Light masking device
AssigneeInvisible Optics Inc.
InventorPeter Softly
Life of this patent
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Abstract
A light masking device in accordance with the present invention comprises a support frame adapted to be positioned in front of the screen and an optical filter supported thereby, the optical filter comprising a grating of spaced, elongated planar slats extending horizontally across the width of the screen, the slats being differentially inclined from the horizontal in the directions of their widths so as to converge on a horizontal line at a selected height and a selected distance from the screen. In a preferred embodiment of the invention the slats are pivotally connected to the support frame for pivotal movement about respective horizontal axes, and means are provided for differentially adjusting the inclinations of the slats for selectively adjusting the position of the horizontal line on which the inclined slats converge.
Claims11
A light masking device for improving image contrast on a video display screen under conditions of high ambient light, comprising a support frame adapted to be positioned in front of the screen and an optical filter supported thereby, the optical filter comprising a grating of spaced, elongated planar slats extending horizontally across the width of the screen, the slats being differentially inclined from the horizontal in the directions of their widths so as to converge on a horizontal line at a selected height and a selected distance from the screen, wherein the slats are pivotally connected to the support frame for pivotal movement about respective horizontal axes, the device further comprising linkage means interconnected with the slats for differentially adjusting the inclinations of the slats for selectively adjusting the position of said horizontal line on which the inclined slats converge.
A light masking device for improving image contrast on a video display screen under conditions of high ambient light, comprising:
- a rectangular support frame adapted to be positioned in front of the screen, the support frame comprising a pair of upright end members and a pair of upper and lower cross members,
- an optical filter supported by the support frame, the optical filter comprising a grating of spaced, elongated planar slats extending horizontally across the width of the frame, the slats being pivotally connected at their ends to said upright frame members for pivotal movement about respective horizontal axes,
- the slats being differentially inclined from the horizontal in the directions of their widths so as to converge on a horizontal line at a selected height and a selected distance from the frame, and
- adjustment means interconnected with the slats for differentially adjusting the inclinations of the slats for selectively adjusting the position of said horizontal line on which the inclined slats converge.
A light masking device comprising a support frame defining an aperture and an optical filter supported thereby to intercept light falling on said aperture, the optical filter comprising a grating of spaced, elongated planar slats extending parallel to one another across the width of the aperture, the slats being differentially inclined in the directions of their widths so as to converge on a line extending parallel to the slats at a selected distance therefrom, wherein the slats are pivotally connected to the support frame for pivotal movement about respective longitudinal axes, the device further comprising linkage means interconnected with the slats for differentially adjusting the inclinations of the slats for selectively adjusting the position of said line on which the inclined slats converge.
Dependencies are inferred from the claim text.