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DECEMBER 1, 2008 |
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Film Projectors l SP-75E MP-75E MP-75E Multi-Format Special Venue 35/70mm Electronic Projector
Features:
The MP-75E projector has been designed for superb reproduction of 35 mm and 70 mm theatrical and 70 mm special venue films. The precision electronic intermittent and film transport mechanisms have been especially developed for the high mechanical stress of 8 and 10 perf 70 mm film projection. The special construction of the film gate assures a stable picture and prevents film buckling and resultant focus problems. Construction The MP-75E projector is built in a solid steel column that contains the film transportation mechanism, controls and wiring. The steel column pivots in a rigid base and can be tilted +10º or -10º to accommodate the projection situation. The pad shoes can be easily removed and are kept in place by an elegant twist-lock mechanism. The film trap consists of Delrin runner strips and ceramic guide rollers. The Delrin gate lifts off without tools. Stop rings on the lens barrel assure a lens change without change of focus. Film mechanism This projector uses a radically different design. Some Highlights: One tiny custom-made water-cooled motor drives the intermittent sprocket directly. The heat sink for the intermittent motor's power transistors is water-cooled as well. A more conventional motor drives all the feed and take up sprockets via a fiberglass reinforced toothed belt. Another drives the oversized high speed counter rotating shutters (which give over 30% more light transmission than our standard units). The framing is electronic and therefore continuous (no more "It's turned against the stop") and remote-able at no additional cost. A water cooler/heat exchanger is included, which also cools the gate. All guide rollers and sprockets have flanges so that even badly damaged prints are guided safely through the projector. Lateral guidance in the film gate is obtained by three pairs of ceramic discs, two above and one below the aperture. These prevent film weave in the gate. Synthetic Delrin is used for the runner strips in the film gate, pressure skates and pad shoes to prevent film disengaging from the sprocket teeth. The self-lubricating delrin has been chosen because it will not abrade the film, and emulsion residues do not adhere to it. The typical film dust problem is therefore non-existent. All sprockets, guide rollers and sound drums only contact the film outside the image area. The film path has been designed so that all changes of film direction follow the minimum possible radius and each curve has a very gradual transition from one to the next. This is extremely important for smooth, safe passage of film splices. All parts of the drive mechanism have been manufactured to the highest possible precision and can be easily replaced. Film gate It is common knowledge that the difference in shrinkage between the emulsion and the film base tends to cause buckling. The emulsion side has a concave curvature at right angles to the direction of transport. Where the luminous flux and associated heat radiation is high, the emulsion tends to expand during illumination in the aperture and the emulsion surface becomes convex. This well known phenomenon called heat flutter affects each single frame and therefore the distance between lens and film is continually changed. By the shape of the runner plates and pressure skates, the film edges are pushed into one plane at the aperture. Because the film tends to maintain as uniform a curvature as possible while running, the film curves in the center of the image towards the light. Thus the buckling is avoided when the film is heated, and the residual curvature is so slight that the picture remains within the depth of focus of the lens. The film gate has a single, easily replaceable aperture plate. The film gate assembly is equipped with a chilled water cooling system in order to prevent overheating. Gate detail photos Lens holder Lenses with a diameter of 4" (101.6mm) are directly inserted in the lens holder. The focus position can be fixed by a stop ring and the center position of the lens holder is marked with a reference mark. Smaller diameter lenses are mounted in an intermediate ring which has also a stop ring to ensure accurate focus. An optional motorized lens turret with automatic aperture change for two or three 70.6mm lenses can be used instead of the lens holder. Controls All controls for the MP-75E projector are mounted on the operating side of the projector column. The easily accessible illuminated push button control panel is located at eye level. Remote control boxes are available. Light sources The lamphouse cables are included in the main wiring in the projector column. Lamphouses for Xenon lamps of 1600W - 20,000W can be mounted directly to the projector column. Options: A DTS or 6 track magnetic sound head may be mounted on the front side of the projector column. As part of the magnetic reproducer, a driven feed sprocket between the feed reel and the first rotating sound drum, two independent flywheels, a spring tension roller and a carefully designed film path provide wow and flutter-free sound reproduction. A wide selection of automations are available. Technical data
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