Thermal head, method for manufacturing the same, and method for adjusting dot aspect ratio of thermal head
First Claim
1. A thermal head comprising a resistance layer having a plurality of heating element portions which generate heat by energization, an insulating barrier layer which is disposed covering individually the plurality of heating element portions and which determines a two-dimensional size of each heating element portion, and electrode layers electrically connected to two end portions of each of the plural heating element portions, in a length direction of the resistance, the thermal head further comprising a heat transfer layer provided on at least the insulating barrier layer to determine a two-dimensional surface exposure area of the insulating barrier layer by covering part of the insulating barrier layer and to dissipate heat generated from the plurality of heating element portions, and surface exposure regions of the insulating barrier layer are specified as effective heating regions of the plurality of heating element portions by the heat transfer layer.
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Accused Products
Abstract
In a thermal head provided with a resistance layer having a plurality of heating element portions which generate heat by energization, an insulating barrier layer which determines the two-dimensional size of each heating element portion by covering each heating element portion, and electrode layers electrically connected to two end portions of each of the plural heating element portions, in the length direction of the resistance, a heat transfer layer is disposed on at least the insulating barrier layer to determine the two-dimensional surface exposure area of the insulating barrier layer by covering part of the insulating barrier layer and to dissipate the heat generated from the plural heating element portions, and surface exposure regions of the insulating barrier layer are specified as effective heating regions of the plural heating element portions by adjusting the two-dimensional size of the heat transfer layer.
70 Citations
9 Claims
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1. A thermal head comprising a resistance layer having a plurality of heating element portions which generate heat by energization, an insulating barrier layer which is disposed covering individually the plurality of heating element portions and which determines a two-dimensional size of each heating element portion, and electrode layers electrically connected to two end portions of each of the plural heating element portions, in a length direction of the resistance,
the thermal head further comprising a heat transfer layer provided on at least the insulating barrier layer to determine a two-dimensional surface exposure area of the insulating barrier layer by covering part of the insulating barrier layer and to dissipate heat generated from the plurality of heating element portions, and surface exposure regions of the insulating barrier layer are specified as effective heating regions of the plurality of heating element portions by the heat transfer layer.
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8. A method for manufacturing a thermal head comprising a plurality of heating element portions which generate heat by energization and electrode layers electrically connected to two end portions of each of the plural heating element portions, in a length direction of the resistance, the method comprising the steps of:
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forming an insulating barrier layer to determine a two-dimensional size of each heating element portion by covering the surfaces of the plural heating element portions and, thereafter, forming a heat transfer layer on at least the insulating barrier layer to determine a surface exposure area of the insulating barrier layer by covering part of the insulating barrier layer and to dissipate heat generated from the plural heating element portions; and
specifying surface exposure regions of the insulating barrier layer as effective heating regions of the plural heating element portions by the heat transfer layer.
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9. A method for adjusting a dot aspect ratio of a thermal head comprising a plurality of heating element portions which generate heat by energization, electrode layers electrically connected to two end portions of each of the plural heating element portions, in a length direction of resistance, an insulating barrier layer to determine the two-dimensional sizes of the heating element portions by covering the surfaces of the plural heating element portions, and a heat transfer layer which is formed covering part of the insulating barrier layer and dissipates the heat generated from the plurality of heating element portions, and
an aspect ratio of an effective heating region of each heating element portion by changing the two-dimensional size of the heat transfer layer.
Specification