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51. 发明专利

JP2002109758A INFORMATION RECORDING DEVICE FOR THREE-DIMENSIONAL OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JP2002109758A
公开(公告)日：2002-04-12
申请号：JP2000301069
申请日：2000-09-29
申请人： TOSHIBA CORP
发明人： TSUKAMOTO TAKAYUKI , MATSUMOTO KAZUNORI , NISHIZAWA HIDEYUKI , HIRAO AKIKO
IPC分类号： G11B7/24 , G11B7/0045 , G11B7/0065 , G11B7/09 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1353
摘要： PROBLEM TO BE SOLVED: To provide an information recording device that records information on a three-dimensional optical recording medium that records information as a hologram and can realize the tracking and focusing of recording light with good precision. SOLUTION: The device is provided with a three-dimensional optical recording medium having a recording area, interfering in the recording light and recording information as the hologram, a light source for recording that emits the recording light to record the hologram on the optical recording medium, a light source for adjusting a position that irradiates the optical recording medium, reflects this medium, and emits position adjusting light for adjusting position relative to the light source for recording and the optical recording medium, a first collection means that condenses the recording light from the light source for recording and leads it to the optical recording medium, a second collection means that condenses the position adjusting light from the light source for adjusting the position and leads it to the optical recording medium, a means that detects the position adjusting light reflected in the optical recording medium and obtains optical power, and a means adjusting a position relative to the light source for recording and the optical recording medium based on the optical power.

52. 发明专利

JP2002094168A SEMICONDUCTOR LASER DEVICE AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002094168A
公开(公告)日：2002-03-29
申请号：JP2000282852
申请日：2000-09-19
申请人： TOSHIBA CORP , TOSHIBA ELECTRONIC ENG
发明人： KURONAGA KOICHI , FUKUOKA KAZUO , IIDA SEIJI , OKADA MAKOTO
IPC分类号： H01L23/12 , G11B7/125 , G11B7/127 , G11B7/1275 , H01S5/02 , H01S5/022 , H01S5/06 , H01S5/40
摘要： PROBLEM TO BE SOLVED: To provide a semiconductor laser device with a semiconductor laser element for light pickup having an excellent 3-beam return light countermeasure, having large mass productivity and using a 3 beam method having high accuracy, and its manufacturing method. SOLUTION: In the semiconductor laser device containing one ore more of LD chips 101 used for light pickup using the 3 beam method and mounting the LD chips on a metallic stem 108 through a sub-mount 102, the side face of the sub-mount just under the laser-beam outgoing side faces of the LD chips is arranged while being inclined (a slope 111) so as to form an angle θ from 3 deg. to 30 deg. to the laser-beam outgoing side face. The sub-mounts used in this case are mass-produced by cutting sub-mount substrates by dicing. When 3-beam return light is returned to the sub-mount side, reflected light is reflected so as not to be mixed with an optical system on the sub-mount side face, on which the LD chips are loaded, and the possibility of the causing of a tracking error is reduced remarkably.

53. 发明专利

JP2001357543A OPTICAL HEAD, OPTICAL RECORDING/REPRODUCING DEVICE AND LD MODULE 失效
公开(公告)号：JP2001357543A
公开(公告)日：2001-12-26
申请号：JP2000178315
申请日：2000-06-14
申请人： TDK CORP
发明人： SHIBUYA GIICHI
IPC分类号： G11B7/00 , G11B7/09 , G11B7/12 , G11B7/123 , G11B7/125 , G11B7/127 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical head, an optical recording/reproducing device and an LD module which have a function for reducing a DC offset, also can reduce the number of light receiving elements and an installing area smaller than heretofore and are easily miniaturized, in the optical heat or the optical recording/reproducing device on which two kinds of light sources are mounted. SOLUTION: Two light sources 2, 3 which exit light beams different in wavelength are simultaneously operated. Reflected light beams from an optical recording medium of these two kinds of laser beams are simultaneously detected by detectors 4, 5. When one side of light beam of the light beams having two kinds of wavelengths is focused on the optical recording medium and is used for recording/reproducing, the spot diameter on the optical recording medium of the other side of nonfocus side light beam is set larger than that of one side of light beam. Reflected light having the large spot diameter is used for removing the DC offset of a tracking error signal.

54. 发明专利

JP2001332797A SEMICONDUCTOR LASER CHIP, SEMICONDUCTOR LASER DEVICE, AND OPTICAL PICKUP 失效
公开(公告)号：JP2001332797A
公开(公告)日：2001-11-30
申请号：JP2000147200
申请日：2000-05-19
申请人： SHARP KK
发明人： ARIYOSHI AKIRA
IPC分类号： G11B7/08 , G11B7/125 , G11B7/127 , G11B7/135 , H01S5/02 , H01S5/022
摘要： PROBLEM TO BE SOLVED: To shut off noise caused by return light of sub beam while a system is entirely downsized such that an optical pickup is not placed out of an optical disc. SOLUTION: A junction surface of a semiconductor laser chip has a light- emitting position, and a distance between the light-emitting position and one of the sides of the semiconductor laser chip is set at 80 μm or less.

55. 发明专利

JP2001325745A OPTICAL RECORDING MEDIUM AND REPRODUCING DEVICE AND RECORDING REPRODUCING DEVICE FOR THE SAME 失效
公开(公告)号：JP2001325745A
公开(公告)日：2001-11-22
申请号：JP2000143821
申请日：2000-05-16
申请人： SONY CORP
发明人： TAMADA SAKUYA
IPC分类号： G11B7/246 , B41M5/26 , G11B7/004 , G11B7/0045 , G11B7/005 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1356 , G11B7/1362 , G11B7/1365 , G11B7/1381 , G11B7/24 , G11B7/244 , G11B7/257
摘要： PROBLEM TO BE SOLVED: To provide an optical recording medium which can realize an optical memory to produce reproducing signals with high S/N. SOLUTION: The medium has a laminated structure 4 having a light emitting layer 3 and a recording layer 2. The light emitting layer 3 consists of a light emitting material which emits fluorescent light by excitation by reproducing laser light, and the recording layer 2 consists of a material which can change at least the refractive index or absorption coefficient for the light emitting from the light emitting layer by recording laser light. The recording layer 2 is disposed nearer to the incident side of the reproducing laser light than the light emitting layer 3. The recorded information in the recording layer recorded by changing the refractive index or absorption coefficient is read out as changes in the intensity of the light emitting from the light emitting layer 3 by irradiation of the reproducing laser light.

56. 发明专利

JP2001319365A FLOATING RECODING HEAD, DISK DEVICE AND METHOD FOR PRODUCING THE HEAD 失效
公开(公告)号：JP2001319365A
公开(公告)日：2001-11-16
申请号：JP2000136905
申请日：2000-05-10
申请人： FUJI XEROX CO LTD
发明人： KAMIYANAGI KIICHI , OZAWA TAKASHI
IPC分类号： G11B5/31 , G11B5/00 , G11B5/02 , G11B5/39 , G11B5/40 , G11B5/48 , G11B5/60 , G11B7/12 , G11B7/122 , G11B7/123 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1387 , G11B7/22 , G11B11/10 , G11B11/105 , H01S5/022 , H01S5/40
摘要： PROBLEM TO BE SOLVED: To provide a floating recording head which ensures high mass productivity, can be precisely produced in a miniaturized shape and attains high recording and transfer rates at a low cost and to provide a disk device and a method for producing the head. SOLUTION: A semiconductor crystal is grown on the rear end face 3a of a substrate 3 of a single crystal of sapphire or the like to form a semiconductor laser oscillation part 2 and a slider face 6 comprising an inclined plane 6a, a depression 6b and protrusions 6c is formed on the light-emitting face 4 of the laser oscillation part 2 and the undersurface of the substrate 3 to produce the objective floating recording head 1.

57. 发明专利

JP2001266389A OPTICAL HEAD USING NEAR FIELD LIGHT 失效
公开(公告)号：JP2001266389A
公开(公告)日：2001-09-28
申请号：JP2000081580
申请日：2000-03-23
申请人： TDK CORP
发明人： YAMADA MINORU , KINOUCHI MITSURU
IPC分类号： G11B7/125 , G11B7/127 , G11B7/13 , H01S5/028 , H01S5/062 , H01S5/12
摘要： PROBLEM TO BE SOLVED: To provide an optical head capable of recording information in an optical recording medium with high density and reading information, which is recorded densely, sensitively though its constitution is simple. SOLUTION: In a distribution feedback type laser 11, an active layer 12 is inserted by clad layers 13 and 14, the first reflecting members 15 having periodical waveformed structure is formed closely to the active layer in one of the clad layers, the second reflecting member 20 including a metallic film 22 having the emitting window 22a of a fine opening formed is formed on one end face and the third reflecting member 23 is formed with a multi-layered dielectric film on the other end face. The optical recoding medium 27 arranged at a near field is irradiated with laser beams intensity-modulated by information emitted from the emitting window of the laser 11 to perform recording. Laser beams reflected by the optical recording medium is returned to a distribution feedback type laser through the emitting window and voltage change occurring between current injecting electrodes to reproduce recorded information. Otherwise, the returned beams are amplified by the distribution feedback type laser and the laser beam emitted from the third reflecting member is photodetected by an optical detector to be reproduced.

58. 发明专利

JP2001176106A PICKUP DEVICE AND INFORMATION RECORDING/REPRODUCING DEVICE HAVING ITS PICKUP DEVICE 失效
公开(公告)号：JP2001176106A
公开(公告)日：2001-06-29
申请号：JP36121599
申请日：1999-12-20
申请人： PIONEER ELECTRONIC CORP
发明人： MAEDA TAKANORI
IPC分类号： G11B7/005 , G11B7/125 , G11B7/126 , G11B7/127 , G11B7/135 , G11B7/1353
摘要： PROBLEM TO BE SOLVED: To reproduce information in which crosstalk is restrained without erasing information already recorded in an information recording medium or the like. SOLUTION: A light source 1 emitting a first light and a second light whose polarizing directions are orthogonal each other is provided, and an optical disk 7 is irradiated with light beams generated by converging these light by an objective lens 6 through a grating 2 which merely transmits the first light and diffracts the second light at prescribed diffraction efficiency. When information is recorded, the second light is set in the lights out state or in the low power state, and information is recorded with light beams generated by the first light. When information is reproduced, both first and second light are emitted information is reproduced with light beams generated by the first light and also an adjacent track is irradiated with light beams generated based on diffracted light generated by the second light being diffracted. Thus, when information is reproduced, the adjacent track is irradiated with low power light beams, and information for removing a crosstalk component is obtained without erasing information or the like.

59. 发明专利

JP2001093179A OPTICAL PICKUP 失效
公开(公告)号：JP2001093179A
公开(公告)日：2001-04-06
申请号：JP26643499
申请日：1999-09-21
申请人： PIONEER ELECTRONIC CORP
发明人： OTAKI MASARU , MURAO NORIAKI
IPC分类号： G02B5/18 , G11B7/00 , G11B7/125 , G11B7/127 , G11B7/135 , G11B7/1353
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup suitable for miniaturization and capable of recording and reproduction to the optical disk or recording surface of different corresponding wavelengths. SOLUTION: This optical pickup is provided with a first light source for emitting a first light beam having a first wavelength, a second light source for emitting a second light beam having a second wavelength longer than the first wavelength, a condensing lens for converging the first and second light beams to the information recording surface of a recording medium and a diffraction optical element arranged in an optical path from the first and second optical sources to the condensing lens. The condensing lens converges the diffracted light beam of a first diffraction order of the first light beam from the diffraction optical element as information reading light or information recording light and converges the diffracted light beam of a second diffraction order lower than the first diffraction order of the second light beam from the diffraction optical element as the information reading light or the information recording light.

60. 发明专利

JP2001085796A SEMICONDUCTOR LASER ELEMENT AND OPTICAL INFORMATION REPRODUCING DEVICE 失效
公开(公告)号：JP2001085796A
公开(公告)日：2001-03-30
申请号：JP2000205787
申请日：2000-07-06
申请人： SHARP KK
发明人： ITO SHIGETOSHI , YAMAZAKI YUKIO , TANETANI MOTOTAKA
IPC分类号： G11B7/125 , G11B7/127 , H01S5/00 , H01S5/20 , H01S5/32 , H01S5/323 , H01S5/343
摘要： PROBLEM TO BE SOLVED: To suppress the ripple of a far field pattern of a semiconductor laser, by so setting the compositions and the film thicknesses of its upper and lower guiding layers that the ripple of its far field pattern in the vertical direction to the surface of its laminated layer is suppressed. SOLUTION: In a semiconductor laser element 100, the compositions and the film thicknesses of its n-Iny1Ga1-y1N lower guiding layer 104 (film thickness d1 μm) and its p-Iny2Ga1-y2N upper guiding layer 107 (film thickness d2 μm) are so set that the condition of neq>=nGaN is satisfied between an equivalent refractive index neq of its oscillation mode and a refractive index nGaN of its GaN layer 101. The case satisfying this condition exists about within the scope of 0.06>=d1+d2, 0.01

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