Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-08-07
1997-08-19
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369119, 359206, 359216, G02B 2600, G11B 700
Patent
active
056595328
ABSTRACT:
An optical beam scanning apparatus comprises: an beam source emitting an optical beam; a deflector deflecting the optical beam around a center line with a deflection angle .theta. radians in a main scanning direction perpendicular to the center line at a constant angular velocity d.theta./dt; a lens system, having a focal length f in the main scanning direction, for focusing the optical beam on a recording plane perpendicular to the center line to form and scanning a beam spot on the recording plane at a constant speed in the main scanning direction, wherein the lens system refracts the optical beam from the deflection means such that the constant speed is larger than f.multidot.d.theta./dt. An emitting angle from the lens system is larger than the deflection angle by the deflector. The deflector comprises a polygon mirror unit. The lens system may have a function to compensate a surface inclination in the polygon mirror unit. That is, the lens system includes toric surfaces including at least a rotation symmetric aspheric surface and at least a spherical surface or one of the plurality refracting surfaces has a toric surface having an aspheric surface and other refracting surfaces have rotation symmetric aspheric surfaces. A collimating lens unit may be provided between the beam source and the deflector. Units necessary for recording data may be further provided.
REFERENCES:
patent: 5086350 (1992-02-01), Nishihata
patent: 5105296 (1992-04-01), Cho et al.
patent: 5179465 (1993-01-01), Kondo
patent: 5233455 (1993-08-01), Yamaguchi et al.
Gotou Yoshihiro
Kamioka Makoto
Chu Kim-Kwok
Epps Georgia Y.
Matsushita Electric - Industrial Co., Ltd.
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