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公开(公告)号：JPH02149948A
公开(公告)日：1990-06-08
申请号：JP30254988
申请日：1988-11-30
Applicant: SONY CORP
Inventor： OSUE TADASHI , OSATO KIYOSHI
Abstract: PURPOSE:To select a winding angle so that it becomes a desired angle, to simplify the constitution of an optical tape traveling mechanism and to obtain a reproducing device whose constitution is simple as a whole by branching and supplying a light beam to plural optical heads mounted on a rotating drum. CONSTITUTION:The plural optical heads 3A, 3B and 11 are arranged on the rotating drum 8. By branching the light beam LA1 with the aid of a light branching means 10 and outputting it to the plural optical heads 3A, 3B and 11, the light beam LA1 is supplied to the plural heads 3A, 3B and 11 by one light source 2, 4, 5, 6, and 7. Then, the constitution of a whole optical system is simplified. Besides, by arranging the plural optical heads 3A, 3B and 11 on the rotating drum 8 and making the winding angle of an optical recording medium 15 small, the traveling mechanism of the optical recording medium 15 is simplified by amount of that. Thus, the whole constitution is simplified.
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公开(公告)号：JPS6214342A
公开(公告)日：1987-01-22
申请号：JP15367885
申请日：1985-07-12
Applicant: SONY CORP
Inventor： OSATO KIYOSHI , NAITO MINE
IPC: G11B7/135
Abstract: PURPOSE:To enable the reproducing of recording information by providing a driving device that makes retire a plate of 1/4 wave length from an optical path between a recording medium and a polarization beam splitter when a beam reflected by the recording medium is detected. CONSTITUTION:A beam 13 transmitted a polarization beam splitter 14 transmits an objective lens 15 and if focused on the recording surface of a disk 15. However, when the disk is an optical one, a plate of 1/4 wave length 17 is positioned in the optical path between the polarization beam splitter 14 and the objective lens 15 by the driving device. When the disk 16 is a photomagnetic disk, the plate of 1/4 wave length is made retire from the optical path by the driving device. The beam 13 that is reflected by the disk 16 and transmits the objective lens 15 and farther, reflected by the polarization beam splitter 14 transmits a plate of 1/2 wave length and is made incident on a polarization beam splitter 22. Thereby, it is possible to reproduce the recording information from both of the recording media of reflectance of changeable type and of plane of polarization of rotatable type.
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公开(公告)号：JPS61250844A
公开(公告)日：1986-11-07
申请号：JP9281485
申请日：1985-04-30
Applicant: SONY CORP
Inventor： OSATO KIYOSHI , TERAYAMA YASUNARI , FUKUMOTO ATSUSHI
Abstract: PURPOSE:To eliminate the DC fluctuation of a tracking error signal by using a beam incident part of a header part as a tilted part so that a side beam incident to the header of a semiconductor laser is reflected and not made incident again to a recording medium thereby forming the reflected beam with nearly main beam only. CONSTITUTION:The face of the header 11 onto which the side beam via a collimator lens 2 is made incident is formed tiltedly so that its reflection beam is not made incident again in the collimator lens 2. In using not a coarse face but a mirror surface for the tilted part 11S in this case so as to avoid irregular reflection, the effect is large. Further, the reflected light of the side beam from the header 11 does not enter the collimator lens 2 by deciding the relation of thetah+thetaG-thetac>0, where thetah is an angle of the tilted part 11S to a face perpendic ular to the main beam, thetaG is an angle between the main beam and the side beam, N.Ac is the N.A of the collimator lens 2 and theta=sin NAc.
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公开(公告)号：JP2002269797A
公开(公告)日：2002-09-20
申请号：JP2001062957
申请日：2001-03-07
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain the stable polarization state independently of a fluctuation of refractive index of liquid crystal molecule due to the temperature change, when a liquid crystal element is used as a wavelength plate. SOLUTION: When the liquid crystal element is used as a 1/2 wavelength plate 104, two liquid crystal elements 104A, 104B are arranged so that the alignment directions of each liquid crystal molecule are orthogonally crossed. Then, the difference (A-B) between the phase difference A given by one liquid crystal element 104A to the polarization parallel to the alignment with respect to the polarization orthogonally crossed to the alignment and the phase difference B given by another liquid crystal element 104B to the polarization parallel to the alignment with respect to the polarization orthogonally crossed to the alignment, is expressed as l/2+nλ. Even when the temperature change is generated, the phase differences for the liquid crystal elements 104A, 104B given respectively to the polarization parallel to the alignment respect to the polarization orthogonally crossed to the alignment are varied but these varied amounts are almost the same. Consequently, the phase difference given by two alignments is λ/2+nλ and unchanged.
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公开(公告)号：JP2002251774A
公开(公告)日：2002-09-06
申请号：JP2001046432
申请日：2001-02-22
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To appropriately correct wave front aberration caused in an optical system by a liquid crystal element without being affected by a quarter wave plate disposed on an optical path from a light source via a recording medium to a light detector. SOLUTION: A liquid crystal element A4 is disposed at an advancing light path (a first light path) from the laser light source 1 to an optical disk 8 so as to align a liquid crystal in a polarization direction of light made incident into the optical disk 8 to correct the aberration of advancing light. Separately from the liquid crystal element A4, a liquid crystal element B10 is additionally disposed at returning light path (a second light path) from the quarter plate 5 to the light detector 13 so as to align the liquid crystal in the polarization direction of returning light to correct the aberration of the returning light. Thus, since the polarization states of advancing light and returning light are different from each other by 90 degrees, respective aberrations are independently corrected.
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Patent Agency Ranking
公开(公告)号：JP2002116378A
公开(公告)日：2002-04-19
申请号：JP2000308296
申请日：2000-10-06
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To facilitate manufacture and assembly and the evaluation of a manufacture error and an assembly error while achieving a large numerical aperture and excellent light condensing characteristic. SOLUTION: This objective lens is constituted of two lenses 1 and 2 in two groups, and its numerical aperture is >=0.8, and a 1st surface S1 and a 3rd surface S3 are made aspherical or spherical, and a 2nd surface S2 and a 4th surface S4 are made planar.
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公开(公告)号：JP2001023241A
公开(公告)日：2001-01-26
申请号：JP19674299
申请日：1999-07-09
Applicant: SONY CORP
Inventor： KURODA YUJI , KIJIMA KOICHIRO , ICHIMURA ISAO , OSATO KIYOSHI , SAITO KIMIHIRO
IPC: G11B7/254 , G11B7/24 , G11B7/257 , G11B11/105
Abstract: PROBLEM TO BE SOLVED: To provide an optical recording medium for a near field system which has high intensity of reproduced signals and which is hardly damaged on the surface, and to provide a production method of the medium and an optical recording device equipped with that optical recording medium. SOLUTION: The optical recording medium consists of a substrate 11, reflection film 12 formed on the substrate, recording layer 14 formed on the reflection film, and first protective layer 15 formed on the recording layer 14. In the medium, information is recorded and reproduced by irradiating the recording layer 14 with light from an optical system through the first protective layer 15 side. Further, a surface protective layer 16 is formed on the first protective layer 15. The gap between the surface protective layer 16 and the optical system presents a near field, and the surface protective layer 16 has a specified refractive index and film thickness to mitigate changes in the reproducing signal intensity caused by changes in the gap, and the layer preferably consists of a silicon oxide film having >=100 nm film thickness. The invention also provides a production method of the medium and an optical recording device equipped with that optical recording medium.
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公开(公告)号：JP2001023227A
公开(公告)日：2001-01-26
申请号：JP19503899
申请日：1999-07-08
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , ICHIMURA ISAO , KURODA YUJI , OSATO KIYOSHI , YAMAMOTO KENJI
Abstract: PROBLEM TO BE SOLVED: To prevent heat transfer from an objective fens to an optical disk, in the case that the objective lens is disposed in optical contact with the optical disk. SOLUTION: The emitting position varying means 20 varies the emitting position of a laser beam on the surface 14a opposite to a solid immersion lens 14 by movably operating a first relay lens 21 with a relay lens actuator 23, in the manner that an optical spot on the optical disk 100 is displaced in the tangential line direction of the recording track of the optical disk 100, while the optical spot is formed by the laser beam passing through the position varying means 20, entering an objective lens 13 and the solid immersion lens 14, and converging on these lenses 13, 14.
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公开(公告)号：JP2000195074A
公开(公告)日：2000-07-14
申请号：JP19652899
申请日：1999-07-09
Applicant: SONY CORP
Inventor： ICHIMURA ISAO , KIJIMA KOICHIRO , KURODA YUJI , YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide an optical head mounting an optical means for converging a laser beam being projected onto an optical recording medium in which numerical aperture can be increased through a solid immersion lens and the air gap can be controlled accurately based on the capacitance while simplifying the actuator or signal processing for focus servo furthermore. SOLUTION: An optical head 1 comprises an objective lens 2 for converging a laser beam L, a solid immersion lens 3 interposed between the objective lens 2 and an optical recording medium 51, a member 4 holding the lenses 2, 3 integrally, and a mechanism 5a for moving the holding member 4 in the direction of the optical axis of the laser beam L, wherein a conductive material is employed on the surface facing the optical recording medium 51.
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公开(公告)号：JP2000163781A
公开(公告)日：2000-06-16
申请号：JP33147198
申请日：1998-11-20
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , ICHIMURA ISAO , OSATO KIYOSHI
IPC: G11B7/125 , G11B7/135 , G11B11/10 , G11B11/105
Abstract: PROBLEM TO BE SOLVED: To provide an optical disk device capable of suppressing deviations of manufacturing accuracy of optical systems and optical disks and of oscillation wavelengths of semiconductor lasers by stabilizing the position of a spot on a recording surface and to provide the focal position control method of the optical disk device. SOLUTION: In an optical disk device having a light source 21 outputting a laser light beam, a light converging means 41 converging an output light from the light source on the recording surface of an optical disk 1 and a holding mechanism holding the light converging means at a certain distance as to a focus direction, this device is provided with a wavelength control means 20 which is capable of adjusting the wavelength of the output light from the light source by allowing one part of the output light to be made incident on the means 20 and by adjusting the wavelength of the incident laser beam and by returning the laser beam toward the light source 21.
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