• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU1382410A3
    申请号:SU823408415
    申请日:1982-03-23
    公开日:1988-03-15
    发明作者:Лакотт Жан-Пьер；Фишо Бернар；Труд Жиль
    申请人:Томсон-Цсф (Фирма)；
    IPC主号:
    专利说明:

    one
    The invention relates to instrumentation, in particular to optical sensors, generating focusing error signals, which are used to control the movement of the optical system, which leads to its correct focusing.
    The aim of the invention is to simplify the device.
    Figure 1 shows the optical layout of the sensor proposed; figure 2 - diagram of the system for receiving signals and their processing.
    The radiation source 1 is predominantly a laser that forms a parallel beam, which is focused by the lens 2 at the point S V. The diverging beam after point S falls on the prism 3.
    Part of the beam is reflected by the AB face and falls on the focusing lens 4, which forms the image of point S at point Sn. For a good match, it is necessary that the point S be on the storage plane P, since this will cause the beam to be autocollimated. This part of the beam is reflected by the face of prism AB and can be further used.
    A part of the beam reflected by the carrier enters the prism 3 through the edge AB and exits through the edge AS. The beam emerging from the prism is astigmatic, i.e. has two different focusing planes t and S, respectively, in the meridional and saggital planes. Equal distance from these two planes is the plane T, which is the plane
    824102
    the circle of smallest diffusion, with etbm, this plane is perpendicular to the optical axis.
    When point 5 hits, the focusing on the PJ plane does not cause autocollimation, and the light spot on the T plane will be deformed.
    Q Figure 2 schematically depicts a device for automatic control, including a receiver of quadratic cells 5, 6, 7 and 8, adjacent to each other, forming
    The 15 square, the diagonal 9 of which is in the plane of the main section of the prism 3. When the lens 4 is precisely focused on the storage area, the light spot 10 has the shape
    20 laps.
    When the lens is defocused 4, the spot 10 is lengthened along one of the diagonals, depending on whether the point S is in front or
    25 behind the storage plane.
    The signals terminated by the opposite cells 5 and 7 are summarized in circuit 11, and the signals from circuit 6 and 8 in circuit 12.
    30 Output signals of circuits 11 and 12
    arrive at the differential amplifier 13, generating a correction signal S.
    The magnitude of this signal can be
    registered with measuring unit 14 and, finally, the signal goes to the motor controlling the movement of the lens 4, in two opposite directions depending on the sign S.
    FIG.
    权利要求:
    Claims (2)
    [1]
    1. OPTICAL SENSOR WITH AUTOMATIC LENS CONTROL SYSTEM, containing a illuminator, an element behind which a sensor is arranged in the plane of the best focusing, made in the form of a four-square receiver included in a circuit containing two signal adders, the corresponding inputs of which are connected to the corresponding outputs of each pair of diagonally located receivers, and their outputs are connected to the inputs of a differential amplifier connected to a lens moving motor, characterized in that, in order to simplify Ia, the beam splitting means into two channels and the astigmatic element is formed in one piece - <g beam splitting means into two channels, one of which is mounted a lens focusing a beam projected on the reflecting Infor- mation carrier • prism.
    The optical sensor with I made in the form of claim 1, in that
    511 ,,,, 1382410 AZ
    [2]
    2.
    distinguishing storage medium
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1382410A3|1988-03-15|Optical sensor with objective lens automatic control system
    EP0084703A2|1983-08-03|Partial beam focus sensing device
    JPS5752005A|1982-03-27|Focus detecting method
    JPS5598709A|1980-07-28|Focusing detector
    JPH02149933A|1990-06-08|Focus controller
    JPS5746334A|1982-03-16|Optical information reproducer
    JPS57105832A|1982-07-01|Detector for optical position
    JPS56133704A|1981-10-20|Focus error detector
    JPS6225716A|1987-02-03|Deviation detecting device for correlation image
    JPH07182666A|1995-07-21|Light pickup system
    KR880004297Y1|1988-11-30|Optical sensor for focusing control
    JPS5942646A|1984-03-09|Radial skew correcting device of disk device
    JPS57113342A|1982-07-14|Eccentricity measurement
    JPS5845629A|1983-03-16|Condensing device having focal error signal detecting function
    JPS644927A|1989-01-10|Automatic focusing system
    JPS63263635A|1988-10-31|Optical pickup device
    JPS5933643A|1984-02-23|Optical pickup
    JPS6275411A|1987-04-07|Non-contacting automatic positioning device
    JPS62232728A|1987-10-13|Focus position detecting device
    JPS5973707A|1984-04-26|Optical position detecting method
    JPS61148632A|1986-07-07|Focus control signal detecting system of optical disk device
    JPS63213827A|1988-09-06|Focus detector
    JPS5848233A|1983-03-22|Optical information reader
    JPS58147668A|1983-09-02|Optical tracking device
    JPS61129743A|1986-06-17|Focus detector of optical pickup
    同族专利:
    公开号 | 公开日
    FR2502800B1|1985-04-26|
    EP0061384B1|1984-10-17|
    DE3260984D1|1984-11-22|
    CA1195775A|1985-10-22|
    HK83989A|1989-10-27|
    KR830009561A|1983-12-22|
    JPS57169934A|1982-10-19|
    US4482803A|1984-11-13|
    FR2502800A1|1982-10-01|
    EP0061384A1|1982-09-29|
    JPH0447377B2|1992-08-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2235448B1|1973-06-29|1976-05-07|Thomson Brandt|
    US4079247A|1975-05-16|1978-03-14|Claude Bricot|Optical focussing device|
    US3983317A|1974-12-09|1976-09-28|Teletype Corporation|Astigmatizer for laser recording and reproducing system|
    FR2313716B1|1975-06-03|1982-09-03|Thomson Brandt|
    FR2325987B1|1975-09-29|1979-04-06|Thomson Brandt|
    US4025949A|1975-12-31|1977-05-24|Zenith Radio Corporation|Symmetrical astigmatic focus sensing system|
    NL7907216A|1979-09-28|1981-03-31|Philips Nv|OPTICAL FOCUS ERROR DETECTION SYSTEM.|FR2523350B1|1982-03-09|1987-05-22|Thomson Csf|OPTICAL HEAD IN A RECORDING-READING DEVICE OF AN INFORMATION MEDIUM|
    DE3477296D1|1984-04-05|1989-04-20|Agfa Gevaert Nv|Device for accurately focussing a laser beam|
    CA1258906A|1985-04-22|1989-08-29|Hiroshi Oinoue|Semiconductor laser apparatus for optical head|
    JP2609221B2|1985-04-22|1997-05-14|ソニー株式会社|Semiconductor laser device|
    JP2612436B2|1985-10-15|1997-05-21|三菱電機株式会社|Automatic focusing device|
    US4778984A|1985-10-16|1988-10-18|Canon Denshi Kabushiki Kaisha|Apparatus for detecting focus from astigmatism|
    JPS62177734A|1986-01-31|1987-08-04|Nec Home Electronics Ltd|Optical head|
    US4954702A|1987-10-14|1990-09-04|Konica Corporation|Process for detecting a focal point in an optical head|
    JP2702178B2|1988-09-28|1998-01-21|三菱電機株式会社|Optical head device|
    CN100339681C|2004-09-02|2007-09-26|精碟科技股份有限公司|Optical disk detecting device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR8105854A|FR2502800B1|1981-03-24|1981-03-24|
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