Examination Apparatus Crosstalk Correction for Dual-Eye Detection
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Solution Overview
Problem
Existing examination apparatuses face challenges in simplifying their optical systems while accurately detecting light reflected from both eyes, often resulting in errors due to crosstalk between photoelectric conversion units.
Innovation Solution
The apparatus includes an imaging device with pixels comprising a first and second photoelectric conversion unit, and a processing unit that acquires signals from both eyes, estimates crosstalk amounts based on eye positions, and generates correction signals to mitigate crosstalk influences, allowing for simultaneous guidance of reflected light from both eyes using a single imaging lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two imaging lenses are arranged to guide reflected light from both eyes to separate imaging devices, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines two separate imaging devices into one integrated imaging device with multiple photoelectric conversion units within a single pixel structure. This merging approach maintains the capability to detect reflected light from both eyes while reducing the number of separate imaging components needed in the optical system.
Solution Approach 2:
The patent segments the imaging function at the pixel level by providing multiple photoelectric conversion units (first and second photoelectric conversion units) within a single pixel. This segmentation allows separate detection of reflected light from each eye while using a unified imaging device structure, thereby simplifying the overall optical system.
2Device complexity
If a single imaging device with multiple photoelectric conversion units is used to simplify the optical system, then device complexity is reduced, but measurement precision deteriorates due to signal crosstalk
Solution Approach 1:
The patent extracts and separately processes the signals from different photoelectric conversion units before final integration. By acquiring signals from the first and second photoelectric conversion units separately and then combining them through a synthesis process, the system removes the harmful crosstalk component while preserving the useful detection information.
Solution Approach 2:
The patent implements a feedback mechanism where the system acquires signals from multiple photoelectric conversion units, synthesizes them according to specific synthesis values, and uses this synthesized signal as feedback to correct for crosstalk effects. This feedback loop enables the system to compensate for the negative impacts of signal mixing while maintaining the simplified optical structure.
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 configuration simplifies the optical system, enhances accuracy in detecting light from both eyes by correcting for crosstalk, and improves the measurement of the fixation state of the subject.
Implementation Method 1
The imaging device includes a plurality of pixels IP, and each of the pixels IP includes a first photoelectric conversion unit PD1 and a second photoelectric conversion unit PD2
Data Source
AI summary
An examination apparatus detecting first reflected light from a first eye of a subject and second reflected light from a second eye of the subject includes an imaging device, and a processing unit. The imaging device includes pixels each including a first photoelectric conversion unit and a second photoelectric conversion unit. The processing unit includes a unit configured to acquire a first signal based on the first reflected light entering the first photoelectric conversion units and a second signal based on the second reflected light entering the second photoelectric conversion units, a unit configured to acquire crosstalk amounts of the first and second signals based on information about positions of the first and second eyes, and a unit configured to generate correction signals based on the first and second signals and amounts of the crosstalk.