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Led print head and method of adjusting the focus thereof

  • US 5,808,718 A
  • Filed: 06/18/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 06/22/1995
  • Status: Expired due to Fees
First Claim
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1. An LED print head for use in an LED printer, comprising:

  • an LED circuit board on which a plurality of LED chips are mounted in line, each LED chip having a plurality of LEDs;

    a lens assembly for focusing light emitted from the plurality of LEDs at a line of points on a surface of a photosensitive drum, the drum having a diameter that varies along an axis of rotation thereof;

    wherein at least one of said LED circuit board and said lens assembly is resiliently deformable; and

    a mechanism adapted to cause said at least one of said LED circuit board and said lens assembly to deform relative to the surface of the photosensitive drum, such that each of the points on the surface of the photosensitive drum are about a same distance from said lens assembly as the respective point'"'"'s corresponding LED, whereby image formation of each of the LEDs takes place on the surface of the photosensitive drum, with the formed image being essentially the same size as the respective LED.

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