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SEPTEMBER 8, 2008 |
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35mm/70mm Projectors l FP-75E MP-75E FP-75E
Features:
The FP-75E projector has been designed for superb reproduction of 35 mm and 70 mm films. The precision electronic intermittent and film transport mechanisms have been especially developed for the high mechanical stress of 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 FP-75E projector is built in a solid steel column that contains the film transportation mechanism, the optical and magnetic sound heads and the wiring. The steel column pivots in a rigid base and can be tilted +10º or -10º to accommodate the projection situation. 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 also. A more conventional motor drives all the feed and take up sprockets via a fiberglass reinforced toothed belt. Another drives the high speed dual blade shutter. The framing is electronic and therefore continuous (no more "It's turned against the stop") and remoteable at no cost. A water cooler/heat exchanger is included: it also cools the gate. All guide rollers and sprockets, except the intermittent sprocket, have flanges for both 35 mm and 70 mm film, so that even badly damaged prints are guided safely through the projector. Lateral guidance in the film gate is obtained by pairs of ceramic discs above and 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 35 mm and 70 mm sprockets, guide rollers and sound drums only make contact with film outside the image and soundtrack areas. 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. Wherever 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 comes under heat, and the residual curvature is so slight that the picture remains within the depth of focus of the lens. The film gate for 70 mm has a single, easily replaceable aperture plate and the 35 mm gate an adjustable plate with three apertures for normal, wide screen and CinemaScope. The film gate assembly is equipped with a chilled water cooling system in order to prevent overheating. Quick conversion from 35 mm to 70 mm All sprockets, guide rollers and sound drums in the FP-75E projector are dual profiled for both film formats such that each one's image is centered properly with respect to the optical centerline. This prevents the need for imprecise lens centering schemes. The only parts that need to be changed are the pad shoes, the film gate parts and the projection lens. 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. These units can be easily changed for conversion from one film gauge to another. Stop rings on the lens barrel assure a lens change without change of focus. The reel shafts can be changed quickly so that reels with a core diameter of 1/2" for 35 mm or 70 mm or 5/16" for 35 mm film can be used .  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 FP-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. Light sources The lamphouse cables are included in the main wiring in the projector column. Lamphouses for Xenon lamps of 1600W - 7000W can be mounted directly to the projector column. Sound The 6 track magnetic sound head is a self contained unit mounted on the front side of the projector column. 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. The standard Kinoton LED reverse-scan soundhead is used. This flywheel stabilized optical sound head has an extremely short start-up time. Both analog and Dolby Digital playback is available. Special versions For large screen and dome projection, various special versions of the FP-75E or SP-75E are available:
These projectors can be installed in any position. Technical data
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