Camera Lens Actuator Structure for Compact Focus and Handshake Correction
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Solution Overview
Problem
Existing camera modules face challenges in achieving miniaturization, low power consumption, and accurate focusing while effectively correcting handshake vibrations, especially in ultracompact designs for portable devices.
Innovation Solution
A lens driving apparatus that includes a bobbin with a coil and magnet configuration, supported by elastic members and sensors for precise displacement detection, allowing for compact design, power efficiency, and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional VCM technology is used in camera modules, then focusing function is achieved, but power consumption increases and miniaturization becomes difficult
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional VCM structure. Specifically, it removes the separate sensor magnet and sensor substrate, integrating the sensor function directly into the housing. This extraction of redundant elements reduces both power consumption and device complexity, enabling miniaturization while maintaining focusing functionality.
Solution Approach 2:
The housing is designed to serve multiple functions simultaneously: it acts as both the structural support and the mounting substrate for the sensor. The first magnet is integrated into the housing structure, eliminating the need for separate magnet mounting components. This multi-functionality reduces the number of parts and enables miniaturization without compromising the focusing function.
2Reliability
If handshake correction is implemented by moving the optical system in the plane perpendicular to the optical axis, then image correction is achieved, but device complexity increases and miniaturization becomes unsuitable
Solution Approach 1:
The patent merges the handshake correction function with the existing focusing structure. The same bobbin and magnetic field interaction mechanism used for focusing is utilized for handshake correction. By combining these functions into a single integrated structure rather than using separate mechanisms, the patent reduces device complexity while maintaining reliability for both focusing and handshake correction operations.
3Measurement precision
If multiple separate components are used for sensor mounting and support, then detection accuracy is maintained, but the number of parts increases and housing weight increases
Solution Approach 1:
The sensor substrate function is merged with the housing structure. The housing directly provides the mounting surface and structural support for the sensor, eliminating the need for separate sensor substrates and mounting components. This integration maintains detection accuracy while reducing the number of parts and housing weight.
Solution Approach 2:
The housing is designed to perform multiple functions: structural support, sensor mounting substrate, and magnetic field interaction component. By making the housing multi-functional, the patent eliminates the need for separate dedicated components for each function, thereby reducing the total number of parts and housing weight while maintaining measurement precision.
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 accurate detection of bobbin displacement without tilting, reduces the number of parts and housing weight, achieves miniaturization and low power consumption, and enhances reliability through conductive elastic member connections.
Implementation Method 1
a first sensor for detecting displacement of the bobbin in a first direction, a second magnet disposed to face the first sensor
Implementation Method 2
a second sensor for detecting displacement of the housing with respect to the base in the second and third directions
Implementation Method 3
a first coil being disposed at an outer circumferential surface of the bobbin, a first magnet disposed near the bobbin so as to face the first coil
Implementation Method 4
a second coil disposed so as to face the first magnet
Data Source
AI summary
A lens driving device according to an embodiment comprises: a bobbin wherein at least one lens is installed inside thereof and a first coil is installed on the outer circumferential surface thereof; a first magnet arranged around the bobbin so as to be opposite to the first coil; a housing for supporting the first magnet; upper and lower elastic members coupled with the bobbin and the housing; a first sensor for sensing displacement of the bobbin in the first direction; a second magnet arranged so as to be opposite to the first sensor; a base arranged to be spaced apart from the housing by a certain distance; a second coil arranged so as to be opposite to the first magnet; a circuit board whereon the second coil is installed; a plurality of support members for supporting the housing so as to be movable in the second and third directions which are orthogonal to the first direction with respect to the base and for connecting at least one of the upper and lower elastic members to the circuit board; and a second sensor for sensing displacement of the housing in the second or third direction with respect to the base.