Image Pickup Apparatus Rotation Unit for Isotropic Spatial Frequency Acquisition
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Solution Overview
Problem
Current image pickup apparatuses face limitations in isotropically acquiring spatial frequency information of samples due to restricted acquisition ranges and missing regions, particularly when rotating samples around a single axis, which hampers accurate refractive index calculation and spatial frequency reconstruction.
Innovation Solution
The apparatus incorporates a signal acquisition unit with a light source and photodetector, and a rotation unit that rotates the sample and signal acquisition unit relative to each other about a first axis intersecting the optical axis, allowing for irradiation with light beams at multiple incident angles in a plane including the optical axis and the first axis, thereby expanding the acquisition range and reducing missing regions through multidirectional irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sample is rotated around a single axis, then the apparatus configuration is simplified, but the acquisition range of spatial frequency information is restricted and missing regions occur
Solution Approach 1:
The patent introduces a second rotation axis perpendicular to the first rotation axis. The sample is rotated around the first axis, and the illumination unit is rotated around the second axis, enabling multidirectional irradiation and expanding the acquisition range of spatial frequency information from a single plane to three-dimensional space, thereby eliminating missing regions.
2Loss of information
If light beams are irradiated at multiple incident angles, then the acquisition range of spatial frequency information is expanded, but the device complexity increases
Solution Approach 1:
The illumination unit is designed to perform multiple functions: it can rotate around the second axis to change irradiation directions, and it can also adjust incident angles independently. This multi-functional design allows a single illumination unit to achieve multidirectional irradiation and multiple incident angles, expanding spatial frequency acquisition without proportionally increasing device complexity.
Solution Approach 2:
The patent employs dynamic rotation mechanisms where the illumination unit can rotate around the second axis and adjust incident angles dynamically during measurement. This dynamic capability allows the system to acquire spatial frequency information from multiple directions and angles, expanding the acquisition range while maintaining a relatively compact apparatus configuration through coordinated motion.
3Loss of information
If the illumination unit rotates around a second axis perpendicular to the first axis, then multidirectional irradiation is achieved and missing regions are reduced, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric rotation mechanisms where the illumination unit rotates around a second axis that is perpendicular to the first rotation axis of the sample. This asymmetric dual-axis rotation configuration enables the illumination unit to approach the sample from multiple directions, achieving multidirectional irradiation and reducing missing regions in spatial frequency acquisition, while maintaining a manageable device complexity through optimized mechanical design.
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 enables isotropic acquisition of spatial frequency information, increasing the number of scattering potentials and improving the accuracy of refractive index determination and spatial frequency reconstruction, while simplifying the apparatus configuration and reducing the missing region size.
Implementation Method 1
an illumination unit including a light source and configured to irradiate a sample with a light beam, a photodetector including a plurality of light-receiving portions two-dimensionally arranged, and a detection optical system configured to guide light having been irradiated from the illumination unit to the sample and passed through the sample, to the photodetector
Implementation Method 2
the rotation unit rotates the sample and the signal acquisition unit relative to each other, about a first axis intersecting an optical axis of the detection optical system in the sample
Data Source
AI summary
An image pickup apparatus includes a signal acquisition unit and a rotation unit. The signal acquisition unit includes an illumination unit including a light source and configured to irradiate a sample with a light beam, a photodetector including a plurality of light-receiving portions two-dimensionally arranged, and a detection optical system configured to guide light having been irradiated from the illumination unit to the sample and passed through the sample, to the photodetector. The rotation unit rotates the sample and the signal acquisition unit relative to each other, about a first axis intersecting an optical axis of the detection optical system in the sample. The illumination unit irradiates the sample with light beams at two or more incident angles in a plane including the optical axis and the first axis.