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81. 发明专利

JPS62134839A OPTICAL MAGNETIC REPRODUCING DEVICE 失效
公开(公告)号：JPS62134839A
公开(公告)日：1987-06-17
申请号：JP27491385
申请日：1985-12-09
申请人： HITACHI LTD
发明人： KATASE YOSHIHIRO , OTSUKA YASUO , SASAKI TORU , FUKUI YUKIO
IPC分类号： G11B11/10 , G11B7/135 , G11B11/105
摘要： PURPOSE:To remove a noise component and to increase a reproduced output by rotating the polarized surface of reflected or transmitted light from an optical magnetic recording medium so as to branch into two parts and controlling the polarized surface in the direction where the low frequency component of a differential output obtained by photoelectrically transferring a detection output comes to zero. CONSTITUTION:An optical magnetic disk 2 with a magnetic film 2 is rotated by a motor 3, and light out of a linear polarization semiconductor laser 4 is irradiated on the magnetic film 2. The reflected light from the magnetic film 2 is led to a beam splitter 10 and a four-division photodetector 13, and makes incident on a polarization prism 16 through a 1/4 wavelength plate 14 and a convex lens 15 so as to branch into two parts. The branched light makes incident on photodetectors 17a and 17b, is converted into an electrical signal and inputted to a differential circuit 22. Its output is led to a terminal 23 as a reproduced signal output and to an LPF 24, and its low frequency component is detected. Then the rotating angle of the wavelength plate 14 is controlled in the direction where the low frequency component comes to zero. Thus the noise output included in the reproduced signal is removed in such a way, whereby the reproduced output can be increased.

82. 发明专利

JPS6247833A OPTICAL DISK DEVICE 失效
公开(公告)号：JPS6247833A
公开(公告)日：1987-03-02
申请号：JP18727685
申请日：1985-08-28
申请人： HITACHI LTD , HITACHI VIDEO ENG
发明人： SASAKI TORU , OTSUKA YASUO , SHINADA SATOSHI
IPC分类号： G11B7/125
摘要： PURPOSE:To attain a rewriting action by inserting a parallel flat glass plate so that the laser scattered light is transmitted twice and using a turning device so that the normal spectrum is set parallel or oblique to the optical axis. CONSTITUTION:The light S sent from a semiconductor laser 1 is made incident on a polarizing prism 3 and reflected by a reflecting mirror 5 after passing through a parallel flat glass plate 2 and a 1/4 wavelength plate 4. This reflected light S passes through the plate 2 again via the plate 4. Thus, the laser light S travels to and comes back from the plate 4 and is turned into the light P having its polarizing plane turned by 90 deg.. This light P is made incident on a collimator lens 6 and circularly polarized via a 1/4 wavelength plate 12 to be recorded at a recording part 10 of a disk 9. The reflected light sent from the disk 9 passes through the plate 12 with its polarizing plane turned by 90 deg. and turned into the light S. Then the light S is reflected by the prism 3 and made incident on a detector 8. The detector 8 performs the reproduction, etc. of the recording signal by the reflected light. Here the plate 2 functions to set the normal vector parallel to an optical axis A in a recording/reproduction mode to prevent the generation of astigmatism and also to set the normal vector oblique 2' to the axis A in an erasion mode to prevent the generation of astigmatism respectively.

83. 发明专利

JPS6212934A OPTICAL HEAD 失效
公开(公告)号：JPS6212934A
公开(公告)日：1987-01-21
申请号：JP15022985
申请日：1985-07-10
申请人： HITACHI LTD
发明人： INOUE MASAYUKI , KATASE YOSHIHIRO , ONISHI KUNIKAZU , OTSUKA YASUO , SASAKI TORU
IPC分类号： G11B7/125 , G11B7/135
摘要： PURPOSE:To obtain an optical head whose focusing servo and tracking servo do not disalign from each other by continuously varying the astigmatism of luminous flux made incident on an objective lens in switching between recording- reproduction mode and deletion mode. CONSTITUTION:To record a signal on a disc vapor-deposited a recording thin film, a laser beam modulated according to the recording signal is condensed to a small beam spot having about 1mum diameter and irradiated on a information recording plane 10a to satisfy the quick heating and cooling condition, and the signal is recorded. To reproduce the recorded signal, a continuous laser beam of about 1/10 of the output for recording is condensed to the beam spot likewise as in recording and irradiated on the plane 10a, and the quantity of reflected light beam is detected by adding the output signals of detectors 13 and 14. To delete the recorded signal, a continuous laser beam is condensed to a small elliptical beam spot having about 1mumX10mum diameter long in the advancing direction of the disc, and irradiated on the plane 10a to satisfy gradual heating and cooling condition, and the recorded signal is deleted.

84. 发明专利

JPS6212926A OPTICAL DISK 失效
公开(公告)号：JPS6212926A
公开(公告)日：1987-01-21
申请号：JP15022785
申请日：1985-07-10
申请人： HITACHI LTD
发明人： OTSUKA YASUO , SASAKI TORU , FUKUI YUKIO , INOUE MASAYUKI , ONISHI KUNIKAZU , KATASE YOSHIHIRO
IPC分类号： G11B7/00 , G11B7/0055 , G11B7/007 , G11B7/24 , G11B7/30
摘要： PURPOSE:To execute recording, reproducing and erasing precisely and to attain rapid rewriting operation by forming a gap between a header signal part and a data part or on the back of the data part and regulating the length of the gap on the basis of the length of respective spots for recording, reproducing and erasing. CONSTITUTION:At the time of erasing operation, an address signal recorded on the header part M is read out by a recording/reproducing spot 13 and a feed motor 9 is driven to move a pickup 6 to an objective sector on a track. Then, the header part M is reproduced, and when the current sector is recognized as the objective sector, the pickup 6 increases the output of a laser beam 7 and forms an elliptic erasing spot 14 to erase a data signal 12 recorded on the data part N. A section in which the reproducing spot 13 is changed to the erasing spot 14 is defined as a gap L, and when the reproducing, erasing or recording spot is formed by changing the output of one laser beam 7, the gap L is set up so as to exceed the longest spot out of three spots.

85. 发明专利

JP2004094222A Optical apparatus 审中-公开
公开(公告)号：JP2004094222A
公开(公告)日：2004-03-25
申请号：JP2003206636
申请日：2003-08-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： FUSE KENJI , SHIRAISHI MIKIO , OTSUKA YASUO , KAKU NOBUYUKI , IKEDA HIDEHIRO
IPC分类号： G02F1/13 , G03B21/00 , G03B21/16 , H04N5/74
摘要： PROBLEM TO BE SOLVED: To obtain an optical apparatus having a cooling device which is advantageous in size and thickness reduction.
SOLUTION: An air blow passage comprises a plurality of flow passages which are divided by guide members installed from nearby an air blowing means to nearby a light valve means. An air intake and an air outlet are arranged on the flank of the housing of the optical apparatus.
COPYRIGHT: (C)2004,JPO

86. 发明专利

JP2004070333A Optical unit and projection type display device 有权
标题翻译：光学单元和投影类型显示设备
公开(公告)号：JP2004070333A
公开(公告)日：2004-03-04
申请号：JP2003206640
申请日：2003-08-08
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： OUCHI SATOSHI , OTSUKA YASUO , TANITSU MASAHIKO
IPC分类号： G02F1/13 , G02B27/18 , G02F1/13357 , G03B21/00 , G03B21/14
摘要： PROBLEM TO BE SOLVED: To achieve size reduction, improved brightness, high picture quality, and increased accuracy in assembling components, with respect to a projection type image display device. SOLUTION: In first and the second array lens of the projection type image display device, the lens cell dimension is made nearly 1/4.5 or larger compared with the dimension of a liquid crystal display element, or the diagonal dimension of the lens cell is made nearly 0.18" or smaller. Otherwise, the total number of lens cells is made roughly 240 or more. In addition, in a polarizing beam splitter optical system, a light shielding member is installed in the second array lens. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：相对于投影型图像显示装置，实现尺寸减小，改善的亮度，高图像质量和组装部件的精度。
解决方案：在投影型图像显示装置的第一和第二阵列透镜中，与液晶显示元件的尺寸相比，透镜单元尺寸大致为1 / 4.5或更大，或者透镜的对角线尺寸单元制成近0.18“，否则镜片单元的总数大致为240个以上，另外，在偏光分束器光学系统中，在第二阵列透镜中安装有遮光构件。版权所有（C）2004，JPO

87. 发明专利

JP2001281562A ROTARY TYPE COLOR DISK AND VIDEO DISPLAY DEVICE USING THE SAME 失效
公开(公告)号：JP2001281562A
公开(公告)日：2001-10-10
申请号：JP2000097867
申请日：2000-03-30
申请人： HITACHI LTD , NIPPON SHINKU KAGAKU KENKYUSHO
发明人： MASUOKA NOBUO , OTSUKA YASUO , KISHI YUJI , NOMOTO HIROSHI
IPC分类号： G02B26/00 , G02B5/20 , G03B21/00 , H04N9/31
摘要： PROBLEM TO BE SOLVED: To provide a rotary type color disk with few irregular rotation in which a wind whistle is suppressed with a simple configuration, and to provide a video display device using the same. SOLUTION: A light transmission substrate on which a light transmission region 8 of a color separation filters 5 of a plurality of colors is fixed, is attached to a motor rotation-drivably.

88. 发明专利

JP2000036172A DISK CARTRIDGE 失效
公开(公告)号：JP2000036172A
公开(公告)日：2000-02-02
申请号：JP20421699
申请日：1999-07-19
申请人： HITACHI LTD
发明人： KANO KIYOSHI , OTSUKA YASUO , SHIRAISHI MIKIO , TAKEUCHI TOSHIFUMI , NAKAMURA MASAFUMI , INOUE MASAYUKI , SUZUKI YOSHIO , MIURA MICHIO
IPC分类号： G11B23/03
摘要： PROBLEM TO BE SOLVED: To greatly increase the capacity of a CD system or the disk system having an approximately same size of the CD system by making the shutter of a disk cartridge to cope with both surfaces of a disk and to slide in both directions and providing a means at the position, where windows are closed, to press the shutter. SOLUTION: Windows 2a and 3a are formed in a portion of a disk surface to expose for recording and reproducing information. A shutter 4 consists of integrally formed shutter surfaces 4a and 4b corresponding to the both surface of a disk with a side surface section 4cwhich is integrally connected to the surfaces 4a and 4b. Its projecting sections 4p and 4q are engaged with guide grooves 2g, which are linearly formed on a case, to linearly slide in the left and the right direction. Two springs 40 and 41 press the surfaces 4a and 4b to stay at the position that the windows 2a and 3a are closed. The two springs have a same shape and are mounted respectively to two corner regions 50 and 51 which sandwitch the shutter 4 from the left and right sides between two cases 2 and 3.

89. 发明专利

JP2000036170A DISK CARTRIDGE 失效
公开(公告)号：JP2000036170A
公开(公告)日：2000-02-02
申请号：JP20131399
申请日：1999-07-15
申请人： HITACHI LTD
发明人： KANO KIYOSHI , OTSUKA YASUO , SHIRAISHI MIKIO , TAKEUCHI TOSHIFUMI , NAKAMURA MASAFUMI , INOUE MASAYUKI , SUZUKI YOSHIO , MIURA MICHIO
IPC分类号： G11B23/03 , G11B23/28
摘要： PROBLEM TO BE SOLVED: To enable the discrimination of disk cartridges for different disks of approximately the same diameter by forming first cutback parts on only the one side of two ends in a sliding direction of a first shutter on a first orthogonal surface along which the first shutter slides. SOLUTION: Cases 2 and 3 are provided with the cutback parts 20a, 20b so as to exist point symmetrically at the orthogonal surfaces on the front edge side in the insertion direction thereof. Projecting parts 210a are fitted corresponding thereto. These cutback parts 20 are merely necessitated to be point symmetrical and if the disk is one side recording, only the one side corresponding to the recording surface of these cutback parts 20a, 20b is formed, by which the discrimination from both side recording and further the assignment as to the surface of which side is the recording surface are made possible. The combinations of the cutback parts and the projecting parts may be replaced with all detecting means if the arrangement relations thereof are so constituted as to be made point symmetrical at the orthogonal surfaces on the front edge side.

90. 发明专利

JPH11183885A LIQUID CRYSTAL DISPLAY DEVICE 失效
公开(公告)号：JPH11183885A
公开(公告)日：1999-07-09
申请号：JP26174898
申请日：1998-09-16
申请人： HITACHI LTD
发明人： OTSUKA YASUO , SHIRAISHI MIKIO , NUMATA TORU , HIRATA KOJI , OGURA NAOYUKI , INAOKA SHIGERU , NAKAGAWA KAZUNARI , MORI SHIGERU , TANITSU MASAHIKO
IPC分类号： G02F1/13 , G02F1/1333 , G03B21/16
摘要： PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of attaining the improvement of luminance of a projected image and the suppression of temperature rise of a liquid crystal(LC) display element and polarizing elements and formed by compact and simple constitution. SOLUTION: The CR display device is provided with an LC display element 2 for converting light from a light source into an optical signal expressing an image corresponding to a drive signal, a projecting optical system for projecting the optical signal to a target to be projected, an exit side polarizing element 3b, a holding member 6 for fixing and holding respective elements together with the element 2, a cooling medium 5 for cooling, an incident side polarizing element 3a, and a 1st optical element 1a constituting the projecting optical system. Either one of the elements 3a, 2, the element 1a and the member 6 constitute space between the elements 2, 1a. The space is filled with the cooling medium 5.

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