Shake Correction Apparatus Coil Magnet Arrangement
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Solution Overview
Problem
Conventional shake correction apparatuses for cameras are bulky due to the arrangement of three driving portions outside the lens, making it difficult to reduce the camera size.
Innovation Solution
A shake correction apparatus with a stationary portion having multiple coil pairs, where each coil pair has different driving forces, and a movable portion with magnets arranged to face the coils, allowing for size reduction by optimizing the arrangement of coils and magnets to minimize the apparatus' size while maintaining effective shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three driving portions are arranged outside the effective diameter of the lens, then shake correction function is achieved, but the apparatus size increases along the plane orthogonal to the optical axis
Solution Approach 1:
The patent merges the driving portions with the lens structure by arranging coils and magnets such that the driving portions are located within the effective diameter of the lens. Specifically, coils are arranged on a stationary portion and magnets on a movable portion that can be positioned within the lens effective diameter, combining the drive mechanism with the optical assembly rather than placing them separately outside the lens.
Solution Approach 2:
The patent transitions from a planar arrangement of driving portions outside the lens to a three-dimensional configuration where coils and magnets are arranged in opposing faces across the optical axis. This dimensional reorganization allows the driving portions to be compact and fit within the lens effective diameter while maintaining the shake correction function.
2Area of stationary object
If coils and magnets are arranged to minimize apparatus size, then compact design is achieved, but driving force distribution must be optimized
Solution Approach 1:
The patent applies local quality by making the coils and magnets have different driving forces intentionally. Specifically, the coils are designed with different numbers of turns or different magnetic path lengths to create unequal driving forces, which allows optimization of the compact arrangement while maintaining control over the movable portion's movement characteristics.
Solution Approach 2:
The patent employs asymmetry in the coil and magnet configuration, where the coils are arranged in opposing pairs with asymmetric characteristics (different sizes, different numbers of turns, or different magnetic path lengths). This asymmetric design creates different driving forces in the coil pairs, enabling compact packaging while providing controlled movement characteristics for shake correction.
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
Enables size reduction of the camera shake correction apparatus while maintaining effective shake correction capabilities, allowing for more compact camera designs.
Implementation Method 1
control means for controlling a current to be flowed into the coils based on an output of the detection means
Implementation Method 2
the movable portion is attached to the stationary portion by magnetic forces of the magnets through the supporting member
Data Source
AI summary
A shake correction apparatus includes: a stationary portion (21) having coils (22S, 22L, 23S, 23L, 24S, 24L) arranged; a movable portion including magnets (52a, 52b, 52c, 52d, 53a, 53b, 53c, 53d, 54a, 54b, 54c, 54d) opposed to the coils and an imaging element; a supporting member for movably supporting the movable portion to the stationary portion along a plane orthogonal to an optical axis of light entering into the imaging element; means for detecting a position of the movable portion; and means for controlling current flowed into the coils based on output of the detection means, the coils including at least three coil pairs when two coils opposed to each other along the plane orthogonal to the optical axis are paired, driving forces of two coils forming each coil pair being different.