Accession Number : ADD013457

Title :   Rotating Shutter System for Improving the Resolution of a Visual Display System.

Descriptive Note : Patent, Filed 11 Dec 80, patented 25 Jan 83,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Baldwin, Dorothy M ; Oharek, Frank J ; Stahl, Curt

Report Date : 25 Jan 1983

Pagination or Media Count : 10

Abstract : This invention, in general, relates to closed cikrcuit television type simulation devices. In particular, this invention relates to a rotating shutter system for improving the resolution of an annular probe of a visual display system. The s ubject invention overcomes the smearing of the visual scene projected by the 360 deg. non-programmed visual display system in that it comprises a relatively simple rotating shutter system to be utilized within the annular probe of the display system so as to increase the resolution thereof by a factor of two. Included within the rotating shutter system is a rotating shutter having a plurality of evenly spaced opaque radial lines on one surface thereof, a direct current motor for rotating the shutter at a predetermined speed, and a light emitting diode transmitter for broadcasting through the shutter a light beam such that the light beam will be broken by the opaque radial lines of the rotating shutter at a frequency corresponding to the rotational speed of the shutter. A light emitting diode receiver senses the broken light beam, and supplies to a feedback circuit a shutter error signal which has a frequency proportional to the frequency of the broken light beam. The feedback circuit then synchronizes the frequency of the shutter error signal with the frequency of a reference signal generated thereby so as to provide at the output thereof a motor control signala to drive the direct current motor at a constant speed.

Descriptors :   *DISPLAY SYSTEMS, *SHUTTERS(OPTICS), CIRCUITS, CONTROL, DIRECT CURRENT, ERRORS, FEEDBACK, INVENTIONS, LIGHT, LIGHT EMITTING DIODES, MOTORS, PROBES, ROTATION, SIGNALS, SURFACES, TRANSMITTERS, VELOCITY, VISION, VISUAL AIDS, PATENTS

Subject Categories : Optics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE