Abstract: A liquid discharge apparatus including a head configured to discharge a liquid, a chamber configured to contain the head, a circulation system configured to circulate a gas inside the chamber, an exhaust system configured to operate to exhaust the gas to an outside of the chamber, a filter provided in the circulation system and configured to remove a removal target contained in the gas, a detection unit configured to indirectly detect the removal target by detecting a detection target that is contained in the gas and different from the removal target, and a controller configured to operate the exhaust system when a concentration of the detection target detected by the detection unit is not lower than a threshold.

Abstract: A component carrying tray includes a bottom plate on which a component is stacked, and a projection. The projection has a main body and a regulator. The main body is hollow and has a tapering shape. The regulator is formed in the main body and extends in a direction perpendicular to the carrying surface and contacts a side surface of the component to regulate the component carried on the carrying surface. The bottom plate has a through hole so that when the component carrying tray is stacked on an additional component carrying tray, a projection of the additional component carrying tray comes into the hollow part of the main body. An opening is formed in the projection and configured to avoid, when the component carrying tray is stacked on an additional component carrying tray, interference between the projection and a regulator of the additional component carrying tray.

Abstract: A component carrying tray includes a bottom plate on which a component is stacked, and a projection. The projection has a main body and a regulator. The main body is hollow and has a tapering shape. The regulator is formed in the main body and extends in a direction perpendicular to the carrying surface and contacts a side surface of the component to regulate the component carried on the carrying surface. The bottom plate has a through hole so that when the component carrying tray is stacked on an additional component carrying tray, a projection of the additional component carrying tray comes into the hollow part of the main body. An opening is formed in the projection and configured to avoid, when the component carrying tray is stacked on an additional component carrying tray, interference between the projection and a regulator of the additional component carrying tray.