Monolithic optical pick-up using an optical waveguide

Details Monolithic optical pick-up using an optical waveguide Monolithic optical pick-up using an optical waveguide

1987-09-04

1989-10-24

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 45, 369112, G11B 712, G11B 7135

Patent

active

048766801

ABSTRACT:
An optical pick-up for use in an optically information recording and reproducing apparatus is provided. The pick-up includes a substrate on which an optical waveguide layer is formed and a grating coupler is formed on the optical waveguide layer. Photosensors are also provided to receive light travelling along the waveguide from the grating coupler. A beam splitter is also formed on the substrate for splitting the light from the grating coupler into two separate light beams before reception by the photosensors. If the substrate is opaque, the substrate is formed with an opening through which light emitted from a light source passes. An objective lens is also provided for focusing the light emitted from the light source onto the information recording surface of an optical disc. A quarter wavelength plate may also be provided to change the nature of polarization of the light used.

REFERENCES:
patent: 4716559 (1987-12-01), Hine
patent: 4760568 (1988-07-01), Hine
Ura et al., An Integrated-Optic Disk Pickup Device, May 1986, pp. 92-100, Electronics and Communications in Japan, Part 2, vol. 70, No. 2, .COPYRGT. 1987, Scripta Technica, Inc.
Takizawa, Electrooptic Fresnel Lens-Scanner With An Array Of Channel Waveguides, Applied Optics, vol. 22, No. 16, Aug. 15, 1983.

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