Patent ID: 8134900
Filing Date: 2012-03-13
Classification: G11B

Abstract:
1. A recording and reproducing apparatus comprising: optical head means for writing and reading information expressed by a mark and a space on an optical recording medium by irradiating laser light to the optical recording medium; laser-driving pulse generating means for creating and supplying a laser-driving pulse in accordance with information to write to the optical head means and causing the optical head means to perform the irradiation of laser light for writing; mark edge error detecting means for detecting a mark edge position error (m) from a signal read out from the optical recording medium by the optical head means; and adjustment control means for defining an adjustment on a laser-driving pulse generated by the laser-driving pulse generating means, wherein q is a variable, a relationship between the mark edge position error (m) and an amount of shift of a write edge position (w) is linear, a relationship between types of the write edge positions (w) and types of the mark edge position errors (m) is linear, the adjustment control means performs a writing operation, by using the optical head means, for at least q+1 strategy adjustments (ST) on the optical recording medium for a set amount of shift of each write edge position (w) to determine at least q+1 of the amounts of shifts of the write edge positions (w) for q types of write edge positions (w) to be adjusted by the laser-driving pulse, obtains at least q+1 of the mark edge position errors (m), which are detected by the mark edge error detecting means when information written with the set amount of shift of each write edge position (w) defined in the writing operation is read out by the optical head means, determines a setting for adjustment on the laser-driving pulse by calculating the amounts of shifts of the write edge positions (w) for q types of the write edge positions (w) to minimize a square sum of q types of the mark edge position errors (m) detected by the mark edge error detecting means, and defines the setting in the laser-driving pulse generating means.