The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2001
Filed:
Jun. 22, 1998
Makoto Asako, Tachikawa, JP;
Kenji Takano, Kawagoe, JP;
Kazutaka Otsuka, Hachioji, JP;
Yutaka Ichimura, Yokohama, JP;
Yukio Akita, Tokyo, JP;
Yoshiyuki Matsuoka, Tokorozawa, JP;
Kozoh Satoh, Tokorozawa, JP;
Tsutomu Kobayashi, Higashiyamato, JP;
Other;
Abstract
A printer controller,sets compensation values, representing the positional deviations of LED array chips,in a delay circuit section,via shift register,and a latch circuit,The shift register,sequentially acquires bit map data from the printer controller,and supplies the acquired bit map data to an AND gate,through the latch circuit,Upon receiving a strobe signal from the printer controller,the delay circuit section,supplies the received strobe signal to the AND gate,after a delay time corresponding to a preset compensation value has lapsed. The AND gate,generates drive signals each being the logical product of the input bit map data and the strobe signal, and supplies them to the LED array chips,through a buffer,The LED array chips,make LEDs emit light at the timings corresponding to the positional deviations so that images are formed without a positional deviation. At least one of the LED array chips is unaligned with adjacent ones of the LED array chips and preset compensation values are obtained by interpolation based on detected positional deviations of sampled ones of the LED array chips.