| 发明名称 |
DIRECTIONAL OR REFLEXIVE PROJECTION SCREEN |
| 摘要 |
A directional or reflexive projection screen having a reflecting surface consisting of at least two or more kinds of glass beads having different refractive indexes. The optimum image viewing area may be arbitrarily adjusted.
|
| 申请公布号 |
US3639037(A) |
申请公布日期 |
1972.02.01 |
| 申请号 |
USD3639037 |
申请日期 |
1970.02.25 |
| 申请人 |
RICOH:KK. |
发明人 |
YOSHIO FUKUSHIMA |
| 分类号 |
G03B21/60;(IPC1-7):G03B21/60 |
主分类号 |
G03B21/60 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
