Projectors or projection-type viewers Accessories therefor

GPHYSICS G03Photography G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES ACCESSORIES THEREFOR

G03B21/00Projectors or projection-type viewers Accessories therefor

G03B21/001Slide projectors G03B21/003Cine-projectors G03B21/005Projectors using an electronic spatial light modulator but not peculiar thereto G03B21/006using LCD's G03B21/008using micro-mirror devices G03B21/02Multiple-film apparatus G03B21/04Picture "juke-boxes" G03B21/06affording only episcopic projection G03B21/08affording epidiascopic projection G03B21/10Projectors with built-in or built-on screen G03B21/11for microfilm reading G03B21/111of roll films G03B21/113Handling roll films G03B21/115of microfiches G03B21/116Handling microfiches G03B21/118Reader-printers G03B21/12adapted for projection of either still pictures or motion pictures G03B21/13Projectors for producing special effects at the edges of picture G03B21/132Overhead projectors G03B21/134Projectors combined with typing apparatus or with printing apparatus G03B21/14Details G03B21/142Adjusting of projection optics G03B21/145Housing details G03B21/147Optical correction of image distortions G03B21/16Cooling Preventing overheating G03B21/18Fire preventing or extinguishing G03B21/20Lamp houses G03B21/2006characterised by the light source G03B21/2013Plural light sources G03B21/202Incandescent light sources G03B21/2026Gas discharge type light sources G03B21/2033LED or laser light sources G03B21/204using secondary light emission G03B21/2046Positional adjustment of light sources G03B21/2053Intensity control of illuminating light G03B21/206Control of light source other than position or intensity G03B21/2066Reflectors in illumination beam G03B21/2073Polarisers in the lamp house G03B21/208Homogenising, shaping of the illumination light G03B21/2086Security or safety means in lamp houses G03B21/2093Details of lamp houses not provided in groups G03B21/2006 - G03B21/2086 G03B21/22Soundproof bodies G03B21/26Projecting separately subsidiary matter simultaneously with main image G03B21/28Reflectors in projection beam G03B21/30adapted to collapse or fold G03B21/32Details specially adapted for motion-picture projection G03B21/321Holders for films G03B21/323Cassettes G03B21/325Endless cassettes G03B21/326Means for fixing the film on the axis of a reel or spindle G03B21/328Means for fixing the film on the periphery of a reel G03B21/34Change-over arrangements G03B21/36Fades, dissolves, or wipes G03B21/38Prolonged exhibition of single frame G03B21/40Eliminating or reducing effect of flicker G03B21/42Preventing damage to film due to abnormal operation of projector G03B21/43Driving mechanisms G03B21/44Mechanisms transmitting motion to film-strip feed Mechanical linking of shutter and intermittent feed G03B21/46affording adjustment for framing G03B21/48for altering frame speed for regulating constancy of film speed G03B21/50Control devices operated by the film strip during the run G03B21/52by prepared film G03B21/53Means for automatic focusing G03B21/54Accessories G03B21/56Projection screens G03B21/562Screens moving during projection G03B21/565Screens allowing free passage of sound G03B21/567for colour projection G03B21/58collapsible G03B21/585Inflatable screens G03B21/60characterised by the nature of the surface G03B21/602Lenticular screens G03B21/604Polarised screens G03B21/606for relief projection G03B21/608Fluid screens G03B21/62Translucent screens G03B21/625Lenticular translucent screens G03B21/64Means for mounting individual pictures to be projected