Title:
MICRO-LENS ARRAY-BASED LASER PROJECTION MODULE
Document Type and Number:
WIPO Patent Application WO/2023/246472
Kind Code:
A1
Abstract:
A laser projection module (10), comprising an illumination light source (11) and a micro-lens array (12), the micro-lens array (12) comprising a plurality of micro-lenses (12a), the plurality of micro-lenses (12a) being arranged at a first pitch P, and in a working mode of projecting a dot array light field, a working distance D1 of the micro-lens array (12) relative to the illumination light source (11) satisfying following relational expression (I), wherein N is a positive integer, and preferably N≤5, λ is the wavelength of light of the illumination light source (11), α is a coefficient, 0＜α≤1, and f is the focal length of the micro-lenses (12a). By means of appropriately selecting and optimizing the impact coefficient α for the focal length of the micro-lenses (12a), light energy of the dot array light field generated at the corresponding working distance can be focused to significantly smaller light spots, thereby greatly increasing the contrast ratio of a laser dot array.
Inventors:
FAN ZHENTAO (CN)
TIAN KEHAN (CN)
TIAN KEHAN (CN)
Application Number:
PCT/CN2023/097970
Publication Date:
December 28, 2023
Filing Date:
June 02, 2023
Export Citation:
Assignee:
JIAXING UPHOTON OPTOELECTRONICS TECH CO LTD (CN)
International Classes:
G02B3/02; H01S3/00; H01S5/00
Foreign References:
| CN115224583A | 2022-10-21 | |||
| CN216308923U | 2022-04-15 | |||
| CN106990659A | 2017-07-28 | |||
| CN113050067A | 2021-06-29 | |||
| US9273846B1 | 2016-03-01 |
Attorney, Agent or Firm:
BEIJING FANGKE LAW FIRM (CN)
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