Optical Disk Printing Center Detection via Hole Scanning
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Solution Overview
Problem
Existing printing apparatuses for optical disks, such as CD-R and DVD-R, face challenges in accurately determining the center position due to low dimensional accuracy of the outer circumference, leading to positional errors in printing.
Innovation Solution
A printing apparatus and method that utilizes a detecting unit to emit light, receive reflected light, and move over a hole at the center of the optical disk to accurately detect the position of the center by analyzing changes in light amount, allowing for precise determination of the print position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the center of the optical disk is obtained by detecting the outer circumference, then the detection process is simple, but the positional accuracy of the center is low
Solution Approach 1:
The patent extracts the hole at the center of the optical disk as a separate detection target from the outer circumference. By using the hole (which has high dimensional accuracy) instead of the outer circumference (low dimensional accuracy) as the reference feature, the system achieves high center position accuracy while maintaining simple detection processes.
2Productivity
If the print start position is determined based on the detected center position, then the printing process is efficient, but positional errors in printing occur due to inaccurate center detection
Solution Approach 1:
The patent replaces mechanical/optical detection of the outer circumference with optical detection of the hole structure. The detecting unit emits light to the hole and receives reflected light to detect the center position, substituting a more accurate detection mechanism that leverages the high dimensional accuracy of the hole rather than the low-accuracy outer circumference.
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 high-accuracy center detection of optical disks, reducing positional errors in printing and improving the precision of image placement on optical disks.
Implementation Method 1
a detecting unit configured to emit light to the holding unit and the optical disk, receive reflected light, and detect change in the amount of the received light
Data Source
AI summary
In a printing unit, a detecting unit is made to pass over a hole formed at the center of an optical disk and to detect the position of the center of the hole, and an obtaining unit obtains the detected position of the center of the hole as the center of the optical disk. Then, a setting unit sets a print position for the optical disk based on the obtained position of the center of the optical disk.