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公开(公告)号：DE69019248T2
公开(公告)日：1995-09-14
申请号：DE69019248
申请日：1990-07-10
Applicant: SONY CORP
Inventor： OHSATO KIYOSHI , FUKUMOTO ATSUSHI
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.
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公开(公告)号：DE69021018D1
公开(公告)日：1995-08-24
申请号：DE69021018
申请日：1990-11-27
Applicant: SONY CORP
Inventor： MIYOSHI HIROSHI , KAMATANI YOSHITERU , OZUE TADASHI , NARAHARA TATSUYA , OHSATO KIYOSHI
IPC: G11B7/003 , G11B7/085 , G11B7/09 , G11B7/135 , G11B7/1359 , G11B11/105 , G11B7/00
Abstract: A rotary optical head apparatus comprises a first rotary member (18) carrying an objective lens (22) and a second rotary member (28) carrying an image rotator (36). The two rotary members (18, 28) are supported for rotation by means of a single common support shaft (11) so that the axes of rotation of the two rotary members (18, 28) coincide with each other with a high degree of accuracy. Consequently, the linearity of a scanning line of a beam spot which is scanned on an optical magnetic tape (10) is ensured with a high degree of accuracy.
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公开(公告)号：DE69018150T2
公开(公告)日：1995-08-03
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：HK95995A
公开(公告)日：1995-06-23
申请号：HK95995
申请日：1995-06-15
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , OHSATO KIYOSHI
IPC: G11B7/004 , G11B7/00 , 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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公开(公告)号：AT94677T
公开(公告)日：1993-10-15
申请号：AT88302687
申请日：1988-03-25
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , OHSATO KIYOSHI
Abstract: An apparatus for counting a number of record tracks which an optical head (2) traverses on a basis of a periodical track transverse information INFTR representing the traverse of the head across the record tracks. The periodical track transverse information INFTR is derived by sampling a track information of the record tracks preformed discretely on record tracks TR. In the track counting apparatus (6), a tracking signal generating circuit is installed for generating tracking signals VOP and VOQ which vary their frequencies and phases so as to follow those of the track transverse information INFTR. The number of record tracks which the optical head (2) has traversed are counted on the basis of the tracking signals VOP and VOQ. The tracking signals VOP and VOQ have continous waveforms so that the number of the tracks can accurately be counted even if only a discrete information is derived as the track transverse information INFTR.
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Patent Agency Ranking
公开(公告)号：CA1206613A
公开(公告)日：1986-06-24
申请号：CA431828
申请日：1983-07-05
Applicant: SONY CORP
Inventor： KUWABARA SHINICHIRO , OHSATO KIYOSHI , SUGIKI MIKIO
Abstract: OPTICAL DISC PLAYERS In an optical disc player in which a reading light beam is caused to impinge on an optical disc having a record track formed with an alignment of geometric variations such as a plurality of pits provided in response to information to be modulated in intensity by the record track and a photodetector is provided for detecting the reading light beam coming from the optical disc to generate an output varying in response to the variations in intensity of the detected reading light beam; there are provided first circuit means for producing a reproduced information signal having level variations representing the geometric variations and a tracking error signal which may have level variations depending on the size of each segment of the geometric variations on the strength of the output of the photodetector, second circuit means for detecting the duration of a portion corresponding to each segment of the geometric variations of the reproduced information signal or output of the photodetector and extracting selectively the level of the tracking error signal whenever the detected duration is measured within a predetermined time range so as to produce a modified tracking error signal having the extracted level, and control means for performing tracking control in relation to the reading light beam in response to the modified tracking error signal.
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公开(公告)号：DE3324738A1
公开(公告)日：1984-01-12
申请号：DE3324738
申请日：1983-07-08
Applicant: SONY CORP
Inventor： KUWABARA SHINICHIRO , OHSATO KIYOSHI , SUGIKI MIKIO
Abstract: In an optical disc player in which a reading light beam is caused to impinge on an optical disc having a record track formed with an alignment of geometric variations such as a plurality of pits provided in response to information to be modulated in intensity by the record track and a photodetector is provided for detecting the reading light beam coming from the optical disc to generate an output varying in response to the variations in intensity of the detected reading light beam; there are provided a first circuit for producing a reproduced information signal having level variations representing the geometric variations and a tracking error signal which may have level variations depending on the size of each segment of the geometric variations on the strength of the output of the photodetector, a second circuit for detecting the duration of a portion corresponding to each segment of the geometric variations of the reproduced information signal or output of the photodetector and extracting selectively the level of the tracking error signal whenever the detected duration is measured within a predetermined time range so as to produce a modified tracking error signal having the extracted level, and a control circuit for performing tracking control in relation to the reading light beam in response to the modified tracking error signal.
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公开(公告)号：AT336735T
公开(公告)日：2006-09-15
申请号：AT97402530
申请日：1997-10-24
Applicant: SONY CORP
Inventor： YAMAMOTO KENJI , ICHIMURA ISAO , MAEDA FUMISADA , WATANABE TOSHIO , OHSATO KIYOSHI
Abstract: An objective lens having a doublet structure and a numerical aperture of 0.7 or more and an optical pickup apparatus having this objective lens are adapted to an optical recording medium having a high information recording density, the objective lens being structured such that at least one side is formed into a aspheric surface and the lens elements (3, 4) are made of low-diffusion glass having an Abbe's number of 40 or greater.
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公开(公告)号：MY120346A
公开(公告)日：2005-10-31
申请号：MYPI9804445
申请日：1998-09-26
Applicant: SONY CORP
Inventor： MAEDA FUMISADA , ICHIMURA ISAO , YAMAMOTO KENJI , OHSATO KIYOSHI , WATANABE TOSHIO
IPC: G11B7/00 , G11B7/135 , G11B7/09 , G11B7/125 , G11B7/1372 , G11B7/1378 , G11B7/1392
Abstract: A RECORDING/REPRODUCING APPARATUS FOR AN OPTICAL RECORDING MEDIUM (2) IN WHICH A LASER LIGHT BEAM IS ILLUMINATED ON AN OPTICAL RECORDING MEDIUM (2) USING A DOUBLE-LENS TYPE OBJECTIVE LENS MADE UP OF AT LEAST A FIRST LENS (3) AND A SECOND LENS (4) TO RECORD AND/OR REPRODUCE THE INFORMATION. THE APPARATUS INCLUDES A FIRST LENS (3) FOR CONVERGING THE LASER LIGHT ILLUMINATED FROM A LIGHT SOURCE, A SECOND LENS (4) ARRANGED BETWEEN THE FIRST LENS AND THE OPTICAL RECORDING MEDIUM (2) AND A VOICE COIL MOTOR FOR CAUSING RELATIVE MOVEMENT OF THE FIRST AND SECOND LENSES (3,4) FOR VARYING THE DISTANCE THEREBETWEEN IN THE DIRECTION ALONG THE OPTICAL AXIS. THE FIRST LENS (3) IS MOVED TO VARY THE DISTANCE BETWEEN THE FIRST AND SECOND LENSES. THIS ENLARGES THE NUMERICAL APERTURE AND DIMINISHES THE EFFECT OF ABERRATION TO ENABLE HIGH-DENSITY RECORDING AND/OR REPRODUCTION OF INFORMATION SIGNALS TO A HIGH RECORDING DENSITY. (FIGURE 2)
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公开(公告)号：DE69609902D1
公开(公告)日：2000-09-28
申请号：DE69609902
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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