Title:
PROJECTION LENS
Document Type and Number:
WIPO Patent Application WO/2019/210736
Kind Code:
A1
Abstract:
Provided is a projection lens. The projection lens comprises, from an imaging side to an image source side along an optical axis: a first lens (E1), a second lens (E2) and a third lens (E3). The first lens (E1) has a positive focal power; the second lens (E2) has a negative focal power, and a near imaging side surface thereof is a concave surface while a near image source side thereof is a convex surface; and the third lens (E3) has a positive focal power, and a near imaging side surface thereof is a convex surface. The total effective focal length f of the projection lens and the center thickness CT2 of the second lens (E2) on the optical axis satisfy 3.0 ≤ f/CT2 < 5.5.
Inventors:
YE LIHUI (CN)
LI MING (CN)
WENREN JIANKE (CN)
LI MING (CN)
WENREN JIANKE (CN)
Application Number:
PCT/CN2019/076959
Publication Date:
November 07, 2019
Filing Date:
March 05, 2019
Export Citation:
Assignee:
ZHEJIANG SUNNY OPTICAL CO LTD (CN)
International Classes:
G02B13/00; G02B13/06; G02B13/14
Foreign References:
| CN108427183A | 2018-08-21 | |||
| CN208297808U | 2018-12-28 | |||
| CN201993515U | 2011-09-28 | |||
| CN102621670A | 2012-08-01 | |||
| CN107505689A | 2017-12-22 | |||
| CN104391368A | 2015-03-04 | |||
| CN101276038A | 2008-10-01 | |||
| CN107092077A | 2017-08-25 | |||
| CN101226271A | 2008-07-23 | |||
| JP2014109741A | 2014-06-12 |
Attorney, Agent or Firm:
INSIGHT INTELLECTUAL PROPERTY LIMITED (CN)
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