Recently, digital projection systems have evolved quickly in accordance with their important role in multimedia displays and the market demand for higher performance. The general trend has been, higher performance requires more bulky and expensive systems. There are several approaches for the projection and illumination optics to overcome this trend. Among these is the use of aspheric lenses. Normally a plastic aspheric lens fabricated by diamond turning is regarded only for use in prototypes. However, this can be adopted into high-end products by careful consideration of several critical issues. A dffractive/refractive hybrid lens is another possible choice due to recent technical breakthroughs overcoming the superfluous diffracted light that has confined this hybrid lens to several special applications despite many advantages to use this promising element. A possible design example for a projection lens with the hybrid elements is suggested. LED illumination is a novel approach for a projection monitor that can be successfully commercialized in the near future. Because of their superb properties of long lifetime, good color saturation and high efficiency LEDs are useful in this application. An optical system that can maximize LED illumination efficiency is suggested.
Night-vision relay lens system with a diffractive/refractive hybrid lens which relays the image between the phosphor image plane of an image intensifying tube and a 35 mm film single-lens reflex camera was designed and made. The optical system consists of 5 lenses including 1 diffractive/refractive hybrid lens, whereas the conventional all refractive lens system has 7 lenses. After design and manufacture we compared the optical performances of both two lens systems. Since diffractive/refractive hybrid lens has an excellent feature to correct chromatic aberrations in the broad bandwidth visible spectral region, we could obtain the much higher resolution and better image quality from the lens system with the hybrid lens than those from the conventional lens system. The diffractive surface was fabricated with photolithographic methods to get 8 leveled zone structure and its micro profiles were inspected with scanning electron microscopy and atomic force microscope.
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