Lens Support Mechanism for Camera Module Impact Resistance

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Solution Overview

Problem

Existing small-sized camera lens driving devices with magnetic components face issues of lens support separation and potential damage due to external forces, leading to uneven movement and risk of dents or cracks in the ball-hitting areas.

Innovation Solution

A lens driving device with a support mechanism featuring a support portion and guiding portion that extend orthogonally to the optical axis, ensuring contact at multiple points to maintain smooth movement and reduce impact, combined with magnetic components for attraction forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If balls are used to support the lens support for free movement, then the lens support can move freely in directions orthogonal to the optical axis, but the lens support may separate from the balls under external force and cause dents or cracks in the ball hitting parts

Engineering Contradiction:
Improvefree movement of lens supportVSAvoiddamage resistance of ball hitting parts
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The patent replaces the ball-based mechanical support system with a magnetic field-based support system. Magnets are embedded in the lens support and magnetic members are provided in the frame member, creating a non-contact magnetic attraction force that eliminates mechanical contact points. This substitution resolves the contradiction by maintaining free movement capability while eliminating the vulnerability of ball hitting parts to impact damage.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary between the lens support and frame member. Instead of direct mechanical contact through balls, the magnetic field acts as a mediator that provides continuous attractive force to maintain positioning. This intermediary approach allows free movement while preventing separation under external forces, as the magnetic attraction continuously acts to keep the lens support aligned with the magnetic members.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Device complexity

If point contact is used between balls and frame member, then the structure is simple, but the impact force concentrates on small areas causing dents or cracks

Engineering Contradiction:
Improvesupport mechanism structureVSAvoidimpact concentration on frame member
Core Design Contradiction:
Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent eliminates the mechanical ball contact system entirely and replaces it with a magnetic field-based support system. This substitution removes the point contact concentration issue by using distributed magnetic fields instead of localized ball contact points. The magnetic attraction force is distributed across multiple magnetic members in the frame, preventing impact concentration while maintaining structural simplicity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental parameter of contact from mechanical point contact to non-contact magnetic field interaction. By changing the support mechanism from physical balls to magnetic fields, the patent eliminates the harmful concentration of impact forces on small areas. The magnetic field distribution across multiple members disperses the force application, preventing dents or cracks while keeping the overall structure simple.

Inventive Principle:
Principle #35Parameter changes

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 ensures smooth and stable movement of the lens support, minimizing the risk of damage from external forces and maintaining optimal functionality.

Implementation Method 1

An attraction force generated between the magnet and the magnetic member causes the balls to be sandwiched between the lens support and the frame member.

Methodology Applied
Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS10955642B2Lens driving device, camera device, and electronic apparatus
Publication Date: 2021.03.23 NEW SHICOH MOTOR CO LTD
  • US10955642B2 patent drawing
  • US10955642B2 patent drawing
  • US10955642B2 patent drawing

AI summary

A lens driving device (12) includes a lens support (20) configured to support a lens, a frame member (22) surrounding a periphery of the lens support (20), and a support mechanism (38) configured to support the lens support (20) so as to be freely movable relative to the frame member (22) in a direction orthogonal to an optical axis direction of the lens. The support mechanism (38) includes a support portion (44, 48) and a guiding portion (46, 50). The support portion (44, 48) and the guiding portion (46, 50) extend in the direction orthogonal to the optical axis direction of the lens, and the support portion (44, 48) is in contact with the guiding portion (46, 50) at least at two points in a cross section in the optical axis direction of the lens.