Nested Piezoelectric Lens Holder for Fast Zoom Focus
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Solution Overview
Problem
Existing lens driving devices require a long time for focusing when zooming in or out due to the separate movement of zoom and focus lenses along the optical axis.
Innovation Solution
A lens holder driving device that includes a fixed-side member, first and second lens holders, and piezoelectric drivers to move these lens holders along the optical axis, allowing simultaneous movement of both lens holders to maintain focus during zooming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If zoom lens and focus lens are moved separately along the optical axis, then each lens can be controlled independently, but the focusing time becomes long when zooming in or out
Solution Approach 1:
The patent combines the movement control of the zoom lens and focus lens by making the second movable-side member (holding the focus lens) movable with respect to the first movable-side member (holding the zoom lens). This nested configuration allows both lenses to be moved simultaneously along the optical axis, reducing focusing time during zoom operations while maintaining independent control capability through the first and second piezoelectric drivers.
Solution Approach 2:
The patent implements a nested structure where the second movable-side member is positioned within the first movable-side member. The second movable-side member can move independently relative to the first movable-side member along the optical axis, enabling the focus lens to be adjusted while the zoom lens is being moved. This nested arrangement allows simultaneous movement of both lenses, solving the time loss problem during focusing after zooming.
2Productivity
If two piezoelectric drivers are used to move both lens holders, then simultaneous movement is achieved, but the device structure becomes more complex
Solution Approach 1:
The first movable-side member serves multiple functions: it holds the zoom lens, is movable by the first piezoelectric driver, and simultaneously serves as the support structure for the second movable-side member. The second movable-side member similarly serves dual purposes by holding the focus lens and being movable both by the second piezoelectric driver and relative to the first movable-side member. This multi-functionality reduces the need for additional separate components, managing structural complexity while enabling simultaneous lens movement for improved productivity.
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 device enables faster focusing by allowing both lens holders to move simultaneously along the optical axis, reducing the time required for focusing after zooming in or out.
Implementation Method 1
a first piezoelectric driver configured to include a first piezoelectric device and move the first movable-side member in a direction of the optical axis by a motion of the first piezoelectric device
Data Source
AI summary
A lens holder driving device includes a fixed-side member; a first lens holder configured to hold a first lens body; a second lens holder configured to hold a second lens body; a first movable-side member including the first lens holder; a second movable-side member including the second lens holder; a first piezoelectric driver that moves the first lens holder in an optical axis direction by a motion of a first piezoelectric device; and a second piezoelectric driver that moves the second lens holder in the optical axis direction by a motion of a second piezoelectric device. The second movable-side member is included in the first movable-side member and is movable in the optical axis direction with respect to the first lens holder. The first piezoelectric driver is provided in the fixed-side member, and the second piezoelectric driver is provided in the second movable-side member.