More and more DVD burners entry to common people\'s family as the kind of digital products,an increasing number of users set a higher request to this kind of digit product\'s GUI,they hope to see a both gorgeous appearance and easy-to-use GUI only the PC machine has.

DVD disc recorder is a kind of recorder by disc as memory medium with high consistency and capacity, fulfilling the high fidelity of the picture and timbre and with the functions of program playing, forward playing, backward playing, repeat and skip playing, etc.

The radial and tangential tilt angles between the emission laser axis of objective lens and test disc are the key parameters to develop,produce and detect the DVD traverses.