Thermal printhead
OwnerMasatoshi Nakanishi, Shinobu Obatainventors
Life of this patent
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Abstract
In a thermal printhead (A), a common wiring portion (4) is divided into a plurality of blocks (BL) arranged side by side in a primary scanning direction, and voltage is applied to opposite ends of each of the blocks (BL) in the primary scanning direction. A plurality of heating resistance sections (3) are divided into a plurality of blocks (BL′) corresponding to the blocks (BL) of the common wiring portion (4), and in each of the blocks (BL′), the resistance reduces as proceeding from opposite ends toward the center in the primary scanning direction. Therefore, the adjustment of the resistances of the plurality of heating resistance sections is easy, and the non-uniformity in darkness of print dots is reduced, so that high-quality image printing is possible.
Claims5
A thermal printhead comprising:
- a plurality of heating resistance sections arranged on a substrate side by side in a primary scanning direction;
- a common wiring portion at least part of which extends in the primary scanning direction while being spaced from the heating-resistance sections in a secondary scanning direction;
- and
- a plurality of first lead wiring portions and a plurality of second lead wiring portions for connecting the heating resistance sections to the common wiring portion and to a drive IC for controlling energization;
- wherein the common wiring portion is segmented into a plurality of blocks arranged side by side in the primary scanning direction, and voltage is applied to opposite ends of each of the blocks in the primary scanning direction;
- and
- wherein the plurality of heating resistance sections are segmented into a plurality of other blocks corresponding to the blocks of the common wiring portion, and, in each of said other blocks, resistance of the heating resistance sections reduces as proceeding from opposite ends toward center of the block in the primary scanning direction.
Dependencies are inferred from the claim text.