Clamper magnetism test method for a tray-type optical drive

Details Clamper magnetism test method for a tray-type optical drive Clamper magnetism test method for a tray-type optical drive

2004-07-14

2008-03-25

Bost, Dwayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Having abnormality condition indicating

C369S053380, C369S053390, C369S053430

Reexamination Certificate

active

07349313

ABSTRACT:
A magnetism test method for a tray-type optical drive is disclosed. A preliminary input voltage is provided to a DC motor of the tray-type optical drive for performing a preliminary ejection on a tray and a magnetic clamper of the tray-type optical drive. Then, a test voltage smaller than the preliminary input voltage is provided to the DC motor to partially eject the tray, in which the tray is ejected to a point short of the complete distance of ejection. When the incomplete distance is longer than a predetermined distance, the magnetic force of the magnetic clamper is determined to abnormal.

REFERENCES:
patent: 4902971 (1990-02-01), Guzik et al.
patent: 7086068 (2006-08-01), Inoue
patent: 2002/0172126 (2002-11-01), Liao et al.
patent: 2005/0259533 (2005-11-01), Sakagami
patent: 1577560 (2005-02-01), None

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