发明名称 |
Optical device for projecting a radiation beam onto a data carrier |
摘要 |
The invention relates to an optical reading device, for the read out of data carried by a reflecting support, wherein the source is a non-polarized laser of which the exit surface is reflective; the optical noise due to the reflection of the incident wave at the support is partially suppressed by inserting between the last partially polarizing and/or birefractive element and the data carrier a quarter wavelength plate which optically decouples the incident wave and the return wave. The optical noise is thus limited to the beats between the incident wave and the return wave reflected a second time by the support.
|
申请公布号 |
US4139263(A) |
申请公布日期 |
1979.02.13 |
申请号 |
US19760726474 |
申请日期 |
1976.09.24 |
申请人 |
THOMSON-BRANDT |
发明人 |
LEHUREAU, JEAN-CLAUDE;BRICOT, CLAUDE |
分类号 |
H04N5/85;G02B27/00;G11B7/135;(IPC1-7):G11C13/04;G11C7/02 |
主分类号 |
H04N5/85 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|