Optical: systems and elements – Diffraction – From grating
Patent
1997-04-23
2000-02-01
Epps, Georgia
Optical: systems and elements
Diffraction
From grating
G02B 532
Patent
active
060209992
ABSTRACT:
A high-resolution light-beam scanning apparatus utilizing only mass-producable holograms instead of utilizing auxiliary optical systems such as optical lenses or a mirror having curvature. The light beam scanning apparatus is 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 a rotatable hologram from a parallel state, which disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof. The light beam scanning apparatus incudes at least two holograms with an optical path length difference .DELTA..PHI.<(.lambda..sup.2 /D.lambda.) where < is a constant less than 0.5. The path length is related per the above equation to a wavelength, .lambda., at the center of the light surface, and a wavelength displacement .DELTA..lambda. measured from the wavelength .check mark. at the center of the light surface.
REFERENCES:
patent: 4118124 (1978-10-01), Matsuda
patent: 4378142 (1983-03-01), Ono
patent: 4428643 (1984-01-01), Kay
patent: 4505537 (1985-03-01), Funato
patent: 4712852 (1987-12-01), Funato et al.
patent: 4733253 (1988-03-01), Daniele
patent: 4737798 (1988-04-01), Lonis et al.
patent: 4776652 (1988-10-01), Ih
patent: 4810046 (1989-03-01), Yamagishi et al.
patent: 4925262 (1990-05-01), Yamagishi et al.
patent: 4948213 (1990-08-01), Hasegawa et al.
patent: 5039183 (1991-08-01), Meyers
patent: 5061025 (1991-10-01), Debesis
patent: 5157522 (1992-10-01), Markis
patent: 5172252 (1992-12-01), Toyoshima et al.
patent: 5182659 (1993-01-01), Clay et al.
patent: 5295004 (1994-03-01), Hasegawa et al.
patent: 5477348 (1995-12-01), Yamagishi et al.
patent: 5680232 (1997-10-01), Iwamatsu et al.
Communication in Corresponding European Application No. 92907344.3-2205, Aug. 12, 1997, six total pages.
Patent Abstracts of Japan, vol. 13, No. 197 (P-868) May 11, 1989 & JP-A-01 019 321 (NEC) Jan. 23, 1989.
International Search Report for corresponding PCT/JP92/00371, mailed Jun. 23, 1992.
European Search Report for corresponding European Patent Application No. 92 907344.3, dated Feb. 28, 1995.
European Search Report by corresponding European Patent Application Serial No. 92 907344.3, dated Apr. 6, 1994.
Aritake Hirokazu
Hasegawa Shin-ya
Kayashima Shigeo
Maeda Satoshi
Epps Georgia
Fujitsu Limited
Mack Ricky
LandOfFree
Light beam scanning apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light beam scanning apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light beam scanning apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-942352