Piezoelectric Oscillator Patterning for Precise Frequency Tuning
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Solution Overview
Problem
Conventional quartz oscillators face difficulties in frequency control due to the hardness of piezoelectric materials like quartz, requiring complex processing and micro-cutting techniques, which also lead to unnecessary oscillation modes.
Innovation Solution
A pattern process is applied to the surface or interior of piezoelectric materials to form patterned zones through material removal or modification, using techniques like laser processing, dry etching, or heat treatment, allowing for precise frequency adjustment without altering the material's appearance and eliminating unwanted oscillation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods modify the appearance and size (mass) of quartz to control frequency, then frequency control is achieved, but the high hardness of quartz makes it difficult to process, increasing the difficulty of frequency control
Solution Approach 1:
The patent replaces traditional mechanical cutting and shaping methods with a pattern process that can be applied to the surface or interior of the piezoelectric material. This substitution allows frequency control without the need for difficult mechanical processing of hard quartz materials.
Solution Approach 2:
The patent changes the physical or chemical parameters of the piezoelectric material through the pattern process, which modifies the material's properties to achieve frequency control. This approach avoids the need for mechanical removal or addition of material, thereby simplifying the manufacturing process while maintaining precision.
2Manufacturing precision
If laser micro-cutting is used to modify the electrode surface to change the mass of piezoelectric materials, then frequency adjustment is possible, but unnecessary oscillation modes are generated
Solution Approach 1:
The patent applies the pattern process locally to specific regions of the piezoelectric material, creating localized modifications that precisely control frequency without affecting other areas. This localized approach prevents the generation of unnecessary oscillation modes that would result from broader modifications.
Solution Approach 2:
The patent converts the potential harm of unnecessary oscillation modes into a benefit by designing the pattern process to specifically target and eliminate these unwanted modes. The pattern process is configured to suppress harmful oscillations while maintaining the desired frequency, effectively turning a problem into a solution.
3Adaptability or versatility
If the appearance of piezoelectric material is altered to control frequency, then frequency modulation is achieved, but the processing complexity increases due to material hardness
Solution Approach 1:
The patent replaces complex mechanical processing operations with a pattern process that can be applied more simply to the piezoelectric material. This substitution reduces processing complexity while maintaining the ability to modulate frequency effectively.
Solution Approach 2:
The pattern process serves multiple functions: it controls frequency, maintains material appearance, and simplifies processing. This multi-functionality reduces the need for separate processing steps, thereby decreasing overall device complexity while enhancing frequency modulation capability.
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 method enables accurate frequency modulation of oscillators by creating spatial filters that block unnecessary frequencies and modes, simplifying the processing of hard materials and improving frequency control.
Implementation Method 1
The negative piezoelectric effect means a process in which electrical energy is converted into mechanical energy when the piezoelectric material is deformed caused by being applied with an electric field
Implementation Method 2
The piezoelectric effect includes positive piezoelectric effect and negative piezoelectric effect
Implementation Method 3
The pattern process includes a material removal, a material modification, or a combination thereof. The material removal area or the material modification area is formed by laser
Implementation Method 4
The pattern process includes a material removal, a material modification, or a combination thereof. The material removal area or the material modification area is formed by heat treatment
Data Source
AI summary
An oscillator frequency modulation method includes: providing a piezoelectric material having a surface and an interior; and performing a pattern process on the piezoelectric material by a laser. A patterned processing zone is formed on the surface and/or in the interior of the piezoelectric material. The pattern process may be a material removal and/or a material modification. Therefore, without changing the appearance of the piezoelectric material, the pattern process on the piezoelectric material through the laser can accurately adjust the frequency of the oscillator and block unnecessary mode at the same time. An oscillator piezoelectric structure with frequency modulation is also provided.