Abstract: A honeycomb filter comprises a columnar body including inlet-side flow passages (first flow passages) and outlet-side flow passages (second flow passages) extending in an axial direction and including partition walls W separating the adjacent flow passages. A cross-section area of each inlet-side flow passage on one end face of the columnar body is larger than a cross-section area of each inlet-side flow passage in a central part in the axial direction, and a cross-section area of each outlet-side flow passage is closed on the one end face. A corner part C that forms the inlet-side flow passage and is formed between an adjacent pair of partition walls W has a protrusion part (first protrusion part)—that protrudes toward an interior of the inlet-side flow passage and extends in the axial direction, in a central part of at least one of the inlet-side flow passages in the axial direction.

Abstract: This particulate filter 200 has a columnar ceramic honeycomb structure 201 including first flow channels 210 and second flow channels 220. Adjacently to each of the first flow channels 210, the second flow channel 220 and the other first flow channel 210 are arranged through a partition wall portion forming each of the first flow channels 210. A sum total of areas of the inner faces of the first flow channels 210 per apparent unit volume of the ceramic honeycomb structure 201 is 1.5 to 2.5 m2/L; a number density of a total of the first flow channels 210 and the second flow channels 220 is 150 to 350 per unit square inch in a cross section perpendicular to an axis of the ceramic honeycomb structure 201; and a hydraulic diameter of each of the first flow channels 210 is 0.5 to 1.0 mm.

Abstract: An extrusion molding device 1 comprises a first pipe 10, a screw 2B that is provided in the first pipe 10, a second pipe 50 that is connected to the outlet of the first pipe 10, a flow adjustment plate 20 that is disposed between the first pipe 10 and the second pipe 50, and a die 90 that is connected to the outlet of the second pipe 50. The second pipe 50 includes, in order from the side of the first pipe 10, a first portion 32 having a constant inner diameter, a second portion 34 having an inner diameter that decreases as the second portion 34 extends from the first portion 32, and a third portion 36 having a constant inner diameter. The second portion 34 is undetachably integrated with the first portion 32, and the third portion 36 is undetachably integrated with the second portion 34.

Abstract: This particulate filter 200 has a columnar ceramic honeycomb structure 201 including first flow channels 210 and second flow channels 220. Adjacently to each of the first flow channels 210, the second flow channel 220 and the other first flow channel 210 are arranged through a partition wall portion forming each of the first flow channels 210. A sum total of areas of the inner faces of the first flow channels 210 per apparent unit volume of the ceramic honeycomb structure 201 is 1.5 to 2.5 m2/L; a number density of a total of the first flow channels 210 and the second flow channels 220 is 150 to 350 per unit square inch in a cross section perpendicular to an axis of the ceramic honeycomb structure 201; and a hydraulic diameter of each of the first flow channels 210 is 0.5 to 1.0 mm.

Abstract: A light-emitting device includes a planar light-emitting unit having a light-emitting surface and a non-light-emitting surface, a planar solar power generator having a light-receiving surface and a non-light-receiving surface, and a rechargeable battery. The light-emitting unit and the solar power generator are arranged so that the non-light-emitting surface and the non-light-receiving surface face each other, thereby forming a light-electricity converter. The light-emitting device includes an orientation sensor configured to sense an orientation of the light-electricity converter, and a connection switch arranged between the light-emitting unit and the solar power generator. The connection switch is configured to connect the rechargeable battery: to the solar power generator when the orientation sensor detects that the light-receiving surface faces toward a first direction; and to the light-emitting unit when the orientation sensor detects that the light-emitting surface faces toward the first direction.