Magnetic Rolling Drive Optical Unit for Springless Shake Correction

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Solution Overview

Problem

Existing optical units with shake correction functions for portable terminals or movement bodies rely on mechanical springs to return the movable body to a home position, which are difficult to structure and handle, complicating assembly and operation.

Innovation Solution

An optical unit with a shake correction function that uses a magnetic rolling drive mechanism, including a rolling drive magnet and a magnetic sensor, to control the power feeding to the rolling drive coil based on the magnetic sensor's output, allowing the movable body to return to a home position around an axial line without a spring member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mechanical spring is used to return the movable body to home position, then the shake correction function is achieved, but the device complexity and difficulty of assembly increase due to the need for thin curved arm parts

Engineering Contradiction:

Improveshake correction functionVSAvoidspring structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical spring-based return mechanism with a magnetic field-based positioning system. A magnet is embedded in the movable body and interacts with a coil in the fixed body to generate magnetic force that returns the movable body to the home position, eliminating the need for complex mechanical springs and curved arm parts.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and interaction mechanism from mechanical elastic deformation (springs) to electromagnetic interaction (magnet and coil). By controlling the electrical current to the coil, the magnetic force can be precisely adjusted to achieve the return motion, simplifying the mechanical structure.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a mechanical spring with thin curved arm parts is used, then the return to home position is achieved, but the ease of manufacture and handling deteriorates

Engineering Contradiction:

Improvehome position returnVSAvoidspring assembly difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If a magnetic rolling drive mechanism with magnet and coil is used, then the ease of manufacture and assembly is improved, but the device requires additional control systems

Engineering Contradiction:

Improveassembly simplicityVSAvoidcontrol system requirements

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent incorporates a sensor that detects the position of the movable body and provides feedback to the control system. Based on this feedback, the control system adjusts the current to the coil to generate appropriate magnetic force, ensuring the movable body returns to and maintains the home position accurately despite the added control complexity.

Inventive Principle:

Principle #23Feedback

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 optical unit effectively corrects shake without the need for mechanical springs, simplifying assembly and operation by using magnetic sensors and coils to precisely control the position of the optical module, ensuring accurate shake correction and reducing the risk of mechanical failure.

Implementation Method 1

a magnetic sensor which are fixed to the other of the movable body and the fixed body so as to face the rolling drive magnet

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Implementation Method 2

power feeding to the rolling drive coil is controlled based on an output from the magnetic sensor

Methodology Applied

Scientific EffectElectromagnetic interaction: Electromagnetic Induction

Data Source

PatentUS10599009B2Optical unit with shake correction function and having a rolling drive mechanism

Publication Date: 2020.03.24 SANKYO SEIKI MFG CO LTD

AI summary

An optical unit with a shake correction function may include a movable body having an optical module, a swing support mechanism, and a holder; a fixed body which turnably holds the movable body around the axial line; a magnetic swing drive mechanism structured to swing the optical module; and a magnetic rolling drive mechanism structured to turn the movable body around the axial line. The magnetic rolling drive mechanism may include a rolling drive magnet which is fixed to the fixed body and a rolling drive coil and a magnetic sensor which are fixed to the movable body so as to face the rolling drive magnet. Power feeding to the rolling drive coil may be controlled based on an output from the magnetic sensor so as to set the movable body at a home position around the axial line.