Invention Grant
- Patent Title: Projection lens
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Application No.: US16303591Application Date: 2017-05-19
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Publication No.: US10942294B2Publication Date: 2021-03-09
- Inventor: Yoshihiro Nakano , Koji Takahara , Miyuki Teramoto
- Applicant: Konica Minolta, Inc.
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta, Inc.
- Current Assignee: Konica Minolta, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Osha Bergman Watanabe & Burton LLP
- Priority: JPJP2016-105391 20160526
- International Application: PCT/JP2017/018922 WO 20170519
- International Announcement: WO2017/204127 WO 20171130
- Main IPC: G02B21/00
- IPC: G02B21/00 ; G02B1/115 ; C03C17/34 ; G02B3/00 ; G03B21/14

Abstract:
A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third layer, fourth layer, fifth layer, sixth layer, seventh layer, and eighth layer. The first layer is formed of MgF2. Each of the second layer, the fourth layer, the sixth layer, and the eighth layer has a refractive index of 2.0 to 2.3. Each of the third layer, the fifth layer, and the seventh layer is formed of SiO2.
Public/Granted literature
- US20200319376A1 PROJECTION LENS Public/Granted day:2020-10-08
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