Invention Grant
- Patent Title: Light reflecting film, and light controlling film, optical film, functional glass and head-up display including the light reflecting film
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Application No.: US15502899Application Date: 2015-10-08
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Publication No.: US10241241B2Publication Date: 2019-03-26
- Inventor: Kouichi Tanaka , Chihiro Takahashi , Yui Yokoyama , Tomoyuki Hayasaki
- Applicant: Nippon Kayaku Kabushiki Kaisha
- Applicant Address: JP Tokyo
- Assignee: NIPPON KAYAKU KABUSHIKI KAISHA
- Current Assignee: NIPPON KAYAKU KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Pearne & Gordon LLP
- Priority: JP2014-208512 20141010; JP2015-002740 20150109; JP2015-032042 20150220; JP2015-116369 20150609
- International Application: PCT/JP2015/078578 WO 20151008
- International Announcement: WO2016/056617 WO 20160414
- Main IPC: G02B5/30
- IPC: G02B5/30 ; G02B5/08 ; G02F1/1335 ; G02B5/26 ; G02B27/01 ; B60K35/00

Abstract:
A light controlling film comprises a light reflecting film and a light controlling layer that are laminated. The light reflecting film comprises at least two laminated light reflecting layers including at least one of light reflecting layers PRL-1 to PRL-3 that a central reflection wavelength of 400 nm-500 nm, 500 nm-600 nm, and 600 nm-700 nm, respectively, and a reflectance to ordinary light at the central reflection wavelength of 5%-25%. The at least two light reflecting layers have central reflection wavelengths that are different from each other. All of the at least two laminated light reflecting layers have a property of reflecting polarized light having the same orientation. The light controlling layer comprises two quarter wave plates, and the light reflecting film is laminated so as to be interposed between the two quarter wave plates.
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