signal and the reference speed command pulse received from a speed command reference pulse 8. Then the output of a phase/voltage converter 9 is fed back to the motor 1 for speed control of the motor 1.

5. 发明专利

JPH01211367A CIRCUIT FOR CONTROLLING DRIVE FOR MASTER DISK RECORDER 失效
公开(公告)号：JPH01211367A
公开(公告)日：1989-08-24
申请号：JP3531688
申请日：1988-02-19
申请人： HITACHI MAXELL , HITACHI LTD
发明人： NUNOMURA TOYOYUKI , KASAI MASUO
IPC分类号： G11B19/28 , G11B19/247
摘要： PURPOSE:To set a track pitch with high accuracy by dividing original clocks with 1st and 2nd dividers and respectively using the outputs of the 1st and 2nd dividers as the reference clocks of a rotation driving mechanism and feeding mechanism. CONSTITUTION:Original clocks generated from an original clock generating section 1 are divided into 1/N by means of a divider 2 and reference clocks CF are formed and divided into 1/M by a divider 3 and reference clocks CSP are formed. Then motor speed signals C'F which are proportional to the rotating speed of a head feeding motor 8 are phase-compared with the reference clocks CF at a phase comparator 4 and the rotating speed of the motor 8 is controlled by means of the phase error signal produced as a result of the comparison. Similarly, motor speed signals C'SP which are proportional to the rotating speed of a master disk rotating motor 9 are phase-compared with the reference clocks CSP at a phase comparator 5 and the rotating speed of the master disk rotating motor 9 is controlled. Therefore, even if the frequency of the original clocks changes, the frequencies of the reference clocks CSP and CF simultaneously change and the rotating speed of a master disk is always maintained in a fixed state and, as a result, the track pitch is maintained constantly.

6. 发明专利

JP2001084586A OPTICAL DISK EVALUATION METHOD 失效
公开(公告)号：JP2001084586A
公开(公告)日：2001-03-30
申请号：JP2000249404
申请日：2000-08-21
申请人： HITACHI MAXELL
发明人： GOTO TAKAYUKI , NUNOMURA TOYOYUKI , IIDA TAMOTSU , KUWABARA KATSUMI
IPC分类号： G11B7/004 , G11B7/26 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To realize an optical disk evaluation method capable of detecting the number of defects or the number of errors actually coming into problem for the optical disk. SOLUTION: This method is arranged so that a 1st defective position detecting signal for detecting an optical disk reproducing signal by a certain threshold and a 2nd defect detecting signal obtained by expanding the defect with the plural detection unit lengths more than two before and after this defective position detecting signal are obtained, and also a 3rd defect detecting signal is obtained, which includes the plural 1st defect detecting signals including an overlapped part of the 2nd defect detecting signal as one defect signal when the defective signal exists such as overlapping the defective position of the 2nd defect detecting signal.

7. 发明专利

JPH06176367A OPTICAL DISK AND ORIGINAL DISK RECORDER 失效
公开(公告)号：JPH06176367A
公开(公告)日：1994-06-24
申请号：JP32202092
申请日：1992-12-01
申请人： HITACHI MAXELL
发明人： NUNOMURA TOYOYUKI
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/007 , G11B7/24 , G11B7/26
摘要： PURPOSE:To obtain an optical disk in a variable track pitch system with an excellent tracking characteristic and an original disk recorder capable of manufacturing the optical disk with high precision. CONSTITUTION:A recording area 1 is divided to plural zones 4a-4d with a concentric circular shape. The more the zone is in an outer peripheral side. The more the pitch (p) of a track 3 formed to a spiral shape or the concentric circular shape in relevant zone is made narrower. A transitional area 4 whose track pitch is changed gradually is provided on the switching part of each zone adjacent each other from the track pitch of the zone in an inner peripheral side to the track pitch of the zone in the outer peripheral side. The rotational speed of a feed motor 17 moving in linear a recording optical system 15 in the radial direction of an original disk 11 is controlled by a track address from a formater 33 outputting a preformat signal according to the track address to the recording optical system.

8. 发明专利

JPH04345921A OPTICAL DISK RECORDING DEVICE 失效
公开(公告)号：JPH04345921A
公开(公告)日：1992-12-01
申请号：JP14526691
申请日：1991-05-22
申请人： HITACHI MAXELL
发明人： YASUI TOSHIAKI , NUNOMURA TOYOYUKI , IIDA TAMOTSU
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125
摘要： PURPOSE:To obtain an optical disk recording device which can set the width of a long pit at the value equivalent to the width of a short pit. CONSTITUTION:A laser light source 5 is provided together with an objective lens 10, a light intensity modulator 7 set on an optical path reaching the lens 10 from the light source 5, a signal source 3 which supplies the recording signal to the modulator 7, and a signal processing part 4 formed between the surface 3 and the modulator 7. The pert 4 divides a recording signal having its pulse width larger than the pulse cycle of a reference clock by a prescribed multiple into plural signals having the pulse widths smaller than the pulse cycle of the reference clock by a prescribed multiple. Then the gaps are secured among these divided signals, and these signals are synthesized and outputted as the recording signals.

9. 发明专利

JPH0444818B2 失效
公开(公告)号：JPH0444818B2
公开(公告)日：1992-07-22
申请号：JP6170589
申请日：1989-03-14
申请人： HITACHI MAXELL
发明人： NUNOMURA TOYOYUKI
IPC分类号： G11B7/26 , G11B7/00 , G11B7/004 , G11B7/24

10. 发明专利

JPH02263364A SIGNAL EVALUATING DEVICE FOR INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH02263364A
公开(公告)日：1990-10-26
申请号：JP8151489
申请日：1989-04-03
申请人： HITACHI MAXELL
发明人： NUNOMURA TOYOYUKI , IIDA TAMOTSU
IPC分类号： G11B20/18
摘要： PURPOSE:To surely evaluate a signal even at the time of impossibility of detection of a signal pattern due to a defect or the like by providing an artificial reference signal generating part which generates an artificial reference signal at the time of not detecting the signal pattern in a predeterminate position. CONSTITUTION:An A/D converter 2 which quantizes a reproduced signal, a memory part 3 where quantized data is stored, and an arithmetic processing part 5 which evaluates the signal are provided. An artificial reference signal generating part 80 is provided which generates the artificial reference signal like an artificial synchronizing signal at the time of not detecting the signal pattern in the reproduced signal at a predeterminate time. Thus, the signal is surely evaluated though the signal pattern cannot be detected by a defect.

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