Five-Lens Camera Module Narrow Angle Design

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Solution Overview

Problem

Existing camera lenses with five small lenses struggle to achieve narrow view angles while maintaining excellent optical properties, due to insufficient refractive power distribution and lens shape, particularly in the first and fourth lenses, leading to wide angles greater than 64.0 or 75.8 degrees.

Innovation Solution

A camera lens design comprising five lenses with specific refractive powers and shapes, including a glass plate between the fifth lens and the image surface, with optimized curvature radii and axial distances, to achieve narrow angles and miniaturization with improved optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the camera lens uses five small lenses with conventional refractive power distribution and lens shapes, then the lens structure is compact, but the view angle becomes wide (2ω≥64.0° or 2ω≥75.8°) instead of narrow

Engineering Contradiction:

Improvelens sizeVSAvoidview angle

Core Design Contradiction:

Volume of moving objectVSShape

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive power distribution among the five lenses and adjusting the curvature radii of specific lens surfaces. The key parameters modified include the ratio of focal lengths (f1/f), the axial distance ratio (d6/f), and the shape parameters ((R1+R2)/(R1-R2) and (R7+R8)/(R7-R8)). These parameter adjustments enable the lens to achieve a narrow view angle (2ω<50°) while maintaining a compact structure.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the refractive power distribution and lens shapes are not optimized, then the manufacturing is simpler, but the optical properties are insufficient leading to wide view angles

Engineering Contradiction:

Improvelens fabricationVSAvoidoptical property precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent establishes specific parameter ranges that balance manufacturability with optical precision. By defining concrete ranges for focal length ratios, axial distances, and surface curvatures, the patent provides manufacturing guidelines that achieve narrow view angles without requiring excessive manufacturing complexity. The aspherical surface parameters are also optimized within practical manufacturing limits.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the first and fourth lens shapes are not sufficiently optimized, then the design is simpler, but the view angle remains wide (2ω≥64.0°)

Engineering Contradiction:

Improvelens design complexityVSAvoidview angle

Core Design Contradiction:

Device complexityVSShape

Solution Approach 1:

The patent applies local quality by specifically optimizing the shapes of the first and fourth lenses, which have the most significant impact on view angle control. The curvature radii of these lenses are precisely controlled within specific ranges, while other lenses maintain relatively simpler designs. This selective optimization achieves narrow view angles without uniformly increasing the complexity of all lens elements.

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 design achieves a narrow angle of 47.8 degrees with excellent optical properties, including corrected aberrations, lateral color, and distortion, while maintaining a small size, as demonstrated in the provided embodiments.