Scan Head Aiming Beam Timing Control to Prevent Overexposure
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Solution Overview
Problem
Existing 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.
Innovation Solution
A control circuit is used to separate the decoding time of the camera and the lightening time of the aiming lamp by outputting the field sync signal, ensuring the decoding process occurs within the effective picture zone, preventing local overexposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the aiming lamp and supplementary lamp are switched on concurrently when starting the camera, then the aiming beam can guide the operator to scan code, but the aiming beam causes local overexposure during code decoding
Solution Approach 1:
The patent applies periodic action by controlling the aiming lamp to operate only during blanking time periods when the camera is not decoding, while the supplementary lamp operates during effective picture zones when decoding occurs. This time-division control eliminates overexposure while maintaining the aiming beam's guiding function.
Solution Approach 2:
The patent uses preliminary action by outputting field sync signals from the camera to pre-coordinate the timing of the aiming lamp and supplementary lamp. The blanking time signal triggers the aiming lamp before the effective picture zone begins, ensuring proper sequencing without overexposure.
2Ease of operation
If the aiming lamp operates during decoding time, then the guiding function is maintained, but the identification rate and decoding speed are reduced
Solution Approach 1:
The patent implements periodic action by synchronizing the aiming lamp operation with blanking time periods and the supplementary lamp with effective picture zones. This ensures the guiding function is maintained during blanking while decoding proceeds without interference during effective zones, maximizing decoding speed.
3Ease of operation
If the aiming lamp and supplementary lamp operate concurrently, then both guiding and illumination functions are provided, but power consumption increases
Solution Approach 1:
The patent applies periodic action by controlling the aiming lamp and supplementary lamp to operate during different time periods based on field sync signals. The aiming lamp operates during blanking time while the supplementary lamp operates during effective picture zones, ensuring both functions are provided while minimizing simultaneous operation and reducing power consumption.
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 significantly improves decoding accuracy, stability, identification rate, and power consumption while avoiding overexposure, making the scan head more cost-effective.
Implementation Method 1
a source electrode of the field effect transistor Q1 is connected with a second resistor R2, le second resistor R2 is connected with a light-emitting diode D1, and the light-emitting diode D1 is grounded
Data Source
Figure 1~2
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.