Title:
天井照射窓
Document Type and Number:
Japanese Patent JP7009304
Kind Code:
B2
Abstract:
A ceiling illumination window is provided with a transparent prism, and a reflecting member provided on a second edge of the transparent prism. Further, the transparent prism is installed in such a way as to enable light incident thereon at an angle, relative to a normal line to first and second transparent plates, that is at least equal to a prescribed angle to be reflected at a third edge using a critical angle. In addition, when light is incident at an angle at least equal to the prescribed angle relative to the normal line, the transparent prism emits the light toward an indoor ceiling side using at least two types of optical path having different numbers of reflections, using reflection at least one of the transparent prism surface and the reflecting member, and when light is incident at an angle less than the prescribed angle, the transparent prism allows the light to be transmitted through the third edge.
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Inventors:
Takuki Nakamura
Application Number:
JP2018094215A
Publication Date:
January 25, 2022
Filing Date:
May 16, 2018
Export Citation:
Assignee:
Yazaki Energy System Co., Ltd.
International Classes:
E06B5/00; F21S11/00; F21V5/02; F21V7/05; F21V13/04; G02B5/00; G02B5/04
Domestic Patent References:
| JP20044734A | ||||
| JP201380142A | ||||
| JP6215376B2 |
Attorney, Agent or Firm:
Nobuo Nakamura
Shoichi Masuto
Shoichi Masuto