Cemented Lens Diameter Ratio for Cylindrical Barrel
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Solution Overview
Problem
The challenge is to develop a low-cost, high-performance optical system for image pickup apparatuses like in-vehicle cameras, which requires a simpler lens barrel structure to reduce processing costs while maintaining optical performance, particularly in wide-angle and telephoto lenses where the outer diameter of lenses varies significantly.
Innovation Solution
The optical system incorporates a diaphragm and a first cemented lens with a negative lens, where the ratio of the outer diameter to the effective diameter of the negative lens is between 1.5 and 15.0, allowing for a cylindrical lens barrel design that is easier to manufacture and process, while maintaining aberration correction through the arrangement of positive and negative lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens barrel with a complicated stepped structure is used to hold lenses with varying outer diameters, then the lens can be held securely, but the processing cost increases and manufacturing becomes more difficult
Solution Approach 1:
The patent applies parameter changes by specifying a particular ratio range between the outer diameter and effective diameter of the negative lens (1.05 < D1/D0 ≤ 2.0). This parameter optimization allows the lens to be held securely in a simpler cylindrical lens barrel structure, resolving the contradiction between secure lens holding and ease of manufacturing.
2Device complexity
If the outer diameter of the negative lens is reduced, then the lens barrel structure can be simplified, but the aberration correction performance deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the ratio parameter between outer diameter and effective diameter of the negative lens. By maintaining the ratio within the specific range (1.05 < D1/D0 ≤ 2.0), the design achieves both simplified lens barrel structure and adequate aberration correction performance.
Solution Approach 2:
The patent uses a cemented lens structure combining a negative lens and a positive lens. This composite lens design allows the negative lens to have an optimized diameter ratio for simplified manufacturing while the combined lens system maintains proper aberration correction through the interaction of positive and negative optical powers.
3Ease of manufacture
If the ratio of outer diameter to effective diameter of the negative lens is made small, then the lens barrel can be simpler and cheaper, but the aberration correction capability is compromised
Solution Approach 1:
The patent directly addresses this contradiction by establishing an optimal parameter range for the diameter ratio (1.05 < D1/D0 ≤ 2.0). This parameter optimization enables the use of simpler, cheaper cylindrical lens barrels while maintaining sufficient aberration correction capability through the balanced design of the cemented lens system.
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
This configuration enables the production of a cost-effective optical system with improved aberration correction and reduced complexity in lens barrel design, facilitating the use of low-cost cylindrical lens barrels without compromising performance.
Implementation Method 1
a first cemented lens disposed adjacent to an object side of the diaphragm. The first cemented lens included a negative lens
Data Source
AI summary
An optical system includes a diaphragm, and a first cemented lens disposed adjacent to an object side of the diaphragm. The first cemented lens included a negative lens. A predetermined condition is satisfied.