Optical device for scanning an optical record carrier

Details Optical device for scanning an optical record carrier Optical device for scanning an optical record carrier

2007-05-15

2007-05-15

Chang, Audrey (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S571000, C359S572000, C369S112050, C369S112030

Reexamination Certificate

active

10498950

ABSTRACT:
An optical device for scanning an optical record carrier (20) has a radiation source (25) that can emit two radiation beams of different wavelength along different optical paths (28, 29). The emitted radiation is focused on the record carrier and reflected back to a detection system (40). A beam combiner43is arranged in the optical path between the radiation source and the detection system for combining the two radiation beams on one optical path, thereby allowing the use of a single detection system for both radiation beams. The beam combiner includes a grating that passes one of the beams undiffracted and diffracts the other beam mainly in the first order. The profile of the grating lines show alternating slanting grooves and slanting lands.

REFERENCES:
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 2001/0021163 (2001-09-01), Yukawa

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