Abstract: A multi-beam laser scanning unit including a plurality of laser diodes arranged in the vertical direction, and a plurality of collimating lens units having collimating lenses, which are arranged in the laser beam optical path in order to convert laser beams emitted from each of the laser diodes into linear beams. The collimating lens units are arranged in a manner such that adjacent collimating lens units are partly overlapped in the laser beam scanning direction. Each of the collimating lenses has a different focal length.

Abstract: A multi-beam laser scanning unit including a plurality of laser diodes arranged in the vertical direction, and a plurality of collimating lens units having collimating lenses, which are arranged in the laser beam optical path in order to convert laser beams emitted from each of the laser diodes into linear beams. The collimating lens units are arranged in a manner such that adjacent collimating lens units are partly overlapped in the laser beam scanning direction. Each of the collimating lenses has a different focal length.

Abstract: A laser scanning unit disclosed in the present invention is intended to form an image on a photo-sensitive drum by generating laser beams in a facsimile unit, a copying machine and a printer using laser beams. The laser scanning unit includes a collimated lens reforming the laser beams emitted from a laser diode into parallel beams, a polygon mirror scanning by deflecting the above laser beams in constant velocity, a f-theta lens for adjusting a focus on a scanning plane by polarizing the laser beams to a main scanning direction and correcting an aberration, a reflecting surface attached with a reflecting film reflecting said laser beams into a horizontal direction, an optical sensor receiving the laser beams reflected from said reflecting film and a base plate for supporting said optical sensor and reflecting surface.

Abstract: A laser scanning unit disclosed in the present invention is intended to form an image on a photo-sensitive drum by generating laser beams in a facsimile unit, a copying machine and a printer using laser beams. The laser scanning unit includes a collimated lens reforming the laser beams emitted from a laser diode into parallel beams, a polygon mirror scanning by deflecting the above laser beams in constant velocity, a f-theta lens for adjusting a focus on a scanning plane by polarizing the laser beams to a main scanning direction and correcting an aberration, a reflecting surface attached with a reflecting film reflecting said laser beams into a horizontal direction, an optical sensor receiving the laser beams reflected from said reflecting film and a base plate for supporting said optical sensor and reflecting surface.

Abstract: A laser beam isolation apparatus of a laser printer includes a blocking portion formed on the laser scanning unit to be moved between a blocking position to block a passing hole of the laser scanning unit and an open position to open the passing hole, a guide portion mounted in the laser scanning unit relative to the blocking portion, guiding the blocking portion to move between the blocking position and the open position, and an operating portion formed on the developer unit. The operating portion is operated to move the blocking portion along the guide portion. During a removal of the developer unit, the blocking portion that blocks a laser beam of a laser diode from being emitted out of the laser scanning unit is moved to the blocking position by its own weight.

Abstract: A laser scanning apparatus comprises a light source, a deflecting unit, a rotating guide, a drive motor and an image forming lens. The light source emits laser beams. The deflecting unit deflects the laser beams emitted by the light source into a scanning direction. The rotating guide has a plurality of guide holes for scanning the laser beams at a constant velocity, the rotating guide accommodating the deflecting unit and being positioned so that the light source lies on central axis of the rotating guide. The drive motor rotates the rotating guide while engaged with it, and the image forming lens focuses the laser beams passing through the guide holes of the rotating guide onto a surface.

Abstract: A laser scanning unit disclosed in the present invention is intended to form an image on a photo-sensitive drum by generating laser beams in a facsimile unit, a copying machine and a printer using laser beams. The laser scanning unit includes a collimated lens reforming the laser beams emitted from a laser diode into parallel beams, a polygon mirror scanning by deflecting the above laser beams in constant velocity, a f-theta lens for adjusting a focus on a scanning plane by polarizing the laser beams to a main scanning direction and correcting an aberration, a reflecting surface attached with a reflecting film reflecting said laser beams into a horizontal direction, an optical sensor receiving the laser beams reflected from said reflecting film and a base plate for supporting said optical sensor and reflecting surface.

Abstract: A laser scanning unit disclosed in the present invention is intended to form an image on a photo-sensitive drum by generating laser beams in a facsimile unit, a copying machine and a printer using laser beams. The laser scanning unit includes a collimated lens reforming the laser beams emitted from a laser diode into parallel beams, a polygon mirror scanning by deflecting the above laser beams in constant velocity, a f-theta lens for adjusting a focus on a scanning plane by polarizing the laser beams to a main scanning direction and correcting an aberration, a reflecting surface attached with a reflecting film reflecting said laser beams into a horizontal direction, an optical sensor receiving the laser beams reflected from said reflecting film and a base plate for supporting said optical sensor and reflecting surface.

Abstract: An expandable cassette for use with device to support a sheet that is fed into from a communication machinery. The expandable tray may include a first tray and a second tray mounted on the first sheet support so that the second tray can be rotated around a shaft that is attached to tray in the direction that paper is discharged from the image forming device. A third tray may be slidably mounted on the second tray in such a manner that the third tray is moveable back and forth along direction that paper is discharged from the image forming apparatus.