Optical scan device having an optical diffraction grating elemen

Details Optical scan device having an optical diffraction grating elemen Optical scan device having an optical diffraction grating elemen

1993-08-31

1995-06-27

Shafer, Ricky

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359209, 359569, 359575, 369109, G02B 518, G02B 2744

Patent

active

054284724

ABSTRACT:
An optical scan device comprising a light source and an optical diffraction grating element movable relatively to the light source, which is designed to substantially linearly scan a recording medium in a predetermined direction with a uniform light amount of a light beam emitted from the light source as the optical diffraction grating element moves relatively to the light source. The optical diffraction grating element comprising 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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