Optical unit for use in laser beam printer or the like

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

1990-12-04

1992-07-28

Ben, Loha

Optical: systems and elements

Deflection using a moving element

359217, 250235, G02B 2610

Patent

active

051345110

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 rotataing 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. The conversion lenses include at least one aspheric glass lens. The conversion lenses further includes a pair of plastic lenses which have substantially the same power and opposite polarities with respect to either the main scanning direction or a subscanning direction. Among the lenses mentioned above, that lens which is located closest to the glass lens is integral with the laser diode. The focusing lens is formed of a material having substantially equivalent characteristics to those of the paired plastic lenses.

REFERENCES:
patent: 4171902 (1979-10-01), Imai et al.
patent: 4264120 (1981-04-01), Uchiyama et al.
patent: 4733064 (1988-03-01), Ishikawa
patent: 4792695 (1988-12-01), Blandford
patent: 4802721 (1989-02-01), Fujita
patent: 4847492 (1989-07-01), Houki
patent: 4941719 (1990-07-01), Hisada et al.
patent: 4978977 (1990-12-01), Ohmori et al.

Affiliated with

Also associated with

Rating

Optical unit for use in laser beam printer or the like does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical unit for use in laser beam printer or the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical unit for use in laser beam printer or the like will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1690584