| 摘要 |
The invention relates to an optical device for scanning and/or creating an information track on an optical information carrier. The device comprises a radiation source and an optical unit with an objective lens for focusing a radiation beam originating from the radiation source on the information carrier. The optical unit comprises at least one optical component (1), which can be displaced in the direction of its optical axis (1a) and is mounted in a holder (5). The optical component is guided along a guide (11a, 11b, 12a, 12b), which is provided on a frame (4). According to the invention, the holder (5) comprises a bar-shaped guiding element (7), which extends in a direction parallel to the optical axis (1a) on both sides of the optical component (1), for displacing the optical component along the guide (11a, 11b, 12a, 12b) in order to set the optical component so as to extend in the direction of the optical axis. By virtue of said bar-shaped guiding element the optical component is accurately and stably positioned in the direction of the optical axis, and takes up only a limited amount of space.
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