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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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