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1. 发明专利

JPH0330152A SEEK CONTROL SYSTEM FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0330152A
公开(公告)日：1991-02-08
申请号：JP16404289
申请日：1989-06-28
申请人： HITACHI LTD
发明人： ISOZAKI JUN , HIBINO YOZO , SHISHIDA KAZUHISA , TATE YOSHIYUKI , YAMAGUCHI TAKASHI , GOTOU MARUTOMO , YONEDA FUKUO , SATO MASAHIKO , ISHIBASHI AKIRA
IPC分类号： G11B21/08
摘要： PURPOSE:To reduce the settling time after the end of seek even when the sampling frequency is low by calculating the rate of change of an input signal to an actuator positioning a head depending on the speed deviation and that of preceding and succeeding input signals and limiting the rate of change when the permissible value is exceeded. CONSTITUTION:A signal resulting from the rate of change in the speed deviation limited is obtained at the output of a saturation circuit 20 and the speed deviation is corrected into the limited rate of change in the speed deviation at the point of current sample time by adding the output of the saturation circuit 20 and a speed deviation DELTAvm(k-1) of one preceding sample by an adder 21. The corrected speed deviation is converted into an analog quantity by a D/A converter 22 and subjected to voltage/current conversion with a current amplifier 23, the current drives the actuator 24 to apply the seek control (speed control) of a magnetic head 2. Since the fluctuation of a manipulation variable is controlled, even when the sampling frequency is low, the setting time of seek control is shortened.

2. 发明专利

JPH02278583A CARTRIDGE FOR FLOPPY DISK 失效
公开(公告)号：JPH02278583A
公开(公告)日：1990-11-14
申请号：JP9957389
申请日：1989-04-19
申请人： HITACHI LTD , HITACHI MAXELL
发明人： SAKAGAMI KAEKO , YONEDA FUKUO , SATO YOSHIHIRO , TAKEUCHI YOSHINORI , TANAKA KATSUYUKI
IPC分类号： G11B23/033
摘要： PURPOSE:To enable stable recording and reproducing and to improve the durability of a magnetic disk by providing a means to suppress the surface oscillation of the magnetic disk in a hard case. CONSTITUTION:In the internal part of a hard case 3 in a cartridge 1, a stabilizing member 7 is arranged on the same reference surface as a magnetic disk 2. The surface of this stabilizing member 7 is formed to be a smooth surface or a soft material such as nonwoven fabric, etc., is attached to the surface. Then, even when the surface of the stabilizing member hits the disk 2, the disk is not damaged. Thus, the vibration of the disk 2, which is generated by pressure fluctuation in the flowing-out end of a negative pressure slider 5 and deformation caused by the negative pressure of the disk 2, can be suppressed. Accordingly, contact between the magnetic disk and a magnetic head is made stable and the reliability and wear resistance of recording and reproducing can be improved.

3. 发明专利

JPH02278580A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH02278580A
公开(公告)日：1990-11-14
申请号：JP9731589
申请日：1989-04-19
申请人： HITACHI LTD
发明人： GOTOU MARUTOMO , TANAKA KATSUYUKI , YONEDA FUKUO , ISOZAKI JUN , HIBINO YOZO , AMANO HIDEAKI , SHIRAISHI KAZUHISA , TOKIDA KATSUHIRO , ARAI TAKESHI , KOBASHI TETSUZO
IPC分类号： G11B21/10
摘要： PURPOSE:To reduce the falling component and eccentric component of thermal offtrack and to execute positioning with high accuracy by correspondently storing an index number and correction servo information and reproducing a correction servo signal. CONSTITUTION:With an INDEX signal, which is obtained once a turn, as a reference, a quantization correction servo signal generated from a data surface 13 in one time of rotation is stored to a storage device 7 of a microcomputer 1. At the time of track following-up operation, the INDEX number on the surface 14 is detected and on the basis of the INDEX number stored in the storage device 7 and correspondence relation between the correction servo signals, a correction servo signal 3 is reproduced to be added to a target value at the time of the track following-up operation. Thus, the falling component and eccentric component of the thermal offtrack can be enough reduced and even when the density of a data track is increased, the head positioning of the high accuracy can be executed without damaging a high-speed access.

4. 发明专利

JPH02192065A DOUBLE FACE MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH02192065A
公开(公告)日：1990-07-27
申请号：JP966389
申请日：1989-01-20
申请人： HITACHI MAXELL , HITACHI LTD
发明人： TANAKA YOSHITO , HAYASHI MASASHI , FUJIWARA HIDEO , YONEDA FUKUO , TANAKA KATSUYUKI
IPC分类号： G11B17/32 , G11B17/34
摘要： PURPOSE:To stably record information and to improve the durability of a magnetic disk by providing a specific groove part on the magnetic disk. CONSTITUTION:A magnetic core 7 of one magnetic head 2 or 3 is made to face a groove 11 of the other magnetic heads 3 or 2, and the magnetic core is brought into contact with a magnetic disk 1 by means of suitable press- contacting force by using the flexibility of the magnetic disk 1. Further on each second foot parts 12 of the first or second magnetic head 2 or 3 arranged on external or internal peripheral side of the magnetic disk 1, a negative pressure generating groove 13, which is made deeper from the upstream side in the rotation direction of the magnetic disk 1 toward the downstream side, is formed, when the disk 1 is rotated at high speed, the negative pressure is generated by the fluid force between the negative pressure generating groove 13 and the disk 1, and force to attract the disk 1 is operated. Consequently the vibration of the disk 1 generated by the high-speed rotation is absorbed, the magnetic heads 2 and 3 come in contact with the disk 1 at constant surface pressure, stable recording/reproducing is attained, and further the durability of the disk 1 is improved.

5. 发明专利

JPH0218748A RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0218748A
公开(公告)日：1990-01-23
申请号：JP16775688
申请日：1988-07-07
申请人： HITACHI LTD
发明人： YONEDA FUKUO , TANAKA KATSUYUKI , MIYAMOTO KAEKO
IPC分类号： G11B17/32
摘要： PURPOSE:To stablize the recording and reproducing of information with a magnetic head integrated in a negative pressure slider by causing the inclination of the negative pressure slider to be larger in an outer peripheral side rather than the inner peripheral side of a recording medium. CONSTITUTION:A negative pressure slider 3 is fit through a conversion supporting stand 4 to a mobile stand 5 so as to be brought into contact with a disk 1. This conversion supporting stand 4 is inclined in advance and can be moved in the radius direction of the disk 1 by the mobile stand 5 which loads this stand 4. On the other hand, a sliding board 8 is provided on the flowout edge side of the disk 1 in the mobile stand 5 and slided with a press guiding rod 7 which is inclined so as to be high when it is moved in the inner peripheral side of the disk 1. Accordingly, when the mobile stand 5 is moved from the outer peripheral side of the disk 1 to the inner peripheral side, as the stand is moved, the inclination of the mobile stand 5 is changed and the inclination of the loaded negative pressure slider 3 is also changed. Thus, the contact between the negative pressure slider and disk is made stable and the recording and reproducing of the information by the magnetic head, which is integrated in the negative pressure slider, can be stablized.

6. 发明专利

JPS6194263A Lamination type flexible disk device 失效
标题翻译：层压型柔性盘装置
公开(公告)号：JPS6194263A
公开(公告)日：1986-05-13
申请号：JP21410884
申请日：1984-10-15
申请人： Hitachi Ltd
发明人： SHIMIZU ISAO , YONEDA FUKUO , ISOZAKI JUN , TANAKA KATSUYUKI
IPC分类号： G11B17/28 , G11B17/02
CPC分类号： G11B17/021
摘要： PURPOSE:To miniaturize a flexible disk device including an air source by using a pressure tank. CONSTITUTION:A pressure tank 33 and a vacuum tank 34 are used to attain the miniaturization of three pumps 23-25. The pressure level of the tank 33 drops when an opening action is repeated, while the pressure level of the tank 34 increases. When the pressure of the tank 33 is lowered less than a set level, a pressure switch 26 works again to start a nozzle pressure pump 23. The actuation of the switch 26 is stopped at the upper limit of a range of the set pressure. While a vacuum pump 25 starts when the pressure of the tank 34 exceeds the upper limit of a range of the set pressure.
摘要翻译：目的：通过使用压力罐使包括气源的软盘装置小型化。构成：使用压力罐33和真空槽34来实现三个泵23-25的小型化。当罐34的压力水平升高时，重复打开动作时，罐33的压力水平下降。当罐33的压力降低到小于设定水平时，压力开关26再次工作以启动喷嘴压力泵23.开关26的致动停止在设定压力的范围的上限。当罐34的压力超过设定压力的范围的上限时，真空泵25启动。

7. 发明专利

JPS6042673B2 失效
公开(公告)号：JPS6042673B2
公开(公告)日：1985-09-24
申请号：JP10775876
申请日：1976-09-10
申请人： HITACHI LTD
发明人： KAWACHI MASATAKA , YONEDA FUKUO , TERAYAMA TAKAO
IPC分类号： G01S3/78 , G01S3/782 , H04N7/18 , H04Q9/00

8. 发明专利

JPS56122287A METHOD FOR OBTAINING HARD COPY FROM COLOR VIDEO SIGNAL 失效
公开(公告)号：JPS56122287A
公开(公告)日：1981-09-25
申请号：JP2405880
申请日：1980-02-29
申请人： HITACHI LTD
发明人： AZUMA MINEO , ITOU TAKAKIYO , YONEDA FUKUO
IPC分类号： H04N9/79 , B41J2/525 , H04N1/50
摘要： PURPOSE:To obtain a good color picture efficiently, by matching the spectral characteristic of the light beam from a white light source to the characteristic of a color printing paper to perform light modulation by a color video signal. CONSTITUTION:The light beam emitted from white light source 1 is incident to optical filter 2. These filters 2 have functions resembling spectral sensitivity characteristics of red, green, and blue lights of the color printing paper, and light beams which passed through filters 2 have spectral characteristics matched to characteristics of the color printing paper. Respective light beams incident from filters 2 to light modulators 4 are subjected to intensity modulation by video signals R, G and B input to modulators 4 from the external. Light beams subjected to intensity modulation are led to scanning system 6. This scanning system 6 condenses respective light beams of three colors into one light beam and focuses it onto color printing paper 8 stuck to rotary drum 7. Thus, a color hard copy is obtained by scanning of one frame.

9. 发明专利

JPS5577274A PHOTOTELEGRAPHY METHOD FOR COLOR PICTURE USING BLACKKANDDWHITE FILM 失效
公开(公告)号：JPS5577274A
公开(公告)日：1980-06-10
申请号：JP14996378
申请日：1978-12-06
申请人： HITACHI LTD
发明人： AZUMA MINEO , ITOU TAKAKIYO , HORI EIICHI , YONEDA FUKUO
IPC分类号： H04N1/48 , H04N1/46
摘要： PURPOSE:To shorten greatly a phototelegraphy time by eliminating a shear in image in reproduction by phototelegraphing the original picture of a black-and-white pricture recorded by a stripe filter with blue and red reflecting characteristics while color-separating it and mixing. CONSTITUTION:Transmitting rotary drum 1 is turned and optical system 20 is moved axially. As a result, a black-and-white picture printed on photographic paper 19 on drum 1 by a stripe filter with blue and red reflecting characteristics is scanned by light source 21 and also converted into an electric signal corresponding to green, red and blue by photoelectric tube 22. This signal is supplied to reception-side electric filter 23 by way of phototelegraphing path 7 and then color-separated into electric signals equivalent to green, red and blue. Those electric signals are converted by discharge tube 8 into photo signals, which are recorded as block-and-white images on photographic papers 28a-28c on receiving rotary drum 27. Those black- and-white pictures are optically mixed to obtain a color picture.

10. 发明专利

JPS517952A SUICHUKIKAINO KEISOKUHYOJISOCHI 失效
公开(公告)号：JPS517952A
公开(公告)日：1976-01-22
申请号：JP7831274
申请日：1974-07-10
申请人： HITACHI LTD
发明人： KAWAUCHI MASATAKA , YONEDA FUKUO
IPC分类号： E02F9/26 , B25J5/00 , B63C11/00 , B63C11/48 , E02F5/00 , E02F5/10 , E02F9/00 , G01D5/00 , G01S15/88 , G05D3/12 , G08C19/00

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