Lens Drive Control for Vibration Suppression
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Solution Overview
Problem
Existing portable imaging apparatuses with voice coil motors face challenges in stopping the imaging lens quickly due to sudden external forces applied to elastic springs, leading to vibrations and prolonged stopping times.
Innovation Solution
A movement control portion that gradually changes the current signal from a first position to a second position, allowing the imaging lens to be slowly moved and stopped without applying large external forces, using a current signal producing circuit and current waveform converting circuit or a voltage signal producing circuit with a voltage-current converting circuit, to suppress vibrations and achieve faster stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a voice coil motor is used to move the imaging lens, then the structure can be simplified, but the imaging lens cannot be stopped quickly due to vibrations caused by sudden external forces on elastic springs
Solution Approach 1:
The patent applies dynamics by transitioning from static spring support to dynamic control. A movement control portion is introduced that actively adjusts the current signal to the voice coil motor based on the imaging lens position, enabling dynamic compensation for vibrations and achieving quick stopping without compromising structural simplicity.
Solution Approach 2:
The patent implements feedback control through the movement control portion that receives position information about the imaging lens and adjusts the current signal accordingly. This closed-loop feedback system detects vibrations and applies counteracting forces, allowing the lens to stop quickly while maintaining structural simplicity.
2Device complexity
If elastic springs are used to support the imaging lens, then the structure is simple, but large external forces cause vibrations and prolonged stopping time
Solution Approach 1:
The patent introduces the movement control portion as an intermediary between the voice coil motor and the imaging lens. This intermediary processes position information and modulates the current signal to eliminate harmful vibrations caused by sudden forces on the elastic springs, while maintaining the simplicity of the spring support structure.
Solution Approach 2:
The patent changes the parameter of current signal characteristics through the movement control portion. By adjusting current magnitude and timing based on lens position feedback, the system eliminates vibrations without changing the physical spring support structure, thus maintaining structural simplicity while removing harmful effects.
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 imaging lens can be stopped within a shorter time period than prior art, reducing vibrations and enabling faster in-focus imaging, even when supported by elastic springs.
Implementation Method 1
a coil, placed in the magnetic field, that, upon an input of a current signal, receives a force in an optical axis direction to move the imaging lens to a position corresponding to the current signal
Data Source
AI summary
An imaging apparatus including a lens drive portion and an imaging lens. The lens drive portion, in response to a current signal moves the imaging lens to a position corresponding to the current signal in the optical axis direction. The imaging apparatus also includes a movement control portion that provides a current signal to the lens driving portion. The current signal is gradually changed from a first current signal corresponding to a first position before movement of the imaging lens, to a second current signal corresponding to a second position after movement.