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1. 发明专利

DE3604722A1 未知
公开(公告)号：DE3604722A1
公开(公告)日：1986-09-11
申请号：DE3604722
申请日：1986-02-14
申请人： HITACHI LTD
发明人： NAKAMURA SHIGERU , KAMISADA TOSHIMASA , SAITO AKIRA , MAEDA TAKESHI , TSUNODA YOSHITO , KAKU TOSHIMITSU , KATO TUYOSHI , HISHIKI MASAAKI , WATANABE MASATERU
IPC分类号： G11B7/09 , G11B11/105 , G02B7/11 , G11B7/135
摘要： A focus error detection apparatus and an optical disk apparatus comprising a focusing lens for focusing reflected light coming from a light reflecting surface which is to be adjusted at the focal point of a projected light beam; a beam splitter means for dividing the output light of said focusing lens into a first and a second focused light beam; a first and a second photo-detector disposed respectively on the optical paths of said first and said second focused light beam, one of which is located behind the convergence point of said first focused light beam and the other of which is located before the convergence point of said second focused light beam, each of them generating outputs proportional to the amount of light within a predetermined region of the received light image, when it varies so that it is enlarged; and a circuit generating a focus error signal by using the difference between the outputs of said two photo-detectors.

2. 发明专利

JPS61224144A FOCUS ERROR DETECTOR 失效
公开(公告)号：JPS61224144A
公开(公告)日：1986-10-04
申请号：JP6357885
申请日：1985-03-29
申请人： HITACHI LTD
发明人： KAMISADA TOSHIMASA , HISHIKI MASAAKI , SAITO AKIRA , WATANABE MASATERU
IPC分类号： G02B7/28 , G11B7/09
摘要： PURPOSE:To obtain a focus error detection signal with less effect by a change in a reflected light due to the shape change in the reflected plane by arranging each photodetector on each optical path in a positional relation where the size change in the focus photodetection image appears oppositely each other attended with out of focus. CONSTITUTION:The reflected light 2 focused by a condenser lens 3 is divided into two by a beam splitter 10 and a straight light 2A and a branched light 2B form focal points P1, P2 at an equal position from a branched face 10' respectively. In this case, two photodetectors 13, 14 are used, one photodetector 13 is arranged to a position near the beam splitter by a prescribed distance (w) from the focal point P2 and the other photodetector is arranged at a position parted from the focal point P1 by a distance (w) and the beam splitter output light is received at a respective position. Thus, the differential output V of the photodetectors 13 and 14 shows an S-shaped characteristic curve to the deviation delta of focal point to constitute an automatic focus servo system.

3. 发明专利

JPS61199246A DETECTION SYSTEM FOR FOCUS POSITION 失效
公开(公告)号：JPS61199246A
公开(公告)日：1986-09-03
申请号：JP3873985
申请日：1985-03-01
申请人： HITACHI LTD
发明人： KAMISADA TOSHIMASA , HISHIKI MASAAKI , SAITO AKIRA , WATANABE MASATERU
IPC分类号： G02B7/28 , G11B7/09
摘要： PURPOSE:To reduce the occurrence of focus detection error with respect to the deviation of the direction or the position of an optical beam by arranging shielding elements before and after the converging point of a reflected light and forming an approximately rectangular optical pattern on a photodetector. CONSTITUTION:The first and the second shielding elements 10 and 11 are arranged before and after a converging point P1 of an optical beam 2, and an approximately rectangular optical pattern 12 is formed on light receiving surfaces of photodetectors 5a and 5b. In this constitution, boundary lines 13 and 14 of photodetectors 5a and 5b are moved in the vertical direction according as the inclination of a lens 3 is varied. In this case, positional relations among the converging point P1 and shielding elements 10 and 11 are selected properly to equalize extents of movement of boundary lines 13 and 14 on photodetectors. Thus, a device is obtained where the focus position detection error is difficult to occur with respect to the deviation of the direction or the position of the optical beam.

4. 发明专利

JPH0836762A OPTICAL DISK APPARATUS 失效
公开(公告)号：JPH0836762A
公开(公告)日：1996-02-06
申请号：JP5849895
申请日：1995-03-17
申请人： HITACHI LTD
发明人： KAMISADA TOSHIMASA , HISHIKI MASAAKI , SAITO AKIRA , WATANABE MASATERU
IPC分类号： G02B7/28 , G11B7/09
摘要： PURPOSE:To obtain an optical disk apparatus having a focus error detector in which the change of a reflected light quantity or an optical axis due to the state of an optical disk recording surface scarcely influences a focus error signal. CONSTITUTION:The optical disk apparatus comprises an optical system 21 for casting a laser beam at a rotating recording medium 22, a beam splitter 25 for separating the reflected light beam from the medium into first and second convergent light beams, first and second photodetectors 13, 14 disposed on the optical paths of the first and secod light beams, and a circuit for generating a focus error signal corresponding to the difference of the outputs of the photodetectors. The photodetectors are disposed on the paths in the positional relationship in which the amplitude changes of light receiving images due to the lights upon the deviation of the focuses occurs in reverse directions to form focus error signals from the outputs of second and third areas 16a-16d to obtain a tracking control signal for allowing the positions which is irradiated with the laser beam, from the output of the spit areas 16e-16h to follow up the track of the medium.

5. 发明专利

JPS63193353A MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63193353A
公开(公告)日：1988-08-10
申请号：JP2481387
申请日：1987-02-06
申请人： HITACHI LTD
发明人： HISHIKI MASAAKI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To permit simultaneous execution of information erasing of magneto-optical recording films on both sides of a both-face type magneto-optical recording medium by freshly providing a magnetic material layer between two sheets of the magneto- optical recording films. CONSTITUTION:The magneto-optical recording films 2 are formed on the respective one face of two sheets of transparent substrates 1 and the magnetic material layer 4 is provided between two sheets of the magneto-optical recording films 2. The respective magneto-optical recording films 2 are adhered to the magnetic material layer 4 via adhesive layers 3. The pole opposite from a magnetic pole 5 is generated on the surface of the magnetic material layer 4 provided between two sheets of the magneto-optical recording films 4 when said magnetic material layer is placed in magnetism and, therefore, magnetic lines 6 of force arrive in the converged state from the magnetic pole 5 at the magnetic material layer 4. Since the magnetic field is perpendicular to the magneto-optical recording films 2 at this time, the magnetization directions of the magneto-optical recording films can be unified. Simultaneous execution of such operation with two sheets of the magneto-optical recording films 2 is thereby executed. Execution of the simultaneous erasing of the information on the magneto- optical recording films 2 no both sides of both-face type magneto-optical recording medium is thus permitted.

6. 发明专利

JPH0380438A OBJECTIVE LENS DRIVER 失效
公开(公告)号：JPH0380438A
公开(公告)日：1991-04-05
申请号：JP21481089
申请日：1989-08-23
申请人： HITACHI LTD
发明人： HISHIKI MASAAKI
IPC分类号： G11B7/09
摘要： PURPOSE:To prevent the invasion of dust into an optical head and to maintain the initial optical characteristics for a long time by dividing an objective lens into a fixed part close to a recording medium and a movable part separated far from the recording medium and capable of moving along the optical parth. CONSTITUTION:An incident optical beam 12 from the lower part is passed through a movable objective lens 4 and a fixed objective lens 3 and forms its focus on an optical disk 13. A coil 6 opposed to a magnet 7 and a yoke 8 is wound around a bobbin 5 fixed on the lens 4, and when current is allowed to flow into the coil 6, the objective lens moving part supported by a spring 9 is moved in the optical axis direction, so that the focus position of the optical beam 12 can be controlled. Thereby, the periphery of the lens 13 can be sealed by fixing the lens 13 to the cover 2, so that the invasion of dust from the outside can be prevented. New parts for focusing are not required and the drop of high resonance frequency due to the deterioration in the frequency characteristics of the driver can be prevented.

7. 发明专利

JPS6150247A Automatic tape guiding device 失效
标题翻译：自动胶带导向装置
公开(公告)号：JPS6150247A
公开(公告)日：1986-03-12
申请号：JP17036084
申请日：1984-08-17
申请人： Hitachi Ltd
发明人： HISHIKI MASAAKI , SAITO AKIRA
IPC分类号： G11B15/67
摘要： PURPOSE: To make a cartridge simple and compact and to preclude the fear of loss of exchangeability by extracting automatically a tip of a magnetic tape from the cartridge without mounting a reader block and winding the tape automatically on a winding reel.
CONSTITUTION: Air is blown to an air duct 13 of cartridge 1 from a nozzle 3, a tape tip 11a is drawn up to a tentative fastening device 4 from the cartridge 1, the excitation of a solenoid 64 is released and the tape is held by a fixing plate 61 and a moving plate 62 of a holding device 6. When a belt 5 is forwardly by the drive of a pulley 52, the tape tip 11a is connected to a hub 21 of a winding reel 2 via a tape running path A and carried to a lead part 23. A solenoid 72 of a release device 7 is excited to open the moving plate 62, then the tape tip 11a is released from the holding of the holding device 6, the winding reel 2 adsorbs the tape tip 11a to the hub 21 and turns tentatively, then the tape tip 11a is wound neatly on the peripheral of the hub 21.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了使墨盒简单紧凑，并且通过自动从墨盒中提取磁带尖端而避免安装读卡器，并将磁带自动卷绕在卷绕卷轴上，以防止丢失可交换性。构成：从喷嘴3将空气吹向墨盒1的风路13，将磁带末端11a从盒1拉出到暂时的紧固装置4，螺线管64的激励被释放，磁带被保持固定板61和保持装置6的移动板62.当带5通过带轮52的驱动向前方时，带末端11a经由带运行路径A连接到卷绕卷轴2的轮毂21 并被运送到引导部分23.释放装置7的螺线管72被激励以打开移动板62，然后带头11a从保持装置6的保持力释放，卷绕卷轴2吸附带末端11a 到轮毂21并暂时转动，然后带尖11a整齐地缠绕在轮毂21的周边上。

8. 发明专利

JPH01248336A OPTICAL DISK 失效
公开(公告)号：JPH01248336A
公开(公告)日：1989-10-03
申请号：JP7429588
申请日：1988-03-30
申请人： HITACHI LTD
发明人： HISHIKI MASAAKI
IPC分类号： G11B7/24
摘要： PURPOSE:To prevent a substrate on a recording film from being impaired by forming the thickness of the substrate at an inner peripheral part and an outer peripheral part where no recording film is formed thicker than other part. CONSTITUTION:An optical disk is constituted by forming the recording film 2 on the substrate 1 through which light transmits and sticking a pair of substrates 1 on which the recording films 2 are formed by sandwiching an outer peripheral spacer 3 and an inner peripheral spacer 4 so as to confront the recording films 2 with each other at the inner side. And the thickness of the substrate 1 at the outer peripheral part 1a and the inner peripheral part 1b where no recording film 2 is formed is increased, which exceeds the height of a part 1c where the recording film 2 is formed, and the part 1c where the recording film 2 is formed forms the recessed part of a flat plane. Therefore, the thick parts 1a and 1b of the substrate 1 are brought into contact with an external object. In such a way, it is possible to prevent the substrate on the recording film from being impaired.

9. 发明专利

JPS6371962A INFORMATION ERASER FOR MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS6371962A
公开(公告)日：1988-04-01
申请号：JP21570586
申请日：1986-09-16
申请人： HITACHI LTD
发明人： HAYASHI KOJIRO , MIYAZAKI MICHIO , DOI TAKASHI , HISHIKI MASAAKI
IPC分类号： G11B11/10 , G11B11/105 , G11B19/04
摘要： PURPOSE:To prevent required information from being erroneously erased by providing a means for detecting the state of a writing prohibiting and displaying part in an information eraser and erasing the information after both the surfaces of a magneto-optical recording medium can be written. CONSTITUTION:In a cartridge 2 in which the magneto-optical recording medium 3 having both the surface capable of being recorded is stored, the two writing prohibiting and displaying parts 6 for displaying the propriety for writing consisting of respective one on a recording surface are provided. When the cartridge 2 for storing the magneto-optical medium 3 is inserted into the information eraser, the state of the writing prohibiting and displaying part 6 is detected by the detector 1 before an information erasing operation is started. For instance, the presence and the absence of a reflection mirror is detected by the presence and the absence of a reflected light and the state of the writing prohibiting and displaying part 6 is detected. Then, from the result obtained by the detector 1, the magneto-optical recording medium 3 stored in the cartridge 2 erases the recorded information only when it is recognized that both surfaces may be erased.

10. 发明专利

JPS62125548A OPTICAL HEAD 失效
公开(公告)号：JPS62125548A
公开(公告)日：1987-06-06
申请号：JP26474585
申请日：1985-11-27
申请人： HITACHI LTD
发明人： HISHIKI MASAAKI
IPC分类号： G11B7/125
摘要： PURPOSE:To perform the accurate control of light emission by using a polarizer to alloy the laser light into a polarized beam splitter and to transmit only the polarized beam that is parallel with the incident plane among those laser beams which are radiated from the beam splitter and does not read a recording medium. CONSTITUTION:The laser light radiated from a laser diode 101 is made incident on a polarized beam splitter 204 via a coupling lens 102 and a triangular prism 103. The splitter 204 separates the laser light reaching a recording medium 106 from the light that does not reach the medium 106. While the light transmitted through the splitter 204 is made incident on the medium 106 via a stop-down lens 105. While the light reflected by the medium 106 is reflected again by the splitter 204 via the lens 105 and made incident on a signal processing system 111. Only the deflected light that is parallel with the incident surface is transmitted through a polarizer 207 among those beams which do not reach the medium 106. Then said transmitted light is received by a photodetector 109 through a stop-down lens 108. The output of the photodetector 109 controls the diode 101 via an optical output controller 110. In such a way, the correct control is possible with emission of light.

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