Device for initializing an optical disc
AssigneeNEC Corporation
InventorTsutomu Matsui
Life of this patent
Estimating the term…
Abstract
A device capable of initializing an optical disc in high-speed and accurate manner includes a moving table (106) movable in the radius direction of a optical disc (101) to which first and second photo head moving sections (107) and (108) are fixed. A laser beam (131) emitted from a fixed section (105) is branched into two erasing beams through a beam splitter (136) and a reflection mirror (138), and the erasing beams are irradiated on the optical disc (101) from respective objective lenses (142) and (152). The erasing beam are of sizes that can erase a plurality of tracks simultaneously. The moving table (106) advances by a plurality of tracks to thereby initialize the plurality of tracks at once.
Claims7
A device for initializing an optical disc, comprising:
- a plurality of erasing beam irradiating means for irradiating an erasing beam onto a plurality of tracks at different positions on the optical disc simultaneously to erase information written in said plurality of tracks at once;
- moving means for moving said plurality of erasing beam irradiating means in a radius direction of the optical disc under a condition where erasing beams irradiated from said plurality of erasing beam irradiating means are irradiated onto the optical disc at given intervals;
- and
- control means for controlling said moving means to move said plurality of erasing beam irradiating means by a plurality of tracks.
Dependencies are inferred from the claim text.