Detection Sensor With Enclosed Film for Same-Direction Infrared and Sound

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional detection sensors are unable to receive inputs from both infrared rays and sound waves from the same direction, and the piezoelectric polymer film is exposed, leading to potential contamination from dust and water.

Innovation Solution

A detection sensor design that includes a sensor unit with a piezoelectric film and a case, where a holder provides a transmissive part for infrared rays and a sound hole for sound waves, allowing input from the same direction while keeping the vibratable film enclosed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the piezoelectric polymer film is exposed from the opening to allow infrared rays and sound waves to reach it, then the sensor can receive inputs from the same direction, but the film is exposed to outside contaminants such as dust, dirt, and water

Engineering Contradiction:

Improveability to receive infrared rays and sound waves from the same directionVSAvoidcontamination of the vibratable film by dust, dirt, and water

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The holder is divided into distinct functional regions: a front portion with the transmissive part for infrared rays, and a peripheral portion with sound holes for sound waves. This segmentation allows each region to serve its specific function while collectively protecting the vibratable film from contamination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The transmissive part acts as an intermediary element that allows infrared rays to pass through to the vibratable film while blocking contaminants. The sound path serves as an intermediary channel that guides sound waves to the film without exposing it to the external environment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the vibratable film is enclosed within the case to protect it from contamination, then the film is protected from dust and water, but the sensor cannot receive both infrared rays and sound waves from the same direction

Engineering Contradiction:

Improveprotection of the vibratable film from contaminationVSAvoidability to receive inputs from the same direction

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The holder serves multiple functions simultaneously: it protects the vibratable film through the enclosed case structure, transmits infrared rays through the transmissive part, and conducts sound waves through the sound holes and sound path. This multi-functionality resolves the contradiction by enabling both protection and versatile input reception.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The sound path extends from the sound holes through the holder to the opening of the case, creating a three-dimensional sound transmission channel. This dimensional approach allows sound waves to reach the enclosed vibratable film without requiring direct exposure, while the transmissive part handles infrared rays from the front surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 sensor can receive inputs from both infrared rays and sound waves without exposing the vibratable film, ensuring protection from contamination and enabling simultaneous detection.

Implementation Method 1

The vibratable film is configured to be irradiated with infrared rays and thereby generate first electric signals through a pyroelectric effect

Methodology Applied

Scientific EffectPyroelectric effect: Pyroelectric Effect

Implementation Method 2

configured to be vibrated by sound waves and thereby generate second electric signals through a piezoelectric effect

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentEP4521080B1Detection sensor

Publication Date: 2025.10.15 HOSIDEN CORP

Figure 1A
Figure 1B
Figure 2A

AI summary

The invention provides a detection sensor being capable of receiving infrared ray input and sound wave input from the same direction and including a vibratable film unexposed to the outside. A detection sensor S1 includes a unit U and a holder H. The unit U includes a vibratable film 100 and a case 200 accommodating the vibratable film. The case 200 includes an opening 211 disposed on a Z-direction side relative to the vibratable film 100. The holder H includes a holding portion 10 holding the unit U, a front portion 20 disposed on the Z-direction side relative to the case 200, a transmissive part 30 configured to transmit infrared rays, a sound hole 40 to input therethrough sound waves, and a sound path 50. The transmissive part 30 is provided at the front portion 20, disposed on the Z-direction side relative to the opening 211 and the vibratable film 100, and opposed to the vibratable film 100. The sound hole 40 is provided in a portion of the front portion 20 that surrounds the transmissive part 30 and is open in the Z direction. The sound path 50 extends from the sound hole 40 to the opening 211.