Invention Grant
- Patent Title: Projection optical system and image projection apparatus including the same
- Patent Title (中): 投影光学系统和包括其的图像投影设备
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Application No.: US14811682Application Date: 2015-07-28
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Publication No.: US09594236B2Publication Date: 2017-03-14
- Inventor: Yusuke Akiyama
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Canon USA, Inc.
- Priority: JP2014-159211 20140805
- Main IPC: G02B15/14
- IPC: G02B15/14 ; G02F1/00 ; G02B15/177 ; G02B13/04 ; G02B13/16 ; G02B27/00
Abstract:
A projection optical system including a plurality of positive lenses and a plurality of negative lenses is provided. Values for an Abbe number and anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from an enlargement conjugate side and values for the Abbe number and the anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from a reduction conjugate side are appropriately set.
Public/Granted literature
- US20160041373A1 PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME Public/Granted day:2016-02-11
Information query
