Focusing Drive Using Magnetic Coupling to Eliminate Linkage Noise

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Solution Overview

Problem

Existing focusing drives in surgical microscopes are noisy due to high rotation speeds and complex designs, requiring additional linkage elements and maintenance, which complicates assembly and increases noise levels.

Innovation Solution

A focusing drive with a direct drive mechanism and linear guidance system, eliminating the need for additional linkage elements and noise insulation, using a piston directly connected to the linear stroke carriage and mounted on a rail system, which is maintenance-free and reduces noise significantly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If additional linkage elements are used to convert rotary motion to linear motion, then the focusing drive can be driven by standard motors, but the device complexity and assembly difficulty increase

Engineering Contradiction:

Improvemotor selection flexibilityVSAvoidlinkage structure complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical linkage system (gears, belts, spindles) with a magnetic coupling system. The drive shaft of the motor directly couples to the piston through magnetic fields, eliminating the need for intermediate mechanical transmission elements. This substitution resolves the contradiction by maintaining motor flexibility while dramatically simplifying the mechanical structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If traditional linkage elements are used, then standard motors can be employed, but noise levels increase due to high rotation speeds

Engineering Contradiction:

Improvemotor availabilityVSAvoidnoise output

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent eliminates mechanical linkage elements that generate noise through gear meshing, belt friction, and spindle rotation. By using magnetic coupling to directly transmit force from the motor to the piston, the system operates silently while maintaining the ability to use standard DC or stepping motors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If complex linkage elements are used, then motion conversion is achieved, but maintenance requirements increase over product life

Engineering Contradiction:

Improvemotion conversion capabilityVSAvoidservicing frequency

Core Design Contradiction:

Ease of manufactureVSEase of repair

Solution Approach 1:

The patent replaces all mechanical linkage elements requiring lubrication, alignment, and adjustment with a magnetic coupling system. The contactless magnetic transmission eliminates wear and friction, removing the need for greasing, realigning, or readjusting components throughout the product's working life.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Object-generated harmful factors

If noise insulation measures are applied, then noise levels are reduced, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvenoise outputVSAvoidnoise insulation structure

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent eliminates the need for noise insulation measures by replacing the noisy mechanical linkage system with a silent magnetic coupling system. The drive shaft directly couples to the piston through magnetic fields, generating no mechanical noise that would require insulation, thereby avoiding additional complexity and cost.

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 results in a compact, low-noise focusing drive with reduced assembly complexity and no need for lubrication or realignment, providing a stable and space-saving design that minimizes noise and maintenance requirements.

Implementation Method 1

a direct drive (linear drive) for moving a piston supported movably in the focusing direction

Methodology Applied

Scientific EffectLinear drive: Linear Motor

Implementation Method 2

at least one linear guidance system that comprises a rail extending in the focusing direction and at least one carriage movably supported on the rail

Methodology Applied

Scientific EffectLinear guidance: Friction

Data Source

PatentUS7525744B2Focusing drive

Publication Date: 2009.04.28 LEICA INSTRUMENTS (SINGAPORE) PTE LTD

AI summary

The invention relates to a focusing drive (15) having a linear stroke carriage (6) for carrying and moving an optics carrier in the direction of focus, the focusing drive (15) comprising: a focus carrier (1) having at least one linear guidance system (3) having a rail (4) extending in the direction of focus and having at least one carriage (5) movably supported on the rail (4); and a direct drive (2) for moving a piston (10) supported movably in the direction of focus, which piston is in turn joined to the linear stroke carriage (6) of the focusing drive (15), the linear stroke carriage (6) being joined to the at least one carriage (5) of the linear guidance system (3). This focusing drive (15) makes do with few components without linkage elements, and is significantly quieter.