Title:
DIFFRACTION OPTICAL ELEMENT AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2018045238
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent deterioration of optical performance due to water absorption of a resin layer in a diffraction optical element and prevent cracks in the resin layer at high or low temperature and interfacial peeling thereof.SOLUTION: An diffraction optical element has a first layer and a second layer sequentially laminated on a base material, and an interface between the first and second layers to form diffraction grating. Height d of a grating part of the diffraction grating, average thickness t1 of the first layer, and average thickness t2 of the second layer satisfy the relations of 1.1×d≤t1≤50 μm and 30 μm≤t2≤(400 μm-t1-d).SELECTED DRAWING: Figure 1
Inventors:
NIWA MAIKO
Application Number:
JP2017175376A
Publication Date:
March 22, 2018
Filing Date:
September 13, 2017
Export Citation:
Assignee:
CANON KK
International Classes:
G02B5/18; G02B3/08
Foreign References:
| WO2008032447A1 | 2008-03-20 | |||
| WO2006090614A1 | 2006-08-31 | |||
| US10209412B2 | 2019-02-19 | |||
| US20170168301A1 | 2017-06-15 |
Attorney, Agent or Firm:
Okabe
Takao Ochi
Koji Yoshizawa
Masami Saito
Takao Ochi
Koji Yoshizawa
Masami Saito