SU917155A1 - Trichromatic polarization optical system - Google Patents

Description

(St) THREE COLOR POLARIZATION OPTICAL SYSTEM

one

The invention relates to optical instrumentation, in particular for creating color splitting units for transmitting a color image in television.

A device is known for isolating certain spectral zones with a sequence of prisms 1.

The disadvantages of these devices are large size, inconvenience in operation, sensitivity to vibration.

It is also known a device for changing the energy balance in the blue and red regions of the light source spectrum during a color photograph. In this device, two polymer films are used as color polarizers, having one of the characteristics achromatic and the other chromatic 2.

A disadvantage of the known device is that, with its help, only two spectral

zones, whereas all the variety of colors existing in nature can be obtained by mixing three primary colors: KpacHoho, blue and green.

The purpose of the invention is to make it possible to select three spectral zones. ,

This goal is achieved by adding a chromatic phase plate to the filter and

10 neutral floor.

FIG. 1 is a diagram describing the operation of the optical system; in fig. 2-k - transmission curves of individual elements and systems in

ts whole.

The device contains neutral flooring. 1 and 3, phase plate 2 and colored chromatic polarizers k and S, and constructively

20, the first neutral polarizer and phase plate are glued together.

Claims (2)

The device works as follows. White light falls on neutral pole 1 and a flat polarized coherent beam emerges from it. Phase plate 2 is cut out in such a way that the axis of its highest speed is the angle tS, with the axis of transmission of the neutral polarizer, therefore the beam in it splits into two coherent beams, which propagate at different speeds and acquire a certain phase difference at the plate output. The neutral polarizer installed behind the phase plate provides the location of the direction of oscillations of both components in one plane, the condition necessary for the implementation of interference. The chromatic phage plate 2 is designed in such a way that when the neutral polarizers 13 are crossed (Fig. 1a), as a result of the interference, a green region is output that corresponds to the spectrum of the second PSIA (Fig. 2, curve 6). With mutually parallel distribution of the neutral floors of corrugators 1 and 3 (Fig. 16, c), additional colors — blue and red (Fig. 2, curve 7) —are given for the elements and 5 shown in Fig. 3 One of the visas of the characteristics of these polarizers is neutral (curve K, for a polarizer "and Kj for a polarizer 5) and another is a cut-off type with opposite signs of steepness K, and Ku for polarizers i and 5, respectively. With the arrangement of the elements shown in FIG. 1a, the system — the polarizer, the phase plate, the polarizer — passes the green region of the spectrum. Chromatic polarizers k and S with a given orientation of the polarization plane defined by polarizer 3 have a neutral characteristic Kj and K J, 1, the system as a whole transmits the green region of the spectrum (Fig. C, curve 8). When the elements are oriented., corresponding to FIG. 16, i.e., when the neutral polarizer 3 and the chromatographic polarizer k are rotated relative to the initial position by 90®, the polarizing system 1, the phase plate 2, the polarizer 3 passes the blue and red spectral regions. The axes of polarizers 3 and 5 are crossed, therefore, the polarizer has a transmission characteristic corresponding to the K2 curve, and polarizer 4 is neutral. The system as a whole misses the blue color (Fig. K, curve 9). If the filter elements are arranged as shown in FIG. 1b, then in this case, polarizer 5 has a neutral characteristic (Fig. 3, curve K2), and polarizer k has a transmission characteristic corresponding to the curve, Fig. 3. The system as a whole misses the red color (FIG. A, curve 10). The proposed system can be used in color television systems. Claims of the invention A three-color polarization optical system consisting of a posteriorly arranged neutral polarizer and two chromatic polarizers, characterized in that, in order to enable the separation of the three spectral zones /, a chromatic phase plate and a neutral polarizer are additionally installed . Sources of information taken into account in the examination 1. US Patent No. 40099 1,, cl. 350-173, published. 1977. 2. US patent number 2298059, class. 350-Ц8, published. (prototype). but GMK Sob fS HH w