Image forming apparatus

An image forming apparatus comprising:

• a first photosensitive member configured to be formed a toner image on a surface thereof;
• a first exposure device configured to from an electrostatic image which becomes the toner image by being developed on the first photosensitive member and to form a first electrostatic image index formed by a linear electrostatic image that is inclined by a first angle in a main scanning direction orthogonal to a sub scanning direction, which corresponds to the direction of rotation of the first photosensitive member, on the first photosensitive member;
• a conveying member;
• a first transfer portion configured to transfer the first electrostatic image index formed on the first photosensitive member to the conveying member together with the toner image;
• a second photosensitive member disposed on a downstream of the first photosensitive member in the direction of movement of the conveying member;
• a second exposure device configured to form a linear second electrostatic image index that is inclined by a second angle different from the first angle in the main scanning direction of the second photosensitive member on the second photosensitive member;
• a second transfer portion configured to transfer the second electrostatic image index formed on the second photosensitive member so as to overlap with the first electrostatic image index that is transferred to the conveying member;
• a first detecting portion having a linear conductive member inclined by the first angle in the main scanning direction with respect to the conveying member and configured to detect an induced current generated in the linear conductive member inclined by the first angle by passage of the first electrostatic image index transferred to the conveying member;
• and
• a second detecting portion having a linear conductive member inclined by the second angle in the main scanning direction with respect to the conveying member and configured to detect an induced current generated in the linear conductive member inclined by the second angle by passage of the second electrostatic image index transferred to the conveying member.