Beam Center Detection Using Dynamic Delay Adjustment
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately detecting the center position of a beam due to fluctuations in the high-level potential of the photodiode output, leading to inconsistent timing for light intensity adjustment, which affects the precision of beam scanning.
Innovation Solution
An image forming apparatus that includes a light source, a deflector, a light receiving element, a converter, and a calculator to convert detection signals into data values and calculate the beam center position, allowing for accurate detection of beam centers by analyzing the entire waveform, not just the rise of pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the delay time from the COMP output is fixed, then the device complexity is reduced, but the measurement precision of beam center position deteriorates due to fluctuations in PD output high-level potential
Solution Approach 1:
The patent applies dynamics by making the delay time variable rather than fixed. The delay time is dynamically adjusted based on the actual rise characteristics of the PD output signal, allowing the delay circuit to adapt to fluctuations in high-level potential and ensure accurate beam center detection despite varying signal conditions
Solution Approach 2:
The patent implements feedback by using the detected beam center position information to adjust the delay time for subsequent measurements. The system continuously monitors the PD output characteristics and modifies the delay circuit parameters accordingly, creating a closed-loop control that maintains measurement precision under varying conditions
2Adaptability or versatility
If the PD output high-level potential fluctuates, then the adaptability to different light intensity conditions is improved, but the reliability of light intensity adjustment timing deteriorates
Solution Approach 1:
The system dynamically adjusts the delay time based on the actual PD output characteristics for each light intensity condition. This dynamic adaptation allows the system to maintain reliable timing across a wide range of light intensities, as the delay is optimized for each specific operating condition rather than using a fixed value
Solution Approach 2:
The patent changes the delay time parameter according to the PD output signal characteristics. By monitoring the rise time and high-level potential of the PD output and adjusting the delay parameter accordingly, the system maintains reliable adjustment timing across varying light intensity conditions while preserving adaptability
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 enables precise detection of beam centers and pitch adjustments, improving the accuracy of beam scanning and image formation by considering the entire detection signal waveform, regardless of the steepness or gradualness of the signal rise.
Implementation Method 1
a light receiving element for receiving the beam and generating a detection signal
Data Source
AI summary
An image forming apparatus having: a light source for emitting a beam; a deflector for deflecting the beam; a light receiving element for receiving the beam and generating a detection signal; a converter for converting electric potentials of the detection signal into data values and generating time data associated with the data values; and a first calculator for calculating a position of center of the beam from the data values and the time data.