Title:
PROJECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/214317
Kind Code:
A1
Abstract:
A projection device comprises a light source and a digital micro-mirror element. The digital micro-mirror element is configured to receive and modulate light emitted from the light source to form an image beam. The projection device further comprises a refractor set (22) and a reflector (23) sequentially provided along a traveling direction of the image beam emitted from the digital micro-mirror element. The refractor set (22) comprises a first lens group (221), a second lens group (222), and a third lens group (223) sequentially provided along the traveling direction of the image beam. A distance between the third lens group (223) and the reflector (23) is fixed, and at least one of the first lens group (221) and the second lens group (222) is configured to be capable of moving along the traveling direction of the image beam or moving along a direction opposite to the traveling direction of the image beam, so as to adjust a focal plane of a projection imaging system (20) consisting of the refractor set (22) and the reflector (23). The diopter of the first lens group (221) and the second lens group (222) is positive, and the diopter of the third lens group (223) is negative.
Inventors:
YIN LIANG (CN)
DONG SHUBIN (CN)
DONG SHUBIN (CN)
Application Number:
PCT/CN2019/075892
Publication Date:
November 14, 2019
Filing Date:
February 22, 2019
Export Citation:
Assignee:
QINGDAO HISENSE LASER DISPLAY CO LTD (CN)
International Classes:
G03B21/14; G02B9/12; G02B11/18; G02B27/18
Foreign References:
| CN107664823A | 2018-02-06 | |||
| CN107144944A | 2017-09-08 | |||
| CN106125265A | 2016-11-16 | |||
| CN106842590A | 2017-06-13 | |||
| CN105892025A | 2016-08-24 | |||
| CN102269917A | 2011-12-07 | |||
| CN104181695A | 2014-12-03 | |||
| US20180074302A1 | 2018-03-15 |
Attorney, Agent or Firm:
BEIJING ZBSD PATENT & TRADEMARK AGENT LTD. (CN)
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