Method of discerning disc in compact disc drive

Details Method of discerning disc in compact disc drive Method of discerning disc in compact disc drive

1996-04-08

1997-07-01

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 50, 369190, 369239, G11B 2736

Patent

active

056445610

ABSTRACT:
A method of discerning an optical disk in a compact disk drive which includes the steps of moving an optical pick-up device to a table of contents (TOC) region of an optical disk to perform a focusing operation for reading data from the optical disk, and discerning whether an optical disk is loaded on a turntable of the compact disk drive. When the optical disk is loaded in the compact disk drive, the loaded optical disk is rotatably driven by a spindle motor. The time necessary for the rotating speed of the optical disk to reach a predetermined speed is counted, and the counted time is then compared with a predetermined time to determine whether the optical disk is one of a first type having, for example, a eight centimeters diameter and a second type having, for example, a twelve centimeters diameter. If the counted time is less than the predetermined time, the loaded optical disk is determined as a eight centimeters disk. If, on the other hand, the counted time is not less than the predetermined time, i.e., the counted time is equal or greater than the predetermined time, the loaded optical disk is determined as a twelve centimeters disk. According to the present invention, the size of a loaded optical disk is determined based on the recognition that the time necessary for the loaded optical disk to reach a normal rotating speed will differ depending on the weight and thereby the size of the loaded optical disk. This method will considerably reduce the time delay between the loading operation and playing operations.

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