G - Physics – 11 – B
Patent
G - Physics
11
B
349/56, 352/32.2
G11B 7/00 (2006.01) G11B 7/0025 (2006.01) G11B 7/125 (2006.01) H04N 1/036 (2006.01) H04N 1/113 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1138107
ABSTRACT OF THE DISCLOSURE An optical data recording system in which during recording the image of the acoustic pulse at the writing surface is made to move at the same relative velocity with respect to the recording medium whereby motion blur is minimized or reduced. The writing beam, such as that generated by a laser, is incident on acousto-optic device (such as a Bragg cell) and may be diffracted (deflected) at an angle determined by the frequency of a source applied to the device. By selecting the system magnification between the device and the recording medium such that the magnification, in one embodiment, is substantially equal to the ratio of the velocity of the recording medium, to the velocity of the sound wave in the acousto-optic device, the image of the acoustic pulse follows the surface of the recording medium and permits imaging of the video signal to the recording medium without blurring. In a second embodiment wherein the writing beam is scanned across the surface of the recording medium, the system magnification is selected to be substantially equal to the ratio of the velocity of the writing beam to the velocity of the sound wave in the acousto-optic device.
324980
Sim & Mcburney
Xerox Corporation
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