Optical head with diffraction grating producing five diffracted

Details Optical head with diffraction grating producing five diffracted Optical head with diffraction grating producing five diffracted

1992-10-29

1993-12-14

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4442, 369112, 369120, G11B 7135

Patent

active

052709965

ABSTRACT:
An optical head comprises a grating lens for diffracting light beam separated from the light beam path. The grating lens is composed of a plurality of regions having different focal length and diffraction direction so that the light beam is divided into a predetermined number of light beams. Therefore, a conventional beam splitter or polarizing beam splitter is replaced by a grating lens so that the optical head can be smaller and lighter, and the precision of detecting a track and focus errors is improved.

REFERENCES:
patent: 4504938 (1985-03-01), Tajima
patent: 4507772 (1985-03-01), Yamamoto
patent: 4513408 (1985-04-01), Nomura et al.
patent: 4525825 (1985-06-01), Ito et al.
patent: 4665310 (1987-05-01), Heemskerk
patent: 4720825 (1988-01-01), Kokado
patent: 4730295 (1988-03-01), Bressers
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4768183 (1988-08-01), Ohnishi et al.
patent: 4771411 (1988-09-01), Greve
patent: 4783589 (1988-11-01), Ando
patent: 4817074 (1989-03-01), Yamanaka
patent: 4885734 (1989-12-01), Yuzo
patent: 4945529 (1990-07-01), Ono et al.
Y. Togami, "Magneto-Optic Disk Storage", IEEE Trans. on Magnetics, vol. MAG-18, No. 6, Nov. 1982, pp. 1233-1237.
Y. Nagao et al, "Dynamic Recording and Readout . . . Exerciser", Japanese Journal of Applied Physics, vol. 21, No. 8, Aug. 1982, pp. L509-L511.
Bulthuis et al, "Ten billion bits on a disk", IEEE Spectrum, Aug. 1979, pp. 26-33.
J. Heemskerk, "Noise in a video disk system . . . laser", Applied Optics, vol. 17, No. 13, Jul. 1, 1978, pp. 2007-2012.

Affiliated with

Also associated with

Rating

Optical head with diffraction grating producing five diffracted does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical head with diffraction grating producing five diffracted , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head with diffraction grating producing five diffracted will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1711904