专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 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.

22. 发明专利

JPH01317248A OVERWRITE SYSTEM FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH01317248A
公开(公告)日：1989-12-21
申请号：JP14931688
申请日：1988-06-16
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105
摘要： PURPOSE:To realize a writing action while carrying out an erasing action by forming a gap between two spots formed by a 2-beam optical head. CONSTITUTION:A 2-beam optical head 5 emitts a leading erasing beam 6 and a subsequent recording beam 7 to the tracks of a magneto-optical recording medium 4 exclusive for single-side recording jobs. A magnetic field generating means 8 which produces an erasing external magnetic field is set with no contact to the opposite side of the medium 4 corresponding to the surface irradiated by the beam 6. Then the means 8 forms a closed magnetic path having a prescribed gap 9. The head 5 emitts the beam 6 to an area where the leaked magnetic flux of the line of magnetic force produced at one of two magnetic poles opposite to the gap 9 passes through the medium 4. At the same time, the head 5 emitts the beam 7 to an area where the leaked magnetic flux passes through the medium 4 in the opposite direction since said magnetic lux forms a closed magnetic pathe with the other magnetic pole. Thus both the erasing and writing actions are carried out at one time.

23. 发明专利

JPS6461719A SCANNING LENS 失效
公开(公告)号：JPS6461719A
公开(公告)日：1989-03-08
申请号：JP21872587
申请日：1987-09-01
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO , ITAMI SATOSHI , ABE FUMITAKA
IPC分类号： G02B26/10
摘要： PURPOSE:To decrease the number of components by adhering a metallic film to a reflecting surface for a deflected laser beam, and uniting the reflecting surface with the scanning lens in level with the reflecting surface. CONSTITUTION:The laser light beam 6 is deflected by a polarizing polygon mirror 2 and enters the scanning lens 10 from a surface S1 on an incidence lens surface 15. The lens 10 has its lens main body 11 molded out of synthetic resin, a triangular plate part 13 is aligned with the surface S1, and a projection lens surface 16 is arranged opposite a photosensitive body 5. The incident beam travels in the plate part 13 to reaches the arrival surface and deflected downward and reflected by 90 deg. by the reflecting surface 12 where the metallic film 18 is adhered to become a laser beam 6a. The beam 6a scans on the photosensitive drum 5 from the projection lens surface 16. Further, the incidence lens surface 15 is concave, the projection surface 16 is convex, and they are both aspherical. In said constitution, the reflecting surface is united with the lens main body to decrease the number of components.

24. 发明专利

JP2009223962A Information recording medium and information storage device 审中-公开
标题翻译：信息记录介质和信息存储设备
公开(公告)号：JP2009223962A
公开(公告)日：2009-10-01
申请号：JP2008068169
申请日：2008-03-17
申请人： Fujitsu Ltd , 富士通株式会社
发明人： OZAWA YASUYUKI , IZUMI HARUHIKO
IPC分类号： G11B5/82 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To provide an information recording medium wherein a region on the medium is made of effective use and to provide an information storage device. SOLUTION: The information recording medium 110 is provided with a substrate S, a plurality of first recording dots 111 which are circularly arranged on the substrate S at a mutual angular interval of a prescribed first circular angle λ1 and in which information is magnetically recorded, a plurality of second recording dots 112 which are circularly arranged on the inner side or outer side of the circles along the circles of the first recording dots at a mutual angular interval of a second circular angle λ2 different from the first circular angle λ1 and in which information is magnetically recorded and a bit row 115 interposed between the circles of the first and the second recording dots, circularly arranged along the circles at a mutual angular interval equal to the angular interval of one of the first and the second recording dots and representing read-only information. COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供一种信息记录介质，其中介质上的区域被有效地使用并且提供信息存储装置。解决方案：信息记录介质110设置有基板S，多个第一记录点111，其以规定的第一圆角度λ1的相互间隔圆周布置在基板S上，并且其中磁信息记录有多个第二记录点112，它们以与第一圆形角度λ1不同的第二圆角θ2的相互角间隔沿着第一记录点的圆圈圆周地布置在圆的内侧或外侧，以及其中信息被磁记录，并且位列115插入在第一和第二记录点的圆圈之间，以等于第一和第二记录点之一的角度间隔的相等角度间隔沿着圆形排列;以及表示只读信息。版权所有（C）2010，JPO＆INPIT

25. 发明专利

JP2003091899A MAGNETO-OPTICAL MEDIUM AND REPRODUCING DEVICE FOR THE SAME 审中-公开
公开(公告)号：JP2003091899A
公开(公告)日：2003-03-28
申请号：JP2002184953
申请日：2002-06-25
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO
IPC分类号： G11B11/105
摘要： PROBLEM TO BE SOLVED: To provide a magneto-optical medium with which both of a magneto- optical recording segment and preformat recording segment can be well reproduced by forming the magneto-optical recording segment and the preformat recording segment to the same recording line density and making the shortest pit length twice the mark length. SOLUTION: A recording track 11 of the magneto-optical recording segment is subjected to position recording making the presence and absence of the recording mark 12 correspondent to '1' and '0' of data and a recording track 13 of the preformat recording segment is subjected to edge recording making the presence and absence of the edges (front edge and rear edge) of the recording pits 14 correspondent to '1' and '0' of the data. The recording line density in both the recording segments is the same and the length of the shortest pit is twice the length of one mark.

26. 发明专利

JP2001291343A DATA REPRODUCING SYSTEM FROM OPTICAL DISK 失效
公开(公告)号：JP2001291343A
公开(公告)日：2001-10-19
申请号：JP2001079590
申请日：2001-03-19
申请人： FUJITSU LTD
发明人： TAGUCHI MASAKAZU , IZUMI HARUHIKO
IPC分类号： G11B20/14 , G11B20/10
摘要： PROBLEM TO BE SOLVED: To provide a data reproducing system which is capable of correctly detecting data by assuring a detection margin for data detection. SOLUTION: This data reproducing system has a signal reproducing means, a clock signal forming means (30) which forms synchronous clock signals, a sampling means (13) which samples the reproduced signals in synchronization with the synchronous clock signals, a maximum likelihood data detecting means (14) which operates in synchronization with the synchronous clock signals and decides the most likely data to be reproduced in accordance with the sampling data, a phase difference detecting means (145) which detects the phase difference between the phase of the synchronous clock signals and the point to be sampled of the reproduced signals and a phase regulating means (30) which regulates the phase difference so as to eliminate the phase difference error in accordance with the phase difference.

27. 发明专利

JP2001291329A DATA REPRODUCING SYSTEM FORM OPTICAL DISK 失效
公开(公告)号：JP2001291329A
公开(公告)日：2001-10-19
申请号：JP2001079591
申请日：2001-03-19
申请人： FUJITSU LTD
发明人： TAGUCHI MASAKAZU , IZUMI HARUHIKO
IPC分类号： G11B20/10 , G11B20/14
摘要： PROBLEM TO BE SOLVED: To provide a data reproducing system of an optical disk which can correctly detect data by assuring a detection margin for data detection. SOLUTION: This data reproducing system has a signal reproducing means, a sampling means which samples reproduced signals at prescribed timing, a maximum likelihood data detecting means which defines the most probable data to be reproduced by using the arithmetic data obtained in accordance with the sampling data and the prescribed constant data, a data forming means which forms recording data from the data defined by the maximum likelihood data detecting means in accordance with the sampling data obtained in data regions in respective sectors and an initial value computing means which computes the initial values of the arithmetic data in accordance with the sampling data obtained in VFO regions in the respective sectors.

28. 发明专利

JP2001289607A METHOD AND DEVICE FOR DETECTING OSCILLATING ANGLE AND OPTICAL DISK DEVICE 失效
公开(公告)号：JP2001289607A
公开(公告)日：2001-10-19
申请号：JP2000103894
申请日：2000-04-05
申请人： FUJITSU LTD
发明人： IZUMI HARUHIKO
IPC分类号： G01B7/30 , G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide a method and device for detecting an oscillating angle by which capacitance variation can be detected easily and the oscillating angle of a galvanometer mirror can also be detected easily with high accuracy and an optical disk device. SOLUTION: The device for detecting oscillating angle is provided with a mobile section equipped with a reflecting mirror, a supporting section which supports the mobile section in an oscillation possible state on a fixed section, and a driving section 18 which oscillates the mobile section by generating an electrostatic attracting force between the mobile section and a fixed section. The device is also provided with a signal impressing section 28 which impresses a signal for detection having a higher frequency than the driving signal which oscillates the mobile section has and amplitude detecting sections 22 and 24 which detect the amplitude of the output signal corresponding to a capacitance which changes following the oscillation of the mobile section.

29. 发明专利

JP2000215453A METHOD AND DEVICE FOR CONTROLLING POWER OF IRRADIATION BEAM TO RECORDING MEDIUM AND INFORMATION RECORDED USING IT 失效
公开(公告)号：JP2000215453A
公开(公告)日：2000-08-04
申请号：JP1143299
申请日：1999-01-20
申请人： FUJITSU LTD
发明人： NAKAO YOSHIHIRO , IZUMI HARUHIKO
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/007 , G11B7/125 , G11B7/1267 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To determine the optimum luminescent power, which allows maximally pulling out the power of an irradiation beam to a recording medium within limits of a maximum output of a light source and a maximum convergent rate of an optical system, with the number of trial write times as little as possible. SOLUTION: This method is provided with the steps (#101-#105) fixing bottom power of pulse luminescence, changing peak power and performing trial write when a beam from the light source pulse emitting light for recording information on the recording medium is converged by an objective lens, and the recording medium is irradiated with the beam, the step (#106) calculating optimum mean power from the bottom power and the peak power of the optimum conditions obtained from the trial write and the step (#107) redetermining the peak power and the bottom power by the calculation so as to lower the peak power and to increase the bottom power, based on the optimum mean power.

30. 发明专利

JP2000149476A RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JP2000149476A
公开(公告)日：2000-05-30
申请号：JP31753198
申请日：1998-11-09
申请人： FUJITSU LTD
发明人： SATO TADASHI , IZUMI HARUHIKO , KAWASAKI GORO , SHIMOKAWA SATOSHI
IPC分类号： G11B5/596 , G11B7/08 , G11B7/12 , G11B7/122 , G11B11/105 , G11B17/32 , G11B21/21 , G11B25/04
摘要： PROBLEM TO BE SOLVED: To keep the floating amount of a slider constant at the various places in the radial direction of a recording disk which is rotated at a constant speed with a simple constitution, in a device for recording/reproducing the recording disk provided in the state incorporated in the cartridge. SOLUTION: In the recording/reproducing device for recording and/or reproducing the recording disk 10 in the disk cartridge by the use of the disk cartridge 20 having the rectangular outside shape and incorporating the recording disk 10 therein and also being constituted so that a part of the recording disk 10 appears from an opening window 21 with the specified width extending to the radial direction of the recording disk along the center line, a straight advance driving mechanism 3 and the slider 40 which is mounted on this straight advance driving mechanism through a suspension 34 and also floated against the surface of the rotating recording disk 10, are provided, and also the moving course Cs of this slider 40 is inclined against a center line CL of the opening window 21 of the disk cartridge 20.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式