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公开(公告)号：JP2002092926A
公开(公告)日：2002-03-29
申请号：JP2000280359
申请日：2000-09-14
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , OSATO KIYOSHI , MAEDA FUMISADA
IPC: G02B7/02 , G02B7/08 , G02B13/00 , G11B7/09 , G11B7/125 , G11B7/135 , G11B7/1374 , G11B7/1378
Abstract: PROBLEM TO BE SOLVED: To provide an optical head having an achromatic lens. SOLUTION: The optical head 110 has achromatic lenses 11 and 12 on which the laser beam LB of a blue or a purple-blue color is made incident from a semiconductor laser, objective lenses 14 and 16 which condense the laser beam which transmitted through the achromatic lenses 11 and 12 on an optical disk 80, lens holders 18 and 19 which hold the achromatic lenses 11 and 12 and the objective lenses 14 and 16 so that their optical axes are made coincident, and actuators 13T and 15F which shift the lens holders 18 and 19 in the direction of the focus and/or tracking direction of the optical disk 80. The lens holders 18 and 19 are fixed mutually, and the lenses 11, 12 14 and 16 are shifted unitedly by the actuators 13T and 15F.
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公开(公告)号：JP2001236663A
公开(公告)日：2001-08-31
申请号：JP2000046823
申请日：2000-02-18
Applicant: SONY CORP
Inventor： ICHIMURA ISAO , KIJIMA KOICHIRO , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a position control device for an optical system, capable of highly precisely positioning a lens in an near-field optical system using a solid immersion lens. SOLUTION: An objective lens 2 and a solid immersion lens 3 are fixed to a lens holder 4. The lens holder 4 is moved in the tracking direction of an optical disk 51 by a tracking actuator 5, and moved in a focusing direction by a focus actuator 8. The focus actuator 8 is controlled based on capacitance generated between the solid immersion lens 3 and an optical disk 51.
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公开(公告)号：JP2001202649A
公开(公告)日：2001-07-27
申请号：JP2000009393
申请日：2000-01-18
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , ICHIMURA ISAO , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To constitute an optical lens in such a manner that sufficient strength of adhesion to a lens holder may be obtained in a sufficiently small region. SOLUTION: The optical lens arranged to face a recording medium is constituted by forming a sand texture rough surface region 9 in part of a circumferential direction on the outer periphery on the surface side of an objective lens 2 facing the recording medium. The strength of adhesion of the optical lens to the lens holder is enhanced by the presence of this sand texture rough surface region 9.
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公开(公告)号：JP2001023226A
公开(公告)日：2001-01-26
申请号：JP19503699
申请日：1999-07-08
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , ICHIMURA ISAO , YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To surely record, reproduce or erase information signals even in the case that a distance between an objective lens and an optical disk deviates from a prescribed value. SOLUTION: The optical pickup 10 is provided with a light source driving part 20 that varies the intensity of a laser beam emitted form a light source 11, a processing circuit 16 with a distance detecting function that outputs distance information by detecting a distance between a solid immersion lens 14 and an optical disk 100, and a servo controller 19 that controls the light source driving part 20 based on the distance information and that sets a prescribed light intensity for the laser beam outgoing from the light emitting surface 14a of the solid immersion lens 14 and entering the optical disk 100.
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公开(公告)号：JP2001023192A
公开(公告)日：2001-01-26
申请号：JP19508999
申请日：1999-07-08
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , ICHIMURA ISAO , KOCHIYAMA AKIRA , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To eliminate the need for applying an AR coat to a cover layer on the recording layer of an optical record medium by forming a magnetic field generation means on a surface that opposes the optical record medium of a lens and forming an electrode for detecting capacitance with respect to the optical record medium at the outer-periphery region. SOLUTION: An electrode S for detecting capacitance to a magnetooptical disk 2 is formed at the outer-periphery region of a spiral-shaped coil part 46 on a surface that opposes the magnetooptical disk 2 of a coil-supporting substrate 44. The electrode S is divided into a plurality of portions for each specific region. For example, the electrode S is divided into two portions concentrically. The outer-periphery region of the coil part 46 that is a magnetic field generation element is provided with an optical element with an electrode for detecting the capacitance at an area to the magnetooptical disk 2. Therefore, by measuring the capacitance between the electrode S and the magnetooptical disk 2, the distance between the electrode S and the magnetooptical disk 2 can be set to preset distance.
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Patent Agency Ranking96.发明专利
公开(公告)号：JP2000131502A
公开(公告)日：2000-05-12
申请号：JP30302598
申请日：1998-10-23
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , YAMAMOTO KENJI , ICHIMURA ISAO , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide an optical lens having a high refractive index, to provide a condensing lens which is suitable for a near-field recording and reproducing system by using it and to provide an optical pickup device and an optical recording and reproducing device which cope with a high density and a large capacity of an optical recording medium. SOLUTION: The main component of a first optical lens 2 is constituted of GaN, or the first optical lens 2 is constituted of a GaN single crystal having the crystal structure of a cubic system, or the first optical lens 2 is constituted of the GaN single crystal having a crystal structure of hexagonal system, and the size of a luminous flux made incident on a second optical lens 3 is made small, and the condensing lens 4 is constituted of the first optical lens 2 and the second optical lens 3. In this case, the NA(numerical aperture) of the condensing lens 4 is set to be >=1.5, and the condensing lens 4 is made small in size and light in weight.
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97.发明专利
公开(公告)号：JP2000131501A
公开(公告)日：2000-05-12
申请号：JP30302498
申请日：1998-10-23
Applicant: SONY CORP
Inventor： KIJIMA KOICHIRO , YAMAMOTO KENJI , ICHIMURA ISAO , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain an optical lens having a high refractive index, to obtain a condenser lens 4 adequate for a near field recording and reproducing system, and to make it possible to deal with a trend toward the higher density and larger capacity of an optical recording medium by using GaP as an essential component constituting the optical lens. SOLUTION: The condenser lens 4 composed, successively from an optical recording medium 1 side, of a first optical lens 2 and a second optical lens 3 is fixed to a slider. The essential component of the first optical lens 2 of the case is composed of GaP. The first optical lens 2 is otherwise composed of a GaP single crystal. The first optical lens 2 is so shaped that the objective face, i.e., the face opposite to the optical recording medium 1 is plane and the opposite surface of the objective face is a convex spherical surface and the surrounding blank is a fixed surface to the slider. The GaP single crystal has a cleavage plane at a (110) face and allows the formation of the plane without polishing. Namely, the first optical lens 2 is manufactured without requiring many man-hours by forming the objective face of the first optical lens 2 at the (110) face.
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公开(公告)号：JP2000033487A
公开(公告)日：2000-02-02
申请号：JP20390498
申请日：1998-07-17
Applicant: SONY CORP
Inventor： TAKEDA MINORU , KAI SHINICHI , YAMATSU HISAYUKI , FURUKI MOTOHIRO , TAKESHITA YASUYUKI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To permit the formation of a latent image of a fine pattern on a resist layer by irradiating the resist layer formed on a board with laser beam applying high frequency superpose through an auto-focus mechanism and detecting this reflecting beam. SOLUTION: The laser beam emitted from a beam source 2 irradiates the resist layer 51 formed on the glass board 50 to form the latent image of the prescribed pattern on the resist layer 51. The high frequency convoluted laser beam emitted from the beam source 32 auto-focus, penetrates a correcting lens 33 to correct the chromatic aberration and further, penetrates a polarized- beam splitter 34 and a 1/4 wave length board 35 and directed to a reflecting mirror 36. The high frequency convoluted laser beam passed through the splitter 34 and the 1/4 wave length board 35, is made incident on objective lens 22 as p-polarized beam and the reflected beam of the high frequency superposed laser beam which irradiates the resist layer 51 through the objective lens 22, is used as s-polarized beam and the splippage amount of the focus is efficiently detected with a beam detector 37.
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99.发明专利
公开(公告)号：JPH11259904A
公开(公告)日：1999-09-24
申请号：JP5679698
申请日：1998-03-09
Applicant: SONY CORP
Inventor： KIJIMA KOUICHIROU , YAMAMOTO KENJI , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To provide an optical disk information detecting device detecting optical disk information in an objective lens and an optical disk existing in an optical contact state and an optical disk device using it. SOLUTION: An objective lens 13a and an optical disk 11 are in an optical contact state, and a numerical aperture is constituted to 1 or above. At this time, a light source 22 irradiating a light beam L1 on the optical disk 11 through the objective lens 13a, a photodetcting means 23 detecting return light from the optical disk 11 and a processing circuit 24 detecting optical disk information recorded on a recessed part 11a formed on the optical disk 11 based on the detection signal of the return light from the photodetecting means 23 are provided.
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公开(公告)号：JPH11259882A
公开(公告)日：1999-09-24
申请号：JP5679798
申请日：1998-03-09
Applicant: SONY CORP
Inventor： KIJIMA KOUICHIROU , KAWAKUBO SHIN , OSATO KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To eliminate the need for an initializing process for converting the recording film of a phase transition optical disk into a crystal state. SOLUTION: This optical disk is equipped with a rotary driving means which drives and rotates the phase transition optical disk 11, an optical pickup which irradiates the rotating optical disk with light through a light converging means 13a and detects return light from the recording surface of the optical disk by an optical detector through the light converging means, an actuator which supports a light spot converged on the optical disk by the light converging means movably in a tracking direction, a signal processing circuit which generates a reproduced signal according to the detection signal from the optical detector, and a servo circuit which moves the light spot converted on the optical disk by the light converging means in the tracking direction, and the light converging means is supported by a holding means 21 which is held at a specific distance to the optical disk.
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