| 摘要 |
<p>An optical collimating apparatus employs a semi-reflective concave mirror (42) and cholesteric liquid crystal element (44). In one embodiment, the optical collimating apparatus is used as a heads-up display device. Images in the line of sight of an observer substantially pass through a transmitter/combiner (40), semi-reflective concave mirror (42), and cholesteric liquid crystal element (44) to an observer. Images generated by an image source (34) are focused on the transmitter/combiner (40) such that the transmitter/combiner (40) reflects the images into the line of sight of the observer. The generated images are transmitted by the primarily transmissive (convex) side of the semi-reflective concave mirror (42) to the cholesteric liquid crystal element (44). The cholesteric liquid crystal element (44) reflects the generated images back toward the primarily reflective (concave) side of the semi-reflective concave mirror (42), which in turn reflects the images back toward the cholesteric liquid crystal element (44), which transmits the generated images to the observer. In an alternative embodiment, such as in a flight simulator or similar device, an image source projects images upon the primarily transmissive (convex) side of a semi-reflective concave mirror which transmits the images to a cholesteric liquid crystal element. The images are reflected by the cholesteric liquid crystal element back toward the primarily reflective (concave) side of the semi-reflective concave mirror. The images are then reflected by the semi-reflective concave mirror back toward the cholesteric liquid crystal element which transmits the images to the observer.</p> |
