Angular displacement

About: Angular displacement is a research topic. Over the lifetime, 5102 publications have been published within this topic receiving 46081 citations. The topic is also known as: rotational displacement.

Galvo position sensor for track selection in optical data disk system

Abstract: Disclosed is a radiant energy optoelectronic position monitor system which detects the angular position of a "galvanometer mirror" (beam scanner) used in an optical disk memory arrangement. Using a single infra-red monitor beam, angular motion is converted to linear displacement of an image on a detector cell so as to produce a corresponding electrical signal. This signal is presented to a processing circuit with an analog divider to normalize output scale factor. The result is a high gain electrical circuit for recovering output signals in an environment with strong magnetic interference.

Electrical switch having rotatable and pivotable lever

Abstract: An electrical switch wherein a body of the switch supports a rotor. A contact is movable with the rotor relative to first, second and third fixed contacts supported by the body. An operating lever extends from the body transverse to the rotor axis and is coupled to the rotor to transmit rotational movement of the lever about its longitudinal axis to move the rotor about its rotational axis. Annular movement of the lever about the rotor axis is also transmitted to move the rotor about its rotational axis. A first detent defines first, second and third predetermined rotational positions of the lever about the lever longitudinal axis. A second detent defines first and second predetermined angular positions of the lever about the rotor axis. The first, second and third fixed contacts, the spacing between the first, second and third rotated lever positions, and the first and second lever angular positions are so arranged that in the first, second and third lever rotational positions respectively, with the lever in its first angular position, the movable contact is respectively, clear of the fixed contacts, in engagement with the first fixed contact, and in engagement with the first and second fixed contacts. However, in the first, second and third lever rotational positions with the lever in its second angular position, the movable contact is respectively, clear of the fixed contacts, in engagement with the first and second fixed contacts, and in engagement with the first and third fixed contacts.

Method and apparatus for locating a point in a three-dimensional body using images of the body from a plurality of angular positions

Abstract: A set of two-dimensional views of a body are provided from successive azimuthal angles with respect to a given axis. The set of views of the body are successively displayed on a display screen which shows the body as rotating about an axis. A point of interest in the body also appears to rotate about the axis. That view at which the point of interest is maximally displaced from the apparent axis of rotation is used to determine the angular position of the point of interest. The true displacement of the point of interest from the axis of rotation and its true displacement along the axis of rotation are available from that view. Thus, the cylindrical coordinates of the point of interest are known. To check the accuracy with which the coordinates of the point of interest have been determined, a cursor is established in the stopped view, and the projection of the cursor in the other views is calculated in a conventional manner. While sequential display of the views continues, the cursor appears to move with but not relative to the point of interest if the cursor actually overlies the point of interest. If the cursor appears to move relative to the point of interest, the cursor is modified until no relative motion appears.

Distortion correction apparatus for electro-optical reflectors which scan beams to produce images

Abstract: Apparatus is disclosed for use with image forming apparatus having a pair of galvanometers one of which, in response to a ramp signal rotates a mirror which scans lines in one direction across the image and the other of which in response to a staircase signal rotates another mirror in a direction perpendicular to the direction of the lines to scan successive ones of the lines. The apparatus includes circuits responsive to the galvanometer drive signal amplitudes for producing a compensating signal which is representative of the angular displacement of the mirrors and thus of the position to which the beam is scanned at any instant. This compensating signal and the signal which drives the galvanometer which scans the beam between successive lines are combined to adjust the angular displacement of the mirror which scans the beam in the direction between the successive lines, thus correcting the geometric distortion of the pin cushion type of the image.