Disc dishing measurement method and apparatus

Details Disc dishing measurement method and apparatus Disc dishing measurement method and apparatus

1997-05-28

1999-11-09

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system

Dimensional determination

702155, G01B 1124

Patent

active

059831677

ABSTRACT:
A method for measuring dishing in discs, including the steps of irradiating a laser beam along a scanning line which spirals from an inner side to an outer side of a surface of a magneto-optical disc or a digital video disc; determining a tilt angle at each of a plurality of measurement points on the scanning line based on displacement of a reflected laser beam from a normal reflected position; and using a measurement point on a first circuit on the inner side of the scanning line as a reference to determine dishing amounts at corresponding measurement points on circuits after the first circuit based on the tilt angles.

REFERENCES:
patent: 5540967 (1996-07-01), Toide et al.
patent: 5646415 (1997-07-01), Yanagisawa
patent: 5684778 (1997-11-01), Yamada et al.
patent: 5726969 (1998-03-01), Moriya et al.
patent: 5815255 (1998-09-01), Van Ochten et al.

Affiliated with

Also associated with

Rating

Disc dishing measurement method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc dishing measurement method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc dishing measurement method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1469320