Optical unit for use in a laser beam printer or the like

Details Optical unit for use in a laser beam printer or the like Optical unit for use in a laser beam printer or the like

1990-09-25

1992-03-10

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, 359196, 250236, G02B 2608

Patent

active

050953834

ABSTRACT:
In an optical unit incorporated in 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 predetermined-size cross section. The laser beam is directed toward a photosensitive body by a scanner unit, so as to scan the photosensitive body. A focusing lens allows the rotating angle of the reflecting faces of the scanner unit to correspond to a desirable point on the surface of the photosensitive body. In other words, the rotating angle is made to correspond to the distance between the optical axis center determined with respect to a main scanning direction and a point to which the laser beam is irradiated for scanning. Each of the reflecting faces is convex. The focusing lens is constituted by an aspheric-surface plastic lens having a toric surface which is rotation-symmetric with reference to an axis extending in the main scanning direction. The rotating speed of the convex mirrors of the scanner unit is determined in accordance with the characteristics of the focusing lens. Therefore, both the field curve and the f.theta. characteristic can be corrected.

REFERENCES:
patent: 3961838 (1976-06-01), Zanoni
patent: 4758059 (1988-07-01), Sakuma
patent: 4875748 (1989-10-01), Matsumoto et al.
patent: 4984857 (1991-01-01), Yeung et al.

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