Probe Magnet Sensor Positioning for Lens Sensitivity
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Solution Overview
Problem
Current camera technologies face challenges in accurately controlling the motion of optical components for features like autofocus and optical image stabilization, particularly in detecting small changes in the location of optical lenses due to attenuation of magnetic flux regions with increased distance from the probe magnet sensor.
Innovation Solution
The implementation of a probe magnet sensor placed closer to the optics component within a camera, utilizing a stronger probe magnet and specific positioning strategies such as mounting on the OIS coil carrier to reduce the distance and enhance sensitivity, allowing for more precise detection of optical component movements along the X, Y, and Z axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the probe magnet sensor is placed farther from the optics component, then the sensor can be positioned more easily and avoid interference with other components, but the sensitivity of the sensor decreases due to magnetic flux attenuation
Solution Approach 1:
The patent changes the magnetic field parameters by using a stronger probe magnet with higher magnetic flux density. This allows the sensor to maintain high sensitivity even when positioned at a greater distance from the optics component, resolving the contradiction between positioning ease and sensor sensitivity.
2Measurement precision
If a stronger probe magnet is used, then the sensor sensitivity increases, but the magnetic flux region may overlap with drive magnet flux regions causing interference
Solution Approach 1:
The patent positions the probe magnet on the Z-axis (optical axis) while drive magnets are positioned on the X and Y axes. This spatial separation in different dimensions allows the use of a stronger probe magnet without magnetic flux overlap interference from drive magnets.
Solution Approach 2:
The patent creates a localized strong magnetic field region around the probe magnet by positioning it strategically on the Z-axis. This localized field enhancement improves sensor sensitivity without causing widespread interference with other magnetic components in different spatial regions.
3Measurement precision
If the probe magnet is positioned to maximize flux region coverage, then detection capability improves, but the distance to the optics component increases causing flux attenuation
Solution Approach 1:
The patent enhances the magnetic flux density parameter of the probe magnet, allowing it to maintain strong field strength over a larger spatial coverage area. This enables the probe magnet to be positioned for optimal detection capability while compensating for flux attenuation through increased field strength.
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 solution significantly increases the sensitivity of the probe magnet sensor, enabling more accurate and efficient optical image stabilization and autofocus capabilities by effectively reducing attenuation effects and improving the detection of smaller changes in magnetic flux regions.
Implementation Method 1
A camera may include a probe magnet sensor (also referred to herein as a position sensor) for the optical lens to determine a current location of the optical lens according to changes in a flux region emitted by a probe magnet included in the camera.
Implementation Method 2
The position sensor may be placed on a coil of the actuator to decrease the distance between the position sensor and the probe magnet.
Data Source
AI summary
Increases to the sensitivity of a probe magnet sensor are implemented for a camera lens. Probe magnet sensors may be located on carrier of a surface of an actuator coil to reduce the distance between the probe magnet sensor and a probe magnet mounted on an optics component that includes the camera lens. A probe magnet may be located within the camera so that the flux region of the probe magnet does not overlap with a flux region of a drive magnet for an actuator of the camera.