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1. 发明专利

JP2002050084A ALIGNER FOR MASTER DISK 失效
公开(公告)号：JP2002050084A
公开(公告)日：2002-02-15
申请号：JP2000228552
申请日：2000-07-28
申请人： FUJITSU LTD
发明人： OZAWA YASUYUKI
IPC分类号： G03F7/20 , G11B7/0045 , G11B7/09 , G11B7/26 , G11B19/06
摘要： PROBLEM TO BE SOLVED: To provide an aligner for master disk capable of correcting a pit position highly precisely at a low cost by narrowing a measurement range for the deflection correction of an exposure beam. SOLUTION: The output Δtp of a phase comparator 31 is given to a loop filter and a voltage-controlled oscillator(VCO) 32, and is simultaneously given to a deflection correction circuit 22. The output of the loop filter and the VCO 32 is given to a formatter 34 as the output of a write clock PLL circuit. That is, it is given to the formatter 34 as a write clock signal WCLK which is a reference for pit formation. Pit formation timing is also fluctuated so as to follow the fluctuation of the rotation of a spindle motor 14, and thereby, the pit position accuracy in the circumferential direction is improved. Furthermore, the Δtp which is a jitter component which the write clock PLL circuit can not follow is given to a deflection correction circuit 22, and then the fine adjustment of the deflection angle in the circumferential direction of an electron beam is performed through a deflector 23.

2. 发明专利

JP2513594B2 失效
公开(公告)号：JP2513594B2
公开(公告)日：1996-07-03
申请号：JP22644584
申请日：1984-10-26
申请人： FUJITSU LTD
发明人： OZAWA YASUYUKI , HAMADA JUN , KASUYA TAKASHI
IPC分类号： H02K33/18 , H02K41/035

3. 发明专利

JPH06223393A ACTUATOR OF OPTICAL DISK DEVICE 失效
公开(公告)号：JPH06223393A
公开(公告)日：1994-08-12
申请号：JP1377393
申请日：1993-01-29
申请人： FUJITSU LTD
发明人： OTSUKA SHINICHI , OZAWA YASUYUKI , HAMAGUCHI SHINGO
IPC分类号： G11B7/09
摘要： PURPOSE:To provide an actuator of a four-wire supported system which is so designed as not to be affected by a force of inertia nearly at all even at the time of acceleration and deceleration of a carriage, regarding the actuator of an optical disk device. CONSTITUTION:An optical disk device conducts recording/reproduction of information by an optical means on a large number of tracks formed in the shape of concentric circles or spirally on a disk. In regard to an actuator wherein a movable part 12 including an objective lens 3 is supported by four wires 17 so that the objective lens 3 applying a light spot onto the disk can be controlled to be driven in the direction of the focus and the direction of the track, construction is so made that the four wires 17 mentioned above are arranged in the direction of movement of a carriage including the actuator.

4. 发明专利

JPH05128561A TRACKING ACTUATOR OF OPTICAL DISK DRIVE 失效
公开(公告)号：JPH05128561A
公开(公告)日：1993-05-25
申请号：JP28514391
申请日：1991-10-30
申请人： FUJITSU LTD
发明人： OTSUKA SHINICHI , OZAWA YASUYUKI , HAMAGUCHI SHINGO
IPC分类号： G11B7/085 , G11B7/09
摘要： PURPOSE:To provide a tracking actuator of an optical disk drive which can be made compact in size without accompanying the shift of an optical axis. CONSTITUTION:This tracking actuator is comprised of a parallel leaf spring mechanism 41 which translates a galvanomirror 47 in a perpendicular direction Z to an optical disk 3, a leaf spring member 46 mounted at the front end of the mechanism 41 for turning the galvanomirror, and an actuator 48 for working the force to the front end of the leaf spring member. The galvanomirror 47 is mounted at the front end of the leaf spring member 46. As the actuator 48 is driven, the parallel leaf spring mechanism 41 and the leaf spring member 46 are bent, so that the galvanomirror 47 is translated and turned. The galvanomirror 47 is so adapted as to shift actually in the same manner as when it turns and shifts around a virtual axis 50.

5. 发明专利

JPH0520609A EXTERNAL MAGNETIC FIELD GENERATOR FOR MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0520609A
公开(公告)日：1993-01-29
申请号：JP17134691
申请日：1991-07-11
申请人： FUJITSU LTD
发明人： OZAWA YASUYUKI , OTSUKA SHINICHI , FUJIMAKI TORU
IPC分类号： G11B5/02 , G11B5/11 , G11B11/10 , G11B11/105
摘要： PURPOSE:To realize a shortening of the time required for changing over the direction of the magnetic field exerting on a magneto-optical disk and also a reduction of a power consumption. CONSTITUTION:A pair of permanent magnets 41, 42 are fixed through a space 45. A magnetic shield plate 43 made by a soft magnetic material is provided mavably in the space 45. The magnetic shield plate 43 is moved by a linear motor 44, then the magnetic shield plate 43 is separated from one of the permanent magnets and attracted to another permanent magnet.

6. 发明专利

JPH04349249A TRACK ERROR DETECTING CIRCUIT FOR MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04349249A
公开(公告)日：1992-12-03
申请号：JP12093091
申请日：1991-05-27
申请人： FUJITSU LTD
发明人： OZAWA YASUYUKI , TEZUKA KOICHI
IPC分类号： G11B7/095 , G11B11/10 , G11B11/105
摘要： PURPOSE:To apply a 3-beam method to the track error detection of a magneto- optical disk by detecting a track error signal by either of an information signal amplitude detection system or an everage light quantity detecting system in accordance with the position, etc., of a beam. CONSTITUTION:A light source beam is branched to 3 beams and sub-beams Sb1 and Sb2 for recording reproduction are formed. For the output from a photodetector corresponding to the Sb1 and Sb2, an error detection is performed by average light quantity detecting circuits 10a and 10b at a part having no pit and at a ROM part having a pit, the error detection is performed by information signal amplitude detecting circuits 20a and 20b. The signals detected by two circuits 10a and 10b or 20a and 20b are added by adders 30a and 30b corresponding to the sub-beams Sb1 and Sb2 respectively and through an operational amplifier 40, a track error signal is detected. Thus, the 3-beam method can be applied to the track error of the magneto-optical disk.

7. 发明专利

JPH04339326A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04339326A
公开(公告)日：1992-11-26
申请号：JP11185391
申请日：1991-05-16
申请人： FUJITSU LTD
发明人： TEZUKA KOICHI , OZAWA YASUYUKI , HAMAGUCHI SHINGO , FUJIMAKI TORU
IPC分类号： G11B7/095 , G11B7/135
摘要： PURPOSE:To reduce the thickness of the device without degrading the high speed access and the deflection acceleration performance of a laser beam. CONSTITUTION:A laser unit 8B of a stationary optical part 5B is disposed and directed so that it can emit a laser beam 7B in a horizontal direction, a stationary reflection mirror 22 reflecting the laser beam downward is provided, and a tracking actuator 10 of the stationary optical part is constructed so that a movable reflection mirror 12 can displace within the incident surface (X-Z plane) of a reflected laser beam 23 reflected by the stationary reflection mirror 22.

8. 发明专利

JPH04188436A ACCESS CONTROL METHOD FOR OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH04188436A
公开(公告)日：1992-07-07
申请号：JP31944290
申请日：1990-11-22
申请人： FUJITSU LTD
发明人： HAMAGUCHI SHINGO , OZAWA YASUYUKI , NIMATA AKIO
IPC分类号： G11B7/085
摘要： PURPOSE:To change the moving mode in coarse control quickly into a follow-up mode in fine control by measuring the average speed by forcibly setting the moving speed of a light spot only at the decelerating speed for a specified tracking period, and obtaining the quick changing speed by using the average speed and a deceleration correcting table for converting the average speed into the quick changing speed. CONSTITUTION:The moving speed of a light spot is forcibly set only at the deceleration speed (or acceleration speed) for a specified period from a position which is separated from a target track by a specified distance, and the average speed at this period is measured. The measured average speed and a converting table for deceleration speed (or acceleration speed) for converting the average speed into a quick changing speed are used, and the quick changing speed at the specified track position is obtained. In this way, the speed is forcibly set at, e.g. the deceleration speed, and the average speed is obtained during this period. Therefore, as the correcting table, the table only for the deceleration can be used, and the moving mode in coarse control can be quickly changed into the follow-up mode in fine control in a safe pattern.

9. 发明专利

JPH041936A OPTICAL SIGNAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH041936A
公开(公告)日：1992-01-07
申请号：JP10189490
申请日：1990-04-17
申请人： FUJITSU LTD
发明人： MORITSUGU MASAHARU , OZAWA YASUYUKI
IPC分类号： G11B7/09
摘要： PURPOSE:To reduce the weight of a movable part and to make the part thin structive in the thickness direction by applying a separate optical system, disposing a galvanomirror on a fixed part and conforming the oscillating direction with the same plane as the surface of a medium. CONSTITUTION:A shaft 16b for oscillating the galvanomirror 16 is arranged in the vertical direction to the medium surface of a recording medium 6. Consequently, the shape and size of the galvanomirror 16 itself can be formed thin in the vertical direction. On the other hand, a reflected light beam emitted from the galvanomirror 16 is oscillated in a parallel plane 19 to the aforementioned medium surface, whereas this oscillating direction is converted into the moving direction (direction of an arrow A) of an objective lens 5 by an optical element having two reflecting surfaces. By this method, the weight of the movable part is reduced, and also thicknesswise thin formation is feasible.

10. 发明专利

JPH02210268A SPEED DETECTING CIRCUIT FOR ACTUATOR 失效
公开(公告)号：JPH02210268A
公开(公告)日：1990-08-21
申请号：JP3235689
申请日：1989-02-09
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO , OZAWA YASUYUKI , FUJIMAKI TORU
IPC分类号： G01P3/42 , G11B21/08
摘要： PURPOSE:To widen the frequency range while maintaining the sensitivity by adding the outputs of both differentiating and integrating circuit for the output of a position sensor. CONSTITUTION:The differentiating circuit 1 which differentiates the position sensor output of the actuator and the integrating circuit 2 which integrates a current flowing through the actuator are provided independently and the outputs of both the circuits 1 and 2 are added by an adding circuit 3 to detect the speed of the actuator. Then the time constants T1 and T2 of the circuits 1 and 2 are equalized to each other as shown an equation, where Bl is the power constant of the actuator (B: magnetic flux density, l: the length of coil crossing magnetic flux), M the mass of a movable part, Ps the position sensor sensitivity, Kc current detection sensitivity, G1 the gain of the circuit 1, G2 the gain of the circuit 2, and H the addition gain ratio (the gain of the circuit 3 to the integration output/the gain 3 of the circuit 3 to the differentiation output). Thus, the frequency range can be widened without decreasing the circuit gains and accurate speed detection is enabled regardless of fast speed variation.

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