초록 ▼

A compact head-up display comprising a combiner which combines light energy from an outside view with light energy transmitted within the combiner and diffracted out by means of an upper diffraction grating. The head-up display disclosed further comprises an image source, a collimating lens, and a l

A compact head-up display comprising a combiner which combines light energy from an outside view with light energy transmitted within the combiner and diffracted out by means of an upper diffraction grating. The head-up display disclosed further comprises an image source, a collimating lens, and a lower diffraction grating for diffracting the collimated light energy into the combiner.

대표청구항 ▼

A head-up display for use in an aircraft cockpit having a windshield, comprising: source means for producing collimated light wavefronts of an image to be displayed to the pilot; an elongated optical element having a first end disposed in the path of the collimated light wavefronts produced by the s

A head-up display for use in an aircraft cockpit having a windshield, comprising: source means for producing collimated light wavefronts of an image to be displayed to the pilot; an elongated optical element having a first end disposed in the path of the collimated light wavefronts produced by the source means, a second end disposed in the field of view of the pilot through the windshield, and operative to internally reflect optical wavefronts from the first end to the second end; a first diffractive element supported at the first end of the optical element so that the collimated light wavefronts produced by the source means are incident upon the first diffractive element, the first diffractive element being operative to diffract the light wavefronts into the optical element, and a second diffractive element supported at the second end of the optical element operative to diffract the light wavefronts, diffracted into the optical element by the first diffractive element, out of the optical element in the direction of the pilot\s eye, while retaining the collimation thereof, the second end of the optical element and the second diffractive element being substantially transparent to light incident on the optical element from the field of view of the pilot through the windshield, whereby the pilot views in the image produced by the source means superimposed on his view through the windshield.