Thermally conductive sheet and method of manufacturing the same
A thermally conductive sheet comprises a thermally conductive polymer layer, an adhesive layer provided on an outer surface of the thermally conductive polymer layer, and a thermal diffusion layer, which is a functional layer provided on the adhesive layer. The thermally conductive polymer layer is formed of a thermally conductive polymer composition containing a polymer matrix and a thermally conductive filler. The coefficient of static friction of the thermally conductive polymer layer is 1.0 or lower. The adhesive layer has an outer shape smaller than that of the thermally conductive polymer layer.
1. A thermally and electrically conductive sheet configured to discharge heat from a heat discharging body, the heat being generated from a heat emitting body, and to prevent electrostatic discharge due to charging of the heat emitting body, the thermally and electrically conductive sheet comprising:
an electrically conductive layer located on the heat emitting body, the electrically conductive layer having a central portion that contacts the heat emitting body and a peripheral portion that contacts the heat discharging body; and
a thermally conductive polymer layer located between the central portion of the electrically conductive layer and the heat discharging body and comprising a polymer matrix and a filler in fiber form;
wherein the filler is oriented in a direction of a thickness of the thermally conductive polymer layer, wherein the polymer matrix and the filler contact the electrically conductive layer and the heat discharging body to transfer the heat from the heat emitting body to the heat discharging body, and wherein the electrically conductive layer allows a current to flow from the heat emitting body to the heat discharging body due to the contact of the peripheral portion of the electrically conductive layer with the heat discharging body.
2. The thermally and electrically conductive sheet according to claim 1 , wherein a coefficient of static friction of the thermally conductive polymer layer is 1.0 or lower.
3. The thermally and electrically conductive sheet according to claim 1 , wherein a coefficient of static friction of the thermally conductive polymer layer is 0.3 or lower.
4. The thermally and electrically conductive sheet according to claim 1 , wherein the thickness of the thermally conductive polymer layer is 0.03 mm to 0.5 mm.
5. The thermally and electrically conductive sheet according to claim 1 , wherein an adhesive layer is provided on an outer surface of the thermally conductive polymer layer to be located between the conductive layer and the thermally conductive polymer layer.
6. The thermally and electrically conductive sheet according to claim 5 , wherein a thickness of the adhesive layer is 50 μm or less.
7. The thermally and electrically conductive sheet according to claim 5 , wherein a ratio of area occupied by the adhesive layer to area of the entirety of the surface of the thermally conductive polymer layer on which the adhesive layer is provided is 30% or less.
8. The thermally and electrically conductive sheet according to claim 7 , wherein the adhesive layer is provided as a number of pieces in multi-dot form over the entirety of the surface of the thermally conductive polymer layer.
9. The thermally and electrically conductive sheet according to claim 7 , wherein the adhesive layer is provided throughout the entirety of the peripheral portion of the thermally conductive polymer layer.
10. The thermally and electrically conductive sheet according to claim 1 , wherein the thickness of the electrically conductive layer is 20 μm or less.
11. The thermally and electrically conductive sheet according to claim 10 , wherein the thickness of the electrically conductive layer is 2 μm to 14 μm.
12. A thermally and electrically conductive sheet configured to discharge heat from a heat discharging body, the heat being generated from a heat emitting body, and to prevent electrostatic discharge due to charging of the heat emitting body, the thermally and electrically conductive sheet comprising:
a thermally conductive polymer layer including a polymer matrix and a filler in fiber form contained in the polymer matrix, wherein the filler is oriented in a direction of a thickness of the thermally conductive polymer layer and exposed from a surface of the polymer matrix; and
an electrically conductive layer having a central portion and a peripheral portion, wherein the central portion has a first surface that contacts the thermally conductive polymer layer and a second surface that is configured to contact the heat emitting body, and wherein the peripheral portion of the electrically conductive layer contacts the heat discharging body.