Variable Aperture Magnetic Retention for Stable Blade Position
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Solution Overview
Problem
In related technologies, lens modules with variable apertures experience abnormal noise due to uncontrolled movement of aperture blades during power failures, caused by the inability of the driving mechanism to maintain blade position.
Innovation Solution
A variable aperture design incorporating a fixed seat, movable seat, driving mechanism, blade group, and retention assembly with magnetic members that magnetically connect the movable seat to the fixed seat, ensuring the blade group remains fixed even without power, using a reset assembly to restore mobility when powered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving mechanism is used to control aperture blade convergence or dispersion, then the light inlet size can be adjusted, but during power failure the blades cannot be fixed and abnormal noise occurs
Solution Approach 1:
The retention assembly applies a preliminary fixing force to the blade group through magnetic attraction between the first magnetic member on the fixed seat and the second magnetic member on the movable seat. This preliminary anti-action prevents the blades from moving freely during power failure, counteracting the harmful effect of uncontrolled blade movement before it can cause abnormal noise.
2Reliability
If the driving mechanism continuously controls the blade group to maintain position, then blade position stability is improved, but power consumption increases
Solution Approach 1:
The retention assembly enables the blade group to self-fix during power failure through passive magnetic attraction between the first magnetic member and second magnetic member, without requiring continuous power supply from the driving mechanism. The magnetic force automatically engages when power is lost, and the reset assembly repositions the blades when power is restored, eliminating the need for continuous energy consumption to maintain blade position.
3Reliability
If the retention assembly magnetically connects the movable seat to the fixed seat, then the blade group is fixed during power failure, but the structure becomes more complex
Solution Approach 1:
The retention assembly replaces complex mechanical locking mechanisms with a simpler magnetic field-based system. The first magnetic member and second magnetic member create an automatic magnetic connection between the fixed seat and movable seat during power failure, eliminating the need for additional mechanical locks, springs, or complex actuating mechanisms while achieving reliable blade group fixation.
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
Reduces abnormal noise and power consumption by maintaining blade position stability during power outages and enabling power-saving operation by fixing the blade group without continuous energy supply.
Implementation Method 1
a first magnetic member and a second magnetic member, one of the first magnetic member and the second magnetic member being provided at the fixed seat, and the other of the two being provided at the movable seat, the first magnetic member and the second magnetic member being configured to magnetically connect the movable seat along the optical axis direction to the fixed seat
Implementation Method 2
the reset assembly comprises an electromagnetic coil and a third magnetic member, the electromagnetic coil is provided at the fixed seat, the third magnetic member is provided at the movable seat, and the electromagnetic coil is configured to generate a magnetic field when energized so that the third magnetic member responds to the acting force of the magnetic field to take the movable seat to reset relative to the fixed seat along the optical axis direction
Data Source
AI summary
A variable aperture, a lens module and an electronic device are provided. The variable aperture includes a fixed seat, a movable seat, a driving mechanism, a blade group and a retention assembly. The fixed seat has a mounting space and is provided with a limiting portion along the optical axis direction. The movable seat, driving mechanism and blade group are located in the mounting space, the blade group can rotate around the optical axis following the movable seat to adjust size of light inlet. The variable aperture allows movable seat to be attracted to the fixed seat by the magnetic attraction force possessed by the retention assembly, and the blade group rests against the limiting portion of the fixed seat. When the variable aperture is not electrified, movement of the blade group can be restricted, thereby and blade group cannot move freely under external forces.