Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1995-03-15
1997-05-06
Henry, Jon W.
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
359559, 359822, G02B 2746
Patent
active
056276788
ABSTRACT:
A Fourier transform optical apparatus for optically Fourier transforming an input image includes a spatial light modulator for displaying an input image, a light source for irradiating the input image on the spatial light modulator, a first convex lens and a first concave lens arranged near the spatial light modulator and a second convex lens arranged at the composite focal plane of the first convex lens and first concave lens. The respective focal lengths of these three lenses are determined to satisfy conditions such that a light ray passing an intersection of the spatial light modulator and an optical axis of the Fourier transform optical apparatus becomes a light ray parallel to the optical axis after passing the second convex lens and a light ray incident to the first convex lens in parallel to the optical axis is focused at the composite focal point of the first convex lens, first concave lens and the second convex lens.
REFERENCES:
patent: 5363455 (1994-11-01), Nishii et al.
patent: 5383056 (1995-01-01), Nshii et al.
Fukui Atsushi
Ito Masami
Nishii Kanji
Takamoto Kenji
Henry Jon W.
Matsushita Electric - Industrial Co., Ltd.
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