Three-Frame Lens Apparatus for Voice-Coil Collision Reduction
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Solution Overview
Problem
Existing lens barrels in optical equipment face issues with collision and collision sound due to the lack of self-holding force in unenergized states, particularly when using voice coil motors, which can cause mechanical ends to collide and generate noise.
Innovation Solution
A lens apparatus with a three-frame system, each frame having a dedicated driving unit for movement and position holding, controlled by a controller to manage the frames' positions during power off, ensuring frames with self-holding forces maintain their positions and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a voice coil motor is used as a driving unit, then the device can achieve smooth movement and compact structure, but it cannot hold position in unenergized state causing collision and collision sound
Solution Approach 1:
The driving units are segmented into two types: first and third driving units with self-holding capability (e.g., stepping motors) and a second driving unit without self-holding capability (voice coil motor). This segmentation allows each driving unit to be optimized for its specific function while collectively solving the position holding problem.
Solution Approach 2:
The controller performs preliminary action by controlling the first and third driving units to move the first and third frames into positions that limit the movable range of the second frame before the second driving unit becomes unenergized. This preliminary positioning prevents collision and collision sound when the voice coil motor loses power.
2Object-affected harmful factors
If the movable range of the second frame is limited by positioning the first and third frames, then collision impact is reduced, but the controller complexity increases
Solution Approach 1:
The controller uses feedback from detection means that detect the positions of the first, second, and third frames to determine when to limit the movable range of the second frame. This feedback mechanism enables automatic, position-based control without requiring complex predetermined logic.
3Object-generated harmful factors
If the first and third frames are moved to limit the second frame's range, then collision sound is suppressed, but the optical system complexity increases
Solution Approach 1:
The first and third frames serve dual functions: they hold and position the first and third optical elements for optical functionality, and simultaneously act as positioning elements to limit the movable range of the second frame, preventing collision sound. This multi-functionality reduces the need for separate collision-prevention structures.
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 collision sound and mechanical impacts by controlling the frames' positions using self-holding forces, even when power is off, maintaining stability and reducing noise.
Implementation Method 1
a first driving unit configured to move the first frame in an optical axis direction in an energized state, and hold a position of the first frame in an unenergized state; a third driving unit configured to move the third frame in an optical axis direction in an energized state, and hold a position of the third frame in an unenergized state
Implementation Method 2
in the unenergized state, an optical element and the moving frame may be moved by their own weight or an inertial force
Implementation Method 3
in the unenergized state, an optical element and the moving frame may be moved by their own weight or an inertial force
Implementation Method 4
a second driving unit configured to move the second frame in an optical axis direction in the energized state, and not hold a position of the second frame in the unenergized state
Data Source
AI summary
An apparatus including: a first frame holding a first optical element, a second frame holding a second optical element, a third frame holding a third optical element, in order along an optical axis; a first driving unit moving the first frame when energized and holding the first frame when unenergized; a second driving unit moving the second frame when energized and not holding the second frame when unenergized; a third driving unit moving the third frame when energized and hold a position of the third frame when unenergized; and a controller controlling the first, second and third driving units, wherein the controller controls the second driving unit to become unenergized after at least a part of at least one of the first and third frames is moved within a movable range of the second frame.