| 摘要 |
899,927. Optical viewing devices; mirror arrangements. CLAVE, S., and CLAVE, M. March 11, 1960 [March 13, 1959; June 8, 1959], No. 8623/60. Class 97(1). [Also in Group XL(a)] An optical device has a mounting adapted to protect an observer's zone against dangerous radiation emanating from a source separated from the zone by a radiation proof wall, this mounting comprising a tubular passage having radiation blocking screens alternatively attached to parallel walls thereof to provide a many angled passage therebetween and an arrangement of plane and cylindrical mirrors for directing a light beam from one end of the passage to the other. As shown in Fig. 1 a rectangular tube 1 is seated in a protective casing 2 in a concrete wall P, the tube 1 having inwardly directed radiation blocking screens 5-8 and also including an arrangement of plane mirrors and cylindrical mirrors 12, 13 for directing a light beam from a source of dangerous radiation in an enclosure C to an observation point O. The light is incident on an adjustable plane mirror 21 and is arranged to be incident at equal angles on the cylindrical mirrors 12 and 13 which are of the same or different focal lengths. In an alternative arrangement, the screens are designed to leave between them a sawtooth passage through which the light beam is directed by an even number of cylindrical mirrors each arranged at an angle in the passage, the light being directed on to the first cylindrical mirror by an adjustable plane mirror and the light from the last cylindrical mirror being directed on to the observation zone O by two plane mirrors or a prism. |
