Optical device for projecting a radiation beam onto a data...

Details Optical device for projecting a radiation beam onto a data... Optical device for projecting a radiation beam onto a data...

H - Electricity

04

N

343/4, 352/32.21

H04N 5/76 (2006.01) G11B 7/00 (2006.01) G11B 7/135 (2006.01)

Patent

CA 1067999

Abstract of the Disclosure 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 inser- ting 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.

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