Zoom Lens Image Stabilization Group Segmentation

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Solution Overview

Problem

There is a demand for a zoom lens that offers image stabilization performance while being compact and lightweight, while maintaining favorable optical performance, which existing zoom lenses have not effectively addressed.

Innovation Solution

The zoom lens configuration includes a first lens group with positive refractive power, a second lens group with negative refractive power, an intermediate group with positive refractive power, and a subsequent group with negative refractive power, where the second lens group consists of a stationary front group and a moving image stabilization group, and the intermediate group's focal lengths and distances between lens groups are optimized to satisfy specific conditional expressions for size and weight reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a zoom lens includes image stabilization mechanism with moving lens groups, then image stabilization performance is improved, but device size and weight increase

Engineering Contradiction:

Improveimage stabilization performanceVSAvoidlens weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The second lens group is divided into a front group and an image stabilization group, where only the image stabilization group moves during blur correction while the front group remains stationary. This segmentation reduces the weight of moving parts compared to moving the entire lens group.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic image stabilization by allowing the image stabilization group to move in a direction intersecting the optical axis during blur correction, while other lens groups remain relatively stationary or move only for focusing and zooming operations.

Inventive Principle:

Principle #15Dynamics

2Reliability

If a zoom lens includes multiple lens groups for high zoom ratio, then optical performance is improved, but device complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoidlens structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The zoom lens is divided into four functional groups (first lens group with positive power, second lens group with negative power, intermediate group with positive power, and subsequent group with negative power), where each group has specific movement characteristics during zooming and focusing operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The intermediate group serves multiple functions: it contributes to the zooming operation by changing distances between lens groups, enables focusing by moving along the optical axis, and helps maintain favorable optical performance across different focal lengths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the image stabilization group has strong negative refractive power, then stabilization effectiveness is improved, but lens size increases

Engineering Contradiction:

Improvestabilization effectivenessVSAvoidlens length

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent optimizes the refractive power parameters of the image stabilization group and other lens groups to achieve effective image stabilization while controlling the overall lens length. Specific conditional expressions are satisfied to balance stabilization effectiveness with compact dimensions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The image stabilization group is positioned within the second lens group structure, allowing it to be nested among other optical elements. This nested arrangement enables the stabilization function to be integrated into the existing zoom lens structure without significantly increasing overall size.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

This configuration achieves image stabilization performance, reduces size and weight, and maintains favorable optical performance by controlling refractive powers and movements of lens groups, thereby achieving a high zoom ratio with minimized aberrations.

Implementation Method 1

a first lens group that has a positive refractive power; a second lens group that is disposed subsequent to the first lens group and has a negative refractive power; an intermediate group that includes at least one lens group and has a positive refractive power; and a subsequent group that includes at least one lens group and has a negative refractive power

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20240337822A1Zoom lens and imaging apparatus

Publication Date: 2024.10.10 FUJIFILM CORP

AI summary

The zoom lens includes, in order from a position closest to an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; an intermediate group that has a positive refractive power; and a subsequent group that has a negative refractive power. The first lens group moves during zooming. The second lens group consists of, in order from the object side to the image side, a front group of the second lens group which does not move during image blur correction and an image stabilization group which moves during image blur correction and has a negative refractive power. The zoom lens satisfies predetermined conditional expressions.