Stepped Lid Structure for Slim Piezoelectric Resonator Packages
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Solution Overview
Problem
Conventional packaged piezoelectric resonators face challenges in achieving slimmer and more compact designs due to misalignment issues and lid sagging under atmospheric pressure, which limits clearance between vibrating arms and the lid, potentially causing collisions.
Innovation Solution
The lid is designed with a stepped surface, featuring a thicker portion over the attachment arm to prevent sagging and a thinner portion over the vibrating arms to maintain sufficient clearance, ensuring proper alignment and reducing package height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the package is designed to be slimmer and more compact, then the overall size is reduced, but the clearance between vibrating arms and lid becomes insufficient, risking collisions
Solution Approach 1:
The lid is designed with non-uniform thickness, featuring a thicker portion positioned to support the vibrating arms and a thinner portion in other areas. This local variation in thickness provides structural support exactly where needed to maintain clearance, while allowing the overall package to be more compact. The thicker region acts as a localized reinforcement that prevents lid sagging without increasing the entire package volume.
2Length of stationary object
If the lid thickness is reduced to achieve a slimmer package, then the package height is reduced, but the lid sags under atmospheric pressure, causing collisions with vibrating arms
Solution Approach 1:
Instead of uniformly thickening the lid, the invention applies thickness variation locally. The lid has a thicker portion positioned strategically to counteract atmospheric pressure and prevent sagging, while maintaining thin sections elsewhere to keep the overall package height minimal. This localized reinforcement provides the necessary structural stability without compromising the slim profile.
3Reliability
If sufficient clearance is provided above and below the resonator to prevent collisions, then reliability is improved, but the package size increases
Solution Approach 1:
The lid's non-uniform thickness creates a thicker support region that extends the effective clearance zone locally without increasing the overall package volume. This strategic thickness variation provides enhanced clearance and collision prevention in critical areas while maintaining compact dimensions in non-critical areas, resolving the contradiction between reliability and size.
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 design effectively prevents lid sagging and maintains necessary clearance between vibrating arms and the lid, enabling the creation of even slimmer and more compact packaged piezoelectric resonators without risking collisions.
Implementation Method 1
a piezoelectric resonator and the case in which it is housed
Implementation Method 2
the lid is submitted to considerable pressure exerted by the atmosphere on the outside of the package
Data Source
AI summary
The packaged piezoelectric resonator comprises a case (170; 270) with a lid (140; 240) and a piezoelectric resonator element (110) housed in said case, The piezoelectric resonator element includes a planar tuning-fork-shaped part with two parallel vibrating arms (112, 114), and an additional attachment arm (118) intended for fixing the resonator element (110) to the bottom (172) of the case (170). The inside surface of the lid (140, 240) is stepped in such a way as to form a first portion (142) where the lid has a first thickness and a second portion (144) where the lid has a second thickness substantially greater than the first thickness, the first portion (142) extending at least over distal end portions (166, 168) of the vibrating arms (112, 114), and the second portion (144) extending at least over a part of the attachment arm (118).