Lens Drive Layout for Large Lenses and Sensor Noise Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera modules face challenges in miniaturizing voice coil motor (VCM) technology for subminiature, low-power applications, particularly in mounting large-diameter lenses while ensuring stable power supply and noise reduction for position sensors.
Innovation Solution
A lens moving apparatus with a housing, bobbin, coil, magnets, circuit board, position sensor, and capacitors, where capacitors are strategically placed to enhance power supply stability and noise elimination, and an escape groove in the cover minimizes heat loss during soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large-diameter lens is mounted in the camera module, then the lens aperture and image quality are improved, but the overall size of the camera module increases
Solution Approach 1:
The patent repositions the capacitor from the lateral surface to the corner portion of the housing, utilizing the third dimension (depth/thickness) of the housing structure. This allows the capacitor to be accommodated within the existing footprint without increasing the lateral dimensions of the camera module, thereby supporting larger lens diameters without proportionally increasing overall size.
Solution Approach 2:
The capacitor is nested within the corner portion of the housing structure, which itself is nested within the overall camera module assembly. This nested arrangement allows efficient space utilization, enabling the accommodation of additional components (required for large-diameter lens support) within the existing structural envelope without increasing external dimensions.
2Area of stationary object
If the position sensor is placed close to the circuit board for compact design, then the device size is reduced, but noise interference from the circuit board increases
Solution Approach 1:
The capacitor is extracted and positioned in the corner portion of the housing, separate from the main circuit board area. This spatial separation allows the position sensor to be placed close to the circuit board for compact design while the capacitor, acting as a noise filter, is positioned to effectively suppress noise without being in direct contact with the position sensor, thus reducing noise interference.
Solution Approach 2:
The capacitor serves as an intermediary component between the circuit board and the position sensor. By positioning the capacitor in the corner portion, it acts as a noise filtering intermediary that protects the position sensor from electromagnetic noise generated by the circuit board, enabling close proximity placement while maintaining signal integrity.
3Device complexity
If conventional capacitor placement is used in the camera module, then the structure is simple, but power supply stability to the position sensor is insufficient
Solution Approach 1:
The capacitor is specifically positioned in the corner portion of the housing, a location that provides optimal electrical characteristics for power supply stability. This localized placement strategy improves power supply stability to the position sensor by positioning the capacitor where it can most effectively filter noise and stabilize voltage, without requiring complex structural modifications throughout the entire device.
4Reliability
If the cover is sealed tightly to protect internal components, then protection is improved, but heat dissipation during soldering process is reduced
Solution Approach 1:
The escape groove is pre-formed in the cover structure before the soldering process. This preliminary structural feature allows heat to escape during the soldering operation, preventing heat accumulation that would otherwise damage internal components. After soldering, the cover can be sealed to provide protection, thus achieving both heat dissipation during manufacturing and component protection during operation.
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
Enables the mounting of large-diameter lenses without size increase, provides stable power to position sensors, and effectively eliminates noise, facilitating easier evaluation of autofocus characteristics.
Implementation Method 1
a first capacitor, which is disposed on a first corner portion of the housing disposed between the third side portion and the second side portion of the housing and is conductively connected to the circuit board
Implementation Method 2
a position sensor, which is disposed on the third side portion of the housing and is conductively connected to the circuit board
Data Source
AI summary
One embodiment comprises: a housing; a bobbin arranged in the housing; a coil arranged in the bobbin; a first magnet arranged at a first lateral part of the housing; a second magnet arranged at a second lateral part of the housing facing the first lateral part of the housing; a circuit board arranged at a third lateral part of the housing; a location sensor which is arranged at the third lateral part of the housing and which is electrically connected with the circuit board; and a first capacitor arranged at a first corner part of the housing, which is arranged between the third lateral part of the housing and the second lateral part of the housing, and electrically connected with the circuit board.