Automatic focusing system for projectors and the like
Abstract
Abstract A FIRST APPRAISAL SUB-SYSTEM INCLUDES A FOCUSING LENS MOUNTED FOR MOVEMENT WITH THE PROJECTOR OBJECTIVE LENS TO ESTABLISH A FOCUSING AXIS PARALLEL WITH THE PROJECTOR OPTICAL AXIS. THIS SUB-SYSTEM INCLUDES A LIGHT SOURCE MOVABLY MOUNTED ON THE FOCUSING AXIS AND DETECTION MEANS RESPONSIVE TO VARIATIONS IN THE DISTANCES OF SUCH LIGHT SOURCE AND THE SCREEN FROM THE FOCUSING LENS AND FOR MOVING THE LATTER TO MAINTAIN A PREDETERMINED RELATIONSHIP BETWEEN SUCH DISTANCES. A SECOND APPRAISAL SUB-SYSTEM INCLUDES OTHER DETECTION MEANS FOR SENSING BUCKLING OR POPPING OF THE TRANSPARENCY AND FOR MOVING THE AFOREMENTIONED LIGHT SOURCE ALONG THE FOCUSING AXIS IN RESPONSE TO SUCH BUCKLING OR POPPING.
Inventors
- 👤 Oleg Szymber
- 👤 Norman Shim
Bibliographic Details
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