SU100233A1 - Movie corrective light filter - Google Patents

Description

Methods are known for changing, by means of light filters, the spectral composition of the light of a printing lamp. The proposed light filter differs from the known ones in that the change in the spectral composition of the light of the reading lamp is achieved in that the use of light effects and light interference in the light filter allows the intensity and color of the printing voltage to vary depending on the optically active light. records.

The device of the proposed filter shown in the drawing.

In the course of the beam from the light source / there is a polaroid 2 installed, a transparent dielectric 3 (ven. 1, a substance having a billow face under the action of an electric detector, for example, glass, nitrobenzene, etc.), the second polaroid 4 located in a crevice position to the first polaroid 2. Polaroid 4 is an analyzer for a printing light quantity control system and a polarizer for a subsequent color change system of the printing beam. In optical contact with the second polaroid 4, a birefringent compensation plate d (quartz, mica, cellophane, etc.) is mounted.

Then, a quartz plate 6 cut out parallel to the optical axis is mounted, to which an electrical voltage is applied to rotate the polarization silo. The third poloid 7 is installed in the position, has lashed; 1. the second half of the road 4.

The optical effect of the phenomena that occur when white light passes through an electro-optical corrective light) is the interference of polarized light rays. The polarization polarization and the rotation of its plane are used to change the amount of light. The beam of white light, through the first polaroid 2, turns out to be plane-polarized. In a quartz plate 3 oriented towards darkness, the direction of beam oscillations does not change, and the beam is extinguished by the second polaroid 4, which is in the crossed position to the first beam. Under the influence of the electric national environment, a quartz plate acquires the ability to rotate the plane of polarization of light, which has passed through crossed polys. In this way the dosage of light is carried out. A plane-polarized beam of light that passes through the second polaroid 4 enters the anisotropic plate 5. A linearly polarized beam, entering into this plastic, decomposes into two pyrologic and polarized rays that are opposite to the rotation sign inside the crista; la (plates) idzt with different speeds, as a result of which, on leaving the plate, they have a phase difference (a1mplit) de). These two circularly polarized beams, folding, form again one L Ptingly polarized beam, but its plane KOj e6aHHl now appears to be rotated at some angle relative to the original. The magnitude of the rotation depends on the angle of the particle, as well as on the length of the passage of the PSD light.

The Kvartsev or another vampy plate, but no1, an enpa between crossed floors, under white light, becomes interfeponic. This color changes as the polaroid rotates. Since the third polaroid is installed on the second paralleloid, and on the quartz plate, I turn the polarization plane.

a certain average electrical voltage is given, the dispersive plastic 5 is set so that the color is not observed.

The variable voltage determines the difference in the rotation of the polarization plane and, therefore, different colors, i.e., it changes the spectral composition of the printing light. A decrease in the voltage of the slopes gives a blue color, an increase in yellow, a further increase in red, and so on.

The subject is invented and

Corrective motion picture printing film, characterized in that, in order to change the intensity and chromaticity of the printing light without changing the filter set in the copier, it removed a film of three polys and three anisotropic plates, two of which are variable But the magnitude of the electric voltage, one for changing the spectral composition, the other for changing the intensity of the light passing through the filter.

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