Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-04-04
1997-03-25
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369121, 369 4437, 369 97, G11B 700
Patent
active
056151985
ABSTRACT:
A first optical head comprising: a laser diode (LD) array, including N LDs having N emitting portions respectively arranged in a line at a predetermined interval, for emitting N laser beams of single mode; an optical system for forming a single spot as a pixel on a recording medium from the N laser beams such that images of the N emitting portions are contracted and overlapped each other; and a driver for driving the N LDs according to a single video signal. A second optical head comprising: M LD arrays, each including N LDs having N emitting portions respectively arranged in a line and emitting N laser beams of single mode from the N emitting portions; an optical system for forming M single spots as M pixels on a recording medium from the M of N laser beams such that images of the N emitting portions of each LD arrays are contracted and overlapped each other on the recording medium; and a driver for driving the M LD arrays according to M video signals respectively. Image recording apparatus having a scanning portion using the first or second optical head are also disclosed. In a third optical head, if some of LDs in one LD array deteriorates, a CPU increases drive current supplied to other LDs to compensate the output power. When the drive current exceed the maximum, the CPU stops the recording operation and indicates information.
REFERENCES:
patent: 4822151 (1989-04-01), Tatsuno et al.
patent: 5093822 (1992-03-01), Kugiya et al.
patent: 5128919 (1992-07-01), Narakara et al.
Ben Loha
Matsushita Graphic Communication Systems Inc.
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