Scan Head Aiming Lamp Timing Circuit for Overexposure-Free Decoding
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Solution Overview
Problem
Conventional two-dimensional code scan heads face issues with decoding accuracy, stability, identification rate, and power consumption due to the aiming lamp's small-area light source causing overexposure during code decoding, which affects the clarity of the image needed for accurate code identification.
Innovation Solution
Aiming beam exposure solution system with a control circuit that separates the decoding and lighting times using the field sync signal, ensuring the aiming lamp is only active during the effective picture zone, preventing overexposure and allowing the camera to decode within this zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the aiming lamp is used to guide the operator to scan code, then the positioning guide function is improved, but the small-area light source covers the code to be identified causing overexposure
Solution Approach 1:
The patent segments the operation timeline into distinct phases: positioning phase (aiming lamp on, camera off) and decoding phase (aiming lamp off, camera on). This temporal segmentation allows the aiming lamp to guide the operator without interfering with the decoding process, resolving the contradiction between positioning guidance and decoding accuracy.
Solution Approach 2:
The patent implements periodic switching between the aiming lamp and camera operations. The aiming lamp operates periodically to guide positioning, then turns off during the decoding period. This periodic action pattern ensures that the light source does not continuously expose the code area, maintaining both guidance functionality and decoding accuracy.
2Illumination intensity
If the supplementary lamp and aiming lamp are switched on concurrently when starting the camera, then the lighting coverage is improved, but the aiming beam causes overexposure during code decoding
Solution Approach 1:
The patent segments the lighting and imaging functions into separate operational phases. The supplementary lamp remains on continuously for lighting coverage, while the aiming lamp is segmented into discrete guidance bursts that occur only when the camera is not actively decoding, preventing overexposure during critical decoding moments.
Solution Approach 2:
The patent uses preliminary action by having the aiming lamp activate briefly before the camera starts decoding to position the code in the correct field of view. This preliminary positioning action ensures the code is properly framed before the camera begins its decoding operation, eliminating the need for concurrent operation that would cause overexposure.
3Reliability
If the aiming lamp remains on during camera decoding, then the positioning guide function is maintained, but the decoding time and lightening time overlap causing overexposure
Solution Approach 1:
The patent segments the operational timeline into distinct positioning intervals and decoding intervals. During positioning intervals, the aiming lamp is active to maintain guidance reliability. During decoding intervals, the aiming lamp is turned off to prevent overexposure and ensure maximum decoding speed. This segmentation resolves the conflict between continuous guidance and efficient decoding.
Solution Approach 2:
The patent implements periodic switching where the aiming lamp operates in regular cycles: on during positioning phases to maintain guide reliability, off during decoding phases to enable high-speed decoding without overexposure. This periodic pattern maintains reliability when needed while maximizing productivity during decoding operations.
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
This solution effectively prevents overexposure, enhancing decoding accuracy, stability, identification rate, and power efficiency of the scan head while maintaining cost-effectiveness.
Implementation Method 1
the source electrode of the field effect transistor is connected with the resistor R2 and the light-emitting diode respectively, and is grounded thereof
Data Source
AI summary
The invention discloses a scan head's aiming beam exposure solution system, comprising the control circuit of aiming lamp. The control circuit is composed of 5 pin terminals, wherein pin 1 and 2 are the input terminal of gate circuit, and pin 4 is the output terminal of NOT gate circuit; the high level Vcc is connected with pin 5 of the control circuit, and pin 3 of the control circuit is grounded; the pin 1 and 2 are connected with the scanning signal and the field sync signal respectively, and resistor R1 is connected with the field sync signal and is grounded. The solution system, compared with the existing scan heads on the market, can completely solve the local overexposure problem of the aiming beam, hugely improve the decoding accuracy, stability, identification rate, decoding speed and power consumption of the scan head hugely, and realize cost-effectiveness easily.