Optical element and optical pickup device comprising it

Details Optical element and optical pickup device comprising it Optical element and optical pickup device comprising it

G - Physics

11

B

352/53.7

G11B 7/12 (2006.01) G02B 5/18 (2006.01) G11B 7/135 (2006.01) G11B 11/105 (2006.01)

Patent

CA 2013538

An optical element comprises a grating having a grating pitch which is approximately equal to the wavelength of an incident light, is formed on a transparent base. The optical pickup device comprising the optical element includes a polarized light detecting unit provided with a diffraction grating having a grating pitch which is approximately equal to the wavelength of an incident light. The diffraction grating is formed on a transparent substrate, and splits the incident light into two polarized lights having mutually orthogonal polarizations. A first photodetector is mounted integrally and virtually in parallel with the substrate, for receiving a zeroth-order diffracted light produced by the diffraction grating, and a second photodetector is located in the same plane as the first photodetector and mounted integrally with the first photodetector and the substrate, for receiving a first- order diffracted light produced by the diffraction grating.

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