| 摘要 |
A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems such as optical lenses or a mirror having curvature, and capable of compensating for disadvantages including scanning beam thickening and variation, failure of a rotatable hologram to rotate at a constant velocity, displacement of a scanning beam position in the scanning direction and the cross scanning direction due to a mode hop of a wavelength of a semiconductor laser, and deviation of a base of rotatable hologram from a parallel state. These disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof. The light beam scanning apparatus includes at least two holograms, one rotatable and one fixed, wherein the fixed hologram plate has a phase distribution PHI H represented as a difference obtained when subtracting a reference wave phase PHI 0 from an object wave phase PHI R, where X is a scanning direction and Y is a cross scanning direction, C0, C1, C2, Y0, and Z0 are constants, where lambda 2 is a wavelength of said incident light; and lambda 1 is a wavelength of a constructing wave used for forming said fixed hologram plate.
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