Light scanning by interference grating and method
Abstract
Abstract IN PRODUCING A TIME SEQUENTIAL LINEAR SCAN, LIGHT IS PASSED THROUGH DEFLECTION GRATINGS ARRANGED ADJOINING ONE ANOTHER IN PARALLEL PLANES, EACH OF THE GRATINGS HAVING ITS LINES IN ORDERED SPACIAL RELATIONSHIP, PREFERABLY BEING DIVIDED INTO FOUR EQUAL SECTORS WITH THE LINES IN EACH SECTOR PARALLEL. THE GRATINGS ARE MOVED OPPOSITELY WHILE MAINTAINING A POSITION TO INTERCEPT A LIGHT BEAM. THE GRATINGS PREFERABLY ROTATE OPPOSITELY ON PARALLEL AXES. LIGHT IS PASSED THROUGH THE GRATINGS PREFERABLY NORMAL TO EACH OF THEM AND TRACES A LINEAR SCAN ON A VIEWING SCREEN PREFERABLY PLACED PARALLEL TO THE PLANES OF THE GRATINGS. MIRRORS BETWEEN THE GRATINGS DEFLECT THE INCIDENT LIGHT TO THE SECOND GRATING SO THAT IT IS NORMAL THERETO ON ENTERING. IN THE PREFERRED FORM THE SPACING BETWEEN THE GRATINGS IS APPROXIMATELY EQUAL TO THE SPACING BETWEEN THE VIEWING SCREEN AND THE NEAREST GRATING. IN THE PREFERRED EMBODIMENT EACH GRATING CONSISTS OF TWO OPTICAL FLATS WITH GRATING ELEMENTS LOCATED BETWEEN THEM, THE SPACING OF THE OPTICAL FLATS BEING ADJUSTABLE TO CHANGE THE PHASE.
Inventors
- 👤 A Bramley
Bibliographic Details
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