Light Emitting Device Calibration Method for Printer Resolution
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Solution Overview
Problem
Existing methods for testing and calibrating the light output of light-emitting devices, such as those used in printers, are inefficient due to the large number of light-emitting elements, which makes precise control and calibration challenging.
Innovation Solution
A method involving measuring the original light output of each light-emitting element, generating a calibration value, and adjusting the light output to achieve a target amount, allowing for efficient testing and calibration through a two-stage check process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of light-emitting elements is increased to achieve high DPI printing resolution, then printing resolution is improved, but the complexity of testing and calibration increases significantly
Solution Approach 1:
The patent divides the light-emitting device into multiple groups, with each group containing multiple light-emitting elements. By measuring and calibrating each group collectively rather than individual elements, the testing complexity is reduced while maintaining the high DPI resolution capability through precise group-level control.
Solution Approach 2:
The patent combines multiple light-emitting elements into groups and measures their cumulative light output together. This merging approach reduces the number of measurements needed compared to testing each element individually, thereby simplifying the testing and calibration process while preserving the high resolution capability.
2Manufacturing precision
If individual light-emitting elements are tested and calibrated to ensure even printing concentration, then printing quality is improved, but the calibration time increases significantly
Solution Approach 1:
The patent applies partial action by measuring and calibrating groups of light-emitting elements rather than every individual element. This approach achieves sufficient printing concentration uniformity through group-level calibration, reducing the overall calibration time while maintaining acceptable printing quality.
Solution Approach 2:
The patent performs preliminary measurement of the cumulative light output for each group of light-emitting elements before actual printing. This preliminary group-level calibration establishes baseline values that guide subsequent individual element adjustment, reducing the total calibration time while ensuring printing concentration uniformity.
3Measurement precision
If precise measurement of each light-emitting element is performed to avoid excessive or inadequate exposure, then exposure accuracy is improved, but the measurement process becomes inefficient
Solution Approach 1:
The patent segments the measurement process into group-level measurements rather than individual element measurements. By measuring the cumulative light output of each group, the system achieves sufficient exposure accuracy while dramatically improving testing efficiency through reduced measurement operations.
Solution Approach 2:
The patent creates a universal calibration approach where group-level measurements serve multiple purposes: they provide exposure accuracy control and establish baseline values for individual element calibration. This multi-functional measurement strategy improves both accuracy and efficiency.
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 approach enables direct calculation of calibration values for individual light-emitting elements, ensuring their output meets expectations, thereby shortening the calibration duration and improving the efficiency of the light-emitting device testing and calibration process.
Implementation Method 1
An even layer of charges is produced on the surface of the photoconductive drum 110 through a power distribution mechanism
Implementation Method 2
When the light emitted from the LEDs is projected on the photoconductive drum 110, original potential is maintained in unexposed areas, while charges in exposed areas vary due to the exposure
Data Source
AI summary
A method for compensating and checking a light amount is applicable to a light-emitting device including a plurality of light-emitting elements, and the following steps are successively executed on the light-emitting elements: measuring an original light amount output by a light-emitting element within a reference time interval; generating a calibration value corresponding to the light-emitting element according to the measured original light amount and a reference light amount; and adjusting light output of the light-emitting element according to the calibration value, so that the original light amount reaches a target light amount.