Patent Number: 6,169,566

Title: Non-impact printer

Abstract: A non-impact printer include a print head with a plurality of print elements such as light emitting diodes (LEDs). A driver drives the plurality of LEDs in accordance with logical states of corresponding bits of print data. A non-volatile memory stores energy specifying data. The energy specifying data describes an amount of drive energy that should be supplied to each of the plurality of print elements when each of the plurality of LEDs are driven during the printing. A random number generator generates random numbers. An adder adds the random numbers to the values of the energy specifying data to produce the energy specifying data that fluctuates within a predetermined range. Each of the plurality of LEDs is supplied with an amount of drive energy to in accordance with the fluctuating energy specifying data, thereby rendering the variations in print density of an entire image not detectable.

Inventors: Katakura; Shinichi (Tokyo, JP)

Assignee: Oki Data Corporation

International Classification: B41J 2/45 (20060101); G06K 15/12 (20060101); B41J 002/47 (); B41J 002/45 (); B41J 002/435 ()

Expiration Date: 01/02/2018