Title:
投写レンズ系及び画像投写装置
Document Type and Number:
Japanese Patent JP7390671
Kind Code:
B2
Abstract:
A projection lens system that projects an image of a reduction side into a magnification side includes a diaphragm, a plurality of positive lenses, and a plurality of negative lenses. The plurality of positive lenses include a first positive lens closer to the magnification side than the diaphragm is and closest to the diaphragm, a second positive lens second closest to the diaphragm after the first positive lens on the magnification side, a third positive lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The plurality of negative lenses include a first negative lens closer to the magnification side than the diaphragm is and closest to the diaphragm, and a second negative lens closer to the reduction side than the diaphragm is and closest to the diaphragm. The lenses have transmittances larger than threshold values, respectively.
Inventors:
Takuya Imaoka
Hideo Ohnishi
Kenji Ikeo
Masaru Yamada
Hideo Ohnishi
Kenji Ikeo
Masaru Yamada
Application Number:
JP2022142261A
Publication Date:
December 04, 2023
Filing Date:
September 07, 2022
Export Citation:
Assignee:
Panasonic IP Management Co., Ltd.
International Classes:
G02B13/04; G02B13/16
Domestic Patent References:
| JP2016156986A | ||||
| JP2017102239A | ||||
| JP2010091751A | ||||
| JP2013531807A | ||||
| JP2013007881A |
Foreign References:
| WO2017195857A1 | ||||
| WO2009107553A1 |
Attorney, Agent or Firm:
Hiroshi Okabe
Hidetaka Okabe
Hiroshi Takeuchi
Hidetaka Okabe
Hiroshi Takeuchi