Diffractive lens and optical device using the same
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United States of America Patent
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Mar 13, 2018
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N/A
app pub date -
Jun 4, 2015
filing date -
Jun 11, 2014
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Abstract
An object of the present application is to thin a thick lens used in an automobile headlamp optical system and a projector lighting optical system while maintaining the optical properties of the lens. A diffractive lens includes, on at least one surface, an optical surface with a plurality of areas defined by a plurality of steps. A blaze wavelength of the diffractive lens is within a wavelength spectral range of a light source used. An optical path difference between adjacent areas at the blaze wavelength is larger than a coherence length of the light source. The diffractive lens substantially acts as a Fresnel lens at a wavelength other than the blaze wavelength.
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