Multi-optical-axis Sensor Side Indicator Placement
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Solution Overview
Problem
The challenge is to design a multiple optical-axis photoelectric sensor that can be downsized while maintaining the ability to perform various state displays without compromising its characteristics, particularly in scenarios where space is limited due to increased package density and the need for a slim case design.
Innovation Solution
The solution involves a multiple optical-axis photoelectric sensor with a longitudinally extending detection surface and inter-optical-axis indication units, including indicators that display information such as control input states, safe special function states, and interlock states, utilizing a 7-segment indicator to convey information efficiently, and a display controlling unit to manage these displays without interfering with the optical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the case is designed to be as slim as possible, then the device size is reduced, but the space for installing indicators is limited
Solution Approach 1:
The indicator is positioned on the side surface of the case rather than on the front surface, utilizing the lateral dimension to accommodate the indicator without increasing the front-facing footprint. This allows the case to remain slim while providing adequate space for the indicator assembly.
Solution Approach 2:
The indicator is divided into multiple independent indicator elements (first indicator and second indicator) that can be separately positioned and controlled. This segmentation allows each indicator to be optimally positioned on the side surface without interfering with the optical axes or requiring excessive space.
2Reliability
If the inter-optical-axis pitch is made shorter to ensure advanced safety, then the package density is increased, but the space for installation of indicators is reduced
Solution Approach 1:
By moving the indicator assembly to the side surface of the case, the solution utilizes the lateral dimension rather than competing for space along the optical axis. This allows the inter-optical-axis pitch to be reduced for enhanced safety while the indicator remains accommodated on the case perimeter.
Solution Approach 2:
The side surface of the case serves as an intermediary space that mediates between the compact optical element arrangement and the indicator display requirement. This intermediate positioning allows both high package density and adequate indicator space to coexist.
3Loss of information
If indicators are arranged on the front surface of the case, then the state display is visible, but the optical axes may be interfered with
Solution Approach 1:
The indicator is repositioned from the front surface to the side surface of the case, utilizing the lateral dimension to eliminate optical interference. This positioning ensures that the indicator does not obstruct the optical paths while remaining visible for state display purposes.
Solution Approach 2:
The indicator assembly is positioned asymmetrically on the side surface rather than centrally on the front surface. This asymmetric placement naturally avoids the optical axes while maintaining visibility, as the optical paths are typically arranged symmetrically along the front surface.
4Area of stationary object
If the light amount of the light-projecting element is increased to allow wide light curtain, then the light-receiving sensitivity must be enhanced, but the device complexity increases
Solution Approach 1:
The light curtain is divided into multiple discrete optical axes rather than using a single wide beam. This segmentation allows each optical element to operate at moderate intensity while collectively providing wide coverage, reducing the complexity requirements for individual components.
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 allows for effective downsizing of the sensor while maintaining its functionality, ensuring clear state displays and preventing interference with the optical axes, thus enhancing operational safety and visibility.
Implementation Method 1
a light-projecting element, and a light-receiving element
Implementation Method 2
light interception of the optical axis is detected to thereby forcibly suspend the operation of the hazardous source
Data Source
AI summary
A demand for downsizing of a multiple optical-axis photoelectric sensor can be coped with, and various state displays are performed.An inter-optical-axis indication unit is arranged between two adjacent optical axes so as not to interfere with the optical axis located in a lower end portion of a receiver. The inter-optical-axis indication unit is capable of displaying at least one piece of information out of a control input state, a safe special function state, a synchronization type, and an interlock state.