Lens Driving Apparatus Vibration Reduction via Staged Focus Transfer
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Solution Overview
Problem
Existing lens driving actuators generate physical vibrations during auto focusing, making accurate focusing difficult in imaging apparatuses like mobile communication terminals and digital cameras.
Innovation Solution
A lens driving apparatus and method that suspends the lens at intermediate focus positions between the current and target focus positions, using a controller and driver with a serial interface to transmit control signals, reducing vibrations and improving driving speed by transferring the lens in stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the actuator transfers the lens directly to the target focus position, then the driving speed is improved, but physical vibration is generated making accurate focusing difficult
Solution Approach 1:
The patent divides the direct lens transfer into multiple staged transfers through intermediate focus positions. The controller determines intermediate focus positions between the present and target focus positions, and the driver transfers the lens in stages through these intermediates. This segmentation reduces the overall transfer distance at each stage, minimizing physical vibration while maintaining acceptable driving speed.
2Object-generated harmful factors
If the lens is transferred through multiple intermediate focus positions, then physical vibration is reduced, but the focusing time increases
Solution Approach 1:
The controller preliminarily determines and calculates intermediate focus positions based on preset rates before executing the lens transfer. By pre-calculating the optimal intermediate positions and preparing the transfer sequence in advance, the system minimizes unnecessary delays while ensuring vibration reduction through staged transfers.
3Ease of operation
If the actuator is formed of an instrument, then the driving function is achieved, but physical vibration is generated during operation
Solution Approach 1:
The patent implements dynamic control by allowing the lens to be suspended at intermediate focus positions during the transfer process. Rather than a static direct transfer, the system dynamically adjusts the lens position through multiple stages, controlling the actuator's movement to minimize vibration while maintaining operational driving function.
Data Source
AI summary
There are provided a lens driving apparatus and method for transferring a lens on a plurality of focus positions previously set, in which a physical or mechanical vibration generated by a lens driving actuator when auto focusing is improved. The apparatus includes: a controller controlling the lens to be suspended one or more intermediate focus positions interposed between a present focus position and a target focus position while controlling the lens to be transferred to the present focus position where the lens is presently located to the target focus position that is a target of transferring the lens among the plurality of focus positions; and a driver transferring the lens according to a driving control signal from the controller.