Display instrument using optical collimation
AssigneeThomson-CSF
InventorYves Cojan
Life of this patent
Estimating the term…
Abstract
A display instrument using optical collimation for projecting data into the line of sight of an observer, comprising an optical lens which projects images of luminous objects focused at infinity onto a transparent combining glass. The projected images of the luminous objects corresponding to data are reflected by the glass into the observer's line of sight. A semi-transparent optical mirror is arranged parallel to the glass at a greater distance from the optical lens, to provide an enlargement in elevation of the original pupil as defined by the outline of the image of the lens through the glass.
Claims10
A display instrument using optical collimation for projecting data in the form of luminous marks into the observer's normal line of sight, said instrument comprising:
- luminuous objects representing said data, an optical objective for projecting an image of said objects to infinity, a combining glass formed by a first plane semi-transparent mirror for reflecting said projected image into said line of sight, and optical means for enlarging the original optical pupil as defined by the outline of the image of the objective through the combining glass, by producing an additional optical pupil which, in conjunction with the original optical pupil, forms an enlarged resultant pupil, said optical means for enlarging comprising a second plane semi-reflective glass which is arranged parallel to said first glass at a greater distance from the objective and on the opposite side of said combining glass from said optical objective and which causes by transmission through said combining glass and reflection on said second semi-reflective glass said original optical pupil to be enlarged in elevation.
Dependencies are inferred from the claim text.