Dual Lens Camera Module With Magnetic Zoom and Low Friction
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Solution Overview
Problem
Existing camera modules face issues such as friction torque generation, lens decentering and tilt, limited light intake, magnetic field interference, and high power consumption during zooming and image stabilization, particularly in ultra-thin and ultra-small designs for vehicles and mobile devices.
Innovation Solution
A camera module design featuring separate guide parts for lens assemblies with yokes and coils, including side protruding portions to enhance magnetic flux concentration and minimize friction, and a shaper unit for image stabilization with tunable prisms, reducing friction torque and magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom actuator is used for zooming function, then zooming capability is achieved, but friction torque is generated causing decrease in driving force and increase in power consumption
Solution Approach 1:
The patent replaces the traditional mechanical zoom actuator with a magnetic field-based driving system. Coils generate magnetic fields to move lens groups along the optical axis, eliminating mechanical contact and friction torque. This substitution resolves the contradiction by achieving zooming capability without the energy loss associated with mechanical friction.
Solution Approach 2:
The patent employs a magnetic fluid (ferrofluid) as a non-contact coupling medium between the magnetic driving system and the lens groups. The magnetic fluid transmits force through magnetic attraction without physical contact, enabling frictionless operation while maintaining effective force transmission for zooming movements.
2Loss of energy
If separation distance is increased to reduce friction torque, then friction resistance decreases, but lens decentering and tilt are deepened during zoom movement
Solution Approach 1:
By replacing mechanical contact-based driving with magnetic field-based driving, the patent eliminates the need for physical contact surfaces that cause friction. The magnetic force acts at a distance through the magnetic fluid, allowing lens movement without increasing separation distance, thereby maintaining alignment precision while avoiding friction torque.
Solution Approach 2:
The magnetic fluid serves as an intermediary that transmits magnetic force from the coils to the lens groups without requiring direct mechanical contact. This intermediary enables force transmission across a small gap while maintaining precise lens positioning and preventing decentering and tilt during zoom movements.
3Manufacturing precision
If multiple lens groups are used to achieve best optical characteristics, then optical performance is improved, but alignment between lens groups becomes more difficult and decentering occurs
Solution Approach 1:
The magnetic field-based driving system provides precise and uniform force distribution to multiple lens groups simultaneously. This eliminates mechanical errors and alignment deviations that occur with traditional mechanical actuators, making it easier to maintain precise alignment between multiple lens groups and achieve optimal optical characteristics.
Solution Approach 2:
The patent uses independently controllable coils for each lens group, allowing precise control of movement parameters (position, speed, acceleration) for each lens group. This independent parameter control enables sophisticated coordination of multiple lens groups during zoom operations, maintaining alignment and optical performance despite the increased complexity.
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 improves image quality and resolution by minimizing friction and magnetic interference, ensures sufficient light intake, and reduces power consumption, while maintaining precise alignment of lens groups for optimal optical performance.
Implementation Method 1
a third driving part including a first coil part and a third yoke, and a fourth driving part including a second coil part and a fourth yoke
Implementation Method 2
side protruding portions to enhance magnetic flux concentration
Implementation Method 3
a first ball disposed between the first guide part and the first lens assembly, and a second ball disposed between the second guide part and the second lens assembly
Data Source
AI summary
A camera module including a base, and a first lens assembly and a second lens assembly disposed in the base and configured to move in an optical axis direction, a first yoke disposed on the first lens assembly, a second yoke on the second lens assembly, a first magnet on the first yoke, a second magnet disposed on the second yoke, a first coil in the base and opposite to the first magnet, and a second coil disposed in the base and opposite to the second magnet. The first lens assembly includes a first lens barrel and a first driving part housing extended from the first lens barrel in the optical axis direction. The first yoke is on the first driving part housing and extended along the optical axis direction. At least one first portion of the first yoke is overlapped by the first magnet in the optical axis direction.