Lens Barrel Motion Control for Overlapping Zoom and Focus Units
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Solution Overview
Problem
Existing lens systems face challenges in achieving high-precision driving and high-quality images while maintaining a compact size, particularly due to collisions and interference between lens units driven by manual and electric means, leading to issues like increased length and noise during high-speed zooming.
Innovation Solution
A lens apparatus with a first holding member for manual or external driving, a second holding member for electric driving, and a transmission member biased by a spring, controlled by a controller to manage overlapping movable ranges and prevent collisions, using a linear ultrasonic motor for focus adjustment and a position sensor to adjust driving parameters based on relative positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If lens units with manual driving and electric driving have overlapping movable ranges to shorten overall length, then the lens apparatus becomes more compact, but collisions and interference between lens units occur
Solution Approach 1:
The controller predicts the position of the manually driven lens unit based on its movement speed and acceleration, and提前 issues driving instructions to the electrically driven lens unit to prevent collision before it occurs. This preliminary action allows the system to maintain overlapping movable ranges while preventing collisions through advance planning.
Solution Approach 2:
The system continuously monitors the actual position of the manually driven lens unit and compares it with the predicted position. When a deviation is detected, the controller adjusts the driving instructions for the electrically driven lens unit in real-time. This feedback mechanism ensures reliable collision prevention while maintaining compact dimensions.
2Productivity
If high-speed zooming is implemented to improve productivity, then zooming speed increases, but oscillation and noise increase
Solution Approach 1:
The system dynamically adjusts the driving parameters of the electrically driven lens unit based on the predicted position and movement state of the manually driven lens unit. By continuously adapting the driving force and speed, the system achieves high-speed zooming while suppressing oscillation and noise through optimized dynamic control.
Solution Approach 2:
The controller changes the driving parameters (voltage, current, speed) of the electrically driven lens unit based on the predicted collision risk and relative position. By adjusting these parameters in real-time, the system maintains high zooming speed while minimizing harmful oscillation and noise generation.
3Reliability
If clearance is increased to prevent collision, then reliability improves, but the overall length of the lens apparatus increases
Solution Approach 1:
The system replaces the traditional mechanical clearance-based collision prevention with an intelligent control system that uses position prediction and feedback control. This substitution allows the lens units to operate in overlapping ranges without physical clearance, maintaining compact length while ensuring reliable collision prevention through electronic control.
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
Enables high-precision driving and high-quality images while reducing the overall size of the lens apparatus by minimizing unnecessary clearance and preventing collisions, suppressing oscillation and noise during high-speed zooming.
Implementation Method 1
a biasing member configured to bias the transmission member toward an end of the first range opposite to the first lens unit
Implementation Method 2
using a linear ultrasonic motor for focus adjustment
Data Source
AI summary
A lens apparatus includes a first holder holding a first lens unit and moving, manually or by an external driver, in an optical axis direction, a second holder holding a second lens unit and being electrically driven in the direction, a transmission member supported by the second holder to be movable in a first range in the direction relative to the second holder, a driving unit moving the second holder in the direction via the transmission member, a biasing member biasing the transmission member toward an end of the first range opposite to the first lens unit, and a controller controlling the driving unit. Movable ranges of the first and second holders in the direction overlap each other. The controller determines a relative position between the driving unit and the second holder in the direction, and changes a control of the driving unit based on the relative position.