| 发明名称 | Projection-type video display apparatus having a transmission-type screen | ||
| 摘要 | A projection-type video display apparatus comprising: a transmission-type screen; a video projection unit configured to project an image displayed on a video display surface as an image light; a projection optic system configured to enlarge and project the image light projected from said video projection unit on a rear surface of said transmission-type screen; and a plane mirror, provided in a part of said projection optic system, configured to reflect the image light from said video projection unit, thereby to project it on said transmission-type screen, wherein said transmission-type screen, said video projection unit and said projection optic system are mounted on a base; said video projection unit builds up an oblique projection optic system; and said transmission-type screen and said plane mirror are disposed on said base, being perpendicularly fixed, independently, in parallel with each other, and on the rear surface of said transmission-type screen is attached a foldable back cover, detachably, so as to cover a rear surface of said plane mirror. | ||
| 申请公布号 | US9217915(B2) | 申请公布日期 | 2015.12.22 |
| 申请号 | US201013818052 | 申请日期 | 2010.09.30 |
| 申请人 | Hitachi Maxell, Ltd. | 发明人 | Hirata Koji;Matsuzawa Toshihiko;Sato Tadashi |
| 分类号 | G03B21/28;G03B21/30;H04N1/00;H04N1/10;G02B27/28;G03B21/10;G03B21/62;H04N9/31;G02B3/08 | 主分类号 | G03B21/28 |
| 代理机构 | Foley & Lardner LLP | 代理人 | Foley & Lardner LLP |
| 主权项 | 1. A projection-type video display apparatus, comprising: a transmission-type screen; a video projection unit, which is configured to project an image displayed on a video display surface as an image light; a projection optic system, which is configured to enlarge and project the image light projected from said video projection unit on a rear surface of said transmission-type screen; and a plane mirror, which is provided in a part of said projection optic system, and which is configured to reflect the image light from said video projection unit, thereby to project it on said transmission-type screen, wherein said transmission-type screen, said video projection unit and said projection optic system are mounted on a base; said video projection unit builds up an oblique projection optic system; and said transmission-type screen and said plane mirror are disposed on said base, being perpendicularly fixed, independently, in parallel with each other, and on the rear surface of said transmission-type screen is attached a foldable back cover, detachably, so as to cover a rear surface of said plane mirror. | ||
| 地址 | Ibaraki-shi JP | ||