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21. 发明专利

JPH09311293A SPATIAL OPTICAL MODULATOR AND STEREOSCOPIC DISPLAY DEVICE FORMED BY USING THE SAME 失效
公开(公告)号：JPH09311293A
公开(公告)日：1997-12-02
申请号：JP12957996
申请日：1996-05-24
申请人： HITACHI LTD
发明人： KONOUE AKIHIKO , ARIMOTO AKIRA , TSUJI KAZUTAKA , KANEKO YOSHIYUKI , TATENO KIMIO , KOMODA MIGAKU , SHIMANO TAKESHI
IPC分类号： G02F1/13 , G02B27/22 , G03H1/22
摘要： PROBLEM TO BE SOLVED: To provide a spatial optical modulator which is equivalently diminished in the pitches of cells by using a presently available matrix type spatial optical modulators and a stereoscopic display device formed by using the same. SOLUTION: This spatial optical modulator is constituted by arranging >=2 sheets of the matrix type spatial optical modulators 100 to 110 having the same cell pitches in a manner as to attain the state of successively shifting these modulators in such a manner that the rays past the first sheet of the matrix type spatial optical modulator pass successively to the last matrix type spatial optical modulator and to attain the state in which the cells of the matrix type spatial optical modulators corresponding to the optical paths of the passing rays are shifted by 1/N the cell pitches between the adjacent matrix type spatial optical modulators. As a result, larger stereoscopic images are obtainable at the time of holography display.

22. 发明专利

JPH09230286A PARALLAX BARRIER STEREOSCOPIC DISPLAY SYSTEM 失效
公开(公告)号：JPH09230286A
公开(公告)日：1997-09-05
申请号：JP3603196
申请日：1996-02-23
申请人： HITACHI LTD
发明人： KONOUE AKIHIKO , ARIMOTO AKIRA , TSUJI KAZUTAKA , KANEKO YOSHIYUKI , TATENO KIMIO , KOMODA MIGAKU , SHIMANO TAKESHI
IPC分类号： G02B27/22
摘要： PROBLEM TO BE SOLVED: To enable an observer to view normal stereoscopic images in any postures by detecting the positions of both eyes of the observer and rotationally controlling barrier gratings in such a manner that the barrier gratings are held always perpendicular to a line connecting both eyes. SOLUTION: A display device 100 is composed of a display section 140, a parallax barrier section 130 and an image processing section. The barrier section 130 is made rotationally controllable by a dynamic mechanism and the method for controlling the rotation thereof is executed by subjecting the visual line direction vector of the observer 150 to image processing computation by an IR generator 110 disposed in the upper part of the display device 100 and an IR, camera 120. The direction of the parallax barrier is rotationally controlled in such a manner that this direction is held always perpendicular to the segment direction (visual line direction vector) of both eyes of the observer 150 at this point. The stripe direction of the displayed image and the parallax direction of both eyes are controlled in compliance therewith, by which the observer is enable to observe always the normal stereoscopic images in any postures.

23. 发明专利

JPH07176072A OPTICAL HEAD DEVICE 失效
公开(公告)号：JPH07176072A
公开(公告)日：1995-07-14
申请号：JP31931993
申请日：1993-12-20
申请人： HITACHI LTD
发明人： TATENO KIMIO , SHIMANO TAKESHI , FUKUDA HIROSHI , KOMODA MIGAKU
IPC分类号： G11B7/135 , G11B7/125 , G11B7/1367 , G11B7/1372 , G11B7/1392
摘要： PURPOSE:To enlarge the depth of focus and to reduce the effect of aberration by providing a ring shaped phase plate at a pupil of a convergence lens or in the vicinity of the pupil. CONSTITUTION:An effective ring shaped phase plate 8 is provided to the pupil position of an objective lens 3 which constitutes an optical head or in the vicinity of the pupil position, a phase difference is generated in a light spot, the spot shape formed on an optical disk 4 is deformed and the effect due to an aberration is reduced. The plate 8 is formed on at least one of the surfaces of the lens 3 which constitutes an optical system that collects light beams and converges it on the disk 4 and the effect of the plate 8 is generated at the pupil location of the lens 3 or in the vicinity of the pupil location. A group lens having the both functions of a collimeter lens 2 and the lens 3, for example, is used as the lens 3. The plate 8 is directly provided to at least one of the surfaces of the lens 3 or the both surfaces or placed with a prescribed distance from the surface.

24. 发明专利

JPH09197581A PSEUDO STEREOSCOPIC PICTURE DISPLAY DEVICE 失效
公开(公告)号：JPH09197581A
公开(公告)日：1997-07-31
申请号：JP713596
申请日：1996-01-19
申请人： HITACHI LTD
发明人： KOMODA MIGAKU , ARIMOTO AKIRA , SHIMANO TAKESHI , TSUJI KAZUTAKA , KANEKO YOSHIYUKI , KONOUE AKIHIKO , TATENO KIMIO
IPC分类号： G03B35/20
摘要： PROBLEM TO BE SOLVED: To reduce the number of projectors to such an extent that the range of the viewing point of an observer is not narrowed so much and to obtain a bright picture by using a directional screen performing directional reflection in a horizontal direction and having the property of a condensing reflection mirror, which is obtained by giving curvature, in a vertical direction. SOLUTION: The cross section of the directional screen 13 in a direction (y) is that of the reflection mirror having the curvature, and the center of curvature and the radius of curvature of the cross section in the direction (y) are made constant. Therefore, the screen 13 functions as a spherical reflection mirror on a plane (yz) with respect to the pictures projected from the projectors 11 and 12. Since the spherical reflection mirror reflects the light made incident in nonparallel with an optical axis symmetrically with respect to the optical axis, the screen 13 is set so that the optical axis of the reflection mirror being the cross section of the screen 13 in the direction (y) may direct somewhat upward. As a result, the pictures projected from the projectors 11 and 12 go toward the observer 15 through a path above the incident light on the plane (yz) after they are reflected by the screen 13.

25. 发明专利

JPH08180350A MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE, AND MAGNETIC RECORDER 失效
公开(公告)号：JPH08180350A
公开(公告)日：1996-07-12
申请号：JP32029894
申请日：1994-12-22
申请人： HITACHI LTD , HITACHI MAXELL
发明人： AKAGI KYO , SAKAMOTO AKITO , KUGIYA FUMIO , KAEDE HIROSHI , KOMODA MIGAKU
IPC分类号： G11B5/66 , G11B5/596 , G11B5/65 , G11B5/73 , G11B5/82 , G11B5/84
摘要： PURPOSE: To precisely write servo information. CONSTITUTION: Pits 14 are arranged on a servo information area 10 of a magnetic film F formed on a substrate S at an interval in the direction of an information recording/reproducing track width. A magnetic signal area 15 magnetically recording the servo information is formed between adjacent pits 14 so as to reach the pit 14, and both edges of the magnetic signal area 15 in the direction of the information recording/reproducing track width are formed by the pits 14. One or plural magnetization inversion 15b are recorded on the magnetic signal area 15.

26. 发明专利

JPH0877640A HIGH DENSITY INFORMATION RECORDING/REPRODUCING METHOD 失效
公开(公告)号：JPH0877640A
公开(公告)日：1996-03-22
申请号：JP6554795
申请日：1995-03-24
申请人： HITACHI LTD
发明人： SUGIYAMA HISATAKA , MAEDA TAKESHI , MIYAMOTO JIICHI , WAKABAYASHI KOICHIRO , SAGA HIDEKI , SHIMANO TAKESHI , SAITO ATSUSHI , AWANO HIROYUKI , ANDO KEIKICHI , USHIYAMA JUNKO , KOMODA MIGAKU
IPC分类号： G11B11/10 , G11B7/00 , G11B7/004 , G11B7/09 , G11B11/105
摘要： PURPOSE: To realize a surface density not less than 10 Gbit/sq.in. by a method wherein the recording/reproduction of fine marks which overcomes the optical diffraction limit is achieved by using presently available light source, optical devices and recording/reproducing technology. CONSTITUTION: A laser beam with a wavelength of 532nm is emitted from a reproduction light source SHG 300 and converged into one direction by a cylindrical lens 303 through a slit 302. The converged beam is inputted to an A/0 modulator 304. The transmitted diffracted beam is converted into a beam having an original beam diameter by a cylindrical lens 305 and the beam is converted into a beam having a diameter, for instance, 3 times the original diameter by a beam expander 307 through a slit 306. The light path of the converted light beam is bent by a deflection mirror 309 and a return mirror 310 and the light beam is inputted to a diffraction lattice 311. The beam is divided into three light beams, i.e., 0-order beam and ± 1 order diffracted beams, by the diffraction lattice and, after passing through a superresolution optical filter 308, enters a light path synthesizing prism 312. Then, the beam is emitted toward a moving optical system 320 which is moving on an optical disc 398 through a return mirror 318 and a light beam splitting prism 319.

27. 发明专利

JPH07153120A MANUFACTURE OF OPTICAL MASTER DISK 失效
公开(公告)号：JPH07153120A
公开(公告)日：1995-06-16
申请号：JP29491393
申请日：1993-11-25
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , HORIGOME SHINKICHI , SUGIYAMA HISATAKA , KOMODA MIGAKU
IPC分类号： G11B7/26
摘要： PURPOSE:To obtain a light spot smaller than the diffraction limit and to manufacture the low-noise substrate by providing a phase shifting means in a laser flux and imparting a phase shift at the time of exposing the surface of the resist to the laser light. CONSTITUTION:The phase shift plate 5 is formed, for example, by depositing, sputtering or CV0-depositing only the central part of the laser beam with a transparent material such as SiO2, SiN on the surface of a transparent glass plate or optically homogeneous plastic plate, etc., so that the ((refractive index) Xthickness) of the deposited film is equal to a half of the wavelength of the laser beam or an odd number multiple of it with the vapor deposition. Thus, the substrate small in the reduction in intensity of the laser beam and very low in noise can be manufactured.

28. 发明专利

JPH11296888A SUPER-RESOLUTION OPTICAL INFORMATION RECORDING/ REPRODUCING DEVICE 失效
公开(公告)号：JPH11296888A
公开(公告)日：1999-10-29
申请号：JP10238198
申请日：1998-04-14
申请人： HITACHI LTD
发明人： KOMODA MIGAKU , SHIMANO TAKESHI , UMEDA MARIKO , NAKAO TAKESHI , ARIYOSHI TETSUO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To make reducible the effects of high density recording/reproducing and the tilt of an optical information medium by providing an optical means attenuating partial light intensity or adding a phase difference to a part of parallel luminous flux emitted from a light source and forming a small-sized spot of a diffraction limit value or below by the optical super-resolution effect. SOLUTION: An emission beam from a semiconductor laser 11 is made into a parallel beam by a collimate lens 12, and a luminous flux cross section is shaped into nearly a circle by a beam shaping prism. The beam passing through an optical element 14 inserted in the vicinity of the optical axial center of the parallel beam is focused on the information recording surface 170 of the optical information medium 17 through a beam splitter 15 by an objective lens 16. Since the part of the beam made incident on the rectangular part 14a of the optical element 14 is attenuated in the light intensity, the part is converged to the diffraction limit value or below through the objective lens 16 by the super-resolution effect, and the small-sized spot is formed. Thus, the information can be high density recorded/reproduced, and a track offset amount due to the tilt of the optical information medium is reduced.

29. 发明专利

JPH08203058A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH08203058A
公开(公告)日：1996-08-09
申请号：JP861995
申请日：1995-01-24
申请人： HITACHI LTD
发明人： KAEDE HIROSHI , KUGIYA FUMIO , MARUYAMA YOJI , AKAGI KYO , KOMODA MIGAKU
IPC分类号： G11B5/66 , G11B5/09 , G11B5/56 , G11B5/596 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/84
摘要： PURPOSE: To produce a perpendicular magnetic recording medium having a servo-pattern small in surface unevenness and to provide its producing method. CONSTITUTION: A magnetic characteristic such as magnetic anisotropy, residual magnetization and coercieve force of a magnetic film 3 is selectively changed in accordance with the servo-pattern by partially changing the presence or absence and the film thickness, etc., of an under coat film 2 for controlling an orientation of the magnetic film 3, in accordance with a servo-pattern or by subjecting the magnetic film to laser-annealing. Then, a signal generated when the pattern is scanned with a magnetic head is used as a servo-signal for positioning of the magnetic head. And, a ROM pattern is formed by the same method.

30. 发明专利

JP2000235729A OPTICAL PARTS FIXING DEVICE AND OPTICAL HEAD USING THE SAME 失效
公开(公告)号：JP2000235729A
公开(公告)日：2000-08-29
申请号：JP3531499
申请日：1999-02-15
申请人： HITACHI LTD
发明人： NAKAO TAKESHI , KOMODA MIGAKU
IPC分类号： G11B7/135 , G02B5/04 , G02B5/18 , G02B7/00
摘要： PROBLEM TO BE SOLVED: To make it possible to facilitate assembly and to embody high assem bly accuracy even when a wedge-like prism is introduced as a beam shaping optical system to a head of a small size and thin type by previously adhering an auxiliary member to optical parts, such as the prism, to be objected. SOLUTION: The wedge-like rising prism 4 consists of a structure obtained by bonding the auxiliary member 402 to a prism body 401. The base surface of the wedge-like rising prism 4 is formed flush with the A side of the base surface of the prism body. An optical casing base surface 1401 is provided with an optical head casing hole part 1402 corresponding to the size of the wedge-like rising prism 4 and after the wedge-like rising prism 4 is inserted therein, the vertex P part of the wedge-like rising prism 4 is pressed to the B side of the optical head casing hole part 1402, by which alignment is carried out. Both are thereafter adhered and fixed by adhesive parts 1403 at >=2 points. As a result, the set angle accuracy of the wedge-like rising prism 4 may be improved and the stability in assembly is improved by using the auxiliary member 40.

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