Seven-Lens Optical Imaging Group for Ultra-Short Total Length
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Solution Overview
Problem
The challenge is to design an optical imaging lens group that achieves ultra-large imaging plane and high image quality while maintaining an ultra-short total length, which is essential for modern portable electronic devices like smartphones and tablets.
Innovation Solution
The optical imaging lens group consists of seven lenses with specific refractive powers, surface shapes, and center thicknesses, along with carefully configured spaced intervals, to achieve the desired characteristics. This configuration includes a combination of positive and negative refractive powers, convex and concave surfaces, and aspheric surfaces to minimize aberrations and ensure efficient light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve large imaging plane and high image quality, then the imaging performance is improved, but the total length of the optical system increases
Solution Approach 1:
The patent employs a nested arrangement where the seventh lens is positioned within the sixth lens structure, and earlier lenses are arranged in compact configurations. This nesting allows multiple lens elements to occupy overlapping or closely integrated spatial volumes, achieving a seven-lens system with ultra-short total length while maintaining large imaging plane capability
Solution Approach 2:
The patent transitions from traditional linear sequential lens arrangements to a multi-dimensional compact configuration. By utilizing radial and axial spatial dimensions more efficiently, the lens group achieves ultra-large imaging plane (ImgH≥7.5mm) while compressing the optical path length through sophisticated three-dimensional lens positioning and spacing optimization
2Area of stationary object
If the focal length is increased to achieve large imaging plane, then the imaging plane size is improved, but the total length of the optical system increases
Solution Approach 1:
The patent employs dynamic optical design where the seventh lens has variable optical power that can be adjusted through its specific curvature configuration (R13 and R14). This dynamic capability allows the system to achieve ultra-large imaging plane (ImgH≥7.5mm) while maintaining ultra-short total length by optimizing the focal length distribution across all seven lenses, with the seventh lens contributing −1.0mm≤f7≤−0.5mm to the overall focal length
Solution Approach 2:
The patent systematically optimizes multiple parameters including the focal length of each lens (f1 through f7), radius of curvature of all surfaces (R1 through R14), and center thickness of each lens (CT1 through CT7). By changing these parameters within specific ranges and satisfying multiple conditional equations, the system achieves the breakthrough of large imaging plane with short total length
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 effectively achieves a large imaging plane with high image quality and a short optical total length, enhancing the performance of portable electronic devices by optimizing refractive power distribution and surface shapes, thereby improving image quality and reducing the device's size.
Implementation Method 1
an optical imaging lens group includes, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which have refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens group including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens having reactive power. The first lens has positive refractive power, a convex object-side surface, and a concave image-side surface. A total effective focal length f of the optical imaging lens group and half of a maximal field-of-view Semi-FOV of the optical imaging lens group satisfy: f*tan(Semi-FOV)>7.5 mm. A distance TTL along the optical axis from the object-side surface of the first lens to an imaging plane of the optical imaging lens group and half of a diagonal length ImgH of an effective pixel area on the imaging plane of the optical imaging lens group satisfy: TTL/ImgH<1.3.