Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-05-15
1999-11-02
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
B41J 201
Patent
active
059780096
ABSTRACT:
An LED printer which forms a printed image by driving an LED head comprises a smoothing circuit in the LED head driving circuit the smoothing circuit forms interpolation lines by matching the original lines of the input data signal having a vertical resolution of 200 dpi with a given pattern and produce a print data signal of 400 dpi so as to improve the resolution of the printed image. The LED head driving circuit comprises a circuit for detecting the printing condition related to the image to be printed and producing a printing condition signal comprised of a line counter for detecting whether the line to be printed is the original line or the interpolation line, a transition counter point for counting the transition points of the input data signal between black and white dots, a dot counter for detecting the print density of the input data signal and a resolution detecting portion for detecting the resolution of the input data signal. The LED head driving circuit comprises a strobe signal generator, which previously stores therein a plurality of strobe signals related to the energizing periods of respective LED elements provided in the LED head for driving the same and selectively produces the strobe signal according to the printing condition related to the image to be printed based on the input data signal. The LED head drives each LED element based on the strobe signal to form an image.
REFERENCES:
patent: 4701806 (1987-10-01), Takashima
patent: 4996603 (1991-02-01), Kanemitsu et al.
patent: 5140413 (1992-08-01), Suzuki et al.
patent: 5337075 (1994-08-01), Takahashi et al.
patent: 5384591 (1995-01-01), Tsuda
Le N.
Nghiem Michael
OKI Electric Industry Co., Ltd.
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