SU18022A1 - Light beam splitter for color cinematography - Google Patents

Description

In many ways of producing motion pictures in natural colors through a single lens, it is encountered; the need to divide the light beam into two or three parts. Instead of the complex prisms used for this purpose, etc., the inventor proposes a device consisting of three glass or mica plates, one or two of which are equipped with small holes, so that the strip skips one half of the rays, and the other half reflected.

In the schematic drawing of FIG. 1 shows the first version of the device; FIG. 2 is a second adaptation option; FIG. 3-plastic with holes.

Behind the lens S (Fig. 1 and 2) at an angle of 45 ° to it is glass or mica on plate C, in parallel to which two plates C | and co.

Average plate C | (Fig. I) is shown with small openings O (Fig. 3) located in a checkerboard pattern and so that one of the loppie rays falling on this plate is reflected from it, and the other half pass on the plate C.

In addition to the middle plate C |, the same plate C can also be provided with the top plate C (Fig. 2). In this case, the plate C half of the rays passing through the lens If, skips to the film, and the other half reflects on the plate Ci. The latter, in turn, reflects half of the rays falling on it, and half transmits Cj to the lower plasty. Plate G fully reflects the falling rays.

A thin layer of amalgam may be applied to the plates C, Ci and C2, after which the upper and middle, or one middle plate, is provided with holes O,

Subject Patent a.

1. A device for dividing the light beam for cyanic cinematography by means of a single ooectics. characterized by use, located at an angle of 45 to the circumference of ft and parallel to one another, of three glass or mica plates (, fl and C, of which the middle plate (