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    1.
    发明专利
    未知

    公开(公告)号：IT1169006B

    公开(公告)日：1987-05-20

    申请号：IT1901981

    申请日：1981-01-06

    Applicant: PHILIPS NV

    Inventor： DE HAAN MAARTEN RUTGER ,  COMPAAN KLAAS ,  HISSEL LEOPOLD HEINRICH

    IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B19/28 ,  G11B20/14 ,  G11B

    Abstract: Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.

    4.
    发明专利
    未知

    公开(公告)号：DD157230A5

    公开(公告)日：1982-10-20

    申请号：DD22685181

    申请日：1981-01-06

    Applicant: PHILIPS NV

    Inventor： DE HAAN MAARTEN R ,  COMPAAN KLAAS ,  HISSEL LEOPOLD H

    IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B19/28 ,  G11B20/14

    Abstract: Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.

    OPTICAL FOCUSSING-ERROR DETECTION ARRAY
    6.
    发明专利
    OPTICAL FOCUSSING-ERROR DETECTION ARRAY 未知

    公开(公告)号：CA1189618A

    公开(公告)日：1985-06-25

    申请号：CA417320

    申请日：1982-12-09

    Applicant: PHILIPS NV

    Inventor： COMPAAN KLAAS

    IPC: G02B7/28 ,  G11B7/09 ,  G11B7/00 ,  H04N5/76

    Abstract: 14 Optical focusing-error detection device, An optical focusing error-detection device is described which comprises a radiation sensitive detector which comprises four sub-detectors, and an astigmatic lens system arranged between the detector and the objective system whose focusing error is to be detected. If the astigmatic system comprises two cylindrical lenses having mutually perpendicular axes and having different powers, which lenses are arranged in a non-collimated beam, the resulting focusing-error signal will be linear around the zero point and will also be symmetrical.

    OPTICALLY READABLE DIGITAL INFORMATION DISC AND RECORDING AND REPRODUCING APPARATUS THEREFOR
    7.
    发明专利
    OPTICALLY READABLE DIGITAL INFORMATION DISC AND RECORDING AND REPRODUCING APPARATUS THEREFOR 未知

    公开(公告)号：AU535687B2

    公开(公告)日：1984-03-29

    申请号：AU6599181

    申请日：1981-01-06

    Applicant: PHILIPS NV

    Inventor： HAAN MAARTEN RUTGER DE ,  COMPAAN KLAAS ,  HISSEL LEOPOLD HEINRICH

    IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B19/28 ,  G11B20/14

    Abstract: Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.

    9.
    发明专利
    未知

    公开(公告)号：IT8119019D0

    公开(公告)日：1981-01-06

    申请号：IT1901981

    申请日：1981-01-06

    Applicant: PHILIPS NV

    Inventor： HAAN MAARTEN RUTGER DE ,  COMPAAN KLAAS ,  HISSEL LEOPOLD HEINRICH

    IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B19/28 ,  G11B20/14 ,  G11B

    Abstract: Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.

    10.
    发明专利
    未知

    公开(公告)号：DE3006833A1

    公开(公告)日：1980-09-04

    申请号：DE3006833

    申请日：1980-02-23

    Applicant: PHILIPS NV

    Inventor： ROOS JAN ,  COMPAAN KLAAS ,  KASTEREN ADRIANUS CORNELIUS VA

    IPC: H04N5/253 ,  H04N3/36 ,  H04N3/38 ,  H04N9/11

    Abstract: An apparatus is described for converting cinematographic images into video signals. The film gate in which a frame to be scanned is located is illuminated uniformly. The film is scanned by means of a rotatable scanning mirror, which with the aid of an imaging system images one line of the film frame onto one row (three rows for color film) of radiation sensitive detectors. The detectors of a row are read sequentially. The illumination beam has a large aperture angle in a first plane transverse to the direction of film transport and a small aperture angle in a plane transverse to the first plane. The film movement is detected with the aid of a sprocket hole detection system, in which an elongate narrow light spot, whose longitudinal direction is transverse to the direction of film transport, is projected onto the strip of film with the sprocket holes. The position of the scanning mirror is detected with the aid of two gratings of special shape.

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