Title: Infrared diffractive lens
Application Number: 200610137363 Application Date: 2006.10.20
Publication Number: 1975468 Publication Date: 2007.06.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G02B3/00;G02B1/00;G01J5/00
Applicant(s) Name: Oki Electric Ind Co., Ltd. Address:
Inventor(s) Name: Sasaki Hironori
Attorney & Agent: huanglun wei
Abstract:
    This invention provides an infrared diffractive lens capable of focusing infrared rays within a wide range of wavelength band effectively. According to the present invention, there is provided an infrared diffractive lens including a concave-convex shape with predetermined depth defined based on a predetermined standard wavelength in a wavelength band of incident infrared rays, wherein: the incident infrared rays are within the wavelength band of 1.1-16 mum; a depth h of the concave-convex shape is defined by mlambda/(n-1) with regard to a refractive index n of material of lens, the standard wavelength lambda and a harmonic order m; and the harmonic order m is an integer between 2 and 10. Using the infrared diffractive lens with such a configuration makes it possible to focus infrared rays within a wide range of wavelength band effectively.
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