Electromagnetic Adjustable Diaphragm for Low-Burden Autofocus
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Solution Overview
Problem
Existing adjustable diaphragms in camera modules increase the counterweight of the lens, affecting focusing driving and require complex electrical wiring that interferes with focusing movements.
Innovation Solution
An adjustable diaphragm design featuring a light-shielding blade, blade supporting ring, blade driving ring, and an electromagnetic driving assembly using Lorentz force to rotate the blades, separating the diaphragm part from the lens and reducing the counterweight burden on autofocus mechanisms, with electrical wiring arranged peripherally to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the adjustable diaphragm is arranged on the lens, then the aperture can be adjusted to control light entering the optical system, but the object side counterweight of the lens is increased, causing the lens to tilt and affecting focusing driving
Solution Approach 1:
The adjustable diaphragm is divided into two independent parts: a diaphragm body fixed to the lens and a driving assembly separated from the lens. The driving assembly includes a driving magnet fixed to the lens and a driving coil movable relative to the lens, allowing the diaphragm to be adjusted without increasing the counterweight on the lens.
Solution Approach 2:
The driving assembly is extracted from the lens structure and positioned separately. The driving coil is movable relative to the lens and can be disposed at any position, allowing the diaphragm adjustment function to be separated from the lens counterweight, thus avoiding the tilting problem.
2Adaptability or versatility
If the adjustable diaphragm is arranged on the lens, then aperture adjustment is achieved, but electrical wiring needs to be arranged inside to drive the diaphragm, and it is necessary to ensure that the electrical wiring does not affect focusing, which makes design difficult
Solution Approach 1:
The driving assembly is extracted from the lens structure and positioned separately. The driving coil is movable relative to the lens and can be disposed at any position, allowing the diaphragm adjustment function to be separated from the lens counterweight, thus avoiding the tilting problem.
Solution Approach 2:
The driving coil is positioned in a different spatial dimension relative to the lens, allowing electrical wiring to be arranged in the peripheral space without interfering with the lens focusing mechanism. This dimensional separation provides routing space for wires that does not constrain the lens movement.
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 optimizes the counterweight of the camera module, reduces the burden on autofocus mechanisms, and allows for independent electrical wiring without affecting focusing movements, enhancing the camera's shooting performance.
Implementation Method 1
the driving magnet drives, when the driving coil is energized, the driving coil to drive the driving rod to rotate
Data Source
AI summary
An adjustable diaphragm is disclosed. At least one light-shielding blade is movably fixed through cooperation of a blade supporting ring and a blade driving ring, an electromagnetic driving assembly drives, by using Lorentz force between driving magnet and a driving coil, a driving rod to rotate relative to a base, and the driving rod is slidably connected to the blade driving ring, to drive the blade driving ring to rotate, thereby driving, by using the blade driving ring, the light-shielding blade to rotate to block or expose a lens of a camera module. In this way, a diaphragm part and the electromagnetic driving assembly are separated from the lens, a counterweight of the camera module can be optimized, and a burden on an autofocus mechanism is reduced. In the present disclosure, a camera module and an electronic device are further disclosed.