Optical disk identifying method in optical disk reading/recording system

Abstract

The method includes: checking-up already updated recognition time in advance; deciding one item as recognition time from a determined recognition time or updated recognition time; emitting laser light, determining time from surface to recording face; comparing measured time with decided recognition time to recognize whether the optical disk is DVD or CD; if it is DVD, then reading ID; if it is CD; then reading Sub-Q; if reading operation is failure; then setting up recognition error sign as 1; DVD is forced to be recognized as CD, and CD is forced to be recognized as DVD, then reading operation is carried out repeatedly; if reading is successful, then the error sign of searching recognition is not as 1, then finishing preparation of reading / recording; if the error sign of searching recognition is as 1, then reduced or increased recognition time is updated and stored, and preparation of reading / recording is ended. The invention raises accuracy and speed for recognizing CD or DVD.

Description

(1) Technical field [0001] The invention relates to an optical disc reading / recording system, in particular to an optical disc identification method in an optical disc reading / recording system for identifying CD and DVD optical discs. (2) Background technology [0002] Optical disc reading / recording systems generally include CD and DVD. Since these CDs and DVDs use lasers of different wavelengths from each other, CDs cannot be read with a DVD laser, and DVDs cannot be read with a CD laser. [0003] Therefore, existing CDs can only be read in CD players, and existing DVDs can only be read in DVD players. [0004] In addition, the recently developed optical disc reading / recording system recognizes CDs and DVDs with different recording densities at the beginning of reading, and reads them with laser light of the corresponding wavelength, so that CDs and DVDs can be read with one device. [0005] The method for identifying CD and DVD by the above optical disc reading / recording...

AI Technical Summary

Problems solved by technology

[0049] One is that whenever a disc is recognized, a recognition error occurs and it is required to re-recognize the CD / DVD forcibly, so the recognition time will be extended to 2 times;

[0050] The second is that when you want to use a DVD laser to start a CD server, or when you want to use a CD laser to start a DVD server, the focus and tracking servo will become unstable, and the situations of inconsistent focus or discontinuous tracking will occur one after another

In this case, the unstable state of the focus drive leads to high-temperature heat generation, which has a great negative effect on the uniform heat of the optical head coating, etc., which will shorten the life of the machine

Images