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    Tape winding apparatus for recording and/or reproducing of information on an endless tape
    61.
    发明授权
    Tape winding apparatus for recording and/or reproducing of information on an endless tape 失效
    用于记录和/或重现无限带的信息的卷带卷绕装置

    公开(公告)号：US3592402A

    公开(公告)日：1971-07-13

    申请号：US3592402D

    申请日：1968-04-22

    Applicant: AGA AB

    Inventor： WESTBERG JOHAN ERIC HAYDEN

    IPC: G11B15/43 ,  G11B15/66

    CPC classification number: G11B15/43 ,  G11B15/66

    Abstract: The invention relates to a tape-winding device for moving a tape in a single direction relative to means for recording and/or reproducing information on said tape. The tape is endless and increased tape-running time is provided by a pair of spool means. The tape is wound in a doubled-back or bifilar manner on a first spool. A first section of tape is fed therefrom to the information recording and/or reproducing means and from there to the second spool. The second section of tape is wound directly onto the second spool element. After the tape is entirely unwound from the first spool and onto the second spool in this manner, the spool directions are reversed and the second tape section is unwound from the second spool to the information recording and/or reproducing means and from there to the first spool. The first tape section is unwound directly from the second spool to the first spool and when the second spool is empty, the spool directions are again changed and a cycle begins as before. A tape-advancing means continuously drives the tape in one direction relative to the recording and/or reproducing means. When a spool becomes empty, the spools change direction and, at that time, a loop of tape must be fed into engagement from the full spool to the empty spool for winding thereon. According to the present invention, the tape loop is guided to the empty spool by an airstream. The airstream may also be used to change the direction of rotation of the spools.

    Arrangement for measuring relative displacement utilizing relatively movable shutters which control the passage of modulated light
    64.
    发明授权
    Arrangement for measuring relative displacement utilizing relatively movable shutters which control the passage of modulated light 失效
    用于测量相对位移的装置，利用可调节的可调节切换器来控制调制光的通过

    公开(公告)号：US3566140A

    公开(公告)日：1971-02-23

    申请号：US3566140D

    申请日：1969-03-26

    Applicant: AGA AB

    Inventor： GRANQVIST CARL-ERIK

    IPC: G02B6/00 ,  G01D5/347 ,  G01D5/36 ,  G02B6/04 ,  H01J39/12

    CPC classification number: G01D5/36

    Abstract: An apparatus for measuring the relative displacement of an object includes a stationary shutter and a movable shutter which control the light passing from a modulated light source to a light receiver. The movable shutter includes a plurality of secondary slots inclined relative to a primary slot in the stationary shutter so that light will pass through different portions of the primary slot depending on the position of the secondary slots relative thereto. The light receiver may comprise a plurality of photocells arranged relative to the primary slot such that the individual outputs thereof depend on the portion of the primary slot uncovered. The outputs of the photocells are each delayed by a different amount and are combined to produce a resultant signal whose phase is compared with the signal used to modulate the light source.

    Theodolite
    65.
    发明授权
    Theodolite 失效
    THEODOLITE

    公开(公告)号：US3560095A

    公开(公告)日：1971-02-02

    申请号：US3560095D

    申请日：1969-05-26

    Applicant: AGA AB

    Inventor： THORLIN CHARLES FREDRIK WILHEL

    IPC: A47C9/10 ,  G01C1/02 ,  G01C1/06 ,  G01B11/26

    CPC classification number: G01C1/02 ,  G01C1/06

    Abstract: IN A THEODOLITE, THE OPTICAL AXIS IS DEFLECTED BY A MIRROR ATTACHED TO A ROTATABLE DISK HAVING A CIRCUMFERENTIAL SCALE GRADUATED IN ANGLES. TO ELIMINATE ERRORS OF CENTRICALLY OF THE DISK AXIS RELATIVE TO THE SCALE, THE DISK IS REVERSIBLE ABOUT THE AXIS OF ROTATION AND THE MIRROR IS PROVIDED WITH A REFLECTIVE SURFACE ON THE REAR SIDE, SCALE MARKINGS BEING PROVIDED FOR READING OFF A VALUE 180* DIFFERENT FROM THAT CORRESPOND TO THE ORIGINAL POSITION.

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