Compact optical head

Details Compact optical head Compact optical head

1993-10-05

1994-07-19

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 359638, 359583, G11B 700

Patent

active

053316223

ABSTRACT:
A compact optical head for reading or writing data on an optical disc is disclosed wherein the optical head comprises an integrated laser diode/photodetector package, a half-cube beamsplitter, and an objective lens. Light emitted from a diode laser is in transmitted to the beamsplitter and deflected towards the objective lens. The objective lens focuses the incident light on a focal point on the surface of the disc. A reflected beam travels along the same path as the incident light and is deflected by the beamsplitter toward a photodetector contained in the integrated package, wherein the photodetector is displaced from the laser diode. Other embodiments of the beamsplitter are disclosed which include a wedged plate for transmitting collimated light emitted from the laser diode, and a cylindrical lens for introducing astigmatism into the reflected beam. The present invention provides a substantial reduction in the size and volume required by the optical head, advantageously allowing the head to be easily integrated with an actuator for focussing and tracking the incident beam on the disc.

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Yamanaka, et al., "Compact Magneto-Optical Disk Head Integrated with Chip Elements", Optical Data Storage Conference 1991 Technical Digest Series, vol. 5, pp. 138-141, Feb. 25-27, 1991.

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