Method for making a composite back projection screen
Abstract
Abstract COMPOSITE BACK PROJECTION SCREENS ARE DESCRIBED CHARACTERIZED BY A CYLINDRICALLY LENTICULATED BACK FACE AND A SELECTIVELY DARKENED FRONT FACE HAVING REFRACTING LENS COMPONENTS POSITIONED AT THE UNDARKENED FOCI OF THE BACK LENTICULES. THE REFRACTING LENS COMPONENTS ARE FORMED EITHER BY SELECTIVELY NOTCHING A FRESNEL LENS INTO THE FLAT FRONT FACE OF THE PROJECTION SCREEN OR BY LENTICULATING THE FRONT FACE OF THE SCREEN AND UTILIZING AN APPROPRIATE PORTION OF THE LENTICULES'' ARCUAL SURFACE AS THE REFRACTING LENS COMPONENTS. CONTROL OF BOTH THE HORIZONTAL AND THE VERTICAL VIEWING ANGLES IS ACCOMPLISHED BY THE FORMATION OF REFRACTING LENS COMPONENTS IN BOTH FACES OF A UNITARY SCREEN IN OPTICAL REGISTRATION WITH SPHERICAL LENS COMPONENTS SITUATED ALONG THE BACK FACE OF THE UNITARY SCREEN.
Inventors
- 👤 William E Glenn Jr
Bibliographic Details
Claims Analysis
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