Six-Lens Wide-Angle Optical Assembly with Cemented Elements
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Solution Overview
Problem
Miniaturization of lens assemblies for digital still cameras is challenging due to increased lens count and sensitivity to high temperature and high humidity environments, which reduces their lifespan.
Innovation Solution
A wide-angle lens design utilizing a combination of spherical and aspheric glass lenses with negative refractive power, arranged in a specific sequence, and cemented lenses to achieve miniaturization, high temperature resistance, and extended lifespan, while maintaining a large field of view and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more lenses are installed and pixel number is increased to generate higher resolution images, then image quality is improved, but lens assembly volume increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines multiple lens functions into a compact six-lens assembly where the fourth and fifth lenses are cemented together to form a cemented lens. This merging approach maintains high resolution capabilities while significantly reducing the overall lens assembly volume, enabling miniaturization for portable digital still cameras.
Solution Approach 2:
The lens assembly employs a nested arrangement where the sixth lens is positioned closest to the image sensor, with subsequent lenses arranged in sequence toward the object side. The cemented lens structure (fourth and fifth lenses) creates a compact nested configuration that maximizes optical performance within minimal space.
2Adaptability or versatility
If lens assembly is used in high temperature and high humidity environment, then adaptability is improved, but lifespan is greatly reduced
Solution Approach 1:
The patent employs composite material construction where the fourth and fifth lenses are cemented together using optical cement to form a sealed cemented lens unit. This composite structure provides environmental sealing that protects against high temperature and high humidity, maintaining lens performance and extending lifespan in harsh conditions.
Solution Approach 2:
The cemented lens configuration creates an inert, sealed environment between the fourth and fifth lenses, isolating the internal optical surfaces from external environmental factors such as moisture and temperature fluctuations. This protective configuration prevents degradation and maintains longevity in challenging environments.
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 provides a compact wide-angle lens with a 150-degree field of view, F-number of 3.0, and effective aberration correction, ensuring good optical performance and extended lifespan even in harsh environments.
Implementation Method 1
The first lens is with negative refractive power and includes a convex surface facing the object side. The second lens includes a convex surface facing the object side. The third lens is a biconvex lens. The fourth lens is a biconvex lens. The fifth lens is a biconcave lens. The sixth lens is a biconvex lens.
Implementation Method 2
The fourth lens and the fifth lens are cemented together to form a cemented lens.
Data Source
AI summary
A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power and includes a convex surface facing the object side. The second lens includes a convex surface facing the object side. The third lens is a biconvex lens. The fourth lens is a biconvex lens. The fifth lens is a biconcave lens. The sixth lens is a biconvex lens. The fourth lens and the fifth lens are cemented together to form a cemented lens.