Patent ID: 11137712

Abstract:
An image forming apparatus including: a circuit board including a varistor, an electric part different from the varistor, and a heatsink for the electric part, the circuit board being supplied with a voltage from a commercial power source; a fan configured to cool the circuit board; and a housing configured to house the circuit board, wherein an opening is formed in the housing, wherein a cross-section shape of the heatsink is a U-shape, the varistor is positioned between a first wall portion and a second wall portion of the heatsink so that the heatsink straddles the varistor, and a position of the heatsink in a direction orthogonal to a longitudinal direction of the heatsink overlaps with a position of the opening in the direction so that an air is caused to flow between the first wall portion and the second wall portion through the opening by the fan.