noun
photosensor; light sensor
Technical term in computing and electronics for a device that detects light.
このカメラの感光装置は非常に高感度だ。
The photosensor in this camera is extremely sensitive.
A general term for any sensor, while 感光装置 specifically refers to a light-sensing device.
Compound of 感光 (kankō, 'sensitivity to light') and 装置 (sōchi, 'device').