| 摘要 |
To reduce the accuracy requirements and permit greater tolerance in placing of a filament of a halogen cycle incandescent lamp (2) of low wattage, for examle 200 W, within a reflector, particularly to provide a source for projection of super-8 mm film on a ground-glass screen surface, the reflector is positioned in a range in accordance with the hyperbolic equations: A: 0.1477x2+1.2617xy+y2-31.461x+58.119y-1577.1=0 and B: 0.1201x2+1.2503xy+y2-30.554x+56.082y-1449.7=0. Preferably, the curvature of the hyperbola equation is C: 0.1339x2+1.2570xy+y2-31.028x+57.140y-1513.4=0.
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