Reduction of tracking offset in split-type pickup head of a           magneto-optical disk drive

Jau-Jiu Ju; Gin-Kan Wang; Jang-Jong Bian; KuenJin Lee

doi:10.1117/12.131335

28 October 1992 Reduction of tracking offset in split-type pickup head of a magneto-optical disk drive

Jau-Jiu Ju, Gin-Kan Wang, Jang-Jong Bian, KuenJin Lee

Proceedings Volume 1816, Electro-Optic Computer Peripherals Technology; (1992) https://doi.org/10.1117/12.131335
Event: International Symposium on Optoelectronics in Computers, Communications, and Control, 1992, Hsinchu, Taiwan

Abstract

In the optical system of a split type magneto-optical disk drive, the most serious problem is that optical axis tilt and position shift of the moving part could induce large tracking offset. In this research, a mask is used to confine the beam reflected from the disk, such that focus and tracking error signal can be modified. In this way, tracking error signal drift caused by the actuator, while track following, can be decreased. In addition, the DC tracking offset of the moving part, while moving along the guide rod, can be reduced. Crosstalk between tracking and focus signal also can be lowered. In this paper, the optical system simulated by ray tracing and the design of the mask are studied. The test results of the system show that the mask can successfully decrease the tracking offset caused by optical axis tilt and position shift of the moving part.

Citation Download Citation

Jau-Jiu Ju, Gin-Kan Wang, Jang-Jong Bian, and KuenJin Lee "Reduction of tracking offset in split-type pickup head of a magneto-optical disk drive", Proc. SPIE 1816, Electro-Optic Computer Peripherals Technology, (28 October 1992); https://doi.org/10.1117/12.131335

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