Variable Magnification Lens Group Vibration Reduction

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Solution Overview

Problem

Existing variable magnification optical systems with vibration reduction lens groups face challenges in improving optical performance and reducing the size of the vibration reduction lens group.

Innovation Solution

A variable magnification optical system comprising multiple lens groups, including a first negative lens group for vibration reduction, a second negative lens group for focusing, and a third negative lens group, with specific conditional expressions to optimize focal lengths and movements for improved optical performance and compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vibration reduction lens group is added to improve optical performance and reduce image blur, then the optical performance is improved, but the device complexity and size increase

Engineering Contradiction:

Improveoptical performanceVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the vibration reduction function with the existing lens groups by making the first negative lens group movable in a direction perpendicular to the optical axis. This merging approach integrates the vibration reduction capability into the existing optical structure without adding a separate dedicated vibration reduction mechanism, thereby improving optical performance while minimizing increases in device complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The first negative lens group serves dual purposes: it contributes to the overall optical power of the system and simultaneously functions as the vibration reduction lens group when made movable perpendicular to the optical axis. This multi-functionality allows a single component to address both imaging and vibration compensation needs, reducing the need for additional dedicated parts

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a vibration reduction lens group is added to reduce image blur, then the optical performance is improved, but the size of the lens group increases

Engineering Contradiction:

Improveoptical performanceVSAvoidsize of vibration reduction lens group

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The vibration reduction function is merged with the first negative lens group, eliminating the need for a separate dedicated vibration reduction lens group. By utilizing the existing lens group's structure and making it movable perpendicular to the optical axis, the patent achieves vibration reduction without increasing the overall size of the optical system

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The first negative lens group performs multiple functions including contributing to optical power and serving as the vibration reduction element. This multi-functionality allows the same component to address both imaging requirements and vibration compensation, avoiding the need for additional size-increasing dedicated vibration reduction components

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 system achieves enhanced optical performance by correcting various aberrations and reducing image blur caused by camera shake, while also ensuring a compact vibration reduction lens group and efficient focusing mechanism.

Implementation Method 1

the first negative lens group being movable to include a component in a direction perpendicular to the optical axis as a vibration reduction lens group

Methodology Applied

Scientific EffectVibration reduction:

Implementation Method 2

the second negative lens group being moved along the optical axis upon carrying out focusing

Methodology Applied

Scientific EffectFocusing: Focusing

Implementation Method 3

a plurality of lens groups which include a first negative lens group having negative refractive power, a second negative lens group disposed at a more image side than the first negative lens group and having negative refractive power, and a third negative lens group disposed at a more image side than the second negative lens group and having negative refractive power

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250044562A1Variable magnification optical system, optical equipment, and method for producing variable magnification optical system

Publication Date: 2025.02.06 NIKON CORP

AI summary

A variable magnification optical system comprising a plurality of lens groups which includes a first negative lens group having negative refractive power, a second negative lens group disposed at a more image side than the first negative lens group and having negative refractive power, a third negative lens group disposed at a more image side than the second negative lens group and having negative refractive power; upon varying a magnification, distances between adjacent lens groups being varied; the first negative lens group being movable to include a component in a direction perpendicular to the optical axis as a vibration reduction lens group; the second negative lens group being moved along the optical axis upon carrying out focusing; and the predetermined conditional expression(s) being satisfied. The variable magnification optical system can attain a high optical performance and be made in small in size.