Subminiature Optical System with Five-Lens Narrow View Angle

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Solution Overview

Problem

Existing portable devices face challenges in achieving a balance between miniaturization, optical performance, and the ability to capture both wide-angle and zoomed-in images effectively.

Innovation Solution

A subminiature optical system utilizing five lenses, specifically designed to have a compact shape with a narrow view angle of 35 degrees or less, while maintaining high resolution and allowing for clear imaging of subjects at long distances.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If the number of lenses is decreased to achieve miniaturization, then the size and weight of the optical system are reduced, but the design freedom and optical performance are compromised

Engineering Contradiction:
Improveweight of optical systemVSAvoiddesign freedom
Core Design Contradiction:
Weight of moving objectVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by carefully controlling the refractive indices, Abbe numbers, and curvature radii of each lens surface. Specifically, it defines relationships such as 1.50 < nd2 < 1.70 for the second lens and 20 < Vd2 < 40 for its Abbe number, while establishing mathematical relationships between curvature radii (e.g., -5.0 < r1/r2 < -2.0). These parameter optimizations enable a five-lens design to achieve both miniaturization and high optical performance.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If a wide-angle optical system is used to capture wider backgrounds, then the view angle is increased, but the ability to image distant subjects clearly is reduced

Engineering Contradiction:
Improveview angleVSAvoidimaging clarity of distant objects
Core Design Contradiction:
Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by creating different optical zones within the system. The first three lenses (with positive, negative, and positive refractive powers respectively) are optimized for wide-angle light gathering, while the fourth and fifth lenses (both with negative refractive power) are specifically designed to correct aberrations and focus distant subjects. This zonal optimization allows the system to simultaneously achieve a narrow view angle (35 degrees or less) and high imaging clarity.

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 system achieves a compact and lightweight design with high definition resolution, enabling clear imaging of subjects at long distances and accommodating both wide-angle and zoomed-in capabilities.

Implementation Method 1

a first lens convex toward the object side and having positive refractive power

Methodology Applied
Scientific EffectRefraction: Refraction

Implementation Method 2

a second lens concave toward an image side and having negative refractive power

Methodology Applied
Scientific EffectRefraction: Refraction

Implementation Method 3

a third lens convex toward the object side and having positive refractive power

Methodology Applied
Scientific EffectRefraction: Refraction

Implementation Method 4

a fourth lens concave toward the image plane and having negative refractive power

Methodology Applied
Scientific EffectRefraction: Refraction

Implementation Method 5

a fifth lens convex toward the image plane and having negative or positive refractive power

Methodology Applied
Scientific EffectRefraction: Refraction

Data Source

PatentUS20250147285A1Subminiature optical system and portable device including the same
Publication Date: 2025.05.08 SAMSUNG ELECTRO MECHANICS CO LTD
  • US20250147285A1 patent drawing
  • US20250147285A1 patent drawing
  • US20250147285A1 patent drawing

AI summary

There are provided a subminiature optical system having a miniature size and capable of obtaining a narrow view angle using only five sheets of lenses, and a portable device having the same. The subminiature optical system includes a first lens convex toward the object side and having positive refractive power, a second lens concave toward an image side and having negative refractive power, a third lens convex toward the object side and having positive refractive power, a fourth lens concave toward the image plane and having negative refractive power, and a fifth lens convex toward the image plane and having negative or positive refractive power, sequentially from an object side.