Piezoelectric Vibration Motor Layout With Shared Coil Spring

Solution Overview

Problem

Existing vibration motors with piezoelectric ceramic plates face challenges in compact design and assembly efficiency due to the need for multiple coil springs to increase output, leading to increased length and complexity.

Innovation Solution

A vibration motor design featuring a plurality of vibrating bodies with projections and a first urging section, where the number of urging sections is fewer than the vibrating bodies, allowing for a more compact arrangement and efficient assembly by using a single coil spring to urge the vibrating bodies in the driving direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If multiple coil springs are arranged in the driving direction to increase output, then the driving force increases, but the length of the vibration motor increases

Engineering Contradiction:

ImproveoutputVSAvoidlength in driving direction

Core Design Contradiction:

PowerVSLength of moving object

Solution Approach 1:

Multiple coil springs are merged into a single coil spring that simultaneously urges multiple vibrating bodies. The coil spring is configured to contact and apply force to multiple vibrating bodies arranged in the driving direction, eliminating the need for separate coil springs for each vibrating body and reducing the overall length of the motor.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single coil spring performs multiple functions by urging multiple different vibrating bodies in the driving direction. Instead of each coil spring being dedicated to a single vibrating body, the universal coil spring serves all vibrating bodies, making the system more compact while maintaining the required driving force.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Power

If multiple coil springs are used to increase output, then the driving force increases, but the device complexity increases

Engineering Contradiction:

ImproveoutputVSAvoidnumber of components

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

Multiple coil springs are merged into a single coil spring that simultaneously urges multiple vibrating bodies. The coil spring is configured to contact and apply force to multiple vibrating bodies arranged in the driving direction, eliminating the need for separate coil springs for each vibrating body and reducing the overall length of the motor.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single coil spring performs multiple functions by urging multiple different vibrating bodies in the driving direction. Instead of each coil spring being dedicated to a single vibrating body, the universal coil spring serves all vibrating bodies, making the system more compact while maintaining the required driving force.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Power

If multiple coil springs are arranged to increase output, then the driving force increases, but assembly efficiency decreases

Engineering Contradiction:

ImproveoutputVSAvoidassembly efficiency

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

Multiple coil springs are merged into a single coil spring that simultaneously urges multiple vibrating bodies. The coil spring is configured to contact and apply force to multiple vibrating bodies arranged in the driving direction, eliminating the need for separate coil springs for each vibrating body and reducing the overall length of the motor.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single coil spring performs multiple functions by urging multiple different vibrating bodies in the driving direction. Instead of each coil spring being dedicated to a single vibrating body, the universal coil spring serves all vibrating bodies, making the system more compact while maintaining the required driving force.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enables a shorter motor length while maintaining driving efficiency, reducing assembly complexity and increasing productivity by minimizing the number of components required.

Implementation Method 1

A piezoelectric ceramic plate, which is a vibrating body, is applied to various devices. The vibration motor vibrates the piezoelectric ceramic plate.

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

The first coil spring urges the piezoelectric ceramic plate in a driving direction orthogonal to a direction in which the second coil spring urges the piezoelectric ceramic plate.

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11819882B2Vibration motor and driving device

Publication Date: 2023.11.21 SEIKO EPSON CORP

AI summary

A vibration motor includes a first vibrating body including a first projection and a second vibrating body including a second projection, the first vibrating body and the second vibrating body receiving electric power and vibrating to generate a driving force and transmitting the driving force to a driven section, a first coil spring configured to urge the first vibrating body and the second vibrating body in a driving direction and restrict positions of the first vibrating body and the second vibrating body in the driving direction, and a case housing the first vibrating body, the second vibrating body, and the first coil spring. The first vibrating body, the second vibrating body, and the first coil spring are arranged in the driving direction. The number of first coil springs is smaller than the number of first and second vibrating bodies in the urging direction.