Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-08-22
1992-08-04
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359219, 346108, 358296, G02B 2610
Patent
active
051364166
ABSTRACT:
In an optical unit for a laser beam printer, a laser beam generated by a laser diode is converted by a group of conversion lenses into a laser beam having a cross section of predetermined-size. The laser beam is directed toward a photosensitive body by a scanner, so as to scan the photosensitive body at a nonuniform speed. A focusing lens focuses the laser beam on the surface of the photosensitive body. The conversion lenses includes at least one aspheric-surface glass lens. The reflecting faces of the scanner are convex and are so formed as to satisfy the inequality R/Z<0.5, where R is the maximum radius of curvature with respect to a main scanning direction, and Z is the shortest distance between a point of reflection (or a point of deflection) and an object to be scanned. The focusing lens is an aspheric-surface lens having a toric surface which is rotation-symmetric with reference to an axis extending in the main scanning direction.
REFERENCES:
patent: 4297713 (1981-10-01), Ichikawa et al.
patent: 4627685 (1986-12-01), Sakuma
patent: 4758059 (1988-07-01), Sakuma
patent: 4818046 (1989-04-01), Kondo
patent: 4875748 (1989-10-01), Matsumoto et al.
Ben Loha
Kabushiki Kaisha Toshiba
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