Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
OPHTHALMIC LENS
Document Type and Number:
WIPO Patent Application WO/2021/078198
Kind Code:
A1
Abstract:
An ophthalmic lens (100), comprising an optical lens (110), first diffractive structures (10), and second diffractive structures (20), wherein the first diffractive structures (10) and the second diffractive structures (20) are arranged alternately. The first diffractive structures (10) comprise first diffraction bands (12) and first diffraction steps (14). The second diffractive structures (20) comprise second diffraction bands (22) and second diffraction steps (24). The optical path difference caused by the heights in the first diffraction bands (12) is greater than 0.5 times the design wavelength. The heights of the first diffraction steps (14) are greater than the heights in the first diffraction bands (12), and the optical path difference caused by a first difference between the heights of the first diffraction steps (14) and the heights in the first diffraction bands (12) is 0.45-0.55 times the design wavelength. The optical path difference caused by the heights in the second diffraction bands (22) is greater than 0.5 times the design wavelength. The heights of the second diffraction steps (24) are less than the heights in the second diffraction bands (22), and the optical path difference caused by a second difference between the heights of the second diffraction steps (24) and the heights in the second diffraction bands (22) is 0.45-0.55 times the design wavelength.

Inventors:
LUO MIN (CN)
CAO LI (CN)
LI JIANLIN (CN)
Application Number:
PCT/CN2020/122902
Publication Date:
April 29, 2021
Filing Date:
October 22, 2020
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DONGGUAN HEC MEDICAL INTELLIGENT DEVICE R&D CO LTD (CN)
International Classes:
A61F2/16; G02B5/18
Domestic Patent References:
WO2017138099A12017-08-17
Foreign References:
CN110088669A2019-08-02
CN108697502A2018-10-23
CN109477913A2019-03-15
CN110062899A2019-07-26
US20170227789A12017-08-10
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
Download PDF: