Surface Mount Crystal Device Seam Welding Geometry
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Solution Overview
Problem
The existing crystal devices for surface mounting face challenges in maintaining airtightness and productivity due to issues with seam welding, particularly as devices miniaturize, leading to inadequate jointing at the outer circumference corners and reduced sealing paths.
Innovation Solution
The crystal device is configured with a metal cover having outer circumference corners with a smaller radius of curvature than the metal ring, and longer straight portions, ensuring sufficient jointing and sealing paths, while allowing for a broader range of electric current values during seam welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the outer circumference corners of the metal cover are formed with arc shapes to match the metal ring, then the metal cover can be prevented from protruding, but the seam welding at the corners becomes insufficient leading to poor jointing and airtight loss
Solution Approach 1:
The patent applies local quality by creating a distinction between the corner regions and straight portion regions of the metal cover. The corner portions have a first thickness while the straight portions have a second thickness greater than the first thickness. This localized thickness variation ensures that the straight portions provide sufficient material for reliable seam welding and sealing paths, while the corner portions maintain the necessary geometric fit within the metal ring.
Solution Approach 2:
The patent changes the thickness parameter of the metal cover at different locations. By making the straight portions thicker than the corner portions, the patent ensures adequate material availability for welding operations in the straight portions, thereby improving weld quality and airtightness without compromising the overall fit of the cover.
2Shape
If the outline of the metal cover is made smaller than the metal ring to prevent protrusion, then the fit is improved, but the sealing path length is reduced leading to weaker joint strength
Solution Approach 1:
The patent applies local quality by creating a distinction between the corner regions and straight portion regions of the metal cover. The corner portions have a first thickness while the straight portions have a second thickness greater than the first thickness. This localized thickness variation ensures that the straight portions provide sufficient material for reliable seam welding and sealing paths, while the corner portions maintain the necessary geometric fit within the metal ring.
Solution Approach 2:
The patent utilizes the arc-formed curved portions at the corners of the metal cover and metal ring to create a smooth transition and optimal contact area. The curved geometry at the corners complements the thickness variation, ensuring that the sealing paths are maximized in the straight portions where the greater thickness provides enhanced welding capability and joint strength.
3Area of stationary object
If miniaturization is advanced to reduce device size, then the planar outline is reduced, but the seam welding quality deteriorates due to insufficient jointing at corners
Solution Approach 1:
The patent applies local quality by creating a distinction between the corner regions and straight portion regions of the metal cover. The corner portions have a first thickness while the straight portions have a second thickness greater than the first thickness. This localized thickness variation ensures that the straight portions provide sufficient material for reliable seam welding and sealing paths, while the corner portions maintain the necessary geometric fit within the metal ring.
Solution Approach 2:
The patent implements preliminary action by pre-forming the thickness variation in the metal cover before the seam welding process. The straight portions are designed with greater thickness from the outset, ensuring that when welding occurs, there is adequate material available to form strong joints and sealing paths, thereby preventing welding defects before they can occur.
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 enhances welding efficiency, ensures reliable airtightness, and improves productivity by ensuring sufficient sealing paths and reducing the likelihood of poor jointing, even at smaller device sizes.
Implementation Method 1
jointed to the metal ring, which is provided to an end face of an opening of the ceramic case, by seam welding
Data Source
AI summary
A crystal device for surface mounting, in which a metal cover is jointed to the metal ring by seam welding, satisfies relationships A2/A1<C2/C1 and B2/B1<D2/D1, where A1 is a length of a long side of the metal ring, A2 is a length of a straight portion of a long side except for curved portions, B1 is a length of a short side of the metal ring, B2 is a length of a straight portion of the short side except for the curved portions thereof, C1 is a length of a long side of the metal cover, C2 is a length of a straight portion of the long side except for the curved portions thereof, D1 is a length of a short side of the metal cover, and D2 is a length of a straight portion of the short side except for the curved portions thereof.