Title:
【発明の名称】単一レーザ記録時直接再生システム(DRAW)
Document Type and Number:
Japanese Patent JP2795744
Kind Code:
B2
Abstract:
A single laser system utilizes a grating to provide a shifted beam and a nonshifted beam which are directed through a polarized beamsplitter in the nonsplitting direction. The beams are directed through a 1/4 wave plate by means of a folding mirror. The beams from the 1/4 wave plate are focused onto the recording surface to generate a write spot and a DRAW (direct read after write) spot. The DRAW spot is positioned behind the write spot at a distance of n+1/2 bits. Reflections from the DRAW spot are collimated back through the 1/4 wave plate onto the folding mirror. The folding mirror directs the collimated DRAW verify spot to the polarized beamsplitter where it is reflected through a lens to a DRAW spot photodetector for detection. In a like manner, read reflections are directed back to be focused on a read photodetector.
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Inventors:
BAANAADO JEEMUSU AASAA
Application Number:
JP50043490A
Publication Date:
September 10, 1998
Filing Date:
November 17, 1989
Export Citation:
Assignee:
IISUTOMAN KODATSUKU CO
International Classes:
G11B7/00; G11B7/004; G11B7/0045; G11B7/126; G11B7/1353; (IPC1-7): G11B7/00
Domestic Patent References:
| JP61153830A | ||||
| JP6292247A | ||||
| JP6047243A |
Attorney, Agent or Firm:
Takashi Ishida (3 others)