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公开(公告)号：EP1043615A4
公开(公告)日：2007-01-10
申请号：EP99949382
申请日：1999-10-22
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , OHSATO KIYOSHI
CPC classification number: B82Y10/00 , G11B7/0948 , G11B7/1374 , G11B7/1378 , G11B7/13927 , G11B2007/0006 , G11B2007/13727
Abstract: An optical head having an objective lens with a high numerical aperture of 0.8 or more comprising, in order to correct a spherical aberration due to the manufacture errors of an optical recording medium and a lens, to correct a chromatic aberration sufficiently even when a short-wave semiconductor laser is used, and to correct an aberration which is caused when an identical optical system is used for beams of different wavelengths: a light source; an objective lens (20) composed of two or more lenses and having a numerical aperture of 0.80 or more; and an aberration correcting lens group 1 arranged between those light sources and objective lens (20) and composed of a positive lens group (3) and a negative lens group (2). The aberration correcting lens group (1) corrects the spherical aberration to be caused on the individual optical faces of the optical system by making variable the distance between the positive lens group (3) and the negative lens group (2) in the optical axis direction.
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公开(公告)号：DE69232039T2
公开(公告)日：2002-06-27
申请号：DE69232039
申请日：1992-05-13
Applicant: SONY CORP
Inventor： MASUDA HISASHI , OHSATO KIYOSHI , FUKUMOTO ATSUSHI
IPC: G02F1/37 , H01S3/02 , H01S3/04 , H01S3/042 , H01S3/06 , H01S3/0941 , H01S3/101 , H01S3/109 , H01S3/131 , H01S3/094
Abstract: A laser light generating apparatus comprises a light source (1) for generating an exciting light beam, a condenser lens (2) for converging the exciting light beam from the light source (1), a laser medium (5) for generating a laser light of first wavelength by the radiation of the exciting light beam supplied thereto through the condenser lens (2), a nonlinear optical crystal element (6) for generating a second laser light by the radiation of the first laser light generated from the laser medium (5), a pair of reflecting means (7, 3) for constituting a laser resonator (9) together with at least the laser medium (5) and the nonlinear optical crystal element (6), a deflecting element (21) for deflecting an optical axis of the second laser light emitted from reflecting means (7) provided at the emitting side of the pair of reflecting means, detecting means (22) for detecting a part of a light beam output from reflecting means (7) disposed at the output side of the pair of reflecting means, control means (23 to 25) for controlling the light source (1) on the basis of a detected output from the detecting means (22) and a housing (11) for housing a base on which there are disposed at least the light source (1), the condenser lens (2), the laser medium (5) the nonlinear optical crystal element (6), the deflecting element (21) and the detecting means (22).
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公开(公告)号：ES2149435T3
公开(公告)日：2000-11-01
申请号：ES96401271
申请日：1996-06-12
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：AT195829T
公开(公告)日：2000-09-15
申请号：AT96401271
申请日：1996-06-12
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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公开(公告)号：AU5580796A
公开(公告)日：1997-01-02
申请号：AU5580796
申请日：1996-06-06
Applicant: SONY CORP
Inventor： UEMURA KAMON , OHSATO KIYOSHI , YAMAKAWA AKIO , UTSUMI MASAMICHI
Abstract: An optical pickup includes a light source (21) for radiating a light beam, a diffraction element (22) for separating a light beam radiated from the light source into at least three beams, namely a main beam and two side beams, an objective lens (25) for converging the light beams separated by the diffraction element onto a signal recording surface of an optical recording medium (11), a light receiving unit (24) having a four-segment first light receiving portion (71) for receiving the main beam reflected by the recording surface of the optical recording medium and second and third light receiving portions (72, 73) arranged on respective sides of the first light receiving portion (71) for receiving the side beams reflected by the recording surface of the optical recording medium, and a calculation unit (26) for generating one tracking signal based on respective outputs of the first light receiving portion and for generating another tracking signal based on outputs of the second and third light receiving portions. In preferred emodiments of the apparatus, a disc discrimination unit sends a detection output of the optical disc both to the changeover switch selecting the desired tracking error signal and to an aperture ratio variable control unit.
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Patent Agency Ranking
公开(公告)号：DE69020988T2
公开(公告)日：1995-11-23
申请号：DE69020988
申请日：1990-09-11
Applicant: SONY CORP
Inventor： NARAHARA TATSUYA , OHSATO KIYOSHI , KAMATANI YOSHITERU , MIYOSHI HIROSHI
Abstract: A control circuit for controlling the position of a rotary head in an optical tape recording/reproducing apparatus controls the position of the head at the instant that it comes to face a tape (T) based upon a desired head position derived from a preceding period in which it was facing the tape. A head position error signal (ef) is sampled (28) and added (30) to a sample of a head position signal (Sy) obtained (27) during a period when the head was facing the tape and held during the time the head is not facing the tape. The instant the head begins to face the tape (T) once again, the desired value that has been held is applied to drive means (24, 25) for the head in order to reduce the pull-in time of the control circuit and provide more time for information recording/reproduction during the time the head is facing the tape.
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公开(公告)号：DE69020988D1
公开(公告)日：1995-08-24
申请号：DE69020988
申请日：1990-09-11
Applicant: SONY CORP
Inventor： NARAHARA TATSUYA , OHSATO KIYOSHI , KAMATANI YOSHITERU , MIYOSHI HIROSHI
Abstract: A control circuit for controlling the position of a rotary head in an optical tape recording/reproducing apparatus controls the position of the head at the instant that it comes to face a tape (T) based upon a desired head position derived from a preceding period in which it was facing the tape. A head position error signal (ef) is sampled (28) and added (30) to a sample of a head position signal (Sy) obtained (27) during a period when the head was facing the tape and held during the time the head is not facing the tape. The instant the head begins to face the tape (T) once again, the desired value that has been held is applied to drive means (24, 25) for the head in order to reduce the pull-in time of the control circuit and provide more time for information recording/reproduction during the time the head is facing the tape.
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公开(公告)号：DE69018150D1
公开(公告)日：1995-05-04
申请号：DE69018150
申请日：1990-07-18
Applicant: SONY CORP
Inventor： OHSATO KIYOSHI , UDAGAWA TOSHIKI , OKADA HITOSHI
Abstract: An optical recording and/or reproducing apparatus comprising a light beam generator (10), a photodetector (14), an optical path forming device (12,20,22,24,26,28) for causing a light beam from the light beam generator (10) to impinge upon an optical disc (D) and for guiding the light beam emanating from the optical disc (10) to the photodetector (14), and a signal generating circuit block (40) operative to obtain based on a detection output obtained from the photodetector (14) a first signal representing a tracking condition of the light beam in relation to a record track portion on the optical disc (D) and a second signal different in phase by substantially ninety degrees from the first signal and to produce a tracking error signal which satisfies the following equation: St = S1 / {K (Sl + S2 ) + S2} where St stands for the tracking error signal, S1 stands for the first signal, S2 stands for the second signal and K stands for a constant equal to or more than 1.
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公开(公告)号：MY105948A
公开(公告)日：1995-02-28
申请号：MYPI19901147
申请日：1990-07-09
Applicant: SONY CORP
Inventor： FUKUMOTO ATSUSHI , OHSATO KIYOSHI
Abstract: AN OPTICAL RECORDING AND/OR REPRODUCING APPARATUS IN WHICH A MAIN LIGHT BEAM AND AT LEAST TWO AUXILIARY LIGHT BEAMS ARE CAUSED TO IMPINGE UPON A DISC (D) FOR RECORDING INFORMATION THEREON OR REPRODUCING INFORMATION THEREFROM IN SUCH A MANNER THAT LIGHT BEAM SPOTS FORMED ON THE DISC (D) BY TWO AUXILIARY LIGHT BEAMS ARE RESPECTIVELY DISTANT SUBSTANTIALLY THE SAME DISTANCE FROM A LIGHT BEAM SPOT FORMED ON THE DISC (D) BY THE MAIN LIGHT BEAM WITH A SPACE THEREBETWEEN IN A RADIAL DIRECTION OF THE DISC (D) CORRESPONDING TO N/2 TIMES A TRACK PITCH ON THE DISC (D), AND THEN GUIDED FROM THE DISC (D) TO A PHOTOSENSOR (14) COMPRISING A FIRST PHOTODETECTING ELEMENT (60) DIVIDED INTO TWO PARTS FOR DETECTING THE MAIN LIGHT BEAM AND A SECOND PHOTODETECTING ELEMENT (62) DIVIDED INTO TWO PARTS FOR DETECTING BOTH OF TWO AUXILIARY LIGHT BEAMS, AND A TRACKING ERROR SIGNAL IS PRODUCED BASED ON A DIFFERENCE BETWEEN DETECTION OUTPUTS DERIVED RESPECTIVELY FROM TWO PARTS OF THE FIRST PHOTODETECTING ELEMENT (60) AND A DIFFERENCE BETWEEN DETECTION OUTPUTS DERIVED RESPECTIVELY FROM TWO PARTS OF THE SECOND PHOTODETECTING ELEMENT (62) ONE OF WHICH IS SUBJECTED TO LEVEL ADJUSTMENT (52) FOR COMPENSATING A DIFFERENCE IN INTENSITY BETWEEN THE MAIN LIGHT BEAM AND EACH OF THE TWO AUXILIARY LIGHT BEAMS.(FIG. 1),(FIG. 4)
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公开(公告)号：AT84375T
公开(公告)日：1993-01-15
申请号：AT87307067
申请日：1987-08-10
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , OHSATO KIYOSHI
IPC: G11B7/00 , G11B7/004 , G11B7/0055 , G11B7/007 , G11B7/013 , G11B7/125 , G11B7/126 , G11B7/135 , G11B11/105
Abstract: An apparatus for recording and reproducing data into/from an optical disc is provided. This apparatus comprises: an optical disc having an optical recording medium into and from which data can be written and erased; a laser diode (1) to write, erase, and read out data into and from the optical disc; and a power setting circuit (4A-C,5A-C,6A-C,7A-C,8A-C) for sampling and holding a detection output from a photo diode (2) to detect a light emission power of the laser diode (1), for comparing the value sampled and held with a target value, and for setting the power of the laser diode (1). The light emission power of the laser diode (1) in each of the data writing, erasing, and reading modes is controlled by the power setting means. A part of a recording area of the optical disc is provided with an extracting area (SA) to sample and hold the detection output from the photo diode (2).
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