Lens Driving Device for ToF Super-Resolution via Lens Shifting

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Solution Overview

Problem

The current Time of Flight (ToF) method for acquiring depth information in 3D content has low resolution per frame, and increasing pixel count to enhance resolution leads to increased camera module volume and cost.

Innovation Solution

A lens driving device with a cover, base, holder, coil, magnet, and elastic members that allow for mechanical movement of the lens to increase resolution through a super resolution (SR) technique without increasing sensor pixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the number of pixels of the sensor is increased to increase resolution, then the resolution is improved, but the volume and manufacturing cost of the camera module are greatly increased

Engineering Contradiction:
ImproveresolutionVSAvoidcamera module volume
Core Design Contradiction:
Measurement precisionVSVolume of stationary object

Solution Approach 1:

The patent applies the Dynamics principle by making the lens movable rather than static. The lens is driven by a voice coil motor to shift position dynamically, enabling super-resolution imaging through multiple captures at different positions. This mechanical dynamics approach replaces the static high-pixel-count solution, achieving high resolution without proportionally increasing sensor pixel count or module volume.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent employs Parameter changes by varying the lens position as a physical parameter to achieve super-resolution. By changing the lens position to multiple discrete locations and capturing images at each position, the system synthesizes high-resolution depth information. This parameter variation approach allows resolution enhancement without increasing sensor pixel density or camera module volume.

Inventive Principle:
Principle #35Parameter changes

2Measurement precision

If the number of pixels of the sensor is increased to increase resolution, then the resolution is improved, but the manufacturing cost is greatly increased

Engineering Contradiction:
ImproveresolutionVSAvoidmanufacturing cost
Core Design Contradiction:
Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent applies the Dynamics principle by making the lens movable rather than static. The lens is driven by a voice coil motor to shift position dynamically, enabling super-resolution imaging through multiple captures at different positions. This mechanical dynamics approach replaces the static high-pixel-count solution, achieving high resolution without proportionally increasing sensor pixel count or module volume.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent employs Parameter changes by varying the lens position as a physical parameter to achieve super-resolution. By changing the lens position to multiple discrete locations and capturing images at each position, the system synthesizes high-resolution depth information. This parameter variation approach allows resolution enhancement without increasing sensor pixel density or camera module volume.

Inventive Principle:
Principle #35Parameter changes

3Measurement precision

If a lens driving device is implemented to enable super resolution technique, then resolution is improved, but device complexity is increased

Engineering Contradiction:
ImproveresolutionVSAvoiddevice complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies Mechanics substitution by replacing complex mechanical lens driving mechanisms with an electromagnetic voice coil motor system. The voice coil motor provides precise lens positioning through electromagnetic force without requiring complex gears, belts, or motors. This substitution reduces mechanical complexity while enabling the super-resolution capability through controlled lens movement.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies Universality by designing the lens driving device to serve multiple functions: it enables super-resolution imaging, provides optical image stabilization, and allows for focus adjustment. The voice coil motor and elastic member combination serves as a multi-functional system that achieves resolution enhancement without requiring separate dedicated mechanisms for each function, thereby reducing overall device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

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

Achieves high-resolution depth information acquisition by mechanically shifting the lens to enhance image resolution using the SR technique, reducing the need for additional sensor pixels.

Implementation Method 1

a coil disposed on the base; a magnet disposed on the holder and facing the coil

Methodology Applied
Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

a lateral elastic member movably connecting the holder to the base

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentUS20250306333A1Lens driving device
Publication Date: 2025.10.02 LG INNOTEK CO LTD
  • US20250306333A1 patent drawing
  • US20250306333A1 patent drawing
  • US20250306333A1 patent drawing

AI summary

A lens driving device including a cover having an upper plate, a side plate and an inner yoke; a base; a holder; a coil; a magnet; and a lateral elastic member. The holder including a groove formed in the upper surface of the holder, and at least a portion of the inner yoke of the cover is inserted in the groove of the holder so that the holder engages with the inner yoke when the holder rotates.