Title:
DIFFRACTIVE OPTICAL ELEMENT CAPABLE OF BEING USED FOR PROJECTING OBLIQUE LINE, PROJECTION APPARATUS, AND DESIGN METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/135981
Kind Code:
A1
Abstract:
Provided is a design method for a diffractive optical element capable of being used for projecting an oblique line. The method comprises: determining an angle θ between an oblique line and a first direction (S101); according to the angle, determining a first period d1 of a diffractive optical element in the first direction and a second period d2 of the diffractive optical element in a second direction, wherein the first direction is perpendicular to the second direction, and the first period d1 and the second period d2 satisfy tgθ = d1/d2 (S102); and obtaining a phase distribution map of the diffractive optical element according to the first period d1, the second period d2 and a target map with an oblique line at 45 degrees (S103). By means of the design method, the visual effect of an optical field projected by means of a diffractive optical element can be improved.
Inventors:
WANG YIYAN (CN)
TIAN KEHAN (CN)
TIAN KEHAN (CN)
Application Number:
PCT/CN2020/137490
Publication Date:
July 08, 2021
Filing Date:
December 18, 2020
Export Citation:
Assignee:
JIAXING UPHOTON OPTOELECTRONICS TECH CO LTD (CN)
International Classes:
G02B27/00; G02B27/42; G06K7/10
Domestic Patent References:
| WO2019177617A1 | 2019-09-19 |
Foreign References:
| CN111240009A | 2020-06-05 | |||
| CN106324854A | 2017-01-11 | |||
| CN101401107A | 2009-04-01 | |||
| CN1977275A | 2007-06-06 | |||
| CN1713208A | 2005-12-28 | |||
| JPS60150184A | 1985-08-07 |
Other References:
See also references of EP 4063935A4
Attorney, Agent or Firm:
BEIJING LAWSING IP FIRM (CN)
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