| 摘要 |
Systems embodying the invention include an arm having a polished mirror-like surface located on the arm. The arm includes means for mounting the arm on a shaft (or spindle) to allow the arm to rotate freely in the lateral direction (perpendicular to the length of arm). The arm is intended for use in a system which includes means for directing a beam of light onto the mirror-like surface whereby when the mirror-like surface is rotated (e.g., by Beta degrees) the beam of light reflected from the mirror-like surface is swept through a proportionate number of (e.g., 2 Beta) degrees. An electrically controllable system is coupled to the arm causing the arm to move in one direction and then in the opposite direction whereby the arm is caused to vibrate (oscillate) back and forth. In a preferred embodiment the mirror is located at one end of the arm while the other end of the arm is part of an electrically controllable magnetic system which includes a coil and means for selectively passing a current in a first sense through the coil to cause the arm to move in one direction and then for passing a current in the opposite sense through the coil to cause the arm to move in the opposite direction whereby the arm is caused to vibrate (oscillate) back and forth.
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