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公开(公告)号：DE3884093T2
公开(公告)日：1994-04-21
申请号：DE3884093
申请日：1988-07-25
Applicant: SONY CORP
Inventor： YOSHITOSHI YOU , KUME HIDEHIRO , MATSUMOTO YOSHIYUKI , MITSUMORI KOJI , YAMAMOTO ETSUFUMI , OINOUE HIROSHI
Abstract: A focusing error detecting apparatus having a first photo-detector (7a) of which the light receiving portion is halved to provide first (7a4) and second (7a5) light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the first photo-detector (7a) being located in the optical path ahead of the focusing point of the bundle of the incident laser beams, a second photo-detector (7b) of which the light receiving portion is halved to provide first (7b4) and second (7b5) light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the second photo-detector (7b) being located in the optical path behind a focussing point of the bundle of the incident laser beams and a calculating circuit (3) for calculating a difference between a difference of detected outputs from the first and second light receiving portions of the first photo-detector and a difference of detected outputs from the first and second light receiving portions of the second photo-detector, thereby to derive a focusing error signal from the output of the calculating circuit (3).
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公开(公告)号：CA1325273C
公开(公告)日：1993-12-14
申请号：CA601193
申请日：1989-05-30
Applicant: SONY CORP
Inventor： KUME HIDEHIRO
Abstract: An optical head device for use in recording and/or reproduction of information comprises a light beam generating portion, a lens element for causing a light beam obtained from the light beam generating portion to impinge upon a record medium and receiving the light beam from the recording medium, and a photodetecting portion to which the light beam from the record medium received by the lens element is guided and which has three photosensitive elements separated from each other by a couple of parallel dividing portions and disposed to form a common light receiving plane on which a beam spot is formed by the light beam guided to the photodetecting portion for detecting the light beam guided to the photodetecting portion to produce respective detection output signals from which a tracking error signal is produced, wherein each of the parallel dividing portions extends along a direction selected to be at an angle within an angle range of 0 to 90 degrees to a direction of movement of a diffraction pattern appearing in the beam spot formed on the common light receiving plane in accordance with a record track in the record medium.
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公开(公告)号：CA2002381A1
公开(公告)日：1990-05-22
申请号：CA2002381
申请日：1989-11-07
Applicant: SONY CORP
Inventor： KUME HIDEHIRO , YAMAMOTO ETSUFUMI , MATSUMOTO YOSHIYUKI
Abstract: An optical pick-up device for a recording and/or reproducing apparatus in which a light beam (31) from a semiconductor laser element (14) is converged by an objective lens (1) and irradiated on recording tracks (tR) of an optical disc (101) and the light reflected by the disc (101) is sensed to read and/or record data signals, includes photosensors (17, 18) each having an insensitive central zone (17b, 18b) and arranged to receive the reflected light to generate tracking error signals (TE). The semiconductor laser element (14) is so arranged that the light beam (31) is projected on the disc (101) so that the meridional plane of the light beam (31) extending orthogonal to the junction plane of semiconductor layers of the semiconductor laser element (14) is at such an angle with respect to a tangential line drawn to one of the recording tracks (tR) of the disc (101) that non-symmetries on both sides of the tangential line as a function of the de-focusing direction of the beam spot are compensated.
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4.发明公开LIGHT-EMITTING/RECEIVING COMBINED UNIT AND DISPLACEMENT SENSOR USING THE SAME 有权组合的光发射/接收单元和该用途SANTANDER换档传感器
公开(公告)号：EP1286139A4
公开(公告)日：2004-10-27
申请号：EP02710467
申请日：2002-02-01
Applicant: SONY CORP , SONY PREC TECHNOLOGY INC
Inventor： KUME HIDEHIRO , NAKAYAMA AKIHITO , TANIGUCHI KAYOKO , KURODA AKIHIRO
CPC classification number: G01D5/38
Abstract: A light-emitting/receiving combined unit (1) comprises a light source (3), an optical demultiplexer (4) for demultiplexing a returning beam of light returning to the unit into multiple beams, a polarizing section (5) for varying the intensity of transmitted light depending on the polarized state of the returning light, and a light-receiving section (6) including optical sensors (6_1 to 6_4) for sensing the light beams transmitted through the polarizing section (5), all packaged into an integral structure. A grating-interference displacement sensor, serving as an external optical system (ET) for the unit (1), comprises an object of the measurement including a reflection diffraction-grating (RG), reflecting members (R1a, R1b) for reflecting the light outputted from the unit (1) toward the reflection diffraction-grating (RG), polarizing members (WP1a, WP1b) for receiving the light diffracted by the reflection diffraction-grating (RG) and changing the polarized state of the diffracted light, and reflecting members (R2a, R2b) for reflecting the light that has passed the polarizing members and returning the light in the opposite direction.
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公开(公告)号：DE3887026T2
公开(公告)日：1994-07-28
申请号：DE3887026
申请日：1988-07-25
Applicant: SONY CORP
Inventor： YOSHITOSHI YOU , MATSUMOTO YOSHIYUKI , KUME HIDEHIRO , MITSUMORI KOJI , YAMAMOTO ETSUFUMI , OINOUE HIROSHI
Abstract: An optical pickup device having a semiconductor laser element (5) mounted on a substrate (2), a photo detector (3) formed on the substrate to receive a laser beam emitted from the semi-conductor laser element (2) and an optical element (6) mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam. The optical element (6) is adapted to reduce the amount of unwanted stray light from the laser (5) reaching the photo detector (3). The rear face (6f) of the element (6) is coated with light absorption material (14) to substantially prevent said incident light from being reflected into the photo detector (3). The light absorption material (14) is chosen to absorb light of the wavelength(s) emitted by the laser element. The material (14) preferably has the same refractive index as the element (6).
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Patent Agency Ranking
公开(公告)号：CA1326546C
公开(公告)日：1994-01-25
申请号：CA614288
申请日：1989-09-28
Applicant: SONY CORP
Inventor： KUME HIDEHIRO , YAMAMOTO ETSUFUMI , NAGASHIMA KENJI
Abstract: An optical pickup device is disclosed in which a light beam from a laser light source is converged by an object lens on a signal recording surface of an optical disk to follow recording tracks formed on the signal recording surface to read out or write data on or from the signal recording surface. A semiconductor laser unit is used as a laser light source and is so arranged that the meridional plane of the light beam emanating from the semiconductor laser unit is inclined 30.degree. to 60.degree. with respect to the tangential direction of the recording track.
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公开(公告)号：DE3884093D1
公开(公告)日：1993-10-21
申请号：DE3884093
申请日：1988-07-25
Applicant: SONY CORP
Inventor： YOSHITOSHI YOU , KUME HIDEHIRO , MATSUMOTO YOSHIYUKI , MITSUMORI KOJI , YAMAMOTO ETSUFUMI , OINOUE HIROSHI
Abstract: A focusing error detecting apparatus having a first photo-detector (7a) of which the light receiving portion is halved to provide first (7a4) and second (7a5) light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the first photo-detector (7a) being located in the optical path ahead of the focusing point of the bundle of the incident laser beams, a second photo-detector (7b) of which the light receiving portion is halved to provide first (7b4) and second (7b5) light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the second photo-detector (7b) being located in the optical path behind a focussing point of the bundle of the incident laser beams and a calculating circuit (3) for calculating a difference between a difference of detected outputs from the first and second light receiving portions of the first photo-detector and a difference of detected outputs from the first and second light receiving portions of the second photo-detector, thereby to derive a focusing error signal from the output of the calculating circuit (3).
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公开(公告)号：DE3855780D1
公开(公告)日：1997-03-13
申请号：DE3855780
申请日：1988-07-25
Applicant: SONY CORP
Inventor： YOSHITOSHI YOU , MATSUMOTO YOSHIYUKI , KUME HIDEHIRO , MITSUMORI KOJI , YAMAMOTO ETSUFUMI , OINOUE HIROSHI
Abstract: An optical pickup device having a semiconductor laser element (5) mounted on a substrate (2), a photo detector (3) formed on the substrate to receive a laser beam emitted from the semi-conductor laser element (2) and an optical element (6) mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam. The optical element (6) is adapted to reduce the amount of unwanted stray light from the laser (5) reaching the photo detector (3). The rear face (6f) of the element (6) is coated with light absorption material (14) to substantially prevent said incident light from being reflected into the photo detector (3). The light absorption material (14) is chosen to absorb light of the wavelength(s) emitted by the laser element. The material (14) preferably has the same refractive index as the element (6).
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公开(公告)号：MY107051A
公开(公告)日：1995-09-30
申请号：MYPI19901581
申请日：1990-09-13
Applicant: SONY CORP
Inventor： TOMOYUKI ISHIDA , MITSUMORI KOJI , KUME HIDEHIRO
Abstract: AN OBJECTIVE LENS DRIVING DEVICE FOR AN OPTICAL PICK-UP COMPRISES A SUPPORTING MEMBER (12) TO WHICH AN OBJECTIVE LENS (11) IS ATTACHED, THE SUPPORTING MEMBER (12) BEING FREELY TRANSLATED IN THE DIRECTION PARALLEL TO THE OPTICAL AXIS DIRECTION OF THE OBJECTIVE LENS (11) AND IN THE PLANE DIRECTION PERPENDICULAR TO THE OPTICAL AXIS DIRECTION, A STATIONARY PORTION (14) TO WHICH THE SUPPORTING MEMBER (12) IS ATTACHED, A MAGNETIC CIRCUIT (15) PROVIDED ON THE SUPPORTING MEMBER (12) TO FORM A CLOSED MAGNETIC PATH, A FOCUSING COIL (20) FOR DRIVING THE OBJECTIVE LENS (11) IN COOPERATION WITH THE MAGNETIC CIRCUIT (15) SO THAT THE OBJECTIVE LENS (11) IS TRANSLATED PARALLEL TO THE OPTICAL AXIS DIRECTION OF THE OBJECTIVE LENS (11) AND PERPENDICULAR TO THE OPTICAL AXIS DIRECTION AND A PLURALITY TO TRACKING COILS (21) ATTACHED TO THE FOCUSING COIL (20), WHEREIN THE FOCUSING COIL (20) AND THE TRACKING COILS (21) ARE MOUNTED ON THE STATIONARY PORTION (14) SO AS TO OPPOSE THE MAGNETIC CIRCUIT (15) WITH A PREDETERMINED SPACING THEREBETWEEN.(FIG 2)
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公开(公告)号：DE69019277T2
公开(公告)日：1995-09-14
申请号：DE69019277
申请日：1990-09-07
Applicant: SONY CORP
Inventor： KUME HIDEHIRO , MITSUMORI KOJI , ISHIDA TOMOYUKI
Abstract: An objective lens driving device for an optical pick-up comprises a supporting member (12) to which an objective lens (11) is attached, the supporting member (12) being freely translated in the direction parallel to the optical axis direction of the objective lens (11) and in the plane direction perpendicular to the optical axis direction, a stationary portion (14) to which the supporting member (12) is attached, a magnetic circuit (15) provided on the supporting member (12) to form a closed magnetic path, a focusing coil (20) for driving the objective lens (11) in cooperation with the magnetic circuit (15) so that the objective lens (11) is translated parallel to the optical axis direction of the objective lens (11) and perpendicular to the optical axis direction and a plurality of tracking coils (21) attached to the focusing coil (20), wherein the focusing coil (20) and the tracking coils (21) are mounted on the stationary portion (14) so as to oppose the magnetic circuit (15) with a predetermined spacing therebetween.
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