Cartridge

A cartridge for use in measuring a component to be measured contained in a fluid, the cartridge comprising a recessed well formed for storing the fluid,

• wherein the well comprises:
• a lower barrel portion including a lower peripheral wall surrounding a lower space having a closed bottom that is closed by a bottom face, a volume of the lower barrel portion corresponding to a required amount of the fluid for measurement to be injected into the well;
• an upper barrel portion that is formed above the lower barrel portion, the upper barrel portion including an upper peripheral wall surrounding an upper space having an opening on a top end for supplying a sample to the well;
• and
• a step portion formed between the lower barrel portion and the upper barrel portion, the step portion continuously connecting an inner wall surface of the lower peripheral wall and an inner wall surface of the upper peripheral wall, wherein at least a surface of the step portion has a color or roughness that is different from a color or roughness of the lower peripheral wall and the upper peripheral wall, the step including a floor portion with a planar portion, which extends radially from the inner wall surface of the lower peripheral wall and has a predetermined width, and a rising wall portion with a rising wall surface that connects an outer perimeter of the planar portion and a bottom end of the inner wall surface of the upper peripheral wall, wherein an inclination angle formed at the bottom end of the upper space by the inner wall surface of the upper peripheral wall and a plumb line perpendicular to the bottom face is greater than an inclination angle formed at the bottom end of the upper space by the rising wall surface of the step and the plumb line, and wherein the rising wall surface is colored or roughened to be non-transparent to visible light.

A cartridge for use in measuring a component to be measured contained in a fluid, the cartridge comprising a recessed well formed for storing the fluid,

• wherein the well comprises:
• a lower barrel portion including a lower peripheral wall surrounding a lower space having a closed bottom that is closed by a bottom face, a volume of the lower barrel portion corresponding to a required amount of the fluid for measurement to be injected into the well;
• an upper barrel portion that is formed above the lower barrel portion, the upper barrel portion including an upper peripheral wall surrounding an upper space having an opening on a top end for supplying a sample to the well, the upper space having a cross-sectional area that decreases towards the closed bottom in the lower space, the upper peripheral wall has a first side and a second side that is disposed opposite from the first side;
• and
• a step portion formed between the lower barrel portion and the upper barrel portion, the step portion continuously connecting an inner wall surface of the lower peripheral wall and an inner wall surface of the upper peripheral wall, wherein the step portion includes a rising wall portion with a rising wall surface that adjoins a bottom end of the inner wall surface of the upper peripheral wall, and wherein the rising wall surface is colored or roughened to be non-transparent to visible light, and
• wherein the opening at the top end of the upper peripheral wall is eccentric with respect to the bottom face of the lower barrel portion, and an inclination of the inner wall surface of the upper peripheral wall on the first side is different from an inclination of the inner wall surface of the upper peripheral wall on the second side.