| 发明名称 |
PROJECTION OPTICAL APPARATUS AND IMAGE PROJECTION APPARATUS |
| 摘要 |
A disclosed projection optical apparatus includes a plurality of lenses, each of the lenses having a flat surface in a part of an outer circumference; a lens holder having a hollow cylindrical shape and configured to hold the lenses; and a vent hole formed of gaps communicating between the flat surfaces of the lenses and the lens holder. |
| 申请公布号 |
US2016062075(A1) |
申请公布日期 |
2016.03.03 |
| 申请号 |
US201514837379 |
申请日期 |
2015.08.27 |
| 申请人 |
MATSUYAMA Toshinobu |
发明人 |
MATSUYAMA Toshinobu |
| 分类号 |
G02B7/02;G03B21/00;G03B21/16 |
主分类号 |
G02B7/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A projection optical apparatus comprising:
a plurality of lenses, each of the lenses having a flat surface in a part of an outer circumference; a lens holder having a hollow cylindrical shape and configured to hold the lenses; and a vent hole formed of gaps communicating between the flat surfaces of the lenses and the lens holder. |
| 地址 |
Kanagawa JP |
