Lens Driving Module Assembly for Stable Optical Axis Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional camera modules face issues with optical axis position changes due to adhesive mounting, conductive member coupling defects, and vibration-induced resolution deterioration, particularly in miniaturized and high-pixelated camera modules for mobile devices.
Innovation Solution
The lens driving device design includes fitting the sensor and sensing magnet surfaces to a housing, optimizing conductive line formation, and securing pad positions to enhance assembly precision and reduce vibration impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to mount the sensor and sensing magnet in the manufacturing process, then assembly is simplified, but optical axis position changes occur leading to manufacturing precision deterioration
Solution Approach 1:
The housing is divided into an upper housing and a lower housing that are coupled together. The sensor is mounted on the upper housing while the sensing magnet is mounted on the lower housing. This segmentation allows each component to be positioned and fixed independently, eliminating the need for adhesive and preventing optical axis position changes that would occur with adhesive mounting.
Solution Approach 2:
The coupling structure between the upper and lower housings serves as an intermediary mechanism that precisely positions the sensor and sensing magnet relative to each other. This mechanical coupling structure provides stable positioning without requiring adhesive, thereby maintaining optical axis position consistency while simplifying assembly.
2Reliability
If conventional coupling methods are used for conductive members, then electrical connection is achieved, but peaks and workability deteriorate
Solution Approach 1:
The conductive member coupling structure merges the electrical connection function with the mechanical positioning function. The coupling structure simultaneously provides both electrical conductivity and mechanical support, improving workability by eliminating the need for separate adhesive bonding steps while maintaining reliable electrical connection for the driving part and sensor.
3Force
If VCM actuator is used in conventional camera modules, then driving force is sufficient, but device size increases and power consumption increases
Solution Approach 1:
The patent transitions from a conventional VCM (Voice Coil Motor) actuator to a linear vibration motor actuator. This dimensional change in actuator type allows for more efficient use of space and power while maintaining sufficient driving force for lens movement, thereby enabling camera module miniaturization and reduced power consumption.
4Volume of moving object
If linear vibration motor is used to reduce size, then camera module is miniaturized, but vibration affects optical axis and resolution deteriorates
Solution Approach 1:
The patent extracts the vibration source (linear vibration motor) from the optical path and positions it separately from the lens and sensor assembly. By separating the vibration-generating actuator from the optical components, the design maintains miniaturization benefits while reducing vibration-induced optical axis instability and resolution deterioration.
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
Maintains consistent optical axis positioning, improves workability and reliability, and reduces vibration-induced resolution deterioration in camera modules.
Implementation Method 1
a sensor detecting a position of a sensing magnet along an optical axis direction
Implementation Method 2
a driving coil disposed at an outside of the sensing magnet in a radial direction of the optical axis, and a driving magnet disposed at the housing, facing the driving coil
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present embodiments relates to a lens driving device comprising: a housing; a bobbin disposed in the housing; a coil disposed on the bobbin; a first magnet which is disposed on the housing and faces the coil; a second magnet disposed on the bobbin; and a sensor which is disposed on the housing and faces the second sensor, wherein the sensor comprises an upper surface, a lower surface disposed opposite the upper surface, an inner surface facing the second magnet, an outer surface disposed opposite the inner surface, and both lateral surfaces connecting the inner surface with the outer surface, the upper surface and the lower surface of the sensor are fixed to the housing , and one of the side surfaces of the sensor is opened.