Journal of the Society of Motion Picture Engineers (1930-1949)

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Fig. 12. The radial barrier arrangement. Fig. 13. Venetian-blind barrier. necessary parallax condition as shown in Fig. 13. The sides of the slats form two of the three image areas. The surface now resembles a Venetian blind. The height of the slats is equal to the distance D as in the other arrangements and is determined by the construction methods and formulae already given. Physical Limitations and How to Minimize Them Light Loss Caused by the Barrier. One defect in the practical application of parallax barriers is the transmission loss introduced by the barrier itself. This limitation can be minimized by replacing each aperture or slit by a spherical or a cylindrical lens, as shown in Fig. 14. Replacing the aperture by a larger size lens can theoretically cut the barrier loss to zero. Instead of acting as a mechanical barrier, the lenses refract or converge the rays to the proper position on the image surface. In stereoscopic picture processes modern practice calls for cylindrical lens elements Sam H. Kaplan: Theory of Parallax Barriers 19