| 发明名称 |
Optical projector |
| 摘要 |
An aspheric element, placed near a principle plane of an wide-angle, wide-aperture image forming system and having in its aspheric function a term proportional to the third power of the distance from the optic axis improves off-axis revolution.
|
| 申请公布号 |
US4073574(A) |
申请公布日期 |
1978.02.14 |
| 申请号 |
US19760728508 |
申请日期 |
1976.10.01 |
| 申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
CLARKE, JOHN ALFRED;HOWDEN, HARRY |
| 分类号 |
G02B13/18;G02B27/18;(IPC1-7):G02B3/04;G02B17/08 |
主分类号 |
G02B13/18 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
