Optical unit for optically scanning an information surface, and

Details Optical unit for optically scanning an information surface, and Optical unit for optically scanning an information surface, and

1995-12-04

1997-08-26

Huber, P. W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4422, 359824, G11B 700, G02B 702

Patent

active

056617046

ABSTRACT:
An optical unit (1) is provided for optically scanning a surface, particularly an information surface of a recording medium (9). The unit comprises a frame (13), a radiation source unit (15), a rotatable mirror unit (17), and an objective system (19) for forming a scanning spot on the information surface, which objective system has an entrance pupil (19b) and an optical axis (19a). From an optical point of view, the rotatable mirror unit is situated between the radiation source unit and the objective system, suspension means being provided for movably supporting the objective system relative to the frame. The suspension means allow a longitudinal movement of the objective system along the optical axis and a pivotal movement of the objective system about a pivot which coincides with the point of intersection of the optical axis and the entrance pupil. Actuating means drive the objective system in accordance with these movements.

REFERENCES:
patent: 4773055 (1988-09-01), Gijzen
patent: 4901297 (1990-02-01), Komatsu et al.
patent: 5263013 (1993-11-01), Kang
"The Optical Industry & Systems Directory", 1972-1973, 10th Edition; The International Encyclopedia of Optical, Electro-optical and Laser Technology, pp. 6;27 and 6;7, respectively.

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