Patent ID: 7532557
Filing Date: 2009-05-12
Classification: G11B

Abstract:
1. A recording pulse generating apparatus for generating recording pulse signals having pulse widths corresponding to pits having various lengths, comprising: a first pulse generating device which generates the recording pulse signal so that an amplitude of the recording pulse signal corresponding to a pit having length less than a preset length changes from a first amplitude which is an amplitude of front end of the recording pulse signal to a second amplitude which is lower than the first amplitude and is an amplitude of rear end of the recording pulse signal; and a second pulse generating device which generates the recording pulse signal so that an amplitude of the recording pulse signal corresponding to a pit having a length equal to or longer than the preset length changes from a third amplitude which is an amplitude of front end of the recording pulse signal to a fourth amplitude lower than the third amplitude, and further changes to a fifth amplitude which is higher than the fourth amplitude and is an amplitude of rear end of the recording pulse signal, wherein the first and second pulse generating devices generate the recording pulse signals so that the first and third amplitudes become equal to each other, and wherein the first pulse generating device generates the recording pulse signal so that the amplitude of the recording pulse signal corresponding to the other kind of pits having a length less than the preset length becomes a sixth amplitude.