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1. (WO2017150489) OPTICAL ELEMENT AND OPTICAL SYSTEM INCLUDING SAME

Pub. No.:    WO/2017/150489    International Application No.:    PCT/JP2017/007636
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: G02B 5/00
G02B 1/115
G02B 5/30
Applicants: CANON KABUSHIKI KAISHA
キヤノン株式会社
Inventors: KOGA Hironobu
古賀 悠修
Title: OPTICAL ELEMENT AND OPTICAL SYSTEM INCLUDING SAME
Abstract:
In the present invention, a substrate 11 is provided with an absorption layer 13. The transmissivity of the absorption layer 13 varies depending on the position of the substrate 11. The absorption layer 13 includes a first material and a second material that each have an absorption coefficient with a predetermined wavelength dependency. The extinction coefficient of the absorption layer 13 is 0.5 or smaller in wavelengths of 400-700nm.