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1. 发明专利

JPH0434702A ROTARY MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0434702A
公开(公告)日：1992-02-05
申请号：JP13849890
申请日：1990-05-30
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： KAWACHI MASANORI , IBE MAKOTO , ITO TETSUO
IPC分类号： G11B5/02
摘要： PURPOSE:To fix a rotary transformer by adhering onto a disk with high reliability by providing a recessed pat including a thread hole for escaping air to a lower face of the disk so as to reduce a pumping pressure generated at screw tightening. CONSTITUTION:A recessed part (groove or chamfer) is provided to a fixing face of a disk 4 for mounting a rotary transformer 9 in order to relax or exclude a pumping action. That is, a spot facing J for air pool is provided to a lower end face B of the disk 4. When a screw 8 is tightened, since the pumping action by the screw 8 is relaxed because he volume is increased more than a volume of a conventional device by the presence of the air pool J, the pumping pressure exerted in the H direction to the rotary transformer 9 is reduced more than that of a conventional device. Thus, even when the screw is tightened after the rotary transformer 9 and the disk 4 are fixed by adhering, the possibility of coming-off of the rotary transformer 9 is precluded and the product with high reliability is realized.

2. 发明专利

JPH0391140A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0391140A
公开(公告)日：1991-04-16
申请号：JP22445289
申请日：1989-09-01
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IWAKURA MASAO , TAKEDA HIDEKAZU , NISHIDA IKUO , YAMASHITA YOSHIHARU , OOMORI MOTONORI , IYOTA KOJI , ITO TETSUO
IPC分类号： G11B15/665
摘要： PURPOSE:To enhance the utilization efficiency of a space and to make a device small in size and light in weight by making at least one of positioning and holding members which respectively position and hold plural guide posts for winding a magnetic tape around a cylinder movable. CONSTITUTION:At least one of the positioning and holding members 912 and 77 for holding the guide posts 910 and 73 at specified positions and in specified posture is set as the movable one, that is, the positioning and holding member 77. Namely, the loading/unloading of the other guide post is smoothly performed by previously retreating the holding member 77 for holding the guide post 73 which forms a specified tape traveling path at the specified position and in the specified posture from the moving path of the other guide post in course of loading/unloading. Thereafter, the holding member 77 is disposed at the specified position to secure the position and the posture of the guide post 73 without being restricted by the moving path of the other guide post. Thus, the utilization efficiency of the space is enhanced and the device is miniaturized.

3. 发明专利

JPH02210647A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02210647A
公开(公告)日：1990-08-22
申请号：JP2990989
申请日：1989-02-10
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： OOMORI HARUNORI , NISHIDA IKUO , IYOTA KOJI , TAKEDA HIDEKAZU , IWAKURA MASAO , ITO TETSUO
IPC分类号： G11B15/28 , G11B15/29 , G11B15/665
摘要： PURPOSE:To miniaturize and thin the device by arranging a capstan motor and a capstan on a surface side where the rotary cylinder of a chassis is mounted. CONSTITUTION:The capstan motor 5 is placed on a holder 6 mounted on a surface at a side where the rotary cylinder of the chassis 15 is mounted. The shaft 22 of the motor is extended to a chassis 15 side, and is used as the capstan. The height of the holder 6 is set so that the motor 5 to be placed on the holder can be set higher than that of a guide member on a guide base. Thereby, the guide base 10 is moved underneath the motor 5 on the middle way to move along the guide groove of a guide plate 9, and no obstruction occurs in a loading operation even when the motor 5 is arranged adjacently to the rotary cylinder. Thus, since the motor 5 can be mounted on the same plane on which the rotary cylinder of the chassis 15 is mounted, the thinning of the device can be attained.

4. 发明专利

JPH02148442A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02148442A
公开(公告)日：1990-06-07
申请号：JP30059488
申请日：1988-11-30
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： ITO TETSUO , NAGAI KIYUUICHIROU , KAWASHIMA HIROSHI
IPC分类号： G11B15/00
摘要： PURPOSE:To eliminate the need for switching an operation mode and to simplify the operating condition in frame photographing recording by absorbing the sagging of a magnetic tape accompanied with the lowering of tape tension in the finely reverse feeding mode of the magnetic tape with the aid of a sagging preventing member. CONSTITUTION:The rewinding operation of the tape in the midst of a frame photographing operation is performed only by the reverse rotation of a capstan 8 which does not accompany the operation of a supply reel 3 and the sagging caused by the reverse feeding of the tape 1 is absorbed by the sagging preventing member 12 so as to maintain the tape tension. Therefore, the switching of the operation mode of a mechanism, that means, the frequent switching of a brake band 17 from an actuation state to a non-actuation state becomes unnecessary. Thus, a time for frame photographing operation is shortened by a time for switching the operation mode of the mechanism and operability is improved, then the operating condition in frame photographing recording is simplified.

5. 发明专利

JPH01113954A FLEXIBLE MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01113954A
公开(公告)日：1989-05-02
申请号：JP27021487
申请日：1987-10-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IWAKURA MASAO , NAGAI KIYUUICHIROU , ITO TETSUO
IPC分类号： G11B17/34
摘要： PURPOSE:To suppress flapping of a disk on its outer peripheral side and to obtain stable contact between a head and the disk by forming a recessed groove part parallel to a head moving course on an opposite surface of a stabilizing member to the disk and minimizing the depth of the recessed groove part on its outer peripheral side so far as not to allow the bottom of the recessed part to be in contact with the disk. CONSTITUTION:The recessed groove part 3b is provided in the middle of the opposite surface between 3a1 and 3a2 of the stabilizing part 3 to the disk as parallel to the radial direction of the disk 2, i.e., the head moving direction, whereas the recessed groove part 3b has on its side of the periphery of the disk 2 a slope 3b1 inclined in the direction of diminishing the depth of the recessed groove part 3b as well as in the radial direction of the disk 2. The airflow attending upon the rotation of the disk 2 enters into the recessed groove part 3b, where the air flows from the inner peripheral side of the recessed groove part 3b to the outer peripheral side. By this method, a positive pressure is generated on the outer peripheral part of the recessed groove part 3b, and an air damper effect due to the elasticity and viscosity of air is effective, so as to suppress the flapping of the disk 2, thus obtaining the stable contact between the head and the disk 2.

6. 发明专利

JPS6430066A FLEXIBLE MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6430066A
公开(公告)日：1989-01-31
申请号：JP18340587
申请日：1987-07-24
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IWAKURA MASAO , NAGAI KIYUUICHIROU , ITO TETSUO
IPC分类号： G11B17/34
摘要： PURPOSE:To obtain an always stable head output by forming a part close to the inner peripheral side of a disk out of two ridgelines to be edge parts formed by placing a recessed groove part on a disk-opposed face of a stabilizing member between them so as to be separated from the disk in the direction to the inner peripheral side of the disk. CONSTITUTION:A part 3f of the two ridgelines 3e parallel with a disk rotating plane 3c placing the recessed groove part 3d of the stabilizing member 3 between them on the inner peripheral side of the disk 2 is inclined so as to be separated from the disk 2. Even if the head is not extruded, the angle theta3 of inclination of the disk 2 in the state of the disk 2 pressed by the member 3 can be reduced and deformation other than normal deformation of the disk 2 determined by the head and the ridgelines 3e of the member 3 can be suppressed. Consequently, a stable head output can be secured.

7. 发明专利

JPS62175973A TRACKING SERVO-MECHANISM IN MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS62175973A
公开(公告)日：1987-08-01
申请号：JP1593686
申请日：1986-01-29
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： KANO KIYOSHI , KANEKO HISAO , IWAKURA MASAO , ITO TETSUO , OGIJI KENJI
IPC分类号： G11B21/10 , G11B5/55 , G11B5/596
摘要： PURPOSE:To make the device follow up even a tracking error generated in one rotation of a disk, without making the whole device large in size and heavy in weight, by making it inexpensive and without executing an interference magnetically, by using a piezoelectric element as a driving source of a magnetic head, and forming a head carriage by a laminated body of the piezoelectric element. CONSTITUTION:A one step feed of a fine movement system is executed by varying stepwise a voltage applied to laminated type ceramics for forming a head carriage 5. After the one step feed, the second reproducing level detection is executed, and whether said level is larger or smaller than the first detection, namely, a reproducing level of one step before is compared. While the present reproducing level is larger, the one step feed in the same direction, and the comparison of the reproducing levels are continued, and when the present level is smaller or equal, the one step feed and the comparison of the reproducing levels are executed by inverting the moving direction. In such a way, a fine movement of a head in the radial direction of a disk can be executed, and without executing an interference magnetically, a magnetic head can follow up even against a tracking error portion which is generated in the course of one rotation of the disk.

8. 发明专利

JPS6289451A TACK COIL FOR ELECTRONIC STILL CAMERA 失效
公开(公告)号：JPS6289451A
公开(公告)日：1987-04-23
申请号：JP22671385
申请日：1985-10-14
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TAKEDA KATSUNOBU , UEHARA MASAHIRO , ITO TETSUO
IPC分类号： H02K7/20 , G11B19/20 , G11B19/28 , H02K29/00
摘要： PURPOSE:To obtain a large-scale output by the use of a small-sized tack coil by placing a metal fitting to pass the flux between an end of a tack coil core and a motor shaft to form a magnetic path. CONSTITUTION:On a motor cover 21 an absorption magnet 18 is provided, where a magnetic path is formed with an absorption yoke 17 and PG yoke 12 fixed to a hub 11 to which a magnetic sheet 7 is fitted, and is placed opposite to an iron core 23 of a tack coil 10. To the end face on the opposite side of the iron core 23 of the tack coil 10 a magnetic fitting 24 is installed to connect magnetically to a motor shaft 22, forming a closed magnetic path. Thus, as the magnetic resistance of the magnetic path including the tack coil core 23 is minimized, even a small-sized coil 10 can get a large-scale output.

9. 发明专利

JPH02130747A TAPE LOADING MECHANISM FOR MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH02130747A
公开(公告)日：1990-05-18
申请号：JP28368388
申请日：1988-11-11
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： TAKEDA HIDEKAZU , IWAKURA MASAO , NISHIDA IKUO , OOMORI HARUNORI , ITO TETSUO
IPC分类号： G11B15/665
摘要： PURPOSE:To make the title mechanism smaller in constitution and, at the same time, to stabilize the running of a tape by loosely coupling a tape transferring member with a tape drawing-out member and not applying the press-contacting force of the drawing-out member by means of a positioning member to the tape transferring member as a load. CONSTITUTION:When a tension pin 4 is moved in the direction shown by the arrow A by means of a cam, the loading ring 18a of a tape transferring member is simultaneously revolved in the direction shown by the arrow B and forms a drawing-out member together with a tape drawing-out member 8. Then a guide base 5 loosely coupled with the ring 18a through a coupling member 19 provided with a long hole is press- contacted and positioned by means of a press-contacting arm 33 after the base 5 is revolved and positioned by means of a positioning member 32 which is not coupled with the ring 18a. Therefore, the press-contacting force does not become the load to the ring 18a. Moreover, when the ring 18a revolves, the tape drawing-out member 8 is revolved and a tape 1 is loaded on a rotary drum 10 in a long-span state. With a small-size constitution which can make the load to the ring 18a and the ring driving force smaller, the tape span can be elongated and the running of the tape can be stabilized.

10. 发明专利

JPS62132102A POSITION DETECTOR 失效
公开(公告)号：JPS62132102A
公开(公告)日：1987-06-15
申请号：JP27152585
申请日：1985-12-04
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： IWAKURA MASAO , KANEKO HISAO , ITO TETSUO
IPC分类号： G01B7/00 , G01D5/245
摘要： PURPOSE:To achieve miniaturization and wt. reduction and to enable the detection of an absolute position, in at least a part of the magnetic field generating means on the same truck, by generating inverse magnetic fields at an interval different from that in the other part on said track. CONSTITUTION:A magnetic field generating pattern 2 is formed of a magnetizing pattern 201 wherein N-poles and S-poles are alternately arranged on the same track at an equal interval having a pitch length P and magnetizing patterns 211, 212 provided to both sides of said pattern 201 so that N-poles and S-poles having polarities respectively different from those at both terminals of the magnetizing pattern 201 are alternately arranged at an equal interval having a pitch length P/2. A magnetic sensor 1 is opposed to the pattern 2 and has at least four or more of magnetic resistance effect elements 31-34 arranged to the surface opposed to the pattern 2 at an equal interval having a pitch length P/4 in a predetermined displacement direction. When the sensor 1 and the pattern 2 are relatively displaced and the elements 31, 32 are opposed to the patterns 201, 211, the difference between the resistance values of the elements 31, 32 is respectively shifted by 90 deg., 180 deg.. By utilizing this difference, a predetermined position represented by a boundary position is detected.

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