Grounding Detection Device Using Preliminary Light Shielding

Solution Overview

Problem

Conventional electronic component mounters falsely detect grounding due to chattering noises and require a dead region to avoid false detection, leading to delayed detection of actual grounding events.

Innovation Solution

The grounding detection device positions the detection target portion in an ungrounded state such that at least part of the light is shielded, eliminating the need for a dead region and allowing for prompt detection of grounding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dead region is secured next to the detection region to avoid false detection, then false detection is prevented, but grounding detection time is delayed

Engineering Contradiction:

Improvedetection accuracyVSAvoidgrounding detection time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The detection target portion is preliminarily positioned to extend into the detection region while maintaining an ungrounded state. This preliminary arrangement allows the light shielding function to be activated before the component is fully grounded, enabling immediate detection of grounding events without requiring a dead region, thus resolving the contradiction between detection accuracy and detection time.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the detection target portion is completely outside the detection region in an ungrounded state, then false detection is avoided, but detection response is delayed

Engineering Contradiction:

Improvedetection accuracyVSAvoiddetection response speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The detection target portion is preliminarily positioned to extend into the detection region while maintaining an ungrounded state. This preliminary arrangement allows the light shielding function to be activated before the component is fully grounded, enabling immediate detection of grounding events without requiring a dead region, thus resolving the contradiction between detection accuracy and detection time.

Inventive Principle:

Principle #10Preliminary action

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

This approach enables quick and accurate detection of grounding without false positives, reducing the time lag between the actual grounding and detection, and minimizing excessive pushing force on electronic components.

Implementation Method 1

an optical fiber sensor configured to detect the grounding of an electronic component to a board... the amount of light receiving section by a light receiver of the optical fiber sensor is reduced

Methodology Applied

Scientific EffectLight detection: Photoelectric Effect

Data Source

PatentEP3740055B1Grounding detection device and electronic component mounter

Publication Date: 2023.03.01 FUJI CORP

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AI summary

It is an object of the present invention to provide a grounding detection device (6) and an electronic component mounter (1) capable of quickly detecting grounding. The grounding detection device (6) includes a photoelectric sensor (60) that emits light to a detection region (A) in which the detection target portion (361a) moves in conjunction with the grounding of the electronic component (P) to a board (B) and receives light from the detection region (A), and a grounding discrimination section (7) that discriminates between the presence or absence of the grounding based on a signal from the photoelectric sensor (60). The detection target portion (361a) is disposed in the detection region (A) in the ungrounded state.