Image forming apparatus capable of on-off control of operating key lamp according to anbient illuminance

An image forming apparatus comprising:

• an operating key containing a lamp;
• an illuminance sensor that detects an ambient illuminance;
• and
• a controller that includes a processor and controls, through the processor executing a control program, turning on and off of the lamp,
• wherein the operating key functions as a first trigger for return from a power-saving mode, where power consumption is reduced relative to a normal mode, to the normal mode, and
• the controller turns the lamp off when the ambient illuminance detected by the illuminance sensor in the power-saving mode is equal to or more than a first threshold value, and the controller turns the lamp on when the ambient illuminance detected by the illuminance sensor in the power-saving mode is less than the first threshold value,
• wherein the image forming apparatus further comprising a human detection sensor that has a variable human body detection range for detecting a human body and functions as a second trigger for the return from the power-saving mode to the normal mode,
• wherein the controller sets the human body detection range to a normal range when the ambient illuminance detected by the illuminance sensor in the power-saving mode is equal to or more than a second threshold value, and the controller sets the human body detection range to a wide range relative to the normal range when the ambient illuminance detected by the illuminance sensor in the power-saving mode is less than the second threshold value.