Vertical Light Barrier Elevator Door Monitoring
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Solution Overview
Problem
Conventional elevator door monitoring systems using light barriers are expensive and inefficient, requiring multiple long sensor strips and sequential activation, leading to prolonged evaluation times and increased costs.
Innovation Solution
A cost-effective monitoring device with vertically oriented light barriers, featuring a single or multiple transmitting elements arranged above the door and distributed receiving elements below, allowing for simultaneous evaluation and reduced sensor strip length, enabling faster monitoring and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light gratings with horizontal light barriers are used, then reliable door monitoring is achieved, but the system becomes expensive and requires multiple long sensor strips
Solution Approach 1:
The patent transitions from horizontal light barrier arrangement to vertical light barrier arrangement. Transmitters are positioned in the upper boundary region and receivers in the lower boundary region, creating vertical light paths that span the door opening height. This dimensional change reduces the required sensor strip length from door width to door height, and allows a single transmitter to serve multiple receivers along the vertical path.
Solution Approach 2:
A single transmitter in the upper boundary region can form light barriers with multiple receivers distributed along the lower boundary region. This multi-functional arrangement allows one transmitter to monitor multiple vertical light paths simultaneously, reducing the total number of transmitter-receiver pairs needed while maintaining comprehensive door monitoring coverage.
2Area of stationary object
If multiple transmitting elements are used sequentially, then complete area coverage is achieved, but evaluation time increases
Solution Approach 1:
By arranging transmitters vertically in the upper boundary region and receivers vertically in the lower boundary region, the system creates multiple vertical light paths that can be evaluated simultaneously. This vertical arrangement allows parallel evaluation of multiple light barriers within a single evaluation cycle, significantly reducing the time required compared to sequential evaluation of horizontal barriers.
3Reliability
If long sensor strips are used to monitor complete door width, then comprehensive monitoring is achieved, but component costs and installation complexity increase
Solution Approach 1:
The patent reorients the light barrier from horizontal (across door width) to vertical (across door height). Transmitters are mounted in the upper boundary region and receivers in the lower boundary region, creating vertical light paths. This reduces the required sensor strip length from the full door width to the door height, making installation simpler and reducing component requirements.
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 significantly reduces evaluation time, decreases component costs, and enhances detection precision by allowing multiple beams to be monitored simultaneously, while maintaining or improving resolution capabilities, thus providing safer and more efficient elevator door monitoring.
Implementation Method 1
the at least one transmitting element, together with each of the multiplicity of receiving elements forms a light barrier arrangement
Data Source
AI summary
A monitoring device for safeguarding a driven element against undesired collisions with an object lying on the movement path of the driven element including at least one transmitting element and a multiplicity of receiving elements, wherein the at least one transmitting element is arranged in a horizontal boundary region of an opening to be monitored, where the opening can be at least partially closed by the driven element, and the multiplicity of receiving elements are arranged in a horizontal, opposite boundary region in a distributed fashion along the opening to be monitored, wherein the at least one transmitting element, together with each of the multiplicity of receiving elements forms a light barrier arrangement, which can be evaluated individually.