Variable pel density print head for electrophotographic printers

Details Variable pel density print head for electrophotographic printers Variable pel density print head for electrophotographic printers

1990-03-12

1991-03-26

Arnold, Bruce Y.

350286, G02B 1700, G02B 504

Patent

active

050023756

ABSTRACT:
In a laser printer, light beams need to be focused onto a printing surface to form points where print indicia are to effect a print image. In a printer where it is desirable to have variable pitch print characters, a new method has been employed to create variable print character pitches. Multiple non-parallel points of light are emitted through a collimating lens onto a wedge shaped optical component which directs the multiple beams of light into parallel alignment. The optical wedge has one planar surface perpendicular to at least one light beam emitted through the collimating lens. This light beam is normal to the perpendicular planar surface and passes through the wedge without being deflected. The optical wedge also has one or more planar surfaces that direct the other light beams into parallel alignment with the undeflected light beam. By moving the optical wedge away from the collimating lens the pitch (distance) between the light beams is increased and conversely, by moving the optical wedge towards the collimating lens the pitch decreases.

REFERENCES:
patent: 4892371 (1990-01-01), Yamada et al.

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