| 摘要 |
1,148,363. Optical projectors. ERNST LEITZ G.m.b.H. July 4, 1967 [July 6, 1966], No.30840/67. Heading G2J. An overhead projector has a deflecting mirror 6 which directs light from a fixed lamp and condenser system 1, 3, 4 downwardly on to a transparent or translucent information bearing strip 7 extending between two spools, a reflecting Fresnel lens 8 beneath the strip directing a light beam towards the projection system 9 which may be vertically shifted for focusing, or tilted about spindle 13 to raise the projected image. Mirror 6 may be a diffusing surface. Hand-writing on the surface of strip 7 may be projected. Lenses 11, 12 of system 9 may have the same shape as the sheet 7.
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