Abstract: A hybrid capacitor is provided which, while improving utilization ratio of the negative electrode active substance, achieves a low DC internal resistance. This hybrid capacitor is provided with a positive electrode having a layer of a positive electrode active substance having double-layer capacitance, and a negative electrode which has a negative electrode active substance layer that can occlude and release lithium ions and that is formed from metal compound particles having a three-dimensional network structure. The 100% discharge capacity of the metal compound particles having the three-dimensional network structure is 1.25-5.0 times the 100% discharge capacity of the positive electrode active substance.

Abstract: An engagement part fitted in an outer package of an ink cartridge is provided with: a fit-in rib which is provided at a circumferential edge on a rear side and which serves as a guide upon engagement with an opening of the outer package; an engagement rib provided upright at the circumferential edge of the engagement hole in the same direction as a direction of the fit-in rib; and a bonding region for bonding a communication tag that performs near field radio communication with a printer. A tag-removing hole which is formed in the bonding region and which is to be removed from a bonding surface side of the communication tag with a bar-like member inserted is formed in a formation region as the bonding region located in a first quadrant and a fourth quadrant in an orthogonal coordinate system.

Abstract: A hybrid capacitor is provided which, while improving utilization ratio of the negative electrode active substance, achieves a low DC internal resistance. This hybrid capacitor is provided with a positive electrode having a layer of a positive electrode active substance having double-layer capacitance, and a negative electrode which has a negative electrode active substance layer that can occlude and release lithium ions and that is formed from metal compound particles having a three-dimensional network structure. The 100% discharge capacity of the metal compound particles having the three-dimensional network structure is 1.25-5.0 times the 100% discharge capacity of the positive electrode active substance.

Abstract: An engagement part fitted in an outer package of an ink cartridge is provided with: a fit-in rib which is provided at a circumferential edge on a rear side and which serves as a guide upon engagement with an opening of the outer package; an engagement rib provided upright at the circumferential edge of the engagement hole in the same direction as a direction of the fit-in rib; and a bonding region for bonding a communication tag that performs near field radio communication with a printer. A tag-removing hole which is formed in the bonding region and which is to be removed from a bonding surface side of the communication tag with a bar-like member inserted is formed in a formation region as the bonding region located in a first quadrant and a fourth quadrant in an orthogonal coordinate system.

Abstract: An oil-based inkjet ink includes at least a pigment, a dispersant and an organic solvent, wherein a calcium content in the ink is 8 ppm or less, and a magnesium content in the ink is 3 ppm or less.