Distance Image Capture Adjustment Phase for Uniform Charge Accumulation
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Solution Overview
Problem
The accuracy of distance image capturing devices is compromised due to differences in driving conditions among charge accumulation units, leading to inconsistent charge accumulation, which affects the precision of distance measurement.
Innovation Solution
A distance image capturing device and method that synchronizes the driving conditions of charge accumulation units by introducing an adjustment phase where the charge discharge unit is controlled to either not discharge or discharge charges, ensuring uniform accumulation and discharge times across all units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the accumulation phase time is set relatively short and discharge phase time is set relatively long, then the productivity of the imaging device is improved, but the measurement precision deteriorates due to inconsistent charge accumulation conditions
Solution Approach 1:
The invention introduces an adjustment phase before the first charge accumulation unit starts accumulating charges. During this adjustment phase, the charge discharge unit is controlled to maintain a discharged state, ensuring that the first charge accumulation unit starts from a consistent initial condition. This preliminary action synchronizes the driving conditions across all charge accumulation units, allowing short accumulation times to be used without sacrificing measurement precision.
2Reliability
If the charge discharge unit continuously discharges charges, then the reliability of charge accumulation is improved, but the manufacturing precision deteriorates due to varying discharge states across different accumulation units
Solution Approach 1:
The invention divides the charge accumulation process into multiple distinct phases: adjustment phase, accumulation phase, and discharge phase. Each phase is controlled independently with specific timing and control signals. This segmentation allows precise control over when each charge accumulation unit accumulates and discharges charges, ensuring uniform discharge states across all units while maintaining reliable charge accumulation.
Solution Approach 2:
The invention implements periodic cycling through adjustment phase, accumulation phase, and discharge phase for each charge accumulation unit. This periodic action ensures that each unit undergoes the same sequence of operations with consistent timing, creating uniform driving conditions across all units while maintaining reliable charge accumulation through regular discharge cycles.
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 synchronization of driving conditions enhances the accuracy of distance measurements by minimizing variations in charge accumulation, thereby improving the overall precision of the device.
Implementation Method 1
a photoelectric conversion element configured to generate a charge in accordance with incident light
Implementation Method 2
measures a distance between a measuring instrument and an object based on a flight time of light in space
Data Source
AI summary
A distance image capturing device executes a driving for a unit accumulation period the number of accumulation times, executes an accumulation phase, and a discharge phase, and executes an adjustment phase at a timing at which the discharge phase for the previously executed unit accumulation period is switched to the unit accumulation period to be executed this time is executed, and sequentially executes a first driving in which the charge discharge unit is caused not to discharge the charge and the charge is not accumulated in the charge accumulation unit, and a second driving in which the charge is discharged through the charge discharge unit in the adjustment phase, in which a time for executing the second driving is the same as an accumulation driving time for executing an accumulation driving in which the charge is accumulated in one charge accumulation unit in the accumulation phase.