Off-axis light emitting device and image capturing module using the same

An off-axis light-emitting device, comprising:

• a substrate having a mounting surface;
• a light-emitting chip for generating a light beam disposed on the mounting surface;
• and
• an optical element disposed on the mounting surface and including a dome portion,
• wherein the dome portion is arranged in an optical path of the light beam and extends in a first direction to form an elongated shape, and the dome portion has a first reference plane that passes through two opposite side surfaces of the dome portion;
• wherein the first reference plane is a cross-sectional plane corresponding to a longitudinal axial centerline of the dome portion, and the dome portion has a symmetrical shape with respect to the first reference plane;
• and
• wherein the first reference plane is offset from a geometric center of the light-emitting chip in a second direction, so that the light beam passing through the dome portion forms an off-axis projection light;
• wherein the first reference plane is parallel to the first direction and is vertical to the second direction, the dome portion includes a first region and a second region, a radiant intensity in a first measuring region above the first region where the light-emitting chip is placed below is less than a radiant intensity in a second measuring region above the second region where the light-emitting chip is not placed below.