Optical head assembly

Details Optical head assembly Optical head assembly

1998-08-07

2000-09-26

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, G11B 700

Patent

active

061250929

ABSTRACT:
An optical assembly comprises a light emitting device and an objective lens for converging light emitted from the light emitting device onto an optical recording medium. A first diffraction grating is included in which a first grating pattern is formed for diffracting said light emitted from the light emitting device to guide it to the objective lens. Also included are a light receiving element and a second diffraction grating in which a second grating pattern is formed for diffracting returning light from the optical recording medium to guide it to the light receiving element. First alignment marks are provided to either the first or second grating for aligning the diffraction grating having the marks with another element.

REFERENCES:
patent: 5570333 (1996-10-01), Katayama
patent: 5579298 (1996-11-01), Opheij et al.
patent: 5594712 (1997-01-01), Yang

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