Photosensor Control Unit for Power Mode Switching
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Solution Overview
Problem
In multifunctional apparatuses that switch operation modes based on photosensor detection results, erroneous detections due to chattering or shaking can cause premature transitions from low-power sleep mode to high-power normal mode, leading to increased power consumption.
Innovation Solution
A processing apparatus with a photosensor and control unit that emits light for specific periods, detects signals at shorter intervals, and determines the operational mode based on multiple detection results to minimize erroneous mode changes and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the operation mode is switched to sleep mode to reduce power consumption, then power consumption is reduced, but erroneous detection results may cause premature transition to normal mode
Solution Approach 1:
The system performs preliminary detection actions by emitting light for a first light emission period and detecting light receiving signals at multiple intervals before making a mode transition decision. This preliminary detection phase allows the system to anticipate potential erroneous detections and validate the detection result before switching from sleep mode to normal mode, thereby maintaining detection accuracy while preserving power savings.
Solution Approach 2:
The system implements feedback by comparing multiple light receiving signals detected at different intervals during the first light emission period. The control unit analyzes the consistency of these detection results and only transitions to normal mode when the detection result is confirmed as valid through this feedback mechanism, preventing premature mode transitions caused by erroneous detections while maintaining reliable operation.
2Use of energy by moving object
If light emission period is shortened to reduce power consumption, then power consumption is reduced, but detection reliability may be compromised
Solution Approach 1:
The system employs periodic action by emitting light intermittently at specific intervals during the detection period rather than continuously. The light emitting element emits light for the first light emission period with detection intervals shorter than the emission period, creating a periodic detection pattern that reduces overall light emission duration and power consumption while maintaining sufficient detection reliability through multiple sampling points.
3Measurement precision
If multiple detection intervals are used to improve detection accuracy, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system applies segmentation by dividing the detection process into distinct time intervals within the first light emission period. The control unit detects light receiving signals at multiple discrete intervals rather than continuously, segmenting the detection task into manageable discrete measurements. This approach improves detection accuracy by capturing state changes at critical moments while keeping system complexity manageable through structured temporal segmentation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power consumption by stabilizing light emission and minimizing erroneous detections, maintaining the apparatus in a low-power mode unless a valid detection is confirmed, thus achieving better power savings.
Implementation Method 1
a photosensor including a light emitting element and a light receiving element... the light receiving element receives light emitted from the light emitting element and outputs a light receiving signal according to an amount of the received light
Data Source
AI summary
A processing apparatus includes a photosensor, a processing unit and a control unit. The control unit detects a light receiving signal output from the photosensor during a first light emission period and obtains a first detection result, and makes first determination based on the first detection result by determining whether the processing unit can execute a function. The control unit detects the light receiving signal after a waiting period and obtains a second detection result. The control unit makes second determination based on the second detection result by determining whether the processing unit can execute the function. The control unit makes the second determination in a second mode that requires small consumption power, and according to determination in the second determination in the second mode that the processing unit can execute the function, the control unit keeps the second mode and makes the first determination.