Image Pickup Unit Analog Ground Wiring Noise Cancellation
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Solution Overview
Problem
Image pickup elements in cameras are susceptible to magnetic field noise from external sources, such as coils in lens barrels and camera bodies, which can disrupt image quality by introducing noise and pattern disturbances.
Innovation Solution
The image pickup unit incorporates a wiring board with a closed loop analog ground wiring configuration, where the image pickup element is mounted on a wiring board with a first ground wiring forming a closed loop with the analog ground wiring and a second ground wiring connected via a limited number of via conductors, optimizing the loop's area to reduce magnetic noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the ISO sensitivity of the image pickup element is increased, then image quality in low-light scenes is improved, but sensitivity to magnetic field noise increases causing image disturbance
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the magnetic field noise generated by the coil to cancel out the harmful noise through a specifically designed closed loop circuit. The noise that would normally disturb the image pickup element is instead harnessed to create a cancellation effect, where the magnetic field noise from the coil interacts with the closed loop ground wiring to produce an opposing field that reduces the net noise at the image pickup element.
Solution Approach 2:
The patent introduces an intermediary element in the form of a closed loop ground wiring configuration that mediates between the noise source (coil) and the sensitive component (image pickup element). This intermediary circuit structure acts as a buffer, allowing the magnetic field noise to be managed and cancelled before it reaches the image pickup element, thereby protecting the sensitive analog circuitry from direct noise exposure.
2Power
If a coil is used to drive the lens or sensor, then the lens or sensor can be driven effectively, but magnetic field noise is generated and transmitted to the image pickup element
Solution Approach 1:
The patent converts the harmful magnetic field noise generated by the coil into a beneficial cancellation effect. By designing a closed loop ground wiring that interacts with the coil's magnetic field, the noise that would normally be harmful is transformed into a useful opposing field that reduces the net noise at the image pickup element, effectively using the coil's own generated noise against itself.
Solution Approach 2:
The patent extracts the magnetic field noise from the path to the image pickup element by introducing a separate closed loop ground wiring configuration. This extracted noise path allows the magnetic field to be managed and cancelled independently from the signal path, separating the harmful effect from the sensitive component while maintaining the coil's driving function.
3Object-affected harmful factors
If external magnetic field noise reaches the image pickup unit, then the image pickup element is exposed to noise, but preventing this requires complex shielding structures
Solution Approach 1:
The patent introduces an intermediary ground wiring configuration that mediates between external magnetic field noise and the image pickup element. Rather than using complex physical shielding, the closed loop ground wiring acts as an electromagnetic intermediary that manages and cancels noise through its circuit configuration, simplifying the overall structure while providing effective noise protection.
Solution Approach 2:
The patent replaces mechanical shielding structures with an electromagnetic field-based solution. Instead of using physical barriers to block magnetic field noise, the invention uses a closed loop ground wiring configuration that actively manages noise through electromagnetic induction and cancellation, substituting a complex mechanical shielding system with a simpler electrical circuit approach.
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 suppresses magnetic field noise-induced disturbances, improving image quality by reducing voltage fluctuations and pattern noise in the output images.
Implementation Method 1
a magnetic field noise that reaches an image pickup chip is reduced as a result of magnetic field noises radiated respectively from a power source pattern and a ground pattern of a board on which the image pickup chip is mounted by an operation of a processing circuit of the image pickup chip cancelling each other
Data Source
AI summary
An image pickup unit includes an image pickup element and a wiring board. The image pickup element includes an analog circuit. The analog circuit includes an analog ground wiring. The image pickup element is mounted on the wiring board. The wiring board includes a first ground wiring that is connected to the analog ground wiring and forms a closed loop with the analog ground wiring in a side view of the image pickup unit, and a second ground wiring that is connected to the first ground wiring via only a first via conductor.