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

1996-10-09

1999-11-30

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359210, 359212, 359216, 359824, 369 4414, G02B 2608

Patent

active

059952695

ABSTRACT:
An optical unit for optically scanning a surface, particularly an information surface of a recording medium. The unit may include a frame, a radiation source unit, a rotatable mirror unit, and an objective system for forming a scanning spot on the information surface. The objective system has an entrance pupil and an optical axis. 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. Alternatively, the optical unit may include an optical beam deflection unit. In this embodiment and from an optical point of view, the deflection unit is situated between the radiation source unit and the objective system and the suspension means allow a pivotal movement of the objective system about a pivot which at least coincides with the point of intersection.

REFERENCES:
patent: 4773055 (1988-09-01), Gijzen et al.
patent: 4901297 (1990-02-01), Komatsu et al.
patent: 5253245 (1993-10-01), Rabedeau
patent: 5263013 (1993-11-01), Kang
patent: 5661704 (1997-08-01), Van Rosmalen
"The Optical Industry & Systems Directory", 1972-1973, 19th Edition, pp. G-6, G-7, G-27 (No Month).

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