Integrated optical pick-up device

Details Integrated optical pick-up device Integrated optical pick-up device

1991-09-11

1992-04-21

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4412, G11B 700

Patent

active

051074770

ABSTRACT:
An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or integrated in a single element to reduce the total number of separate optical elements provided in the device. In particular, use is made of a diffraction grating rather than lenses and/or lenses are formed as holo lenses. A diffraction grating and a holo lens may be formed substantially in the shape of flat plates, so that many optical components can be put together to define an integrated subassembly, which reduces the total number of discrete elements, facilitates manufacturing and eliminates the necessity of adjustments among optical elements once set.

REFERENCES:
patent: 4694443 (1987-09-01), Ando
patent: 4817074 (1989-03-01), Yamanaka
patent: 4873678 (1989-10-01), Nakamura et al.
patent: 4945529 (1990-07-01), Ono et al.

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