Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-06-06
1996-03-26
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
359204, 359220, 359211, 358493, G11B 700, G02B 2608
Patent
active
055027091
ABSTRACT:
Parallel laser beams #1, #2 and #3 produced by splitting one laser beam into three, are introduced to an optical scanning device along the central axis of a recording cylinder, the optical scanning device being disposed on the central axis of the recording cylinder and rotated thereabout, having an inclined mirror surface, the recording cylinder holding a recording sheet on an interior surface thereof. The laser beam #2 incident upon the mirror surface at its center of rotation is reflected at the point of incidence, while the laser beams #1 and #3 are deflected by acousto-optical devices back and forth in the opposite directions in synchronism with the rotation of the optical scanning device, in parallel planes held at a distance and including the laser beams #1 and #3 therein, thereby to give the laser beams #1 and #3 angles of incidence upon the mirror surface necessary in order for the laser beams #1, #2 and #3 after reflected to produce scanned loci running parallel to each other at a given interval on the recording sheet, regardless of rotational positions of the optical scanning device. To adjust a relative difference in the lengths of the scanned loci, timing at which the laser beams #1, #2 and #3 are turned on/off is controlled. When the laser beams #1 and #3 are deflected so as to gyrate along a conical plane whose central axis is that of the recording cylinder, the laser beams #1, #2 and #3 produce scanned loci always running parallel to each other at a given interval with the same scanning lengths on the recording sheet.
REFERENCES:
patent: 4853709 (1989-08-01), Stein et al.
patent: 5026133 (1991-06-01), Roddy et al.
patent: 5097351 (1992-03-01), Kramer
patent: 5214528 (1993-05-01), Akanaba et al.
Ben Loha
Fuji Photo Film Co. , Ltd.
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