Optical Scanning Device

A method of operating an optical scanning device (1), the device comprising:

• a radiation source (7) for providing an incident radiation beam (4, 20) along a first optical path (19a) for scanning an information layer (2) of an optical record carrier (3);
• a detector (23) for detecting at least a portion of the radiation beam (22) reflected from the optical record carrier (3);
• a beam splitter (9) for transmitting the incident radiation beam (4) received from the radiation source along the first optical path (19a) towards the optical record carrier (3), and for transmitting said reflected beam (22) received from the optical record carrier (3) along a second, different optical path (19b) towards the detector (23);
• and a beam deflecting element (30;
• 130;
• 230;
• 330;
• 630;
• 830;
• 930) positioned on the second optical path (19b) between the beam splitter (9) and the detector (23), and arranged to controllably deflect the path of the reflected radiation beam (22) for adjusting the lateral position of said reflected radiation beam incident upon the detector (23) over a predetermined range,
• the method comprising controlling the deflection provided by said beam deflecting element (30;
• 130;
• 230;
• 330;
• 630;
• 830;
• 930) to the path of the reflected radiation beam (22), for providing the reflected radiation beam incident upon the detector (23) at a predetermined lateral position.

A method of manufacturing an optical scanning device (1), comprising:

• providing a radiation source (7) for providing an incident radiation beam (4, 20) along a first optical path (19a) for scanning an information layer (2) of an optical record carrier (3);
• providing a detector (23) for detecting at least a portion of the radiation beam (22) reflected from the optical record carrier (3);
• and
• providing a beam splitter (9) for transmitting the incident radiation beam (4) received from the radiation source along the first optical path (19a) towards the optical record carrier, and for transmitting said reflected beam (22) received from the optical record carrier (3) along a second, different optical path (19b) towards the detector;
• and
• providing a beam deflecting element (30;
• 130;
• 230;
• 330;
• 630;
• 830;
• 930) positioned on the second optical path (19b) between the beam splitter (9) and the detector (23), arranged to controllably deflect the path of the reflected radiation beam (22) for adjusting the lateral position of said reflected radiation beam incident upon the detector (23) over a predetermined range.