Angle Detection Device Dynamic Revolution Specification

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Solution Overview

Problem

The manufacturing process of rotation amount acquisition apparatuses is labor-intensive due to the need for precise alignment of rotating bodies and is affected by mechanical errors such as hysteresis in gear transmission mechanisms, leading to bulkier designs and increased alignment complexity.

Innovation Solution

An angle detection apparatus with a processor that dynamically varies the specification condition for specifying the number of revolutions based on detected rotational angles and reduction ratios, using a transmission mechanism with multiple rotating bodies and angle detectors to reduce manufacturing labor and bulkiness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If correction angles are measured and stored in non-volatile memory for each individual apparatus, then detection accuracy is improved, but manufacturing becomes labor-intensive

Engineering Contradiction:

Improvedetection accuracyVSAvoidmanufacturing labor

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The system automatically measures the actual rotation amount by comparing the detected rotation amount with the specified rotation amount, and self-corrects the specified rotation amount without requiring manual measurement or storage of correction angles in non-volatile memory. The correction is performed dynamically during operation through the rotation amount specifying unit.

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If the transmission mechanism uses multiple rotating bodies with reduction gears, then the specification range of rotation amount is improved, but the device size increases

Engineering Contradiction:

Improvespecification rangeVSAvoiddevice size

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The system replaces complex mechanical transmission mechanisms with a computational approach. The processor calculates the specified rotation amount based on the detected rotation amount and reduction ratio without requiring multiple physical rotating bodies or reduction gears, thereby maintaining a wide specification range while minimizing device size.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Volume of moving object

If the transmission mechanism is simplified to reduce device size, then bulkiness is reduced, but mechanical errors such as hysteresis affect detection accuracy

Engineering Contradiction:

Improvedevice bulkinessVSAvoiddetection accuracy

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The system continuously compares the detected rotation amount with the specified rotation amount and uses the difference to correct the specified rotation amount. This feedback mechanism compensates for mechanical errors such as hysteresis in the transmission mechanism, maintaining detection accuracy even with simplified mechanical structures.

Inventive Principle:

Principle #23Feedback

4Measurement precision

If alignment of rotating bodies is made more precise, then detection accuracy is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidalignment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system changes from relying on precise mechanical alignment parameters to using computational parameters. The processor calculates the specified rotation amount based on the detected rotation amount and reduction ratio, eliminating the need for precise alignment of multiple rotating bodies and reducing manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3686559B1Angle detection device, rotation amount specifying unit and rotation driving unit

Publication Date: 2023.03.22 MINEBEAMITSUMI INC

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AI summary

Provided is an angle detection apparatus making it possible to reduce the labor of manufacturing while also suppressing bulkiness. The angle detection apparatus includes a first rotating body (120), a second rotating body (122), a first transmission mechanism (111) that causes the second rotating body (122) to rotate by reducing a speed of a rotation of the first rotating body (120), a first angle detector (Ds) that detects a rotational angle of the first rotating body (120), another second angle detector (Dm) that detects a rotational angle of the second rotating body (122), and a processor (40) that specifies a number of revolutions (Rs) of the first rotating body (120). The processor (40) specifies the number of revolutions (Rs) while dynamically varying a specification condition for specifying the number of revolutions (Rs) according to a numerical value decided according to the detected rotational angle of the first rotating body (120) and a reduction ratio (G1) of the first transmission mechanism (111), and the detected rotational angle of the second rotating body (122).