Camera Lens Group With Dual Prisms For Compact Telephoto Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera lens designs for portable electronic devices, such as smartphones, face challenges in achieving ultra-thin and miniaturized telephoto lenses with high optical zoom capabilities while maintaining good image quality and a wide field-of-view.
Innovation Solution
A camera lens group comprising five lenses and two prisms, strategically arranged with specific refractive powers, surface shapes, and spacings along the optical axis, including aspheric surfaces, to optimize field-of-view, image quality, and miniaturization, with prisms aiding in light convergence and reducing the overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional coaxial design is used for telephoto lens assembly, then the focal length can be extended, but the overall length of the camera lens group increases significantly
Solution Approach 1:
The patent introduces a non-coaxial optical path design where the optical axis changes direction between lens groups. The first lens group has its optical axis extended along the optical axis direction, while the second lens group's optical axis is extended in a direction different from the optical axis. This dimensional change allows achieving long focal length equivalent to conventional coaxial designs while maintaining a compact overall length suitable for ultra-thin portable devices.
2Length of moving object
If the camera lens group is miniaturized to achieve ultra-thin characteristics, then the field-of-view is reduced
Solution Approach 1:
By changing the optical path from conventional coaxial to non-coaxial arrangement, the patent achieves a compact lens group structure with reduced thickness while maintaining a wide field-of-view of 80° or more. The non-coaxial optical axes of the first and second lens groups allow for better space utilization and light convergence, enabling both miniaturization and wide-angle performance.
Solution Approach 2:
The patent optimizes specific parameter ranges including the ratio of effective focal lengths (1.2 < f1/f2 < 3.0), the ratio of maximum effective radii (0.7 < DT1/DT2 < 1.3), and the distance relationships between lens groups to achieve both ultra-thin profile and wide field-of-view. These parameter optimizations ensure good image quality while maintaining compact dimensions.
3Length of stationary object
If the focal length is extended to achieve telephoto capability, then the device thickness increases
Solution Approach 1:
The patent achieves telephoto capability with focal length ratio f1/f2 between 1.2 and 3.0 without increasing device thickness by using non-coaxial optical paths. The first lens group positioned closer to the object with optical axis extended along the optical axis, and the second lens group with optical axis extended in a different direction, creates a compact telephoto structure that maintains ultra-thin device profile.
4Adaptability or versatility
If a compact lens assembly is designed for wide-angle, then the telephoto zoom capability is limited
Solution Approach 1:
The patent simultaneously achieves wide-angle capability (FOV ≥ 80°) and telephoto zoom capability (f1/f2 between 1.2 and 3.0) through non-coaxial optical path design. The first lens group with positive or negative refractive power and the second lens group with positive refractive power are arranged with their optical axes in different directions, allowing the compact assembly to provide both wide-field and telephoto functions.
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 solution enables a camera lens group with a maximum field-of-view of ≥80°, improved image quality, and miniaturization, effectively addressing the limitations of conventional designs by enhancing light convergence and reducing the lens assembly's length.
Implementation Method 1
a first prism having a first reflecting surface, and an angle between the first reflecting surface and the optical axis being 45°
Implementation Method 2
a second prism having a second reflecting surface, and an angle between the second reflecting surface and the optical axis being 45°
Implementation Method 3
a first lens having refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; and a fifth lens having refractive power
Data Source
AI summary
The present disclosure discloses a camera lens group including, sequentially from an object side to an image side along an optical axis, a first lens having refractive power; a first prism having a first reflecting surface, and an angle between the first reflecting surface and the optical axis being 45°; a stop; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; a second prism having a second reflecting surface, and an angle between the second reflecting surface and the optical axis being 45°; and a fifth lens having refractive power. A maximum field-of-view FOV of the camera lens group satisfies: FOV≥80.0°.