Lens Shield Member for Magnetic Noise Reduction
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Solution Overview
Problem
Interchangeable lenses with image-shake correction units using voice coil motors generate magnetic noise that degrades image quality, and existing solutions do not effectively reduce this noise reaching the image sensor.
Innovation Solution
A lens apparatus with a movable member driven by a coil and a shield member that covers the coil from both sides perpendicular to the optical axis, reducing magnetic noise exposure to the image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image-shake correction unit operates during image sensor charge readout, then image-shake correction functionality is maintained, but magnetic noise from the coil degrades image quality
Solution Approach 1:
A shield member is introduced as an intermediary component between the coil and the image sensor. The shield member includes a first shield portion covering the coil from the image plane side, a second shield portion covering the coil from the other side, and a third shield portion connecting both shield portions, forming a complete magnetic shield that blocks magnetic noise from reaching the image sensor during charge readout.
2Object-affected harmful factors
If the coil is fully covered by the shield member, then magnetic noise reduction is maximized, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The shield member is divided into multiple segments: a first shield portion, a second shield portion, and a third shield portion. Each segment serves a specific function in blocking magnetic noise from different directions, making the overall shielding more effective while allowing for modular manufacturing and assembly.
Solution Approach 2:
The shield member simultaneously performs multiple functions: the first shield portion blocks magnetic noise from the image plane side, the second shield portion blocks magnetic noise from the other side, and the third shield portion connects both portions while also contributing to the overall magnetic shielding. This multi-functional design maximizes noise reduction without requiring separate components for each shielding direction.
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 significantly reduces magnetic noise reaching the image sensor, thereby improving image quality without the need to stop the image-shake correction unit during image sensor charge readout, enhancing continuous image capturing speed.
Implementation Method 1
a coil that is provided on the movable member to drive the movable member in the direction
Implementation Method 2
a shield member that covers at least a portion of the coil viewed in an optical axis direction from an image plane side
Data Source
AI summary
A lens apparatus includes an imaging optical system, a movable member that holds at least one lens and is movable in a direction including component perpendicular to an optical axis of the imaging optical system, a coil, a first magnet, and a shield member that covers at least a portion of the coil viewed in an optical axis direction from an image plane side, covers at least a portion of the coil viewed in a first direction perpendicular to the optical axis from one side of the movable member, and covers at least a portion of the coil viewed in the first direction from the other side of the movable member.