Image Forming Apparatus Power Mode Control via Human Detection

The patent applies dynamics by making the power mode transition timing adaptive rather than fixed. The system dynamically adjusts when to transition to power-saving mode based on real-time detection of user presence or absence. The human detection unit continuously monitors the operation unit area, and the power-supply control device responds by dynamically changing power modes - maintaining normal mode only while users are present, and transitioning to power-saving mode immediately when users leave, eliminating the fixed predetermined waiting period that causes unnecessary power consumption.

The patent implements feedback by using the human detection unit to continuously monitor user presence and provide real-time information to the power-supply control device. The system receives feedback about whether users are still present at the operation unit, and based on this feedback, automatically adjusts power mode transitions. This feedback mechanism ensures that normal mode is maintained as long as users are present (ensuring convenience), while transitioning to power-saving mode immediately when users leave (reducing power consumption), thus resolving the contradiction between immediate power-saving and user convenience.

The patent replaces the mechanical timer-based control system with a sensor-based detection system. Instead of using a fixed timer that mechanically counts down a predetermined time period, the system uses a human detection unit (optical or motion sensor) to detect user presence or absence. This substitution eliminates the need for predetermined waiting periods while maintaining relatively simple control logic - the power-supply control device simply responds to detection signals by transitioning power modes, achieving both energy efficiency and acceptable control complexity.