| 摘要 |
PURPOSE:To improve the recording speed by focusing and irradiating successively the laser beam onto an information recording medium through respective lenses and forming a bit column approximately in the circular arc shape, while accompanying the rotation of a rotary plate arranged with plural lenses. CONSTITUTION:While a card C is shifted in the (y) direction of an arrow, the rotary plate 2 is rotated at the constant speed, a laser beam L is irradiated at the prescribed area on the rotary plate 2 from a laser light source and the laser beam passing through a hologram lens 3 is converged onto the information recording media M. When the rotary plate 2 is rotated in the A direction while the laser beam L is irradiated to an area R, a laser beam spot Sa is taken off from the information recording media M, simultaneously, a next laser optical beam spot Sb enters and when the laser beam spot Sb is taken off and the next laser beam spot enters again. By repeating this, the information recording medium M in progress can be scanned successively while approximately the circular arc is drawn by the laser optical spot, during this, the laser beam is turned on and off, and the binarization information is recorded at the information recording medium M in a pit shape. Thus, the writing speed of the information is further improved. |
