Optical: systems and elements – Diffraction – From zone plate
Patent
1990-03-12
1992-06-16
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
From zone plate
359569, 359575, 359742, 369109, G02B 518, G02B 308, G02B 2744
Patent
active
051229030
ABSTRACT:
An optical element having a substrate and a composite grating pattern formed thereon. The pattern is constituted with two different kinds of grating patterns superimposed on the substrate. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern, a light focusing or collimating function (i.e. a lens function) is implemented. When the other pattern is formed in an equally separated linear grating pattern, the optical element develops the lens function and a function to diffract lights through the linear grating. When one of the two kinds of grating patterns is formed in a Fresnel lens pattern and the other pattern is implemented in an unequally separated linear grating pattern, a lens function to focus lights onto a point and a cylindrical lens function to focus lights in a linear contour are obtained. Consequently, when parallel lights are incident to the optical element, there occurs astigmatism.
REFERENCES:
patent: 1483636 (1924-02-01), Horni
patent: 1944154 (1934-01-01), Dickson
patent: 3020395 (1962-02-01), Peltz
patent: 3504606 (1970-04-01), Macovski
patent: 3533340 (1970-10-01), Macovski
patent: 3536371 (1970-10-01), Post
patent: 3603668 (1971-09-01), DeBitetto
patent: 3839108 (1974-10-01), Leinkram
patent: 4082433 (1978-04-01), Appeldorn et al.
patent: 4130346 (1978-12-01), Polley
patent: 4448485 (1984-05-01), Bergman et al.
patent: 4733943 (1988-03-01), Suzuki et al.
patent: 4737447 (1988-04-01), Suzuki et al.
patent: 4869568 (1989-09-01), Schimpe
patent: 4871233 (1989-10-01), Sheiman
Rogers, "The Manufacture of a Stepped Zone-Plate," J. Scientific Instruments, vol. 43, 1966, pp. 328-329.
M. G. Moharam et al., "Diffraction Characteristics of Photoresist Surface-Relief Gratings", Applied Optics, vol. 23, No. 18, Sep. 15, 1984, pp. 3214-3220.
Ono et al, "Birefringement Grating Polarizer", Microoptics News, Bishyo-Kogaku Kenkyu Group, vol. 7, No. 3, Oct. 12, 1989, pp. 30-35.
Aoyama Shigeru
Ohgaki Tatsuo
Yamashita Tukasa
Arnold Bruce Y.
Lerner Martin
Omron Corporation
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