Exposure apparatus and image-forming apparatus

An image-forming apparatus comprising:

• a photosensitive member;
• and
• an exposure apparatus for exposing the photosensitive member with light,
• wherein the exposure apparatus includes:
• a first light-emitting chip that includes a plurality of first light-emitting portions arranged along an axial direction of the photosensitive member and is configured to supply a first driving current to the plurality of first light-emitting portions;
• a second light-emitting chip, arranged at a different position from the first light-emitting chip in the axial direction, that includes a plurality of second light-emitting portions arranged along the axial direction and is configured to supply a second driving current to the plurality of second light-emitting portions;
• and
• a control unit configured to output image data that is a set of binary bits each indicating a first value or a second value,
• wherein a first part of the image data is output to the first light-emitting chip and a second part of the image data is output to the second light-emitting chip, and
• the control unit is configured to:
• control the first driving current based on the number of bits indicating the first value in the first part of the image data;
• and
• control the second driving current based on the number of bits indicating the first value in the second part of the image data.