Miniature Telephoto Lens Module with TTL Below EFL

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Solution Overview

Problem

Existing dual-aperture zoom cameras in portable devices face challenges with long dimensions and light-blocking issues due to differing total track lengths (TTLs) of Wide and Tele lenses, and standard optical image stabilization (OIS) is inadequate for compensating tilt in both lenses simultaneously.

Innovation Solution

A miniature telephoto lens module is designed with a telephoto lens assembly and field lens assembly, using multiple polymer materials with different Abbe numbers to reduce chromatic aberrations and fit within portable devices, while maintaining effective focal length (EFL).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If dual-aperture zoom cameras use Wide and Tele imaging sections with different TTLs, then advanced imaging capabilities such as zoom and image quality are achieved, but the dimensions (heights) of the cameras along the optical axis increase and light-blocking issues occur

Engineering Contradiction:

Improveimage qualityVSAvoidcamera dimension along optical axis

Core Design Contradiction:

Measurement precisionVSLength of stationary object

Solution Approach 1:

The patent implements nesting by placing the Wide imaging section inside the Tele imaging section, with the Wide lens assembly positioned within the Tele lens assembly's optical path. This nested configuration allows both imaging sections to share the same optical axis and reduces the overall camera dimension along the optical axis while maintaining different TTLs for Wide and Tele lenses, thereby preventing light-blocking issues between the two sections.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If standard optical image stabilization (OIS) is used in dual-aperture zoom cameras, then tilt compensation is provided, but it is inadequate for compensating tilt in both lenses simultaneously

Engineering Contradiction:

Improvetilt compensationVSAvoidsimultaneous tilt compensation for both lenses

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements multi-functionality by providing separate OIS mechanisms for both the Wide lens assembly and the Tele lens assembly, allowing each lens to receive independent tilt compensation. The Wide OIS mechanism is configured to compensate tilt for the Wide imaging section, while the Tele OIS mechanism compensates tilt for the Tele imaging section, enabling simultaneous and optimized tilt compensation for both lenses rather than using a single standard OIS system.

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 telephoto lens module achieves a compact design with TTL less than EFL, minimizing shadowing and light-blocking, and enables efficient OIS compensation for both lenses, suitable for integration in modern electronic devices.

Implementation Method 1

using multiple polymer materials with different Abbe numbers to reduce chromatic aberrations

Methodology Applied

Scientific EffectChromatic aberration: Dispersion (of waves)

Data Source

PatentUS12405448B2Miniature telephoto lens module and a camera utilizing such a lens module

Publication Date: 2025.09.02 COREPHOTONICS

AI summary

The presently disclosed subject matter includes a mobile electronic comprising an integrated camera, comprising a Wide camera unit comprising a Wide lens unit, and a Telephoto camera unit comprising a telephoto lens unit, the telephoto lens unit and the wide lens unit having respectively TTL/EFL ratios smaller and larger than 1 and defining separate telephoto and wide optical paths.