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公开(公告)号：DE69329945T2
公开(公告)日：2001-06-07
申请号：DE69329945
申请日：1993-07-13
Applicant: SEIKO EPSON CORP
Inventor： TAKEKOSHI TARO , YONEKUBO MASATOSHI , TAKEDA TAKASHI , ARIMURA TOSHIO
Abstract: A plurality of slant faces (1419) are formed on a substrate (1406). A polarized optical thin film is formed on the slant faces. The recess defined by the slant faces (1419) is filled with transparent material to form a small composite polarizing element. By this polarizing element, it is possible to detect magneto-optic signals excellent in transmissivity and extinction ratio and high in S/N ratio. Also, this polarizing element serves as the cover of the package (1408) of an optical head which houses a photodetecting element (1409) and a light emitting element (1411) integrally. Also, by use of an optical element having an optical path length adjustment function of varying the optical path length of the outgoing light beam from that of the incoming light beam, it is possible to eliminate the initial offset of the focal point error signals and to omit the adjustment at the same time. In this way, a small, simple and high-performance optical head used for magneto-optic recording and reproducing apparatus can be realized.
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公开(公告)号：DE69329945D1
公开(公告)日：2001-03-29
申请号：DE69329945
申请日：1993-07-13
Applicant: SEIKO EPSON CORP
Inventor： TAKEKOSHI TARO , YONEKUBO MASATOSHI , TAKEDA TAKASHI , ARIMURA TOSHIO
Abstract: A plurality of slant faces (1419) are formed on a substrate (1406). A polarized optical thin film is formed on the slant faces. The recess defined by the slant faces (1419) is filled with transparent material to form a small composite polarizing element. By this polarizing element, it is possible to detect magneto-optic signals excellent in transmissivity and extinction ratio and high in S/N ratio. Also, this polarizing element serves as the cover of the package (1408) of an optical head which houses a photodetecting element (1409) and a light emitting element (1411) integrally. Also, by use of an optical element having an optical path length adjustment function of varying the optical path length of the outgoing light beam from that of the incoming light beam, it is possible to eliminate the initial offset of the focal point error signals and to omit the adjustment at the same time. In this way, a small, simple and high-performance optical head used for magneto-optic recording and reproducing apparatus can be realized.
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公开(公告)号：FR2597643A1
公开(公告)日：1987-10-23
申请号：FR8614967
申请日：1986-10-28
Applicant: SEIKO EPSON CORP
Inventor： KOGURE SHIGERU , YONEKUBO MASATOSHI
IPC: G11B11/105 , G11B7/08
Abstract: A magneto-optical signal read-out system for a magneto-optical player in which the polarized plane of linearly polarized incident light is rotated when the incident light is reflected by or passes through a magneto-optical medium having tracks thereon and the rotation angle of the polarized plane is utilized as an information signal. The read-out system includes a first analyzer, a second analyzer and a photo detector divided into first and second photo detector sections. A differential amplifier receives output signals from the first and second photo detector sections and produces a detected signal representative of the difference between the first and second output signals to reduce in-phase noise in the detected signal.
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公开(公告)号：GB2182787A
公开(公告)日：1987-05-20
申请号：GB8626284
申请日：1986-11-04
Applicant: SEIKO EPSON CORP
Inventor： YONEKUBO MASATOSHI
Abstract: An apparatus for reading data to and from a moving magneto-optical recording medium includes a carriage which is moved across data tracks contained in the medium. Optics for focusing a spot of light on the medium and a mechanism for fine tracking of the spot on a selected track are carried on the carriage and are movable independently of the carriage in response to separately amplified servo signals which are derived from light which is reflected from the spot of light on the data-containing track.
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公开(公告)号：AT381441T
公开(公告)日：2008-01-15
申请号：AT03004944
申请日：2003-03-10
Applicant: SEIKO EPSON CORP
Inventor： SEKI HIDEYA , YONEKUBO MASATOSHI
IPC: B41J2/45
Abstract: The present invention relates to a small optical writing head, such as an organic EL array exposure head, having long work distance with little crosstalk, a method of manufacturing the same, and an image forming apparatus using the same. The optical writing head is an optical writing head which projects fluxes of modulated light from light-emitting parts 2 of a light-emitting element array such as an organic EL array or fluxes of modulated light transmitted through shutter parts 2 of an optical shutter element array onto an image carrier 11 to form a predetermined pattern on the image carrier 11. The optical writing head comprises ball lenses 10 which are arranged such that the alignment of the ball lenses 10 corresponds to the alignment of the light-emitting parts 2 of the light-emitting element array or the shutter parts 2 of the optical shutter element array.
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Patent Agency Ranking
公开(公告)号：SG109576A1
公开(公告)日：2005-03-30
申请号：SG200404700
申请日：2004-08-17
Applicant: SEIKO EPSON CORP
Inventor： YAMAZAKI TETSURO , YONEKUBO MASATOSHI , TAKEDA TAKASHI
Abstract: An optically controlled device includes a transparent electrode (202), a conductivity variable portion (203), a driving electrode (204), a movable unit (108), and a support portion (206). A method of controlling the optically controlled device includes inputting a control light into the transparent electrode, applying a voltage between the transparent electrode and the movable unit modulating either the intensity of the control light or the voltage according to an input signal, and moving the movable unit to a predetermined position by generating a force proportional to the voltage between the driving electrode and the movable unit based on a change of electrical conductivity of the conductivity variable portion.
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公开(公告)号：DE69326213D1
公开(公告)日：1999-10-07
申请号：DE69326213
申请日：1993-11-16
Applicant: SEIKO EPSON CORP
Inventor： SEKI HIDEYA , YONEKUBO MASATOSHI , ARIMURA TOSHIO , TAKEDA TAKASHI
Abstract: A laser beam emitted from the laser emission unit (20) is emitted through an objective lens (12) and focused on an optical medium. A reflected beam from the optical medium is returned through the objective lens and a diffraction grating (11) to a signal detection circuit (34) in the laser emission unit. Hitherto, many operating functions have been provided in the optical head (1). However, the present invention provides the laser emission unit in a lens holder (10) and with a plurality functions in the emission unit itself and so the space in the optical head can be reduced. Moreover, the space for the light path both emitted and received is also decreased. Thus, the size of the optical head is extremely reduced and since the optical head can be assembled by a smaller number of parts, the production costs can be decreased.
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公开(公告)号：HK1007034A1
公开(公告)日：1999-03-26
申请号：HK98106227
申请日：1998-06-23
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU , YONEKUBO MASATOSHI , IWANO HIDEAKI , SAKATA HIDEFUMI , TAKEDA TAKASHI , SEKI TETSUYA , KOGURE SHIGERU
Abstract: A small and inexpensive optical head for detecting a recorded signal, a focusing error signal and a tracking error signal, and an optical memory device utilizing the optical head. A diffraction device (103) is provided having two chirped grating regions (103A, 103B) for dividing a light beam from an optical recording medium (105) and directing the divided beams toward four band-shaped photoelectric transducers (106) and an astigmatism generator formed by the diffraction means (103) and a positive lens (102). The four photoelectric transducers are positioned in a plane inclined with respect to the optical axis of zero-order diffraction light, and the longitudinal axes of each of the band-shaped photoelectric transducers are radially arranged relative to the optical axis.
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公开(公告)号：DE69119658T2
公开(公告)日：1997-01-09
申请号：DE69119658
申请日：1991-07-10
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU , YONEKUBO MASATOSHI , IWANO HIDEAKI , SAKATA HIDEFUMI , TAKEDA TAKASHI , SEKI TETSUYA , KOGURE SHIGERU
Abstract: A small and inexpensive optical head for detecting a recorded signal, a focusing error signal and a tracking error signal, and an optical memory device utilizing the optical head. A diffraction device (103) is provided having two chirped grating regions (103A, 103B) for dividing a light beam from an optical recording medium (105) and directing the divided beams toward four band-shaped photoelectric transducers (106) and an astigmatism generator formed by the diffraction means (103) and a positive lens (102). The four photoelectric transducers are positioned in a plane inclined with respect to the optical axis of zero-order diffraction light, and the longitudinal axes of each of the band-shaped photoelectric transducers are radially arranged relative to the optical axis.
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公开(公告)号：HK28591A
公开(公告)日：1991-04-26
申请号：HK28591
申请日：1991-04-18
Applicant: SEIKO EPSON CORP
Inventor： YONEKUBO MASATOSHI
Abstract: An apparatus for reading data to and from a moving magneto-optical recording medium includes a carriage which is moved across data tracks contained in the medium. Optics for focusing a spot of light on the medium and a mechanism for fine tracking of the spot on a selected track are carried on the carriage and are movable independently of the carriage in response to separately amplified servo signals which are derived from light which is reflected from the spot of light on the data-containing track.
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