Condenser Lens Infrared Sensor Module for Remote Temperature Sensing

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Solution Overview

Problem

Existing body temperature measurement tools require physical contact or close proximity to the user, making them inconvenient for continuous monitoring, especially when the user is outdoors.

Innovation Solution

A temperature sensing module comprising a hollow base, an infrared temperature sensor, and a condenser lens, which reduces the measurement angle and allows for remote body temperature measurement, enabling integration into common electronic devices like smartphones and displays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a forehead thermometer with a wide field of view (≥45 degrees) is used, then the infrared temperature sensor can detect a broader area, but the measurement distance must be very close (≤5 cm) to the forehead

Engineering Contradiction:

Improvefield of view of infrared temperature sensorVSAvoidmeasurement distance

Core Design Contradiction:

Area of stationary objectVSLength of moving object

Solution Approach 1:

A condenser lens is introduced as an intermediary optical element between the target object and the infrared temperature sensor. The lens condenses infrared rays from a distant target onto the photosensitive surface of the sensor, enabling remote measurement while maintaining measurement accuracy. This mediator allows the system to overcome the limitation of wide field of view requiring close proximity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If body temperature measurement tools require physical contact or close proximity, then accurate temperature measurement can be achieved, but the user must carry the tool additionally and it causes disturbance and inconvenience

Engineering Contradiction:

Improvebody temperature measurement accuracyVSAvoiduser convenience

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent replaces the mechanical approach of close-contact measurement with an optical system using a condenser lens. This substitution allows infrared radiation to be focused from a distance onto the sensor, eliminating the need for physical contact or close proximity while maintaining measurement precision. The user can simply point the device at the target from a distance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Length of moving object

If the field of view of the infrared temperature sensor is reduced using a condenser lens, then remote measurement capability is improved, but the lens adds complexity to the device structure

Engineering Contradiction:

Improvemeasurement distanceVSAvoidstructure of temperature sensing module

Core Design Contradiction:

Length of moving objectVSDevice complexity

Solution Approach 1:

The condenser lens serves multiple functions simultaneously: it condenses infrared rays from distant targets, defines the field of view, and focuses radiation onto the photosensitive surface. By combining these functions in a single optical element, the device achieves remote measurement capability without proportionally increasing structural complexity.

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

Enables remote and continuous body temperature monitoring without the need for the user to carry a separate measurement tool, providing increased convenience and accuracy by allowing measurements from a distance of up to 40 cm or more.

Implementation Method 1

the infrared temperature sensor comprises a photosensitive surface, and the photosensitive surface faces the first opening

Methodology Applied

Scientific EffectInfrared radiation detection: Infrared Radiation

Implementation Method 2

The condenser lens corresponds to the photosensitive surface of the infrared temperature sensor. Hence, the measurement angle or field of view (FOV) of the entire temperature sensing module can be reduced

Methodology Applied

Scientific EffectLens condensation: Lens

Data Source

PatentUS12326369B2Temperature sensing module and electronic device having the same

Publication Date: 2025.06.10 CHICONY ELECTRONICS CO LTD

AI summary

A temperature sensing module includes a hollow base, an infrared temperature sensor, and a condenser lens. The hollow base has a through hole, a first end, and a second end opposite to the first end. The first end has a first opening, the second end has a second end, and the through hole is in communication between the first opening and the second opening. The infrared temperature sensor is disposed in the through hole and adjacent to the second opening. The infrared temperature sensor includes a photosensitive surface, and the photosensitive surface faces the first opening. The condenser lens is disposed in the through hole and adjacent to the first opening. The condenser lens corresponds to the photosensitive surface of the infrared temperature sensor. An electronic device having the temperature sensing module is also provided.