Optical modulation device with deformable cells
First Claim
1. A light modulation device comprising a modulation mirror reflecting light to be modulated from a reflecting surface, the modulation mirror including cells of the cell type which are deformable under the effect of an electrical control voltage, each deformable cell being capable of exhibiting a variation (Δ
- L) of its length (L) as a function of the value of the control voltage providing a local deformation of the reflecting surface, the control voltage being applied between two opposite faces of each deformable cell, one of the faces being a fixed face and the other face being a moveable face, the control voltage being applied to each deformable cell through a respective photoconductor element, the modulation device further including;
means for adjusting resistivity exhibited by each photoconductor element as a function of the variation (Δ
L) desired for the corresponding deformable cell wherein the means for adjusting the resistivity of the photoconductor elements comprise a liquid-crystal screen including a plurality of liquid-crystal cells illuminated by a source of light and producing, in response, a plurality of microbeams of light, each photoconductor element being illuminated by at least one microbeam, anda wavefront sensor system, said sensor system delivering information relating to a phase correction to be performed on a light wave reflected by the modulation mirror, the said information being applied to the means for adjusting the resistivity of the photoconductor elements.
1 Assignment
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Accused Products
Abstract
Modulation mirrors including the deformable cells (CD1 to CDn) locally modified the planarity of a reflecting surface 18. The deformable cells deform under the effect of a voltage and the control of these deformable cells is such that a control voltage Vc is applied between a first and a second electrode 17, 26. A photoconductor element P1 to Pn is inserted between the second electrode 26 and the deformable cell (CD1 to CDn). A light beam (MF1 to MFn) illuminates the photoconductor element in order to obtain an elongation of the deformable cell.
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Citations
18 Claims
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1. A light modulation device comprising a modulation mirror reflecting light to be modulated from a reflecting surface, the modulation mirror including cells of the cell type which are deformable under the effect of an electrical control voltage, each deformable cell being capable of exhibiting a variation (Δ
- L) of its length (L) as a function of the value of the control voltage providing a local deformation of the reflecting surface, the control voltage being applied between two opposite faces of each deformable cell, one of the faces being a fixed face and the other face being a moveable face, the control voltage being applied to each deformable cell through a respective photoconductor element, the modulation device further including;
means for adjusting resistivity exhibited by each photoconductor element as a function of the variation (Δ
L) desired for the corresponding deformable cell wherein the means for adjusting the resistivity of the photoconductor elements comprise a liquid-crystal screen including a plurality of liquid-crystal cells illuminated by a source of light and producing, in response, a plurality of microbeams of light, each photoconductor element being illuminated by at least one microbeam, anda wavefront sensor system, said sensor system delivering information relating to a phase correction to be performed on a light wave reflected by the modulation mirror, the said information being applied to the means for adjusting the resistivity of the photoconductor elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- L) of its length (L) as a function of the value of the control voltage providing a local deformation of the reflecting surface, the control voltage being applied between two opposite faces of each deformable cell, one of the faces being a fixed face and the other face being a moveable face, the control voltage being applied to each deformable cell through a respective photoconductor element, the modulation device further including;
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17. A light modulation device comprising a modulation mirror reflecting light to be modulated from a reflecting surface, the modulation mirror including cells of the cell type which are deformable under the effect of an electrical control voltage, each deformable cell being capable of exhibiting a variation (Δ
- L) of its length (L) as a function of the value of the control voltage providing a local deformation of the reflecting surface, the control voltage being applied between two opposite faces of each deformable cell, one of the faces being a fixed face and the other face being a moveable face, the control voltage being applied to each deformable cell through a respective photoconductor element, the modulation device further including;
means for adjusting resistivity exhibited by each photoconductor element as a function of the variation (Δ
L) desired for the corresponding deformable cell wherein the means for adjusting the resistivity of the photoconductor elements comprise a liquid-crystal screen including a plurality of liquid-crystal cells illuminated by a source of light and producing, in response, a plurality of microbeams of light, each photoconductor element being illuminated by at least one microbeam; anda light source and an entry mask interposed between the latter and the reflecting surface, and an optical device of the "Schlieren optics" type, and an exit mask, interposed successively between the reflecting surface and a projection screen, the light source producing light intended to be reflected and modulated by the reflecting surface so as to produce images on the projection screen, video-type information relating to the images to be produced being applied to the means for adjusting the resistivity of the photoconductor elements. - View Dependent Claims (18)
- L) of its length (L) as a function of the value of the control voltage providing a local deformation of the reflecting surface, the control voltage being applied between two opposite faces of each deformable cell, one of the faces being a fixed face and the other face being a moveable face, the control voltage being applied to each deformable cell through a respective photoconductor element, the modulation device further including;
Specification