Six-Lens Camera Module with Compact Retracted Height
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Solution Overview
Problem
Camera lenses with a narrow angle and good optical characteristics tend to have a longer total length when retracted, making it challenging to achieve both a low height and optimal optical performance.
Innovation Solution
A six-lens camera lens configuration with specific refractive power and curvature radius ratios, including a first lens with positive refractive power, a second lens with negative refractive power, and subsequent lenses with alternating powers, satisfying relational formulas to optimize the on-axis distance and focal length ratios, ensuring a narrow angle and low height when retracted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera lens uses a six-lens configuration with narrow angle (2ω ≤ 52°) to achieve good optical characteristics, then the optical performance is improved, but the total length when retracted (TTL) becomes longer
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ratio of the on-axis distance between the first and sixth lenses to the total length during shooting (DL/TTL ≤ 0.60), and by optimizing focal length ratios (f1/f2 between -1.00 and -0.80, f1/f between 0.50 and 0.80). These parameter optimizations allow the lens to achieve compact retracted length while maintaining narrow angle and good optical characteristics.
2Reliability
If the on-axis distance ratio DL/TTL is increased to improve optical characteristics, then the optical performance is enhanced, but the retracted height increases
Solution Approach 1:
The patent resolves this contradiction by establishing the specific parameter range DL/TTL ≤ 0.60, which balances the on-axis distance requirement for optical performance with the retracted height constraint. This parameter optimization ensures that the lens achieves both good optical characteristics and compact form factor when retracted.
3Reliability
If the focal length ratio f1/f2 is optimized to improve optical characteristics, then the optical performance is enhanced, but the lens configuration complexity increases
Solution Approach 1:
The patent simplifies the lens configuration by establishing clear parameter ranges for focal length ratios (f1/f2 between -1.00 and -0.80, f1/f between 0.50 and 0.80). These parameter specifications provide design guidance that reduces configuration complexity while maintaining optimal optical characteristics for the six-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
The camera lens achieves a narrow angle of 52° or less with good optical characteristics and a low height of TTL/IH<1.60 when retracted, addressing the challenge of balancing optical performance and compactness.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power, and a sixth lens having a positive refractive power
Data Source
AI summary
The present invention provides a camera lens which is constituted by six lenses and has a narrow angle and good optical characteristics when shooting and a low height when retracted. The camera lens, includes, from an object side, a first lens having a positive refractive power; a second lens a having negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power, and satisfies given relational formulas.