Light Deflector Mount Unit and Anisotropic Conductive Film

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Solution Overview

Problem

Existing light deflectors face challenges in increasing the oscillation angle of movable portions without colliding with nearby components, which restricts the scanning angle and stability of electrical connections due to limited distance between the movable portion and the circuit board.

Innovation Solution

The light deflector incorporates a mount unit to increase the distance between the movable portion and the circuit board, and uses an anisotropic conductive resin film for stable electrical connections between the movable device and the circuit board, allowing for increased oscillation angles and scanning capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the oscillation angle of the movable portion is increased to enhance scanning capability, then the scanning angle is improved, but the movable portion collides with nearby components such as the circuit board

Engineering Contradiction:

Improvescanning angleVSAvoidcollision with components

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a mount unit that positions the movable portion in a higher spatial dimension (vertical direction) relative to the circuit board. By increasing the vertical separation distance through the mount unit structure, the movable portion can oscillate through larger angles without colliding with the circuit board, thus resolving the contradiction between scanning angle and collision prevention.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If the distance between the movable portion and the circuit board is increased to prevent collision, then the oscillation angle is improved, but the electrical connection stability deteriorates

Engineering Contradiction:

Improveoscillation angleVSAvoidelectrical connection stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent employs an anisotropic conductive resin film as an intermediary material between the movable portion and the circuit board. This resin film maintains stable electrical connections even when the components are separated by a larger distance, enabling both increased oscillation angle and reliable electrical connection simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the distance between the movable portion and the circuit board is increased to allow larger oscillation angles, then the scanning capability is improved, but the risk of wire cutoff or electrode junction failure increases

Engineering Contradiction:

Improvescanning capabilityVSAvoidwire and electrode connection reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces traditional mechanical wiring connections with an anisotropic conductive resin film that provides electrical connection through its unique material properties. This substitution eliminates the mechanical vulnerability of wires to cutoff and electrode junction failure, allowing increased oscillation angles while maintaining connection reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 prevents collisions and maintains stable electrical connections, enabling higher scanning angles and reducing the risk of wire cutoff or electrode junction failure, thus enhancing the light deflector's performance and reliability.

Implementation Method 1

an anisotropic conductive resin film to conduct electricity from the movable device to the circuit board

Methodology Applied

Scientific EffectAnisotropic conduction: Anisotropy

Data Source

PatentUS12135416B2Light deflector, distance measuring device, projection device, and mobile object

Publication Date: 2024.11.05 RICOH CO LTD

AI summary

A light deflector includes a movable device; a drive unit configured to drive the movable device; an input wiring board configured to apply electric power from the drive unit to the movable device; and an anisotropic conductive resin film through which the input wiring board is connected to an input part. The movable device includes a movable portion including a reflector, between a pair of drive beams; a pair of supporting parts supporting the pair of drive beams; and a mount unit secured to the pair of supporting parts. The pair of drive beams supports the movable portion to allow the movable portion to oscillate around an oscillation axis. Each of the pair of drive beams includes a beam member and an actuator. At least one of the pair of supporting parts includes the input part to which electric power is input from the input wiring board to the actuator.