Multi-lens Frame Optical Axis Alignment for CMOS Sensors

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Solution Overview

Problem

Current video-recording devices with multiple lenses face challenges in achieving accurate image quality due to misalignment of the optical axis with the CMOS active pixel sensor during assembly, leading to compromised imaging performance.

Innovation Solution

An optical image capturing module with a multi-lens frame and fixed-focus lens assemblies is designed, where the optical axis of each lens assembly overlaps the central normal line of the image sensor, ensuring light passes through the lens assembly and is emitted to the sensing surface, with specific conditions for lens parameters such as focal length, entrance pupil diameter, and angle of view to maintain image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple lenses are used to meet higher photographic requirements, then the imaging capability is improved, but the alignment precision between optical axis and CMOS sensor deteriorates

Engineering Contradiction:
Improveimaging capabilityVSAvoidalignment precision
Core Design Contradiction:
Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent merges the lens support structure and optical axis alignment function into a single integrated component. The lens support structure includes a first support surface and a second support surface that are symmetrically configured, with the optical axis passing through the intersection of these surfaces. This integration ensures that multiple lenses are automatically aligned with the CMOS sensor without requiring separate alignment procedures, thus resolving the contradiction between using multiple lenses for improved imaging capability and maintaining precise optical axis alignment.

Inventive Principle:
Principle #5Merging (Combining)

2Ease of manufacture

If the optical axis is not accurately aimed at the CMOS active pixel sensor during assembly, then the manufacturing process is simpler, but the image quality deteriorates

Engineering Contradiction:
Improveassembly simplicityVSAvoidoptical axis alignment
Core Design Contradiction:
Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-configuring the lens support structure with symmetric first and second support surfaces during manufacturing. The optical axis is predetermined to pass through the intersection of these surfaces, establishing the correct alignment before the actual lens assembly process. This preliminary configuration ensures that when lenses are installed, they automatically achieve proper alignment with the CMOS sensor without requiring complex post-assembly adjustments, thus simplifying the manufacturing process while maintaining high optical axis alignment precision.

Inventive Principle:
Principle #10Preliminary action

3Adaptability or versatility

If at least four lenses are included to meet higher photographic requirements, then the functional capability is improved, but the imaging quality control becomes more difficult

Engineering Contradiction:
Improvephotographic capabilityVSAvoidimaging quality control
Core Design Contradiction:
Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies universality by designing a lens support structure that can accommodate multiple lenses (at least four) using a unified symmetric configuration. The first and second support surfaces are designed to be symmetric with respect to the optical axis, creating a universal mounting platform that maintains consistent alignment for all lenses. This universal design allows the same support structure to hold multiple lenses while ensuring each lens maintains proper optical axis alignment with the CMOS sensor, thus improving photographic capability while maintaining imaging quality control.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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

This configuration ensures high image quality by accurately aligning the optical axis with the image sensor, allowing light to be effectively focused, thereby improving the imaging performance of video-recording devices with multiple lenses.

Implementation Method 1

Each of the at least two fixed-focus lens assemblies has at least two lenses with refractive power... an optical axis of each of the at least two fixed-focus lens assemblies overlaps a central normal line of the sensing surface... light is able to pass through the fixed-focus lens assembly... pass through each of the light channels, and be emitted to the sensing surface

Methodology Applied
Scientific EffectRefraction: Refraction

Data Source

PatentUS10816749B2Optical image capturing module and system with multi-lens frame and manufacturing method thereof
Publication Date: 2020.10.27 ABILITY OPTO ELECTRONICS TECH
  • US10816749B2 patent drawing
  • US10816749B2 patent drawing
  • US10816749B2 patent drawing

AI summary

An optical imaging module utilizes conductive lines and electric conductors to reduce the overall thickness of an image sensor element. With the configuration of a fixed lens assembly and a multi-lens frame, incident light passes through the fixed lens assembly and is accurately focused on the image sensor element. Hereby, the image sensor element is thus fully imaged. Besides, the invention can ensure the image quality and prevent the element from deforming during encapsulation and causing the problems such as short circuit, and can reduce the size of the optical image capturing module.