Diffraktive Linse und Optische Vorrichtung damit

Details

Veröffentlichungs-Nr.

EP2955550

Aktenzeichen

EP15170694

Anmeldetag

4. Juni 2015

Veröffentlichung

27. Mai 2020

Erteilung

27. Mai 2020

Rechtsraum

EP

IPC

G02B5/18G02B27/42G02B19/00

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 (101) includes, on at least one surface, an optical surface (103, 104) with a plurality of areas defined by a plurality of steps. A blaze wavelength of the diffractive lens (101) is within a wavelength spectral range of a light source (102) used. An optical path difference between adjacent areas at the blaze wavelength is larger than a coherence length of the light source (102). The diffractive lens (101) substantially acts as a Fresnel lens at a wavelength other than the blaze wavelength.

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Firmen

Maxell, Ltd.
Hitachi Maxell, Ltd.

Land

🇯🇵 Japan

Fachgebiete