Title:
DIFFRACTIVE OPTICAL ELEMENT, OPTICAL SYSTEM, AND IMAGE CAPTURING DEVICE
Document Type and Number:
Japanese Patent JP2017146561
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a diffractive optical element that is easy to manufacture and capable of preventing image quality degradation due to rainbow flare, and to provide an optical system and an image capturing device.SOLUTION: In order to clear the above problem, an optical system is provided, which includes an optical surface with a fine periodic structure having a certain pitch caused by machining marks, and satisfies a predetermined conditional expression (1), where p (μm) represents the certain pitch, w (μm) represents a wavelength of a light ray of a shortest wavelength in a wavelength range in which the optical system is used, and ω' (°) represents an incident angle of a light ray having a maximum field angle among all the rays passing an optical axis on the optical surface.SELECTED DRAWING: Figure 1
Inventors:
KOMORI KAZUNORI
SEGAWA TOSHIYA
HOSOYA SHIGEKI
SEGAWA TOSHIYA
HOSOYA SHIGEKI
Application Number:
JP2016030295A
Publication Date:
August 24, 2017
Filing Date:
February 19, 2016
Export Citation:
Assignee:
TAMRON KK
International Classes:
G02B13/02; G02B3/00; G02B3/08; G02B5/18; G02B13/04; G02B13/18
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Foreign References:
| US20120093191A1 | 2012-04-19 |
Attorney, Agent or Firm:
Katsuhiro Yoshimura
Hiroko Negishi
Hiroko Negishi