Light detection device and light detection system

A light detection system, comprising:

• a light detection device attached to a window of a vehicle;
• a light emitter configured to emit infrared light;
• and
• an optical element attached to the window of the vehicle and configured to cause the infrared light generated by the light emitter to be incident on the light detection device while being reflected by the window of the vehicle,
• wherein the light detection device includes a rain sensor configured to detect rain according to the infrared light received from the light emitter through the optical element, and
• wherein the light emitter and the optical element are provided below the light detection device.

A light detection device, comprising:

• a substrate;
• a plurality of sensors provided on the substrate;
• a light transmitting body made of a light transmitting resin and configured to cover the substrate and the plurality of sensors;
• and
• a light shielding body configured to cover a periphery of the light transmitting body with a shape that shields the periphery of the light transmitting body from light and including an opening at a position facing a substrate surface of the substrate,
• wherein the plurality of sensors are provided on the substrate surface at positions where the plurality of sensors are capable of receiving light incident into the light transmitting body from outside the light shielding body through the opening, and
• wherein the plurality of sensors include:
• a first illuminance sensor configured to detect illuminance according to light received from a direction at a front side of the substrate surface among the light incident into the light transmitting body;
• and
• a second illuminance sensor configured to detect illuminance according to light received from a wider direction than the first illuminance sensor among the light incident into the light transmitting body.