Absolute Linear Encoder for Rapid 3D Measurement Startup

Solution Overview

Problem

Conventional three-dimensional measuring instruments require time to detect the initial position of the probe after power activation due to the use of incremental-type linear encoders, especially in large systems, leading to delayed measurement start-up.

Innovation Solution

Incorporation of an absolute-type linear encoder that provides the immediate absolute position of the moving mechanism, allowing the controlling device to determine the probe's position without needing a separate detection operation, thereby enabling rapid start-up of measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an incremental-type linear encoder is used to control the probe position, then the position can be controlled during operation, but the original position must be detected after power activation which takes time

Engineering Contradiction:

Improveposition controlVSAvoidtime to start measurement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the incremental-type linear encoder with an absolute-type linear encoder. This substitution changes the fundamental operating principle from relative position tracking (incremental) to absolute position memory (absolute type), eliminating the need for original position detection after power activation while maintaining position control functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If the probe position is greatly apart from the original position of the linear encoder, then the measurement can be performed over a large range, but it takes significantly more time to detect the original position

Engineering Contradiction:

Improvemeasurement rangeVSAvoidtime to detect original position

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent replaces the incremental-type linear encoder with an absolute-type linear encoder. This substitution changes the fundamental operating principle from relative position tracking (incremental) to absolute position memory (absolute type), eliminating the need for original position detection after power activation while maintaining position control functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8578618B2Three-dimensional measuring instrument

Publication Date: 2013.11.12 MITUTOYO CORP

AI summary

According to the present invention, a three-dimensional measuring instrument includes a spindle that moves an object to be controlled in a predetermined axis direction; and a controlling device that controls a position of the object to be controlled by controlling a position of the spindle. The three-dimensional measuring instrument further includes an absolute-type linear encoder that outputs an absolute position of the spindle. With this, it is possible to start measurement by the three-dimensional measuring instrument in a short period of time.