OKI Digital Imaging - Head Structure


LED printheads use an array containing multiple LEDs and the LEDs individually turn on and off according to print signals. OKI Digital Imaging a device (epitaxial thin film LED array), which unites the LED and LED driver IC using the epitaxial thin film bonding technology, and adopted it in LED printheads. Our LED printhead is made of a COB (Chip on board) that has multiple epitaxial thin film LED arrays lined up on a PCB in a print width such as A4 and A3 and a rod lens array through which light from the LED strikes the image drum and exposes it to form an image on the drum. For example, a 600 dpi (dots per inch), A4-size head has 4,992-dot LEDs lined up in an array and individual LEDs emit/shut light correspondingly to print data and write a latent image on the image drum.