专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明专利

JPH05244363A 失效
公开(公告)号：JPH05244363A
公开(公告)日：1993-09-21
申请号：JP4094692
申请日：1992-02-27
申请人： HITACHI LTD
发明人： KOJIMA YASUYUKI , NAKAMURA KOZO , KUZUNUKI SOSHIRO , YOKOTA TAKAYOSHI , YOKOSUKA YASUSHI , NAKAJIMA KEISUKE , NAKAMURA TOSHIAKI , TAKEI TORU , TAKAOKA KAZUHIKO , OKABE SHUICHI , SUZUKI YASUAKI , HORI YASURO , HONDA TATSUO , KONNO KAZUTOSHI , OTSUKA YASUO
IPC分类号： H04N1/04
摘要： PURPOSE:To realize a reading scanning and a recording scanning with high quality by delaying the movement start of a main scanning in accordance with acceleration speed in a sub scanning direction in a state where a main scanning device and paper are relatively moving. CONSTITUTION:When a motor is driven by a sub-scanning pulse, the actual quality by delaying the movement start of a main scanning in accordance by receiving the influence of a mechanical inertia. When two scanning lines are driven in short time Tsi after long time Tsi-1 so that there us time Tsi+1 till the succeeding scanning, the timing of the main scanning l is delayed as against the timing of the sub-scanning. Delay quantity Td1 is decided by calculating the acceleration speed of the sub-scanning from time Tsi-1 and time Tsi. That is, delay quantity at the time of max. speed is decided, delay quantity is increased when acceleration is executed as against it and delay quantity is decreased when deceleration is executed. Here, delay quantity means necessary and sufficient time from time when a transmission command in the sub-scanning direction is given till time when movement is actually started in the sub-scanning direction.

52. 发明专利

JPH03225627A SEPARATION TYPE OPTICAL HEAD 失效
公开(公告)号：JPH03225627A
公开(公告)日：1991-10-04
申请号：JP1902290
申请日：1990-01-31
申请人： HITACHI LTD
发明人： MIURA MICHIO , SASAKI TORU , KISHI YUJI , OTSUKA YASUO
IPC分类号： G11B7/08 , G11B7/085
摘要： PURPOSE:To ensure the adjustment of the optical axis misalignment of a station ary optical system and a movable optical system with simple constitution by turnably constituting a holding member around a guide shaft and providing a means for adjusting the turning position of the holding member. CONSTITUTION:The holding member 20 imposed with the stationary optical system 26 is turned around the guide shaft 7 by screwing and unscrewing an adjusting screw 27 of the adjusting means. The optical axis of the laser beam emitted from the optical system 26 is moved in nearly the same direction as the optical axis direction z of an objective lens 2. The optical axis misalignment in the z direction of the movable optical system 14 and the stationary optical system 26 is, therefore, corrected. An actuator 3 which supports and drives the lens 2 is constituted movable in the direction y perpendicular to the z direc tion of the lens 2 and the traversing direction x of information tracks on a carriage 1. The optical axis of the optical system 14 can, therefore, be moved in the y direction and the optical axis misalignment in the y direction of the optical systems 14 and 26 is corrected.

53. 发明专利

JPH03119553A CASE LOADING AND EJECTING MECHANISM 失效
公开(公告)号：JPH03119553A
公开(公告)日：1991-05-21
申请号：JP25520789
申请日：1989-10-02
申请人： HITACHI LTD
发明人： KISHI YUJI , OTSUKA YASUO , MIURA MICHIO
IPC分类号： G11B17/04 , G11B17/043
摘要： PURPOSE:To reduce the number of parts and to simplify the constitution by not only sensing insertion of a case at the time of loading but also pushing out the case at the time of ejection by a trigger lever. CONSTITUTION:When a case 1 is inserted to a case holder 3 in the direction of an arrow A, a trigger lever 4 is not turned in the initial stage, but it is turned when being pushed by the case 1. Then, a load slider contact part 4c of the lever 4 is disengaged from a trigger lever contact part 6d of a load slider 6, and the slider 6 is moved in the direction of an arrow B by the energizing force of a spring 13. The case 1 and a magnetic head 5 are lowered and loaded. At this time, the contact part 4c is brought into contact with a trigger lever holding part 6e of the slider 6 and is controlled, and the lever 4 is not brought into contact with the case 1. When an eject button 6f of the slider 6 is depressed, the reverse operation is performed, and the holder 3 pushes out the case 1 in the direction of the arrow B. Thus, the case 1 is inserted or ejected by forward or reverse operation, and the number of parts is reduced to simplify the constitution.

54. 发明专利

JPH0395760A SHUTTER OPENING / CLOSING MECHANISM 失效
公开(公告)号：JPH0395760A
公开(公告)日：1991-04-22
申请号：JP23160189
申请日：1989-09-08
申请人： HITACHI LTD
发明人： KISHI YUJI , MIURA MICHIO , SASAKI TORU , OTSUKA YASUO
IPC分类号： G11B17/04 , G11B17/043
摘要： PURPOSE:To open / close a shutter with a long stroke by regulating the track of an engage part to be engaged with the shutter of a shutter opening / closing mechanism by a guide groove. CONSTITUTION:When a case 1 is inserted, the case 1 is abutted to an engage part 12 and a shutter 3 is engaged with the engage part 12. When the case 1 is inserted further, an elastic body 13 is deformed and the shutter engage part 12 is moved along a guide groove 16 in a direction to open the shutter. Then, the shutter is opened and turned to a full open state. For ejecting the case 1, when the elastic body 13 is restored to an original shape by the restoring force of the elastic body 13, the engage part 12 is moved along the guide groove 16 in a direction reverse to the direction at the time of case insertion and pushes the case 1 to eject it. Thus, by using the guide groove 16, the operation of the engage part is stably regulated. Thus, the degree of freedom can be enlarged for designing the track of the engage part 12 and correspondence can be made even to the shutter with the large stroke as well.

55. 发明专利

JPH02254640A OPTICAL INFORMATION REPRODUCING DEVICE 失效
公开(公告)号：JPH02254640A
公开(公告)日：1990-10-15
申请号：JP7510989
申请日：1989-03-29
申请人： HITACHI LTD
发明人： KATASE YOSHIHIRO , ONISHI KUNIKAZU , IMADA RITSUO , SASAKI TORU , INOUE MASAYUKI , OTSUKA YASUO , KISHI YUJI , MIURA MICHIO , FUKUI YUKIO
IPC分类号： G11B11/10 , G11B7/13 , G11B11/105
摘要： PURPOSE:To receive all the transmitted light which moves with the movement of an optical head by means of a photodetector though the photodetector is integrally attached to an optical head or the head is made to move independently by making the length of the photodetector long enough to cover all the moving range of the transmitted light. CONSTITUTION:A polarizing plate 101, the photodetector 102 and a bias magnetic field impressing means 103 which are long enough to cover the access range of an objective lens 3 are disposed along the radial direction of an optical disk at a position opposed to the objective lens 3 by interposing the optical disk 20. The photodetector 102 is constituted of plural light receiving areas which are arrayed so that they coincide with an accessing direction and detect light independently. The respective light receiving areas have the minimum size where incident light 53 is received and only one to two light receiving areas receive the light at the time of accessing the objective lens 3. Though the photodetector is not integrally attached to the optical head or the optical head is not made to move independently, all the moving transmitted light is received by the photodetector and a movable part is prevented from being complicated.

56. 发明专利

JPH02198059A SHUTTER OPENING/CLOSING MECHANISM IN DISK DEVICE, MISLOADING PREVENTING MECHANISM AND LOADING MECHANISM 失效
公开(公告)号：JPH02198059A
公开(公告)日：1990-08-06
申请号：JP1610389
申请日：1989-01-27
申请人： HITACHI LTD
发明人： KISHI YUJI , MIURA MICHIO , OTSUKA YASUO
IPC分类号： G11B17/04 , G11B17/043
摘要： PURPOSE:To expand a shutter moving range by using an engagement pin guided by a guide slot provided to a cartridge holder for opening/closing a shutter. CONSTITUTION:With a cartridge 1 loaded to a cartridge holder 31, a loaded tip end face of the cartridge 1 and an engagement pin 38 are abutted with each other, the engagement pin 38 is guided by a guide slot 39 provided to the cartridge holder 31 and moved and engaged with a shutter 9 at a recessed part 10 of the cartridge 1. Moreover, as the cartridge 1 is being loaded, the engagement pin 38 is abutted against the recessed part 10 and moved along the guide slot 39 while being engaged with the shutter 9, then the shutter 9 is opened and when the engagement pin 38 reaches a parallel slot 41 of the guide slot 39 and moves in the parallel slot 41, the shutter 9 is fully opened. Through the constitution above, since the locus of the engagement pin 38 moving along the guide slot 39 is kept long, the mechanism is applied to the shutter 9 whose moving range is large thereby expanding the scope of the applications.

57. 发明专利

JPH02187935A OPTICAL HEAD, AND BEAM SPLITTER AND PRISM USED THEREFOR 失效
公开(公告)号：JPH02187935A
公开(公告)日：1990-07-24
申请号：JP496389
申请日：1989-01-13
申请人： HITACHI LTD
发明人： KATASE YOSHIHIRO , OTSUKA YASUO , SASAKI TORU
IPC分类号： G02B5/04 , G11B7/135
摘要： PURPOSE:To execute beam shaping without increasing the number of parts by making the refractive indexes of two pieces of prisms of a beam splitter different from each other, and also, selecting the relative angles of the incident surface and the boundary surface against the emitting surface so as to satisfy a prescribed condition. CONSTITUTION:Refractive indexes NL, NH of two pieces of prisms for forming a beam splitter 15 used together with an optical head are made different from each other and allowed to satisfy the condition of an expression I, and also, relative angles alpha, beta of the incident surface 5b and the boundary surface 5c against the emitting surface 5e are selected so as to satisfy the condition of the expression I. As a result, a light beam C which passes through a splitter 5 is shaped due to the difference of the refractive indexes NL, NH and by a constitution in which the number of parts is small, the anisotropy of a semiconductor laser beam is corrected, and also, the optical axis directions of incident and outgoing light beams (a), (c) become parallel.

58. 发明专利

JPH0276143A MAGNETO-OPTICAL REPRODUCING DEVICE 失效
公开(公告)号：JPH0276143A
公开(公告)日：1990-03-15
申请号：JP22664388
申请日：1988-09-12
申请人： HITACHI LTD
发明人： SASAKI TORU , OTSUKA YASUO , KATASE YOSHIHIRO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To make the polarized light beams of all the partial luminous fluxes into linear polarized light beams and to improve a C/N by correcting the turbulence of the polarized light beams to occur when laser beams are converged on a disk substrate having optical anisotropy. CONSTITUTION:The title device is equipped with a transparent substrate 3, for example, a LiNbO3 substrate, to change the shape of its index ellipsoid to indicate the optical anisotropy of the medium when an electric field is impressed to it, and further, a phase difference correcting means 9 composed by providing an electrode so that the electric field can be impressed to the surface of the substrate and the side surface of the substrate is provided in convergent light composed of light beams from a laser beam 5 to be made incident to an optical information recording medium 2. Further, the device guides reflected light beams from the optical information recoding medium 2 to light detectors 19a and 19b, controls the phase difference correcting means 9 using a control means so that phase difference to be generated in the phase difference correcting means 9 and phase difference to be generated in the optical information recording medium 2 can be offset with each other, and corrects the turbulence of the polarized light beams in the luminous flux. Thus, the fluctuation of DC light quantity and the decrease of AC light quantity can be prevented, and the C/N can be improved.

59. 发明专利

JPH01102746A OPTICAL DISK RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01102746A
公开(公告)日：1989-04-20
申请号：JP25968687
申请日：1987-10-16
申请人： HITACHI LTD
发明人： KATASE YOSHIHIRO , OTSUKA YASUO , SASAKI TORU , SAITO TADASHI
IPC分类号： G11B7/085 , G11B7/09
摘要： PURPOSE:To pull in an objective lens to the center of a light beam by applying such control that a spot is controlled so that it can always be projected on an information track when no coarse feeding of an optical head is performed, and the objective lens is controlled so that it can always be positioned in the center of the light beam when the coarse feeding of the optical head is performed. CONSTITUTION:A tracking error signal 19 obtained by supplying the sum signal of output from two photoreceiving areas 10a and 10b to a tracking error signal generation circuit 18 and the position signal 25 of the objective lens 5 obtained from the differential signal 23 of the output from those photoreceiving areas 10a and 10b are switched by a changeover switch 21. When no coarse feeding of the optical head 38 is performed, it is controlled in such a way that the spot can always be projected on the information track 8 by supplying the tracking error signal 19 to an objective lens driving means 36. Also, when the coarse feeding of the optical head 38 is performed, it is controlled so that the objective lens 5 can always be positioned in the center of the light beam by supplying the position signal 25 to the objective lens driving means 36. In such a way, it is possible to pull in the objective lens to the center of the light beam.

60. 发明专利

JPS6462847A MAGNETO-OPTICAL HEAD 失效
公开(公告)号：JPS6462847A
公开(公告)日：1989-03-09
申请号：JP21782987
申请日：1987-09-02
申请人： HITACHI LTD
发明人： SASAKI TORU , KATASE YOSHIHIRO , OTSUKA YASUO
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To miniaturize a magnetic optical head by forming a polarization beam splitter with a transparent flat plate to sandwich a polarization film and a transparent flat plate having all reflecting films and arranging this in the convergence light. CONSTITUTION:A polarizating beam splitter 16 is formed by a parallel transparent flat plate 16c to transmit a P polarization, sandwich a polarization film 16a to reflect an S polarization and coat a parallel transparent flat plate 16b and a total reflecting film 16d. A convergence light flux 14 is made incident from the upper side of the parallel transparent flat plate 16b onto the polarization film 16a. A P polarization 14a to transmit the polarization film 16a is total-reflected by a total reflecting film 16d of the parallel transparent flat plate 16c, transmits the polarization film 16a again and proceeds toward the right side of the parallel transparent flat plate 16b. On the other hand, an S polarization 14b reflected by the polarization film 16a also proceeds in the same direction as the P polarization 14a and is made incident on a light detector 17. Thus, the distance from the polarization beam splitter 16 to the light detector 17 can be shortened and a head can be miniaturized.

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