Six-Lens Mobile Camera Optics for Wide FOV and Low F-Number
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Solution Overview
Problem
The challenge is to achieve a camera module with a small F-number, a large field of view, and high relative illumination while being implemented in a small size, which is hindered by the narrow space in mobile terminals.
Innovation Solution
An optical system comprising a sequence of lenses with specific refractive powers and tilt angles, including a first lens with positive power, a second lens with negative power, and a sixth lens with negative power, along with critical points and tilt angles optimized for light collection and dispersion, minimizing the system's size while maintaining high illumination and wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera device is miniaturized to fit narrow mobile terminal space, then the device size is reduced, but the amount of light reaching the image sensor decreases and the F-number increases
Solution Approach 1:
The patent applies parameter changes by optimizing the F-number to 2.1 or less and designing specific lens curvature radii and thicknesses. The sixth lens has an object-side surface curvature radius R6S1 and image-side surface curvature radius R6S2 with specific relationships to the fifth lens parameters, enabling compact size while maintaining adequate light transmission
Solution Approach 2:
The patent introduces tilt angles as an additional design dimension. The object-side surface of the sixth lens and image-side surface of the fifth lens are designed with tilt angles ranging from 35 to 45 degrees relative to the optical axis, allowing light from wide angles to reach the sensor effectively in a compact configuration
2Illumination intensity
If the F-number is reduced to increase light transmission, then the brightness improves, but the system size increases
Solution Approach 1:
The patent achieves F-number of 2.1 or less through specific parameter optimization including lens curvature radii (R5S1, R5S2, R6S1, R6S2), thicknesses (CT5, CT6), and spacing between lenses. These parameters are designed to maximize light transmission while minimizing the optical path length and overall system volume
Solution Approach 2:
By introducing tilted lens surfaces with angles of 35 to 45 degrees, the patent enables a compact optical path that achieves high brightness without increasing system size. The tilt allows light rays to be redirected efficiently within a smaller volume
3Area of moving object
If the field of view is increased to capture more scene, then the coverage area improves, but the optical system complexity increases
Solution Approach 1:
The patent achieves a field of view of 90 degrees or more through optimized lens parameters including the curvature radii and thicknesses of the five-lens system. The specific relationships between R5S1, R5S2, R6S1, and R6S2 enable wide-angle light capture without requiring additional optical elements
Solution Approach 2:
The introduction of tilted lens surfaces provides an additional degree of freedom for controlling light paths. The tilt angles of 35 to 45 degrees enable wide field of view by redirecting oblique light rays onto the sensor while maintaining a simple five-lens configuration
4Illumination intensity
If the relative illumination is increased to improve peripheral light distribution, then the uniformity improves, but the optical design complexity increases
Solution Approach 1:
The patent achieves relative illumination of 19% or more through optimized lens parameters including curvature radii and thicknesses. The specific design of the fifth and sixth lenses with their curvature relationships ensures adequate light distribution to peripheral regions while maintaining a simple optical structure
Solution Approach 2:
The tilted surfaces of the fifth and sixth lenses provide an effective mechanism for improving relative illumination. The tilt angles redirect light rays that would otherwise miss the sensor, improving peripheral illumination uniformity without adding complex optical elements
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 device with an F-number of 2.1 or less, a field of view of 90 degrees or more, and a relative illumination of 19% or more, providing a bright image with minimized external size.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are sequentially disposed from an object side to an image side, wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power
Data Source
AI summary
An optical system according to an embodiment of the present invention comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged from an object side to an image side, wherein the first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power. The object-side surface of the sixth lens is concave toward the object side; the image-side surface of the fifth lens is convex toward the image side; the object-side surface of the fifth lens and the image-side surface of the sixth lens include a critical point at which the tilt angle is 0, and the object-side surface of the sixth lens has the largest tilt angle in the range of 0.8 to 1.2 times the vertical distance from the optical axis to the critical point of the image-side surface of the sixth lens.