Contact Image Sensor Scan Control for Lower Power Waste
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Solution Overview
Problem
Existing image sensors experience significant power wastage during object detection due to continuous scanning and illumination, especially when the object is stationary or moving slowly, leading to inefficient power consumption and unfavorable user experience.
Innovation Solution
A contact image sensor with a control unit that includes a comparator and register to compare encoder output pulses with a preset scanning cycle, determining valid and invalid scanning cycles, and adjusting illumination duration and intensity accordingly, along with a data output unit to filter out invalid data, thereby reducing power wastage and improving data validity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the image sensor continuously scans and illuminates the object to be detected, then the scanning coverage is improved, but the power consumption increases significantly
Solution Approach 1:
The patent implements periodic scanning by dividing the scanning process into valid scanning cycles and invalid scanning cycles. The control unit determines whether each scanning cycle is valid based on encoder feedback, and only performs illumination and scanning during valid cycles. This periodic action pattern eliminates continuous operation, thereby reducing power consumption while maintaining necessary scanning coverage.
Solution Approach 2:
The patent dynamically adjusts the scanning operation based on real-time object movement status. The control unit receives encoder feedback and dynamically determines the validity of each scanning cycle, enabling the system to adapt its scanning behavior to actual conditions. This dynamic approach ensures scanning occurs only when necessary, optimizing the balance between coverage and power consumption.
2Measurement precision
If the illumination unit illuminates the object continuously, then the scanning quality is improved, but the power wastage increases
Solution Approach 1:
The illumination unit operates periodically rather than continuously, being activated only during valid scanning cycles determined by the control unit. This periodic illumination maintains scanning quality during necessary operations while eliminating energy waste during periods when the object is stationary or movement is insufficient, directly addressing the contradiction between quality and energy loss.
Solution Approach 2:
The patent applies illumination selectively based on local conditions - specifically, whether the object is moving sufficiently during each scanning cycle. The control unit evaluates encoder feedback to determine local validity of each cycle, and activates illumination only in those specific instances. This localized quality approach ensures high scanning quality where needed while avoiding energy waste elsewhere.
3Productivity
If the image sensor scans at a fixed high speed, then the productivity is improved, but the power consumption increases and data validity decreases when object moves slowly
Solution Approach 1:
The patent dynamically adjusts scanning operation based on actual object movement speed detected by the encoder. Rather than maintaining a fixed high-speed scanning regime, the control unit evaluates whether the object is moving sufficiently to warrant scanning in each cycle. This dynamic adaptation maintains high productivity when objects are moving while ensuring data validity by avoiding scanning when objects are stationary or moving too slowly.
Solution Approach 2:
The system employs encoder feedback to continuously monitor object movement and use this information to determine the validity of each scanning cycle. The control unit receives encoder signals and uses this feedback to make real-time decisions about whether to perform scanning and illumination. This feedback mechanism ensures that scanning speed and data collection are aligned with actual object movement, maintaining both productivity and data validity.
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 optimizing illumination duration and intensity based on object movement, ensuring efficient scanning and improving the validity of scanning data.
Implementation Method 1
the illumination unit 12 performs illumination using a light-emitting diode
Implementation Method 2
the scanning unit 13 is further configured to receive, based on the scanning trigger signal, an optical signal generated from the object to be detected under illumination of the illumination unit 12, and convert the optical signal into an electrical signal to obtain a scanning signal
Data Source
AI summary
A contact image sensor is provided, including: a control unit configured to receive output pulses from an encoder, where the control unit includes a comparator configured to compare the output pulses with a preset scanning cycle stored in the register to obtain an illumination control signal; an illumination unit configured to illuminate an object to be detected based on the illumination control signal; a scanning unit configured to scan the object to be detected based on the scanning trigger signal to obtain a scanning signal; a data processing unit configured to process the scanning signal to obtain an initial scanning result; and a data output unit configured to obtain a target scanning result based on the initial scanning result and output the target scanning result based on the output trigger signal.