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    Scan control for synchronizing a data signal with a clock signal
    3.
    发明授权
    Scan control for synchronizing a data signal with a clock signal 失效
    用于与时钟信号同步数据信号的扫描控制

    公开(公告)号：US3662364A

    公开(公告)日：1972-05-09

    申请号：US3662364D

    申请日：1969-12-22

    Applicant: IBM

    Inventor： PATEL ARVINDKUMAR M ,  WELLBROCK ANTON G

    IPC: G11B11/10 ,  G11B11/105 ,  G11B20/16 ,  G11C13/04

    CPC classification number: G11B11/10

    Abstract: A magneto-optic transducing system is utilized to convert a magnetic recording into electrical signals. For purposes of decoding the electrical signals into data, it is necessary that the electrical signal transduced from a magnetic recording be synchronized with a reference clock signal. Synchronization is obtained herein by fixing the frequency of the reference clock signal and varying the frequency of the data signal as transduced from the magnetic recording. The frequency and phase of the data signal are varied by varying the scanning sweep speed used in a magneto-optic transducer. Two alternative embodiments are shown. In the first embodiment, the scanning is accomplished by a vidicon which scans the magneto-optic image of a large block of data. In an alternative embodiment, a cathode ray tube is used as the light source for the magneto-optic transducer so that each bit may be separately scanned by deflecting the beam in the cathode ray tube. Synchronization is obtained by comparing the frequency and phase of the data signal from the transducing system with the frequency and phase of the reference clock and feeding back an error signal to the deflection coils of the cathode ray tube or the vidicon. The correction signal increases or decreases the sweep speed as is necessary to synchronize the data with the clock.

    Abstract translation: 磁光转换系统用于将磁记录转换为电信号。 为了将电信号解码为数据，必须将从磁记录转换的电信号与参考时钟信号同步。 这里通过固定参考时钟信号的频率并改变从磁记录传送的数据信号的频率来获得同步。 数据信号的频率和相位通过改变在磁光换能器中使用的扫描扫描速度来改变。 示出了两个替代实施例。 在第一实施例中，扫描是通过扫描大块数据的磁光图像的视频来完成的。 在替代实施例中，阴极射线管用作磁光变换器的光源，使得可以通过使阴极射线管中的光束偏转来单独扫描每个位。 通过将来自转换系统的数据信号的频率和相位与参考时钟的频率和相位进行比较并将误差信号反馈到阴极射线管或视频体的偏转线圈来获得同步。 校正信号使数据与时钟同步所需的扫描速度提高或降低。

    Variable digital light deflector
    4.
    发明授权
    Variable digital light deflector 失效
    可变数字光偏转器

    公开(公告)号：US3552825A

    公开(公告)日：1971-01-05

    申请号：US3552825D

    申请日：1969-03-28

    Applicant: IBM

    Inventor： WELLBROCK ANTON G

    IPC: G02B26/02 ,  G02F3/00

    CPC classification number: G02B26/02

    Abstract: VARIABLE DIGITAL LIGHT DEFLECTION IS OBTAINED BY STACKING LIGHT DEFLECTION PLATES ON THE HYPOTENUSE OF A RIGHT-ANGLE PRISM. LIGHT ENTERS ONE FACE OF THE PRISM AND STRIKES THE HYPOTENUSE OF THE PRISM AT AN ANGLE EQUAL TO OR GREATER THAN THE CRITICAL ANGLE. NORMALLY, THE LIGHT WILL BE TOTALLY INTERNALLY REFLECTED IN THE PRISM AND PASS OUT THE OTHER FACE OF THE PRISM. HOWEVER, IF A DEFLECTOR PLATE IS ATTACHED TO THE HYPOTENUSE OF THE PRISM AND IS MAKING OPTICAL CONTACT WITH THE HYPOTENUSE OF THE PRISM, THE TOTAL INTERNAL REFLECTION WILL BE FRUSTRATED, AND THE LIGHT BEAM WILL PASS INTO THE DEFLECTOR PLATE. THE DEFLECTOR PLATES MAY BE STACKED ONE ON TOP OF THE OTHER. THE PHENOMENON OF TOTAL INTERNAL REFLECTION AND FRUSTRATION OF TOTAL INTERNAL REFLECTION IS USED TO CONTROL HOW MANY DEFLECTOR PLATES THE LIGHT BEAM PASSES THROUGH BEFORE IT IS TOTALLY INTERNALLY REFLECTED AND MOVES BACK THROUGH THE DEFLECTOR PLATES, THE PRISM, AND OUT THE FACE OF THE PRISM. THE DEFLECTOR PLATES MAY BE SOLID GLASS PLATES OR LIQUID CELLS. THEY MAY BE ENERGIZED BY A PIEZOELECTRIC CRYSTAL TO FLEX AND THEREBY MAKE OR BREAK OPTICAL CONTACT.

    LIGHT DEFLECTOR SYSTEMS
    8.
    发明专利
    LIGHT DEFLECTOR SYSTEMS 未知

    公开(公告)号：CA922553A

    公开(公告)日：1973-03-13

    申请号：CA62894

    申请日：1969-09-24

    Applicant: IBM

    Inventor： WELLBROCK ANTON G ,  BATE GEOFFREY

    IPC: G02B26/00 ,  G02B26/02

    Abstract: 1279661 Light deflector INTERNATIONAL BUSINESS MACHINES CORP 5 Nov 1969 [15 Nov 1968] 54164/69 Heading G2J A light deflector for directing a light beam 14 along a path pre-selected from two available paths 14A, 14D comprises a light transmissive element 10 having a beam receiving surface 11 and a boundary surface 13 and a reflective cell 17 containing a light transmissive fluid 21 retained by a light transmissive wall member 8, displaceable towards and away from said boundary surface, the arrangement being that when the wall member is displaced from the surface total internal reflection of a beam takes places at the surface but when the wall member and boundary surface are in abutting relationship, this reflection is frustrated. Cell 17 is composed of materials having the same refractive index and the wall member is preferably a transparent plate 18. A reflective backing member 20 defines with the plate 18 a chamber wherein the transparent fluid is disposed such that in the arrangement shown a beam of light e.g. 14, 14C will travel between the elements and be reflected 14D from the front reflecting surface 22 of the backing member 20 or from its rear surface 23, when the reflective coating is absent. Movement of the cell into and out of co-operation with the element 10 is achieved by Piezo-electric or magnetostrictive devices and this serves to provide digital offset of the incident light-beam. Fig. 6 (not shown) shows a device which can provide a continuously variable offset of the incident light-beam (over a larger range), according to an actuator which has for this purpose an inter-connected reservoir of fluid to enable the volume of the cell to be varied. The deflector may also be combined Fig. 5 (not shown) with others, not necessarily in the same place to provide a system giving a series of offset light-beams for a single incident beam. The light transmissive element may be a right angle prism a non right angle prism, a curved body or a non-planar body. Reference has been Directed by the Comptroller to Specification 1215209.

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