Image Sensing Module Vibration Correction via Coil-Magnet Actuation

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Solution Overview

Problem

Existing image sensing modules fail to effectively correct vague images caused by camera vibrations without reducing ambient brightness or increasing the camera's volume, as they either move lenses or require large piezoelectric members.

Innovation Solution

An image sensing module with a movable frame and support base, utilizing a combination of coils, magnets, and Hall members to adjust the image sensing unit's position relative to the optical axis, allowing for vibration correction without affecting lens positioning or increasing camera size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lens is moved perpendicular to the optical axis to correct vague images, then the vague image caused by vibration is corrected, but the ambient brightness and MTF value are reduced, deteriorating optical imaging

Engineering Contradiction:

Improveimage correction capabilityVSAvoidambient brightness

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

Instead of moving the lens perpendicular to the optical axis to correct vibration, this patent inverts the approach by moving the image sensing unit in the same direction as the vibration. This allows image stabilization while keeping the lens stationary, thereby maintaining ambient brightness and optical imaging quality

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If a piezoelectric member is used to move the image sensing unit, then the vague image is corrected, but the piezoelectric member requires continuous electric power and increases the volume of the camera

Engineering Contradiction:

Improveimage correction capabilityVSAvoidcamera volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

This patent replaces the piezoelectric member (mechanical system requiring continuous power) with a coil-magnet assembly that utilizes electromagnetic force. The coil is energized only when vibration detection indicates correction is needed, reducing power consumption and allowing for a more compact design

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Instead of continuous operation, the coil-magnet system operates periodically based on vibration detection signals. The coil is energized only when vibration correction is required, reducing continuous power consumption and enabling a smaller overall system volume

Inventive Principle:

Principle #19Periodic action

3Reliability

If a larger piezoelectric member is used to move the heavier CCD, then the image correction is effective, but the volume of the camera increases

Engineering Contradiction:

Improveimage correction effectivenessVSAvoidcamera volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent replaces the piezoelectric member with a coil-magnet assembly that generates electromagnetic force to move the image sensing unit. This substitution allows for effective movement of the heavier CCD without requiring a large piezoelectric member, thus maintaining compact camera volume

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 effectively corrects vague images due to camera vibrations without reducing ambient brightness or increasing the camera's size, maintaining optical imaging quality while minimizing the module's volume.

Implementation Method 1

When the first coil is energized by a voltage, a magnetic force is generated by the first coil and first magnet, moving the movable frame through the first guiding mechanism and along the first direction

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

The first Hall member is disposed on the support base and beside the first coil

Methodology Applied

Scientific EffectHall effect: Hall Effect

Data Source

PatentUS7577346B2Image sensing module

Publication Date: 2009.08.18 ASIA OPTICAL INT LTD

AI summary

An image sensing module. A movable frame is disposed in and moves with respect to a fixed base. A support base is disposed in the movable frame and moves with respect to the fixed base. An image sensing unit is fixed to the support base. A first guiding mechanism combines the movable frame with the fixed base and moves with respect to the fixed base along a first direction, moving the support base with respect to the fixed base along the first direction. A first coil is disposed on the support base. A first magnet is disposed on the fixed base and opposes the first coil. A first Hall member is disposed on the support base and beside the first coil. When the first coil is energized by a voltage, a magnetic force is generated by the first coil and first magnet, moving the movable frame along the first direction.