Abstract: The air purifier is provided with a housing having an air intake port and an exhaust port, a filter unit including a photocatalytic filter and housed in a unit housing section within the housing, a light source that irradiates the photocatalytic filter with light, an air blowing fan that generates an air flow passing through the unit housing section, and a contamination sensor provided between the photocatalytic filter and the air blowing fan. In a case where a controller determines that organic substances excessively adheres to the photocatalytic filter on the basis of detection values of the contamination sensor, it drives the light source at the maximum light quantity and drives the air blowing fan at the minimum air speed to refresh the photocatalytic filter.

Abstract: An air purifier includes a housing that includes an intake port and an exhaust port, a filter unit that includes a photocatalytic filter and is housed in a unit housing within the housing, a light source that exposes the photocatalytic filter to light, and a blast fan that generates a flow of air passing through the unit housing. The photocatalytic filter is formed in a wavy shape in which ridge portions and trough portions extending in a first direction are alternately arranged in a second direction orthogonal to the first direction, and the photocatalytic filter is housed in the unit housing such that the flow of air flows along the first direction.

Abstract: A sheet pressing mechanism includes a pressing member configured to press a sheet that has been deformed to corrugate in a width direction that is orthogonal to a sheet discharging direction when the sheet is discharged toward a discharge tray. The pressing member has a first pressing area for pressing portions other than a top portion of a crest of the sheet when the discharged sheet comes into contact with the pressing member.