Telescopic Lens Barrel Assembly for Compact Mobile Cameras

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The integration of cameras with photographing functions in mobile terminals occupies a large amount of space, hindering the miniaturization of these devices.

Innovation Solution

A lens assembly with a specific ratio of the outer diameter of the front end surface of the front lens barrel to the outer diameter of the rear lens barrel, along with defined dimensions and angles for the lens barrels, to minimize the overall size while maintaining optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a camera with photographing function is integrated into mobile terminal, then the photographing function is improved, but the occupied space increases

Engineering Contradiction:

Improvephotographing functionVSAvoidoccupied space

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent implements nesting by placing the front lens barrel inside the rear lens barrel, forming a telescopic structure where the front lens barrel can move axially relative to the rear lens barrel. This nested configuration allows both lens barrels to coexist in a compact space, significantly reducing the overall volume occupied by the lens assembly while maintaining the photographing function.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent transitions from a traditional side-by-side or stacked arrangement to a telescopic configuration where the front lens barrel extends axially from the rear lens barrel. This dimensional reorganization allows the lens assembly to maintain a small form factor when retracted while providing extended optical path when needed, effectively reducing occupied space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the lens barrel size is reduced, then the miniaturization is improved, but the optical performance may deteriorate

Engineering Contradiction:

Improvelens barrel sizeVSAvoidoptical performance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent specifies precise parameter ranges for the lens barrel dimensions and their ratios to maintain optical performance while achieving miniaturization. The controlled parameter relationships ensure that the reduced lens barrel size does not compromise the optical path length, aperture, or focal ratio, thereby preserving photographing quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different structural characteristics to different parts of the lens assembly. The front lens barrel has a specific diameter ratio and axial length relationship with the rear lens barrel, while the lens groups within each barrel have optimized configurations. This localized optimization ensures that each component contributes to maintaining optical performance despite the overall size reduction.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4067963B1Lens assembly and mobile terminal

Publication Date: 2025.09.10 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

Figure 1
Figure 2
Figure 3

AI summary

A lens assembly (1) and a mobile terminal (2) are provided. The lens assembly includes a lens barrel, and the lens barrel includes a front lens barrel (10) and a rear lens barrel (20) arranged coaxially. A ratio of an outer diameter of a front end surface (101) of the front lens barrel to an outer diameter of a front end surface (109) of the rear lens barrel is within a predetermined range.