Back to results
US 2008/0062840 A1Published application
Method and apparatus for detecting optical disk type
AssigneesMatsushita Electric Industrial Co., Ltd., Panasonic Semiconductor Asia Pte., Ltd.
InventorsKim Hee NG, Norio HATANAKA
Life of this patent
Estimating the term…
Abstract
A method to determine the diameter and shape of the loaded optical disk without any additional sensor. By accelerating a disk for a certain period of time and then monitoring the rotational speed before the spindle lock, the diameter and shape of the loaded optical disk is detected.
Claims22
A method for detecting a disk size of an optical disk mounted on a spindle, comprising:
- accelerating the optical disk on the spindle for a predetermined period of time;
- detecting a speed of a disk by using a data clock signal produced by reading data on the disk after said accelerating;
- comparing the disk speed with a predetermined speed;
- and
- detecting the disk size by a result of the comparison.
2 more elements
An apparatus for detecting a disk size of an optical disk mounted on a spindle, comprising:
- an accelerating device operable to accelerate the optical disk on the spindle for a predetermined period of time;
- a first detecting device operable to detect a speed of a disk by using a data clock signal produced by reading data on the disk after accelerating;
- a comparing device operable to compare the disk speed with a predetermined speed;
- and
- a second detecting device operable to detect the disk size by a result of the comparison.
2 more elements
Dependencies are inferred from the claim text.