GB564297A - Improvements in stereoscopes for viewing left and right eye pictures separately displayed or projected - Google Patents

Abstract

564,297. Stereoscopes. SPINNEY, R. D. June 17, 1943, No. 9717. [Class 97 (i)] In apparatus comprising reflectors for use in viewing right and left eye pictures, separately displayed or projected, the angle of vision of each eye is restricted by the use of narrow slits or holes, either alone or in combination with shields or narrow mirrors ; the displayed or projected pictures may be laterally spaced or one above the other. Fig. 1 shows a viewing apparatus comprising angularlyadjustable mirrors 1, 1a, fixed mirrors 2, 2a and narrow slits 3, 3a before the observer's eyes 5, 5a. The slits 3, 3a may be more widely separated at their top ends than at their lower ends, so that different inter-pupillary distances may be accommodated by vertical adjustment of the whole apparatus; the slits may be replaced by variously spaced pairs of holes. Modifications are described comprising shields in conjunction with the mirrors, mirrors with edges inclined to the vertical, or reflecting prisms arranged for viewing pictures one above the other. Fig. 5 shows a construction in which lenses 7, 8 and shields 6b, 6c are combined with mirrors 1, 2 and viewing slits 3. Constructions are also described embodying spectacle sides, or a handle and head-rest, the latter construction also having means whereby the mirrors may be angularly adjusted or moved to a cleaning position.