Optical Unit Shake Correction via Gimbal and Magnetic Drive

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Solution Overview

Problem

Existing optical units with shake correction functions fail to ensure that the movable body rotates around a rotation axis that coincides with the optical axis, leading to ineffective shake correction when the optical module rotates around the first or second axis.

Innovation Solution

The optical unit incorporates a rotation support structure with a gimbal mechanism and magnetic drive structures, where the plate holder is made of magnetic material and magnetically attracted to the plate roll, allowing smooth rotation and ensuring the movable body rotates around the optical axis even when rotating around the first or second axis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the rotation support structure supports the movable body rotatably around a predetermined axis when the optical module is not rotating around the first axis or the second axis, then the optical axis coincides with the rotation axis of the movable body, but when the optical module is rotating around the first axis or the second axis, the rotation axis of the movable body does not coincide with the optical axis of the optical module

Engineering Contradiction:

Improvecoincidence of optical axis and rotation axisVSAvoidrotation capability around multiple axes

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The rotation support structure is divided into multiple independent rotational stages: the gimbal structure enables rotation around the first axis (pitch) and second axis (yaw), while the rotation support structure enables independent rotation around the optical axis (roll). This segmentation allows each rotational degree of freedom to be controlled separately, ensuring the optical axis remains the rotation axis even when rotating around other axes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the rotational state of the movable body through magnetic drive structures. The rolling magnetic drive structure rotates the movable body around the optical axis based on the rotational state around the first and second axes, ensuring that the effective rotation axis always coincides with the optical axis regardless of the gimbal's rotational position.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If a rolling magnetic drive structure is driven to rotate the movable body while the optical module is rotating around the first axis or the second axis, then the movable body rotates, but the optical module does not rotate around the optical axis

Engineering Contradiction:

Improverotation controlVSAvoidshake correction effectiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system uses acceleration sensors to detect the rotational state around the first and second axes, and based on this feedback, the rolling magnetic drive structure adjusts the rotation around the optical axis to compensate for the misalignment, ensuring the optical module always rotates around the optical axis for effective shake correction.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The rotation support structure acts as an intermediary between the gimbal structure and the optical module. It receives rotational input from the gimbal and adds compensatory rotation around the optical axis, mediating the combined motion to ensure the final rotation is always around the optical axis.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures that the movable body rotates around the optical axis, effectively correcting shake and maintaining image stability during movement.

Implementation Method 1

the shake-correction magnet and the rolling-correction magnet may be arranged in a circumferential direction around the optical axis... the plate holder may be made of a magnetic material and may be disposed on a side opposite to the shake-correction magnet and the rolling-correction magnet with respect to the plate roll

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Implementation Method 2

the rotation structure may include a plurality of spherical objects that roll in contact with the plate roll and the facing portion

Methodology Applied

Scientific EffectRolling: Roller

Data Source

PatentUS11460714B2Optical unit with shake correction function

Publication Date: 2022.10.04 SANKYO SEIKI MFG CO LTD

AI summary

In an optical unit with a shake correction function, a rotation support structure, which supports a movable body rotatably around an optical axis, may be supported by a gimbal structure rotatably around a first axis and a second axis intersecting with the optical axis so that, even when the movable body is rotating around the first axis or the second axis, the rotation axis of the movable body by the rotation support structure coincides with the optical axis of the movable body.