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Improvements in or relating to light projectors
Improvements in or relating to light projectors
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机译:投影仪或与之有关的改进
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520,131. Projector lamps; supporting lamps. BRIGHT, H. Oct. 7, 1938, No. 29182. [Classes 75 (iii) and 75 (iv)] A light projector suitable for illuminating picbures and other objects in an art gallery is mounted so as to be adjustable about a horizontal axis on a single-armed stirrup 5 which is adjustable about a vertical pivot 6 on a base 1 provided with holes by which it may be secured by screws to a standard conduit box in place of the usual cover. The light projector may comprise a cylindrical body 21 secured by screws 31 to a grooved front cover plate 10 formed with three facings 28 to any of which a bracket 29 carrying a lampholder 4 may be secured by a screw 30. The frame 26 of a reflector 25 secured to the body 21 by spacing screws 54 so as to allow ventilation reflects light from the lamp filament 60 towards a condensing lens system 32 arranged behind a focussing lens system 35 which is carried by a plate 36 secured to the plate 10 by springs 58 arranged beween nuts 37 and bolts 59. A shutter which may consist of adjustable metal strips or sheets may be inserted between plates 36, 10 so as for example to cut off light from a picture frame while illuminating the picture. A mask formed in accordance with the image obtained by the insertion of a photographic film between the plates 10, 36 may be substituted for the shutter. The body 21 is formed with a projection 9 secured by a screw 12 to the stirrup 5 and carrying a worm-wheel 13 engaged by an adjusting worm 14 on the stirrup. The stirrup 5 similarly carries a wormwheel 7 engaged by an adjusting worm 8 mounted in upstanding lugs on the base 1. The worms are internally threaded to receive operative screws 15, 18 at both ends. The inner ends of the screw engage to lock the screws together. The supply leads for the lamp issue from the conduit box through a bushing 3 in the base 1. Registered Design 830,906 is referred to in the Provisional Specification.
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