Detection device for detecting state of waste toner container and image forming apparatus using such detection device

An image forming apparatus comprising:

• a printing engine;
• a waste toner container, detachably disposed, for storing a waste toner removed from the printing engine;
• and
• a detection device for detecting a state of the waste toner container, comprising:
• a first optical sensor comprising a first emitting unit configured to emit a first optical signal and a first receiving unit configured to receive the first optical signal, wherein a space is provided between the first emitting unit and the first receiving unit, and the first optical signal travels along an optical path from the first emitting unit to the first receiving unit;
• and an actuation member movably disposed between the first emitting unit and the first receiving unit;
• wherein the actuation member in a first position interrupts the optical path of the first optical signal;
• and the actuation member is moved by the waste toner container to a second position when the waste toner container is in an installed position, wherein the actuation member in the second position allows a passage of the first optical signal.