Imaging device, and diffraction grating lens for use in the...

Details Imaging device, and diffraction grating lens for use in the... Imaging device, and diffraction grating lens for use in the...

2008-01-21

2011-10-25

Allen, Stephone (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S565000

Reexamination Certificate

active

08045268

ABSTRACT:
In a refraction lens having an aspheric shape formed thereon and having a positive power, a diffraction grating is formed on at least one of the faces of the refraction lens. In order to reduce the curvature of field and the chromatic aberration in a well-balanced manner, the zonal pitch of the diffraction grating is constituted so as to satisfy the following conditional expression.[eq.⁢19]0.21⁢⁢m2⁢vd⁢λ⁢fhmax<Λmin<0.30⁢⁢m2⁢vd⁢λ⁢fhmax(1)Herein, Λminis a minimum zonal pitch12; m is an order of diffraction; νdis an Abbe number of the lens substrate material with respect to the d-line; λ is a wavelength; f is an effective focal length; and hmaxis an effective radius13of the face on which the diffraction grating is formed.

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International Search Report for corresponding application No. PCT/JP2008/050693 mailed Apr. 15, 2008.
Form PCT/IPEA/409 and a partial English translation.

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