Reading Device Reference Scale Placement for Dimensional Accuracy
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Solution Overview
Problem
Existing reading devices face challenges in accurately measuring the dimensions of objects due to limitations in precision and the need for separate scanning of objects and reference scales.
Innovation Solution
A reading device with a carriage and optical sensor that scans objects on a contact glass, where a reference scale extending in both main and sub-scanning directions is positioned outside the image acquisition range, allowing simultaneous scanning of objects and reference scales to enhance measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the reference scale is placed inside the image acquisition range, then the reference scale can be scanned together with the object, but the available scanning area for the object is reduced
Solution Approach 1:
The reference scale is positioned in the sub-scanning direction outside the object placement area but within the carriage movement range. This spatial arrangement in a different dimension allows the optical sensor to capture both the object and reference scale ticks during the same carriage traversal without reducing the effective object scanning area.
2Area of stationary object
If the reference scale is placed outside the maximum movement range of the carriage, then the object scanning area is maximized, but the reference scale cannot be scanned simultaneously with the object
Solution Approach 1:
The reference scale is positioned within the carriage maximum movement range in the sub-scanning direction, allowing the optical sensor to capture reference scale ticks at the extreme positions during normal object scanning operations. This enables simultaneous acquisition without compromising object scanning area.
Solution Approach 2:
The reference scale ticks are pre-positioned at specific locations within the carriage movement range. During object scanning, the carriage naturally passes through these positions, allowing the optical sensor to capture reference scale images in advance alongside object images, eliminating the need for separate reference scale scanning operations.
3Measurement precision
If separate scanning of objects and reference scales is performed, then measurement precision can be maintained, but scanning time increases
Solution Approach 1:
The system merges the object scanning function with the reference scale scanning function into a single carriage movement operation. The optical sensor simultaneously captures object images and reference scale tick images during one carriage traversal, eliminating the need for separate scanning operations and doubling the scanning efficiency.
Solution Approach 2:
The carriage and optical sensor system is designed to perform multiple functions: scanning objects within the object placement area and scanning reference scale ticks at extreme positions. This multi-functional design allows a single scanning operation to serve both measurement reference purposes and object imaging purposes.
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 configuration enables precise measurement of object dimensions by allowing simultaneous imaging of objects and reference scales, improving measurement accuracy and operability for both planar and three-dimensional objects.
Implementation Method 1
the placed object to be scanned is irradiated with light. Then, the light reflected by the placed object to be scanned is detected
Data Source
AI summary
A reading device includes a carriage configured to move in a sub-scanning direction with reference to an object placed on a contact glass, an optical sensor attached to the carriage, the optical sensor being configured to scan the object placed on the contact glass to obtain an image of the object, and a reference scale used as a reference when a dimension of the object is computed based on the image obtained by the optical sensor. In the reading device, the reference scale extends in a main scanning direction and a sub-scanning direction with reference to the object, and is disposed outside a range of image acquisition in which the optical sensor scans the object to obtain the image of the object as the carriage moves and inside a maximum movement range in which the carriage is movable and the optical sensor obtains the image of the object.