Title:
PROJECTION LENS
Document Type and Number:
WIPO Patent Application WO/2019/114190
Kind Code:
A1
Abstract:
A projection lens, sequentially comprising from an image source side to an imaging side along an optical axis: a first lens (E1) having positive optical power or negative optical power, a second lens (E2) having positive optical power or negative optical power, and a third lens (E3) having positive optical power, the imaging side surface (S6) of the third lens (E3) being a convex surface. A distance TTL, on the optical axis, from the image source surface (OBJ) of the projection lens and the imaging side surface (S6) of the third lens (E3) and a total effective focal length f of the projection lens satisfy TTL/f<1.4, and an effective focal length f3 of the third lens (E3) and the total effective focal length f of the projection lens satisfy 0
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Inventors:
HUANG LIN (CN)
WANG XINQUAN (CN)
WANG XINQUAN (CN)
Application Number:
PCT/CN2018/087036
Publication Date:
June 20, 2019
Filing Date:
May 16, 2018
Export Citation:
Assignee:
ZHEJIANG SUNNY OPTICAL CO LTD (CN)
International Classes:
G02B9/12; G02B11/08; G02B13/00; G03B21/14
Domestic Patent References:
| WO1998052076A1 | 1998-11-19 |
Foreign References:
| CN107861316A | 2018-03-30 | |||
| CN107505689A | 2017-12-22 | |||
| CN1189222A | 1998-07-29 | |||
| CN85109241A | 1986-07-09 | |||
| CN205880337U | 2017-01-11 | |||
| CN102707412A | 2012-10-03 | |||
| JPH05145873A | 1993-06-11 | |||
| JP2014109741A | 2014-06-12 |
Attorney, Agent or Firm:
INSIGHT INTELLECTUAL PROPERTY LIMITED (CN)
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