Imaging device, inspection device, and imaging method

An imaging device comprising two cameras that capture two transmission images of a subject by receiving light transmitted through the subject from opposite directions:

• a first light source that emits light that is transmitted through the subject in a first direction;
• a second light source that emits light that is transmitted through the subject in a second direction that is opposite to the first direction;
• a first camera that is one of the two cameras and captures a first image by receiving first transmitted light transmitted through the subject in the first direction;
• a second camera that is the other of the two cameras and captures a second image by receiving second transmitted light transmitted through the subject in the second direction;
• a first half mirror that reflects the first transmitted light at an intermediate position on an optical path of the first transmitted light along an optical path toward the first camera while the second light source is turned off, and permits transmission of light traveling from the second light source toward the subject at an intermediate position on an optical path of the light;
• and
• a second half mirror that reflects the second transmitted light at an intermediate position on an optical path of the second transmitted light along an optical path toward the second camera while the first light source is turned off, and permits transmission of light traveling from the first light source toward the subject at an intermediate position on an optical path of the light, and
• a third light source capable of applying light to the subject, wherein
• the first camera captures a third image by receiving light that has been applied to the subject from the third light source, reflected on a surface of the subject, and then reflected on the first half mirror, and
• the second camera captures a fourth image by receiving light that has been applied to the subject from the third light source, reflected on a surface of the subject, and then reflected on the second half mirror.