Method for calibrating focus level on a light scribe disc

Details Method for calibrating focus level on a light scribe disc Method for calibrating focus level on a light scribe disc

2011-03-29

2011-03-29

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S221000

Reexamination Certificate

active

07915569

ABSTRACT:
A method for calibrating a focus level on a light scribe disc includes driving a pick-up head with a predetermined speed in a predetermined direction to calibrate a focus level for a moving stage, detecting light summed signals along the light path of the moving stage, and finding and recording the maximum light summed signal and corresponding position of the pick-up head as the focus level for the moving stage. When a number of the moving stages is greater than a predetermined value, the focus level of the moving stage serves as the optimum focus level of the light scribe disc. When the number of moving stages is fewer, lowering the speed with a stage reduction and change the direction opposite to the predetermined direction, and proceeding to a next moving stage to calibrate the focus level.

REFERENCES:
patent: 5999503 (1999-12-01), Tateishi et al.
patent: 7087894 (2006-08-01), Kinoshita et al.
patent: 7145842 (2006-12-01), Kobayashi
patent: 2008/0074977 (2008-03-01), Mizuno
patent: 2008/0298181 (2008-12-01), Ueno et al.

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