Recently, a large portion of product development is focused on environment protection. Especially, the reduction of carbon dioxide is targeted to prevent global warming. For the thermal printhead, the way to address this is to improve the heat efficiency in order to realize reduced energy consumption. Our newly developed printhead achieves significant improvement in heat efficiency. Two approaches are taken during this development; (1) control the heat flow in the heater, so that heat can be concentrated at the heater and (2) increasing glaze thickness in order to utilize heat accumulation more efficiently. Previously, to make better heat response with high speed printing, utilization of thinner glaze was adopted to prevent an “Obiki” phenomenon which is ‘trailing print’ on the media. However, this thinner glaze dissipates the heat quickly and as such can result in lower heat efficiency. This paper will describe how to use the heat accumulation by thicker glaze without significant print quality degradation by Obiki. In this way high heat efficiency is achieved.