Patent attributes
A honeycomb filter including a honeycomb fired body including porous cell partition walls, exhaust gas introduction cells, exhaust gas emission cells, and an outer wall on the periphery thereof. Provided that the hydraulic diameter is given by the following equation (1) and the area based on the given hydraulic diameter is given by the following equation (2), the ratio of the area based on the hydraulic diameter of an exhaust gas introduction cell to the cross-sectional area of the exhaust gas introduction cell is 0.95 to 0.98, and the ratio of the area based on the hydraulic diameter of an exhaust gas emission cell to the cross-sectional area of the exhaust gas emission cell is 0.7 to 0.9: Hydraulic diameter=(4×cross-sectional area of cell)/Cross-sectional peripheral length of cell (1), Area based on the hydraulic diameter=π×(Hydraulic diameter/2)2(2).
