Optical: systems and elements – Diffraction – From grating
Patent
1995-03-28
1998-01-20
Dzierzynski, Paul M.
Optical: systems and elements
Diffraction
From grating
359566, 359575, 2502081, G02B 518, G02B 2744, H01L 2700
Patent
active
057106673
ABSTRACT:
A focus detecting optical system for detecting a focus condition of an image of an object to be picked-up by an image forming lens including a condenser lens arranged in a vicinity of a predetermined focal plane of the image forming lens, aperture stop having a plurality of apertures, a plurality of image reforming lenses and a plurality of light receiving element arrays. At least one diffractive optical element having a lens function due to a diffraction is provided on a surface of the condenser lens or image reforming lenses. The diffractive optical element may be formed by kinoform or binary optical element having a step-wise configuration. The diffractive optical element may be formed in a surface of an infrared cut filter.
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Londono, et al, "Modeling Diffraction Efficiency Effects When Designing Hybrid Diffractive Lens Systems", Applied Optics, vol. 31, No. 13, May 1992, pp. 2248-2252.
Chang Andrey
Dzierzynski Paul M.
Olympus Optical Co,. Ltd.
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