Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1986-04-23
1988-10-18
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369122, 369 46, 350 9618, G11B 700, G11B 2110
Patent
active
047792590
ABSTRACT:
An optical IC-type head assembly for recording and for reading information on an optical disc, comprising a substrate, a light guiding layer comprising a dielectric thin film formed monolithically on the substrate, a laser oscillator for injecting the laser beam into the light guiding layer, a grating coupler for converging the laser beam on the optical disc, and a photo detector for receiving the beam reflected by the optical disc and coming out of the grating coupler. In one embodiment the substrate is made of material having cleavability. One side surface of the light guiding layer receiving the laser beam is a break surface formed by cleaving the substrate along the cleavage plane. The photo detector is disposed at the break surface of the light guiding layer. The substrate is preferably made of single crystal material. In another embodiment, a beam splitter is disposed between the laser oscillator and the grating coupler for splitting the reflected beam coming out of the grating coupler into two symmetrical beams. Each split beam forms an acute angle with respect to the optical axis of the reflected beam. The acute angle is preferably less than 30 degrees. The beam splitter may converge each of the split beams at a photo detecting element disposed between the laser oscillator and the grating coupler.
REFERENCES:
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4468084 (1984-08-01), Hutcheson et al.
Ura, Suhara, Nishihara & Koyama; "Focusing gratings for integrated optic disc pickup" IEEE Trans (C), J68-C, 10, pp. 803-811 (Oct. 1985).
Nishmara, Haruna, & Suhara; "Integrated optical circuits," Chap. 4 Ohm-sha 1985.
"An Integrated-Optic Disc Pickup Device"; Ura et al; Electronic Communications in Japan, part 2, vol. 70, No. 2, 1987 pp. 92-100.
U.S. Ser. No. 781993, Entitled Head Assembly for Optical Disc, filed Nov. 20, 1987.
Hine Shiro
Kondou Mitsushige
Kono Keizo
Nishihara Hiroshi
Suhara Toshiaki
Mitsubishi Denki & Kabushiki Kaisha
Psitos Aristotelis M.
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