Projection Device Distance Meter Alignment for Building Construction
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Solution Overview
Problem
Existing projection methods require multiple reference objects to be placed conspicuously within a space for forming associations between drawing data and a projection plane, which is inconvenient and inefficient.
Innovation Solution
A projection system and method that uses a device equipped with a distance meter, projector, and controller to project drawing data onto a structure by measuring distances and angles to form an association between the drawing data and the projection plane, allowing for accurate alignment of reference lines and points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reference objects are placed conspicuously inside a space to form an association between drawing data and projection plane, then the association can be established, but the complexity of preparation and the number of objects increase
Solution Approach 1:
The patent extracts the essential function of reference objects (providing position and orientation information) and implements it through a simplified method using only two straight lines drawn on the projection plane. The controller calculates projection position and orientation by detecting these two lines and measuring distances from the projector, eliminating the need for multiple complex reference objects while maintaining association accuracy
Solution Approach 2:
Instead of using multiple reference objects to determine projection parameters, the patent inverts the approach by using the projection plane itself (through the two drawn lines) as the reference. The system projects a test pattern, detects the two lines on the projection plane, and derives all necessary projection information from them, simplifying the reference system while improving reliability
2Reliability
If multiple reference objects are placed in conspicuous positions, then association between drawing data and projection plane can be formed, but the ease of operation deteriorates due to the need to place and identify multiple objects
Solution Approach 1:
The patent applies preliminary action by having the operator simply draw two straight lines on the projection plane before projection. The controller then uses these pre-drawn lines to automatically calculate the projection position and orientation, eliminating the need for complex placement and identification of multiple reference objects during the projection setup process
Solution Approach 2:
The projection plane itself serves the dual purpose of being both the target for projection and the reference for position determination. By drawing lines directly on the projection plane, the system makes the projection surface self-referential, eliminating the need for separate reference objects and simplifying the operation to just drawing two lines
3Ease of operation
If distance and angle measurements are taken to determine projection position, then association between drawing data and projection plane is formed, but the measurement precision requirement increases
Solution Approach 1:
The patent replaces manual mechanical measurement methods with an optical detection system. The distance measurement unit uses optical means (such as laser ranging or time-of-flight sensors) to automatically measure distances from the projector to points on the projection plane, and the angle of view information is obtained through the imaging unit, eliminating the need for precise manual measurement while maintaining high accuracy
Solution Approach 2:
The patent introduces an imaging unit as an intermediary between the projector and the projection plane. This imaging unit captures images of the projection plane and the two drawn lines, providing the controller with precise position and orientation data without requiring direct manual measurement. The intermediary imaging system translates physical positions into digital information that the controller can process accurately
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
Enables efficient and accurate projection of drawing data onto a building structure by forming direct associations between positions in the drawing data and the projection plane, facilitating precise marking and installation tasks without the need for multiple reference objects.
Implementation Method 1
measuring a distance from each of three or more points which are not aligned in a straight line and are on either of two non-parallel straight lines on the projection plane to the projection device
Data Source
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AI summary
A projection method, which is executed by a projection device, for projecting drawing data for a building onto a projection plane of the building under construction includes: measuring a distance from each of three or more points which are not aligned in a straight line and are on either of two non-parallel straight lines on the projection plane to the projection device using a distance meter included in the projection device (S11); and projecting the drawing data onto a projection position on the projection plane which is determined based on the distance measured and the angle of the distance meter at the time at which the distance is measured (S15).