Thermal head and thermal head unit
First Claim
Patent Images
1. A thermal head comprising:
- a substrate;
a plurality of heat generating elements formed on the substrate and arranged in an array along a row;
a segment electrode formed on the substrate for each of the heat generating elements;
an individual common electrode formed on the substrate for each of the heat generating elements;
one or more semiconductor integrated circuits connected to a plurality of the segment electrodes, each integrated circuit for driving plural heat generating elements;
an elongated common electrode extending in the direction of the array of heat generating elements and being connected to each of the individual common electrodes; and
a plurality of common electrode wiring patterns for connecting the elongated common electrode to an external connection terminal, the common electrode wiring patterns being disposed at plural locations in the direction of the array of heat generating elements;
further comprising a circuit board on which the integrated circuits are provided; and
wherein a plurality of the common electrode wiring patterns are provided on the circuit board in the direction of the array for connecting the elongated common electrode to the external connection terminal.
1 Assignment
0 Petitions
Accused Products
Abstract
A thermal head and a thermal head unit are provided, which can prevent density variation while suppressing the size of the thermal head to be small. In a thermal head (10) having a head chip (20) having one surface on which heat generating elements and segment and common electrodes connected to the heat generating elements are provided, and an IC chip (32) connected to the segment electrodes, the common electrode (27) provided to the head chip (20) is elongated in an array direction of the heat generating elements, and connections between the common electrode (27) and common electrode wirings (41) are provided at plural locations along the array direction.
7 Citations
18 Claims
-
1. A thermal head comprising:
- a substrate;
a plurality of heat generating elements formed on the substrate and arranged in an array along a row;
a segment electrode formed on the substrate for each of the heat generating elements;
an individual common electrode formed on the substrate for each of the heat generating elements;
one or more semiconductor integrated circuits connected to a plurality of the segment electrodes, each integrated circuit for driving plural heat generating elements;
an elongated common electrode extending in the direction of the array of heat generating elements and being connected to each of the individual common electrodes; and
a plurality of common electrode wiring patterns for connecting the elongated common electrode to an external connection terminal, the common electrode wiring patterns being disposed at plural locations in the direction of the array of heat generating elements;
further comprising a circuit board on which the integrated circuits are provided; and
wherein a plurality of the common electrode wiring patterns are provided on the circuit board in the direction of the array for connecting the elongated common electrode to the external connection terminal. - View Dependent Claims (2)
- a substrate;
-
3. In a thermal head having a head chip on which are disposed a plurality of heat generating elements, a plurality of segment electrodes and a plurality of common electrodes connected to the heat generating elements, and a circuit board on which a plurality of semiconductor integrated circuits are provided each for driving plural heat generating elements, the improvement comprising:
- the circuit board on which the semiconductor integrated circuits are mounted is joined to the head chip;
an elongated common electrode connected to each of the respective common electrodes is provided on the head chip, and common electrode wiring patterns are provided on the circuit board at plural locations along a direction of the elongated common electrode for connecting the elongated common electrode to an external connection terminal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- the circuit board on which the semiconductor integrated circuits are mounted is joined to the head chip;
-
15. A thermal head comprising:
- a head chip having a ceramic substrate, a plurality of heat generating elements formed on the ceramic substrate and arranged in a row, and individual electrodes formed on the ceramic substrate and connected to the heat generating elements;
a circuit board having an external connection terminal, and a plurality of IC chips each for driving a plurality of the heat generating elements by outputting print signals to selectively generate heat from selected heat generating elements at desired timings;
an elongated common electrode provided on the head chip extending in the direction of the row and being connected to individual electrodes of each of the heat generating elements; and
common electrode wiring patterns connected at first ends to an external connection terminal and at second ends to the elongated common electrode. - View Dependent Claims (16, 17, 18)
- a head chip having a ceramic substrate, a plurality of heat generating elements formed on the ceramic substrate and arranged in a row, and individual electrodes formed on the ceramic substrate and connected to the heat generating elements;
Specification