Pendulum Vibration Actuator Layout for Wiring Reliability

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Solution Overview

Problem

Existing vibration actuators suffer from adverse effects on wiring coupling due to the configuration where the magnet is provided at the fixed body and the coil is wound around the movable body, leading to potential long-term vibration interference with the power supply.

Innovation Solution

A vibration generation device with a pendulum that swings around a rotation axis, featuring a magnet and a coil positioned in a non-contact manner, and a detection unit to generate vibration opposite in phase from detected vibrations, reducing interference with the power supply wiring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the coil is wound around the core constituting the movable body and the flexible substrate supplies electric power to the coil, then the vibration actuator can generate vibration, but the vibration adversely affects coupling of the wiring for supplying electric power to the coil in the long term

Engineering Contradiction:

Improvevibration generation capabilityVSAvoidwiring coupling reliability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent divides the vibration generation system into two separate parts: the magnet is attached to the movable body (pendulum) while the coil is fixed to the stationary body (base). This segmentation ensures that the flexible substrate for power supply is attached to the stationary body rather than the movable body, preventing vibration from adversely affecting the wiring coupling in the long term while maintaining vibration generation capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent inverts the conventional configuration by placing the magnet on the movable body and the coil on the stationary body, rather than the traditional arrangement. This inversion allows the power supply wiring to remain stationary and avoids the long-term reliability issues caused by vibration affecting flexible substrate coupling

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If the magnet is provided at the fixed body and the coil is wound around the movable body, then the vibration actuator can operate, but the configuration causes vibration interference with the power supply wiring

Engineering Contradiction:

Improvevibration actuator operationVSAvoidvibration interference with power supply

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies inversion by reversing the conventional arrangement: instead of placing the coil on the movable body and magnet on the fixed body, it places the magnet on the movable body (pendulum) and the coil on the stationary body (base). This inversion eliminates vibration interference with the power supply wiring while maintaining the vibration actuator's operational capability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the coil from the movable body and relocates it to the stationary body, separating the power-generating component from the vibrating component. This extraction removes the source of vibration interference with the power supply wiring while preserving the overall vibration generation function through the magnet-coil interaction

Inventive Principle:

Principle #2Taking out (Extraction)

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

The solution effectively reduces vibration in the projector's projection optical device, minimizing image shaking and enhancing the reliability of the power supply by generating counter-vibration through a magnet-coil configuration that avoids direct contact and interference.

Implementation Method 1

at least one driving unit including a magnet that is provided at the pendulum and a coil that is provided at a configuration other than the pendulum and that is disposed to face the magnet in a non-contact manner, and configured to apply a driving force to the pendulum

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a magnet that is provided at the pendulum and a coil that is provided at a configuration other than the pendulum and that is disposed to face the magnet in a non-contact manner, and configured to apply a driving force to the pendulum

Methodology Applied

Scientific EffectMagnetic force interaction: Magnetism

Data Source

PatentUS12554183B2Vibration generation device, vibration reduction device, and electronic apparatus

Publication Date: 2026.02.17 SEIKO EPSON CORP

AI summary

A vibration generation device includes: a base configured to transmit vibration to an object; a pendulum provided at the base swingably around a rotation axis; and at least one driving unit including a magnet that is provided at the pendulum and a coil that is provided at a configuration other than the pendulum and that is disposed to face the magnet in a non-contact manner, and configured to apply a driving force to the pendulum. The pendulum includes a first side surface portion and a second side surface portion that intersect with a direction parallel to the rotation axis and are at opposite sides. A first driving unit includes a first magnet provided at the first side surface portion to be separated from the rotation axis, and a first coil disposed to face the first magnet in a non-contact manner.