US Patent 9465111 Time-of-flight camera with signal path monitoring

A time-of-flight camera, having a time-of-flight sensor, which has at least one receiving pixel and is configured as a photomixing detector, having an illumination means, and having a modulator, which is connected to the time-of-flight sensor and to the illumination means, wherein a control sensor is arranged in the region of the illumination means such that at least some of the radiation emitted by the illumination means can be received by the control sensor is provided.