G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/12 (2006.01) G11B 7/0055 (2006.01) G11B 7/125 (2006.01)
Patent
CA 1243401
ABSTRACT OF THE DISCLOSURE An optical recording and reproducing apparatus having an erasing function provides a practical apparatus which can effect recording, reproducing and erasing of signals in an erasable recording film by applying laser beams thereto. A substantially circular first fine beam spot is formed by a beam source such as a laser, while an elliptical second beam spot for erasing purpose, having longer axis extending in a direction tangential to the guide track on the recording medium, is formed by another beam source such as a laser, so that both beam spots are disposed in close proximity of each other on the same guide track. The power of the intensity profile of the erasing beam spot is so controlled that the highest intensity is obtained in the leading end portion of the erasing beam spot as viewed in the direction of the scan, so that the signal can be erased stably and reliably with minimal erasing power. The portion of the recording medium scanned by the erasing beam spot is scanned by the recording beam spot so that the erasing and recording are carried out substantially simultaneously.
483074
O'hara Shunji
Yoshida Tomio
G. Ronald Bell & Associates
Matsushita Electric Industrial Co. Ltd.
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