SU830279A1

SU830279A1 - Light modulator

Info

Publication number: SU830279A1
Application number: SU792803052A
Authority: SU
Inventors: Игорь Борисович Трофимов; Александр Дмитриевич Бжезинский
Original assignee: Предприятие П/Я В-8941
Priority date: 1979-07-30
Filing date: 1979-07-30
Publication date: 1981-05-15

Description

1one

Изобретение относите к оптоэпек-рронике и может быть использовано в качестве электрически управл емой диаф- , рагмы в различных оптических приборах .The invention is attributed to opto-epic equipment and can be used as an electrically controlled diaphragm and ragma in various optical devices.

Известны электрооптические линзы дл -управлени световым потоком, содержащие электрооптическ й элемент, на рабочие поверхности которого нанесены прозрачные электроды l}.Electro-optical lenses are known for controlling the luminous flux, containing an electro-optical element, on the working surfaces of which transparent electrodes l} are applied.

Наиболее близким по технической сущ1ЮСТИ и достигаемому результату к изобретению вл етс модул тор света, содержащий пол ризатор, электрооптический элемент, выполненный в виде линзы, котора снабжена прозрачными электродамиГ27 .The closest in technical essence and the achieved result to the invention is a light modulator containing a polarizer, an electro-optical element made in the form of a lens, which is equipped with transparent electrodes G27.

Недостатками этого модул тора вл ютс высокие управл ющие напр ж&ни и мала апертура модул тора.The disadvantages of this modulator are the high control voltages & and the modulator aperture is small.

Цель изобретени - уменьшение управл юшего напр жени и увеличение апертуры модул тора.The purpose of the invention is to reduce the control voltage and increase the modulator aperture.

22

Цель достигаетс тем, что в модул торе света, содержащем пол ризатор, электрооптический элемент, выполненный в виде , котора снабжена прозрачными электродами, и анализатор, пинза выполнена из материала, обладающего продольным электрооптическим эффектом , а рабоча толщина линзы по оп1ической оси отличаетс от толщины ее на Kpascc не менее, чем в два раза.The goal is achieved by the fact that in a light modulator containing a polarizer, an electro-optical element, made in the form that is equipped with transparent electrodes, and an analyzer, the pinz is made of a material with a longitudinal electro-optical effect, and the working thickness of the lens on the optical axis differs from its thickness on Kpascc at least twice.

Нафиг. i и 2 изображены схемы различных вариантов модул тора. .Nafig i and 2 are diagrams of various modulator variants. .

Модл тор света содержит пол ризатор 1, электрооптический элемент 2, снабженный прозрачными электродами 3, и The light modulator contains a polarizer 1, an electro-optical element 2 equipped with transparent electrodes 3, and

s выполненный в виде линзы, и анализатор 4.s made in the form of a lens, and analyzer 4.

Claims

The light from the source passes through polarizer 1 and falls on the surface of an elactro-optic element 2 equipped with transparent electrodes 3. The floor, by the action of the guiding voltage supplied to the transparent electrodes 3, the material of the electro-optical element 2 changes the magnitude of the double-bins. The intensity of the electric field required for this is first created in areas where the top lens in the direction of the propagation of nanmanish light. Thus, with an increase in the magnitude of the control voltage in the system, the enlightenment boundary in the system moves from the center of the lens to the edge (for a negative lenses) or from the edges of the line; PS to the center (for a positive line; PS). . An expanding or narrowing cut-off image is observed (Fig, 1, 2). A lens made of fine-grained (grain size less than 2 microns) or coarse-grained (grains larger than 2 microns) of PZTL 7/65/35 type ferroceramics with an EO of 5-6 KB.CM can serve as an electro-optical element. A lens made of such a material with a diameter of 15 mm with 1 edges and a center of 0.2 mm and 0.5 mm, respectively, has a control voltage of 100 250 V to E, 5 Kasm and 120-300 V dp E 6 KB- cm-In this case, the magnitude of the control voltage is determined by the thickness of the lens and the intensity of the coercive field. One of the variants of such a modulator can be an electro-optical element 2, made of a material that has the effect of controlled scattering under the action of a longitudinal electric field. In this case, the field is 79, 4. no tori are required, and a lens made of such a material modulates the luminous flux over the cross-sectional area, in conjunction with a change in Transparency, starting from the periphery to the center, or from the center to the periphery, depending on the type of lens (negative or positive). This technical solution makes it possible to increase the cross section of the modulator several times in comparison with the known one, when the magnitude of the control voltage is much lower than in the known device. Claims of the invention A light modulator containing a polarizer, an electro-optic element shaped as a lens which is provided with transparent electrodes, and an analyzer characterized in that the lens is designed to increase the aperture of the modulator in order to allow the ii / feHbffieHKa of the control voltage a material having a longitudinal electro-optical effect, and the working thickness along the optical axis differs from its thickness at the edges by no less than two times. Sources of information taken into account in the examination 1. USSR author's certificate NO 6J.H67, cl. q02 3/14, 1978-.

2. USSR author's certificate No. 525042, cl. G O2P1 / 03, 1977.