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:
Nov. 08, 1994
Filed:
May. 13, 1992
Fuyuki Inui, Tokyo, JP;
Hitoshi Saito, Tokyo, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A thermal recording method and device for recording a half-tone image on a recording sheet, wherein each pixel includes a plurality of sub-lines, and a half-tone is produced by changing the number of the sub-lines where ink is recorded. According to a desirable tonal step, a number of drive pulses are applied to a thermal element for each pixel while the thermal element moves in a sub scan direction relative to the recording sheet, with one drive pulse corresponding to one sub-line. The width of the drive pulse corresponding to the first sub-line of each pixel is set longer than the other drive pulses for the following sub-lines, and is changed according to the pixel position in the sub scan direction. The width of the drive pulse for the first sub-line is the longest at the beginning of recording, and becomes shorter as the recording proceeds. The widths of the other drive pulses may be changed according to the sub-line position within each pixel.