JPS61244566A - Thermal head - Google Patents

Abstract

PURPOSE:To enhance thermal efficiency of a thermal head, by a construction wherein wiring layers are provided in the form of alternate wiring, and heating resistor layers are provided independently at each gap between opposed ones of the wiring layers. CONSTITUTION:The wiring layers 2 are provided on an insulating substrate in the form of alternate wiring, and the heating resistor layers 1 are provided independently for each dot. The wiring layers 2 are provided by a photo-resist treating method in such a pattern that the tips of comb teeth are opposed from both sides. The opposed tips of the wiring layers 2 overlap with each other alternately in the opposing direction, and are provided in the form of alternate wiring so that gaps with a predetermined size are provided in the direction orthogonal to the opposing direction. The tips of the wiring layers 2 are provided to be smaller in width at the overlapping parts. The heating resistor layers 1 are provided independently at each to1 the gaps provided in the lateral direction at the tips of the wiring layers 2, and both end parts in the lateral direction are connected to the tip side parts of the layers 2 by riding on and making contact with the latter.

Description

DETAILED DESCRIPTION OF THE INVENTION (a+ Technical Field) This invention relates to a thermal head in which a thick film or thin film heating resistor array is formed on an insulating substrate.

The fbl prior art thermal head is basically constructed by connecting wiring layers 2 to both ends of each heating resistor layer 1 formed for each recording dot on an insulating substrate, as shown in FIG. By passing a current through the wiring layers 2 at both ends, each heat generating resistor layer 1 generates heat appropriately and records the heat on the thermal paper. However, since there is a limit to the precision of pattern formation for the heating resistor layer 1 and the wiring layer 2, conventionally, as shown in FIG.
The width of the comb-toothed tips of the combs is narrowed, and the tips are alternately overlapped in the opposite direction (vertical direction on the drawing) and horizontally (horizontal direction on the drawing) with respect to the opposing direction (vertical direction on the drawing). The invention of a thermal head in which the wiring is formed in an alternating manner with gaps at predetermined intervals, and the heating resistor layer 1 is continuously formed in a band shape in the lateral direction on the overlapped portion of the leading ends of the wiring layer 2. It had been done. According to this conventional thermal head, each part of the heating resistor layer 1 located in the gap between the wiring layers 2 can be made to generate heat independently by energizing the wiring layers 2 on both sides in appropriate combinations. It is responsible for the illumination of each part of the heating resistor layer 1 located on both sides of the wiring layer 2 or its tip, and has the same pattern formation density as the basic structure of the thermal head shown in FIG. It is possible to form a heat-generating portion in the number of dots, and high-quality recording can be performed.

However, in such a conventional thermal head, since the heating resistor layer 1 is connected in a continuous band shape, the heat generated in each part is easily transmitted to the non-heating parts of the heating resistor layer 1 and released. Become.

In addition, since the contact area between the heating resistor layer 1 and the wiring layer 2 is wide, heat is easily transmitted to the wiring layer 2 via this contact area and is easily released. This has the drawback that the amount of heat dissipated through other parts of the body layer 1 and the wiring layer 2 increases, resulting in poor thermal efficiency.

(C1 Purpose of the Invention This invention was made in view of the above circumstances, and it is an object of the present invention to form wiring layers in an alternate wiring format and to form heating resistor layers independently between each wiring layer. The purpose is to provide a thermal head with high thermal efficiency.

Structure and effect of the fd+ invention The thermal head of this invention is outstanding! The comb-like tips of the wiring layer are placed facing each other from both sides on the board.
The tips of the wiring layers on both sides are alternately overlapped in the opposite direction, and a gap of a predetermined interval is left in the lateral direction with respect to the opposite direction, forming an alternate wiring format. When the thermal head of the present invention, which is characterized in that the body layer is formed independently for each lateral gap at the tip of the wiring layer, is configured as described in ``2'', the heating resistor layer is formed separately for each door. Since each heat generating resistor layer is formed independently, heat is not directly transmitted to other parts of the heat generating resistor layer that do not generate heat. Further, since there is no need to make the contact area between each heating resistor layer and the wiring layer larger than necessary, there is no need for a large amount of heat to be released through the wiring layer. Therefore, in the thermal head of the present invention, the amount of heat radiated from the heat generating portion of the heat generating resistor layer is reduced.
Thermal efficiency is improved, yet the advantages of high density formation of recording dots in an alternating wiring format are retained.

(Embodiment 81 FIG. 1 is a partial plan view of an insulating substrate of a thermal head according to an embodiment of the present invention.

The thermal head of this embodiment is constructed by forming wiring layers 2 on an insulating substrate in an alternate wiring format, and forming heating resistor layers 1 independently for each dot. The insulating substrate is an insulating substrate made of an alumina substrate or the like. The wiring layer 2 is formed by photoresist processing method.
It is formed in a pattern in which the tooth-like tips of the comb face each other from both sides. The opposing ends of the wiring layer 2 overlap in an alternating manner in the opposing direction (vertical direction in the drawing), and leave a gap of a predetermined distance in the lateral direction (horizontal direction in the drawing) with respect to the opposing direction. They are formed in an alternate wiring format. Further, each tip of the wiring layer 2 is formed so that the width becomes narrower at the overlapping portion. The heating resistor layer 1 is formed independently in each lateral gap at the tip of the wiring layer 2, and both lateral ends ride on and contact the side of the tip of the wiring layer 2. connected by.

The pattern of this wiring layer 2 is printed by a cut-out screen called a mesotype screen or a metal screen. Note that during this printing, care should be taken to prevent printing blur from occurring.

In the thermal head of this embodiment configured as described above, the heating resistor layer 1 is formed independently for each dot, so that heat is directly transmitted to other parts of the heating resistor layer 1 that do not generate heat. This will no longer be the case. Further, since the contact area between each heating resistor layer 1 and the wiring layer 2 does not need to be made larger than necessary, a large amount of heat is not released through the wiring layer 2. Therefore, the amount of heat radiated from the heat generating resistor layer 1 is reduced, so that the thermal efficiency of the thermal head is improved.

[Brief explanation of drawings]

FIG. 1 is a partial plan view of an insulating substrate of a thermal head F according to an embodiment of the present invention, FIG. 2 is a partial plan view of an insulating substrate showing the basic structure of a thermal head, and FIG.
The figure is a partial plan view of the insulating substrate of a conventional Sumaruhesoto. 1-heating resistor layer, 2-wiring layer.

Claims (1)

[Claims] (1) The comb-like tips of the wiring layers are placed facing each other on both sides on the insulating substrate, and the tips of the wiring layers on both sides are
The heating resistor layers are formed in such a way that they are alternately overlapped in opposing directions and have gaps at a predetermined interval in the lateral direction with respect to the opposing directions. A thermal head characterized by being formed independently for each gap.