Beam-shaping device, optical disc device, and fabrication...

Details Beam-shaping device, optical disc device, and fabrication... Beam-shaping device, optical disc device, and fabrication...

2005-05-24

2005-05-24

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

Reexamination Certificate

active

06898010

ABSTRACT:
The present invention provides the beam-shaping device which includes a first surface on which is formed a first grating through which a beam of light emitted from a light source on an optical axis passes; and a second surface on which is formed a second grating through which the beam of light having passed through the first surface passes; wherein the first grating and the second grating are designed, so as to maintain, when the wavelength of the emitted beam of light varies, a prescribed relationship between (1) the displacement of the first virtual light emitting point, in the first meridian plane containing the optical axis, and (2) the displacement of the second virtual light emitting point, in the second meridian plane perpendicular to the first meridian plane containing the optical axis.

REFERENCES:
patent: 5068751 (1991-11-01), Braat et al.
patent: 5237451 (1993-08-01), Saxe
patent: 6108138 (2000-08-01), Ophey et al.
patent: 6128134 (2000-10-01), Feldman et al.
patent: 6272098 (2001-08-01), Takahashi et al.
patent: 11-232685 (1999-08-01), None
Kato et al. “Wavelength Independent Grating Lens System”, Applied Optics, vol. 28, No. 4 (Feb. 15, 1989), pp. 682-686.

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