| 摘要 |
A servo track writing apparatus (10) for writing servo tracks (16) on a media disk (14) of a disk drive assembly (12) having a Positioning arm (22) with a through hole (28) therein. The writing apparatus (10) has a laser source (29) which directs a source beam (30) through a polarizing beam splitter (32) and a quarter-wave plate (34) to either pass through the through hole (28) and reflect off of the media disk (14) as a reflected beam (38), or to be reflected from regions of the positioning arm (22) proximate to the through hole (28) as a reflected beam (56). The writing apparatus (10) further has a remote tracking arm (42) with two photodiodes (40a, 40b) suitably mounted thereon to receive the reflected beams (38, 56). The tracking arm (42) is caused by a motive means (54) to precisely track the positioning arm (22) of the disk drive assembly (12). A laser interferometer (58) is then used to detect an optical target (60) mounted on the tracking arm (42) and determine positioning for writing of the servo track (16).
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