Pupil Filter Layout for Multispectral Imaging Crosstalk Control

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Solution Overview

Problem

Existing optical systems face challenges in simultaneously acquiring multiple images with different optical conditions while minimizing crosstalk and achieving balanced light distribution across aperture regions.

Innovation Solution

A lens device comprising a first polarizing filter, wavelength selective filters, and optical path length-correcting filters, with adjustable polarization directions and ND filters, is disposed at a pupil position to correct chromatic aberration and balance light amounts across aperture regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple aperture regions are used to capture different wavelength ranges, then multispectral imaging capability is improved, but crosstalk between adjacent aperture regions increases

Engineering Contradiction:

Improvemultispectral imaging capabilityVSAvoidcrosstalk between aperture regions

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by assigning different polarization directions to different aperture regions through the second polarizing filter. Each aperture region has optimized local polarization characteristics that match its specific wavelength range, thereby reducing crosstalk while maintaining multispectral imaging capability. The first polarizing part also has regions with different polarization directions corresponding to different aperture regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite polarizing structures combining a first polarizing part and a second polarizing filter with multiple aperture regions. This composite structure integrates wavelength-selective filtering and polarization control in a unified system, enabling simultaneous spectral separation and crosstalk reduction across multiple aperture regions.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If polarizing filters are added to control light amounts in different aperture regions, then light balance is improved, but device complexity increases

Engineering Contradiction:

Improvelight balance across aperture regionsVSAvoidstructure with multiple polarizing components

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent merges the light control function and polarization control function into a single integrated filter unit. The second polarizing filter with multiple aperture regions simultaneously performs wavelength selection and light amount control, eliminating the need for separate neutral density filters or additional light control mechanisms for each aperture region.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The second polarizing filter serves multiple functions: it acts as a wavelength-selective filter for different aperture regions, a polarizing element for crosstalk reduction, and a light control mechanism for balancing illumination across regions. This multi-functionality reduces overall device complexity despite adding polarization control capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The solution enables efficient multispectral imaging by reducing crosstalk and achieving balanced light distribution across aperture regions, improving image quality and spectral accuracy.

Implementation Method 1

a first polarizing part that polarizes at least a part of rays transmitted through the imaging optical system

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

a plurality of wavelength selective filters disposed in the first aperture region and the second aperture region and transmitting pieces of light of which at least a part of wavelength ranges are different from each other

Methodology Applied

Scientific EffectWavelength selective filtering: Absorption (EM radiation)

Implementation Method 3

a second polarizing filter including a plurality of polarizing filters disposed in the first aperture region and the second aperture region and having polarization directions different from each other

Methodology Applied

Scientific EffectPolarization filtering: Polarisation

Data Source

PatentUS20230319385A1Optical member, lens device, and imaging apparatus

Publication Date: 2023.10.05 FUJIFILM CORP

AI summary

An optical member includes aperture regions, a lens device, and an imaging apparatus. A lens device includes: an imaging optical system; a first polarizing part that polarizes at least a part of rays transmitted through the imaging optical system; and a filter unit that is disposed at a pupil position of the imaging optical system or near the pupil position, and includes aperture regions transmitting the rays of the imaging optical system and including a first aperture region and a second aperture region, wavelength selective filters disposed in the first aperture region and the second aperture region and transmitting pieces of light of which at least a part of wavelength ranges are different from each other, and a second polarizing filter including polarizing filters disposed in the first aperture region and the second aperture region and having polarization directions different from each other.