Bifocal Double Group Lens Assembly Single Driver Zoom Focus
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Solution Overview
Problem
Conventional double group zoom lens assemblies require multiple movable components and independent drivers for zooming and focusing, leading to reduced reliability, increased cost, and a large, complex structure, which complicates miniaturization and portability in mobile phone camera lenses.
Innovation Solution
A bifocal double group lens assembly with a stationary first lens group and a moveable second lens group, utilizing a single linear driver for both zoom and focus functions, where the second lens group can focus on an infinitely distant object at two positions along the optical axis, optimizing the optical system's length and reducing the number of drivers needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double group zoom lens uses two lens groups moving synchronously with independent drivers for zooming and focusing, then zoom and focus functions are achieved, but the number of moveable members increases and reliability decreases
Solution Approach 1:
The patent combines the zoom and focus functions into a single movable lens group (the second lens group). This lens group performs both functions by moving to different positions: certain positions for zooming and other positions for focusing. This eliminates the need for separate movable lens groups and independent drivers for each function, thereby reducing the number of moveable members and improving reliability while maintaining adaptability.
Solution Approach 2:
The second lens group is designed as a multi-functional component that can perform both zooming and focusing operations. By making this single lens group capable of multiple functions through controlled movement to specific positions, the patent reduces system complexity and the number of required drivers, thus improving reliability without sacrificing functional versatility.
2Adaptability or versatility
If a double group zoom lens uses two independent drivers for zooming and focusing operations, then both functions are executed, but the cost and size of the lens assembly increase
Solution Approach 1:
The patent merges the control of zoom and focus operations into a single driver that controls the movement of the second lens group. This eliminates the need for two independent drivers, thereby reducing the size and cost of the lens assembly while maintaining the capability to perform both zooming and focusing functions.
Solution Approach 2:
A single driver is designed to control the second lens group for both zooming and focusing operations. This multi-functional driver reduces the overall number of components, simplifies the control system, and decreases the size and cost of the lens assembly while preserving full operational capability.
3Adaptability or versatility
If a double group zoom lens uses a CAM barrel and driver for zooming mechanism, then zoom function is achieved, but the structure becomes complicated and mould cost increases
Solution Approach 1:
The patent extracts and eliminates the complex CAM barrel mechanism from the zoom system. Instead of using a CAM barrel and driver for zooming, the invention employs a simpler movement mechanism where the second lens group moves to predetermined positions to achieve zooming. This extraction of the complex mechanism simplifies the overall structure and reduces mould cost while maintaining the zoom function.
Solution Approach 2:
The patent replaces the mechanical CAM barrel zoom mechanism with a simpler positioning system. The zoom function is achieved by controlling the second lens group to move to specific positions rather than through complex mechanical linkages. This substitution of the mechanical system with a more straightforward positioning approach reduces structural complexity and manufacturing cost.
4Volume of moving object
If the lens assembly is miniaturized for mobile phone portability, then portability is improved, but the ability to achieve zoom and focus capability within set size becomes more difficult
Solution Approach 1:
The patent combines multiple functions (zoom and focus) into a single movable lens group, which reduces the overall space required for the lens assembly. This merging of functions allows the lens to maintain zoom and focus capabilities while being miniaturized for mobile phone portability.
Solution Approach 2:
The second lens group is designed as a multi-functional element that performs both zooming and focusing within a compact structure. This universal design allows the lens assembly to achieve full functionality in a minimized form factor, enabling portability without sacrificing capability.
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 solution results in a compact, low-cost lens assembly with improved reliability and reduced size, enabling efficient zoom and focus capabilities within a miniaturized form factor, while maintaining image quality and controlling aberrations through careful lens configuration and positioning.
Implementation Method 1
a stationary first lens group (10), having a negative refractive power, a second lens group (20), having a positive refractive power
Data Source
AI summary
A bifocal double group lens assembly, sequentially from the object side, comprises: a stationary first lens group with a negative refractive power, a second lens group with a positive refractive power being moveable along optical axis. The second lens group, at two different positions, can focus appropriately on an infinitely distant object when moving along the optical axis. When the lens assembly is in the wide angle mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the object side for focusing. When the lens assembly is in the Tele mode, and the object to be shot moves from an infinite distance to a near point, the second lens group will move toward the image side for focusing. A linear driver is employed to move the second lens group for executing the function of two-section zoom and continuous focus.