Optical pick-up device having an optical diffraction grating ele

Details Optical pick-up device having an optical diffraction grating ele Optical pick-up device having an optical diffraction grating ele

1993-08-31

1995-08-08

Shafer, Ricky D.

Optical: systems and elements

Diffraction

From grating

359569, 359575, 369109, 369112, 250237G, G02B 518, G02B 2744

Patent

active

054404274

ABSTRACT:
An optical pick-up device comprising an optical system including a light source and an optical diffraction grating element and a light receiving element, wherein the optical diffraction grating element guides the 0th-order diffracted lights of a light beam emitted from the light source onto a recording medium and guides the first-order diffracted lights of a reflected light from the recording medium onto the light receiving element to produce a plurality of focused light spots having the same light amount, wherein the optical diffraction grating element includes diffraction gratings having a configuration in which grooves and flat lands each positioned between the adjacent grooves are successively alternately formed, wherein the diffraction gratings have the same groove depth, groove width and groove tilt angle in order to obtain a constant 0th-order diffraction efficiency and first-order diffraction efficiency in the optical diffraction grating element while the pitches of the diffraction gratings are made different by setting a different land width for each diffraction grating.

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