Camera Module Lens Holder Anti-Warp Design
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Solution Overview
Problem
Miniaturized and low power-consuming camera modules face challenges in applying conventional VCM techniques, particularly in preventing warp of the optical axis and maintaining high performance.
Innovation Solution
A camera module design featuring a PCB with an image sensor, a base, first and second lens holders, and an actuator for focus adjustment, with an electronic circuit pattern layer and adhesive coating for active alignment, preventing foreign objects and enhancing bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional VCM techniques are applied to miniaturized camera modules, then focus adjustment capability is achieved, but optical axis warp occurs and performance deteriorates
Solution Approach 1:
The lens holder is divided into a first lens holder and a second lens holder that form an outer cover. This segmentation allows independent optimization of each component's function and alignment, preventing optical axis warp while maintaining focus adjustment capability through the actuator.
Solution Approach 2:
The second lens holder acts as an intermediary component that forms an outer cover of the first lens holder. This intermediary structure provides a stable reference frame for optical alignment while allowing the actuator to adjust the lens position for focus control, thus resolving the conflict between alignment precision and operational flexibility.
2Volume of moving object
If camera module size is reduced for miniaturization, then compactness is achieved, but applying conventional focus adjustment techniques becomes difficult
Solution Approach 1:
The first lens holder is nested within the second lens holder that forms its outer cover. This nested structure maximizes space utilization in the miniaturized camera module, allowing the actuator and lens assembly to be compactly arranged while maintaining full focus adjustment functionality through the concentric actuator design.
Solution Approach 2:
The actuator is arranged concentrically with the optical axis of the lens module, utilizing radial space rather than linear extension. This dimensional arrangement allows focus adjustment mechanisms to be integrated within the compact lens holder volume without compromising operational capability.
3Strength
If adhesive coating is applied for bonding lens holders, then bonding strength is enhanced, but foreign objects may contaminate the image sensor
Solution Approach 1:
The adhesive coating process is extracted and performed in a controlled manner after the lens holders are assembled. By separating the bonding operation from the assembly operation, the patent ensures that adhesive application does not introduce foreign objects to the image sensor while maintaining strong bonding between 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 design simplifies the lens holder structure, maintains high performance, and secures active alignment for optical performance and productivity, preventing optical axis warp and ensuring effective miniaturization.
Implementation Method 1
the second lens holder is secured by an adhesive coated on a surface contacting the base at a predetermined height
Implementation Method 2
a driving source is installed and a plurality of lenses is moved to change a relative distance for adjustment of an optical focal length
Implementation Method 3
an image sensor or a photoelectric conversion device of a CCD (Charge Coupled Apparatus) type or a CMOS (Complementary Metal Oxide Semiconductor) type to converge light from an object to a photosensitive element, to form an image of the object
Data Source
AI summary
An exemplary embodiment of the present invention relates to a camera module configured to prevent a warp of an optical axis of a lens holder, the camera module including a PCB (Printed Circuit Board) mounted with an image sensor, a base, a first lens holder arranged at an upper surface of the base and including at least one or more lens modules therein, a second lens holder forming an outer cover of the first lens holder, and an actuator concentrically arranged with an optical axis of the lens module for adjusting a focus of an image captured by the image sensor.