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HighResolutionLEDPrintHead-OKI
August 1998 OKI Technical Review Vol. 64
Special Issue on Printers: UDC 681.327.54’ 22-187.4 : 772.931.067 : [621.382.2 : 535.376]
High Resolution LED Print Head
Katsuya KAMIMURA*, Yoshihisa AIKO*
Abstract
A 1200 dpi LED print head requires high precision light quantity compensation technology to adjust the dispersion of light
quantity by an LED light sources and optical system. In conventional light quantity compensation, an area has been
calculated assuming that the image formation shape of the LED is a circle. This time we developed a high precision
compensation technology for the distortion of an image by measuring the area of an ellipse using two sensors that have slits
perpendicular to each other. With this technology, we implemented a high resolution LED print head with uniform density.
1. Introduction
In a 1200 dpi LED print head, 1200 dpi LED arrays, the
light sources of the print head, have already been imple-
mented by Zn solid phase diffusion technology 1. For LED
print heads, luminous energy compensation technology
combined with the rod lens required for image formation to
control light intensity dispersion is important.
This paper first presents an overview of an LED head,
describes the factors which influence image quality, and
finally describes the light intensity compensation technol-
ogy that we developed for a 1200 dpi LED head.
2. Overview of LED head
Photo 1: 1200 dpi LED print head and LED array unit
Photo 1 shows the appearance of a 1200 dpi LED head and
LED array unit.
2.1 Optical operation Image drum
As Figure 1 shows, the LED head consi
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