Photosensor

A photosensor comprising:

• a support;
• a thermoelectric conversion material section that is disposed on a first main surface of the support and that includes a plurality of first material layers each having an elongated shape and a plurality of second material layers each having electrical conductivity and an elongated shape, the first material layers and the second material layers each being configured to convert thermal energy into electrical energy;
• a heat sink that is disposed on a second main surface of the support and along an outer edge of the support;
• a light-absorbing film that is disposed in a region surrounded by inner edges of the heat sink as viewed in a thickness direction of the support so as to form temperature differences on the first main surface of the support in longitudinal directions of the first material layers, the light-absorbing film being configured to convert received light into thermal energy;
• a first electrode;
• and
• a second electrode spaced apart from the first electrode,
• wherein each first material layer includes a first region including a first end on one side in the corresponding longitudinal direction and a second region including a second end on the other side in the corresponding longitudinal direction,
• each second material layer includes a third region including a third end on one side in the corresponding longitudinal direction and a fourth region including a fourth end on the other side in the corresponding longitudinal direction,
• the first region and the second region are respectively connected to the third region and the fourth region, so that the first material layers and the second material layers are alternately connected to each other in series,
• the endmost first material layer is connected to the first electrode, and the endmost second material layer is connected to the second electrode, and
• the first region is disposed in a region between outer edges of the light-absorbing film and the inner edges of the heat sink as viewed in the thickness direction of the support.