3D Scanner Lens Reciprocating Motion Control

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Solution Overview

Problem

Conventional three-dimensional scanners face instability in focal position due to variations in handpiece inclination, leading to inconsistent depth of field and challenging user-dependent adjustments, which can result in inadequate three-dimensional data acquisition of object surface geometry.

Innovation Solution

A three-dimensional scanner equipped with a lens that makes reciprocating linear motion, an angle detector to monitor inclination, and a controller to adjust the lens operation, ensuring stable focal positioning regardless of handpiece angle through amplitude control and frame rate adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the handpiece is inclined at various angles during use, then the component of gravity in the reciprocating direction varies, but the central position of reciprocating motion of the lens becomes unstable, causing the focal position to move away from or come closer to the tip end of the handpiece

Engineering Contradiction:

Improvehandpiece inclination angleVSAvoidfocal position stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

An angle detector detects the inclination angle of the handpiece, and a controller receives this detection result to determine the central position of reciprocating motion. The controller adjusts the reciprocating motion based on the detected angle, ensuring the focal position remains stable despite variations in handpiece inclination.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent makes the central position of reciprocating motion dynamically adjustable based on the detected inclination angle. Instead of fixing the central position, the system adapts it in real-time according to the handpiece angle, allowing stable focal positioning across various inclination angles.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the user manually adjusts the handpiece position to compensate for focal position shifts, then the focal position can be maintained, but the operation becomes complex and dependent on user skill

Engineering Contradiction:

Improvefocal position accuracyVSAvoiduser operation complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system automatically compensates for focal position shifts caused by handpiece inclination. The angle detector and controller work together to self-adjust the reciprocating motion parameters, eliminating the need for manual user intervention and making the system easy to operate regardless of user skill level.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical adjustment with an automated control system. Instead of relying on user skill to manually position the handpiece, an electronic control system with angle detection and automated reciprocating motion control takes over, simplifying the operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Area of stationary object

If the lens reciprocating motion amplitude is increased to expand the depth of field, then more of the object can be imaged, but the focal position becomes less stable and requires more frequent adjustments

Engineering Contradiction:

Improvedepth of field rangeVSAvoidfocal position consistency

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent dynamically adjusts the reciprocating motion parameters based on the detected inclination angle. By adapting the motion characteristics to the current angle, the system maintains focal position stability while optimizing the depth of field for each specific operating condition.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The controller changes the reciprocating motion parameters (such as amplitude and frequency) based on the detected inclination angle. This allows the system to optimize both the depth of field and focal position stability for each specific angle, rather than using fixed parameters.

Inventive Principle:

Principle #35Parameter changes

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 enables consistent and accurate acquisition of three-dimensional data of object surface geometry by maintaining a stable focal position and depth of field, independent of handpiece inclination, improving data quality and user convenience.

Implementation Method 1

a lens driver configured to drive the lens to make reciprocating motion in a linear direction

Methodology Applied

Scientific EffectReciprocating motion:

Implementation Method 2

a component in a direction of reciprocating motion, of gravity applied to a lens in the handpiece is varied with variation in angle of inclination of the handpiece

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS20240390118A1Three-Dimensional Scanner and Control Method

Publication Date: 2024.11.28 J MORITA MANUFACTURING CORP

AI summary

A three-dimensional scanner includes imaging circuitry configured to take an image of an object located at a focal position of a lens, a lens driver configured to drive the lens to make reciprocating motion in a linear direction, an angle detector configured to detect variation in angle of inclination of the lens with respect to a prescribed direction, and processing circuitry configured to control an operation of the lens in accordance with the variation in angle of inclination detected by the angle detector.