HDD Base Member Model Identification via Coded Protrusions
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Solution Overview
Problem
In the manufacturing of hard disk drive base members, there is a challenge in accurately identifying whether a blank has been mistakenly supplied to a precision machining apparatus corresponding to the wrong model, leading to potential errors in machining and assembly, which can result in defective products not detected until shipping inspection.
Innovation Solution
A method involving the creation of distinct display portions on the base members, where specific machining operations create unique marks or features that can be recognized through image processing, allowing for early detection of misalignment between the material and machining program, thereby preventing incorrect assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display holes are formed in the base plate to identify the model, then model identification is enabled, but the base plate strength and hermetic seal are diminished
Solution Approach 1:
The patent uses coded protrusions as a physical copy or representation of model information, replacing the need for display holes. These protrusions encode model identification data through their presence, absence, or spatial arrangement, enabling model identification without compromising the base plate's structural integrity or hermetic seal.
2Measurement precision
If image recognition technology is used to read model names written in relief, then model identification is enabled, but noise is picked up due to surface irregular reflection requiring fine adjustment
Solution Approach 1:
The patent replaces optical image recognition with a mechanical reading method. A reading apparatus mechanically detects the coded protrusions through direct contact or proximity sensing, eliminating the problems of surface reflection noise and the need for fine optical alignment adjustments. This mechanical approach is more robust to surface variations.
3Measurement precision
If letters are written in relief to display the model name, then model identification is enabled, but misrecognition occurs due to blurring from stamper wear
Solution Approach 1:
The patent changes the physical parameter used for encoding model information from surface relief letters to three-dimensional coded protrusions. These protrusions have distinct geometric characteristics (height, position, shape) that can be reliably detected even with wear, as the fundamental geometric structure remains identifiable longer than fine surface lettering.
Data Source
AI summary
A base member on which a plurality of components are mounted includes a base main body, a coating formed on a surface of the base main body, and a display portion formed by a contrast between the coating and the surface of the base main body. The display portion displays a state by which it is determined whether or not the base main body has been machined in accordance with a corresponding machining program.