Title:
PROJECTION LENS AND PROJECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/036134
Kind Code:
A1
Abstract:
Disclosed is a projection lens, comprising several lenses arranged between a projection plane and a display chip (800), the lenses sequentially comprising a first lens (100), a first lens group (200), a second lens group (300) and a second lens (400) in a direction from the projection plane towards the display chip (800), wherein the first lens (100) has a first surface (110) that is concave towards the projection plane and a second surface (120) that is concave towards the display chip (800); the second lens (400) has a third surface (410) that is convex towards the projection plane and a fourth surface (420) that is convex towards the display chip (800); and the first lens (100) has a negative focal power, and the second lens (400) has a positive focal power. A projection device is further disclosed. According to the projection lens and the projection device, the problem of an existing projection lens having a small aperture, resulting in a low projection brightness of the projection device and affecting the display of the projection picture is solved.
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Inventors:
HE SHIFENG (CN)
Application Number:
PCT/CN2019/128800
Publication Date:
March 04, 2021
Filing Date:
December 26, 2019
Export Citation:
Assignee:
GOERTEK INC (CN)
International Classes:
G02B13/00; G02B13/18; G03B21/14
Foreign References:
| CN110568586A | 2019-12-13 | |||
| CN109001887A | 2018-12-14 | |||
| CN109407279A | 2019-03-01 | |||
| CN107272153A | 2017-10-20 | |||
| CN103080808A | 2013-05-01 | |||
| CN103869450A | 2014-06-18 |
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