Imaging Lens Shutter Space Optimization
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Solution Overview
Problem
Existing imaging lenses with a three-lens configuration face challenges in size reduction and maintaining high aberration performance while accommodating a mechanical shutter mechanism, as the shutter mechanism's arrangement is hindered by the need for a small and compact design with a telecentric property.
Innovation Solution
A three-lens imaging lens configuration with specific refractive power distributions and shapes, including a biconvex first lens, a concave second lens with negative power, and a meniscus-shaped third lens, optimized to ensure a sufficient internal interval for the shutter mechanism while maintaining high aberration performance, using conditional expressions to define the lens parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical aperture diaphragm is arranged as closely as possible to the object side to ensure telecentric property, then the telecentric property is improved, but the available space for arranging the shutter mechanism is reduced
Solution Approach 1:
The patent introduces a fourth lens in the optical system, transitioning from a three-lens to a four-lens configuration. This additional lens element provides extra optical freedom to adjust the beam path and create sufficient space for the shutter mechanism while preserving the telecentric property through optimized optical path design.
Solution Approach 2:
The patent modifies the refractive power distribution among the lenses, specifically setting the fourth lens with a positive refractive power and optimizing the focal lengths and positions of all lenses. By changing these optical parameters, the system achieves both telecentricity and adequate space for the shutter mechanism.
2Volume of moving object
If the interval between the first lens and the second lens is increased to accommodate the shutter mechanism, then the available space for shutter mechanism is improved, but the aberration performance deteriorates
Solution Approach 1:
The patent divides the optical system into four distinct lens elements with specific refractive power assignments. The first lens has positive refractive power, the second lens has negative refractive power, and the third and fourth lenses have positive refractive power. This segmentation allows the interval between lenses to be optimized for shutter mechanism placement while each lens contributes to correcting aberrations.
Solution Approach 2:
The patent employs a composite optical system with lenses of different refractive powers and materials. The specific combination of positive and negative refractive power lenses works together to correct aberrations while maintaining the increased interval needed for the shutter mechanism.
3Length of moving object
If the total length of the lens system is reduced for size reduction, then the compactness is improved, but the available space for internal components is reduced
Solution Approach 1:
The patent arranges the four lenses and shutter mechanism in a compact nested configuration where the shutter mechanism is positioned within the optical path between the lenses. The lenses are arranged to minimize total length while creating an internal cavity space for the shutter mechanism, achieving compact integration of multiple components.
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 configuration achieves a small-sized, high-performance lens system that effectively accommodates the shutter mechanism and maintains high aberration performance compatible with increased pixel numbers, optimizing refractive powers and shapes to ensure telecentricity and correct chromatic aberrations.
Implementation Method 1
The first lens has a biconvex shape in a vicinity of an optical axis. The second lens has a concave surface facing a object side. The second lens has a negative refractive power. The third lens has a positive or negative refractive power and has a meniscus shape containing, in a vicinity of the optical axis, a convex surface facing the object side.
Data Source
AI summary
An imaging lens includes first to third lenses G1 to G3 arranged in order from a object side. The first lens has a biconvex shape in a vicinity of an optical axis Z1. The second lens has a concave surface facing a object side. The second lens has a negative refractive power. The third lens has a positive or negative refractive power and has a meniscus shape containing, in a vicinity of the optical axis, a convex surface facing the object side. The following conditional expression is satisfied:0.7<f1/f<1.30.2≦D2/f<0.5where f denotes a focal length of the entire system of the imaging lens, f1 denotes a focal length of the first lens G1 and D2 denotes an interval on the optical axis Z1 between the first lens G1 and the second lens G2.