Image forming apparatus

An image forming apparatus comprising:

• an apparatus body having an opening portion;
• an opening/closing member configured to move with respect to the apparatus body between a closed position where the opening/closing member closes the opening portion and an open position where the opening portion is opened;
• a first unit that includes a photosensitive member and is configured to be attachable to and detachable from the apparatus body via the opening portion in a state where the opening/closing member is positioned at the open position;
• a second unit configured to be attachable to and detachable from the apparatus body via the opening portion in a state where the opening/closing member is positioned at the open position;
• an exposure unit provided in the apparatus body and configured to irradiate the photosensitive member with a laser beam to expose the photosensitive member;
• a shutter member provided in the apparatus body and configured to move to a blocking position where the shutter member blocks an optical path of the laser beam from the exposure unit toward the photosensitive member and a non-blocking position where the shutter member does not block the optical path;
• and
• an interlocking mechanism provided in the apparatus body and configured to operate in an interlocking manner with the first unit, the second unit, and the opening/closing member,
• wherein the interlocking mechanism is configured to position the shutter member at the non-blocking position in a state where the first unit and the second unit are attached to the apparatus body and the opening/closing member is positioned at the closed position, and
• wherein the shutter member is configured to be positioned at the blocking position in each of a case where the first unit is not attached to the apparatus body, a case where the second unit is not attached to the apparatus body, and a case where the opening/closing member is positioned at the open position.