Five-Element Lens Assembly for Compact Telephoto Imaging

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional optical lens assemblies struggle to balance image quality, sensitivity, aperture size, volume, and field of view, particularly in compact electronic devices with high-end specifications and telephoto features, failing to meet the demands of modern imaging systems.

Innovation Solution

An imaging system lens assembly comprising five lens elements with specific optical properties, including convex and concave surfaces, aspheric shapes, and a reflective element, designed to satisfy conditions such as 2.5<BL/TD<10.0 and 1.0<Fno<3.8, enhancing image quality and compactness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional optical lens assembly is used, then image quality and sensitivity can be maintained, but aperture size and field of view cannot be optimized simultaneously

Engineering Contradiction:

Improveaperture sizeVSAvoidfield of view

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

The lens assembly is divided into five distinct lens elements (first lens element, second lens element, third lens element, fourth lens element, and fifth lens element) with different refractive powers and surface characteristics. This segmentation allows each lens element to be optimized for specific optical functions, enabling simultaneous optimization of aperture size and field of view that cannot be achieved with a single conventional lens assembly.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If telephoto lens assembly is used, then optical zoom ratio can be increased, but total track length becomes excessive and aperture stop becomes small

Engineering Contradiction:

Improveoptical zoom ratioVSAvoidtotal track length

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent introduces a reflective element that folds the optical path at an angle, transitioning from a linear optical arrangement to a multi-dimensional folded structure. This allows the optical system to achieve telephoto functionality with a compact total track length by utilizing spatial folding rather than extending the optical path linearly.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The reflective element is integrated within the lens assembly structure, nesting the optical folding mechanism within the existing lens element arrangement. This nested configuration allows the folded optical path to be contained within a compact volume, achieving telephoto ratio without excessive external dimensions.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Ease of manufacture

If conventional lens assembly is used, then manufacturing is simpler, but image quality and compactness cannot be balanced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidimage quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Different lens elements are assigned specific local optical characteristics: the first lens element has positive refractive power with a convex object-side surface, the second lens element has negative refractive power, the third lens element has positive refractive power with a concave image-side surface, the fourth lens element has negative refractive power, and the fifth lens element has positive refractive power. This local quality differentiation allows each element to be manufactured with optimized parameters for its specific function, achieving high image quality while maintaining manufacturability through standardized optical design principles.

Inventive Principle:

Principle #3Local quality

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 lens assembly achieves improved image quality, compact size, and telephoto functionality while balancing illuminance and depth of field, suitable for telephoto applications with a flexible space arrangement.

Implementation Method 1

an imaging system lens assembly includes five lens elements, the five lens elements are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS12443014B2Imaging system lens assembly, imaging apparatus and electronic device

Publication Date: 2025.10.14 LARGAN PRECISION

AI summary

An imaging system lens assembly includes five lens elements, the five lens elements are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each of the five lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof.