Image Sensor Power Wiring Layout for Magnetic Noise Reduction
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Solution Overview
Problem
Image noise in imaging apparatuses is exacerbated by increased sensitivity to magnetic field noise due to improved ISO sensitivity, leading to disturbed images and increased current consumption.
Innovation Solution
The imaging apparatus employs a power source wiring configuration with multiple power supply sources, where two power supply sources with lower impedances than one supply power to the imaging device via a network of connection wirings, with at least one connection wiring connecting the power supply sources in the wiring path, to reduce magnetic field noise by dispersing current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ISO sensitivity in the image sensor is improved, then image quality in low light conditions is enhanced, but sensitivity to magnetic field noise increases causing image disturbance
Solution Approach 1:
The power source wiring is divided into multiple independent wiring paths, each connected to separate power supply sources. This segmentation disperses the current flow and reduces magnetic field noise in any single path, thereby mitigating the increased noise sensitivity of high-ISO image sensors while maintaining improved image quality.
2Speed
If higher continuous imaging speed is achieved, then faster moving objects can be imaged, but current consumption increases generating magnetic field noise
Solution Approach 1:
The power source wiring is divided into multiple independent wiring paths, each connected to separate power supply sources. This segmentation disperses the current flow and reduces magnetic field noise in any single path, thereby mitigating the increased noise from high-speed operation while maintaining fast imaging capability.
Solution Approach 2:
Multiple power supply sources are combined to supply power through separate wiring paths. This merging of power sources with distributed wiring reduces the overall magnetic field noise impact on the image sensor, enabling high-speed continuous imaging without excessive current consumption in a single path.
3Device complexity
If single power source supplies power through wiring, then device complexity is low, but magnetic field noise is generated affecting image quality
Solution Approach 1:
The power source wiring is divided into multiple independent wiring paths, each connected to separate power supply sources. This segmentation disperses the current flow and reduces magnetic field noise in any single path, thereby mitigating the increased noise sensitivity of high-ISO image sensors while maintaining improved image quality.
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 effectively reduces image noise by minimizing the magnetic field generated by the power source wiring, improving image quality and reducing current consumption.
Implementation Method 1
a magnetic field is radiated from the power source wiring pattern of the imaging apparatus, and there is a problem that noise is generated in a part of the captured image by the influence of the magnetic field
Implementation Method 2
at a horizontal synchronization frequency of the imaging device, the two power supply sources have lower impedances than the one power supply source
Data Source
AI summary
An imaging apparatus includes: an imaging device in which photoelectric conversion elements are arranged in an array; a wiring component in which the imaging device is mounted and a power source wiring is provided; connection wirings that connects the power source wiring and the imaging device each other; at least two power supply sources connected to the power source wiring; and at least one power supply source connected to the power source wiring, the power supply sources supply power to the imaging device via the power source wiring and the connection wirings, at a horizontal synchronization frequency of the imaging device, the two power supply sources have lower impedances than the one power supply source, and at least one of the connection wirings is connected to a wiring path connecting the two power supply sources in the power source wiring.