Temperature Detecting Element Multi-Region Lens Design

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Solution Overview

Problem

Infrared sensors with plano-convex lenses have insufficient light-collecting power, making it difficult to produce high light-collecting power without complicating lens machining, and the sensitivity of these sensors can be uneven due to diagonal infrared light incidence.

Innovation Solution

A temperature detecting element with a configuration that includes a first light-collecting portion and a second light-collecting portion on a base, allowing infrared light to be efficiently collected and directed to a sensor portion, ensuring consistent sensitivity regardless of the sensor's position, and enabling the use of a base that covers the temperature detecting element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a plano-convex lens is used in the infrared sensor, then the structure is simple and easy to manufacture, but the light-collecting power is insufficient

Engineering Contradiction:
Improvelens manufacturing easeVSAvoidlight-collecting power
Core Design Contradiction:
Ease of manufactureVSMeasurement precision

Solution Approach 1:

The lens is divided into multiple regions with different curvature radii: a first region with a first curvature radius and a second region with a second curvature radius. This segmentation allows different parts of the lens to serve different optical functions, improving light collection efficiency while maintaining manufacturability through standardized multi-region molding techniques.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are assigned different local optical properties through varying curvature radii. The first region has optimized curvature for specific light collection angles, while the second region has different curvature for complementary light collection, creating local quality variations that enhance overall light-collecting power without complicating the global lens structure.

Inventive Principle:
Principle #3Local quality

2Measurement precision

If the radius of curvature of the plano-convex lens is reduced to increase light-collecting power, then light-collecting power increases, but lens machining becomes difficult

Engineering Contradiction:
Improvelight-collecting powerVSAvoidlens machining difficulty
Core Design Contradiction:
Measurement precisionVSEase of manufacture

Solution Approach 1:

Instead of using a single small radius of curvature throughout the lens, the lens is segmented into regions with different curvature radii. This allows the lens to achieve high light-collecting power through regional optimization rather than requiring the entire lens to have a small radius, thereby reducing machining difficulty while maintaining optical performance.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The curvature radius parameter is changed across different regions of the lens rather than being uniform. By varying the curvature radius from the first region to the second region, the lens achieves optimized light collection without requiring the extreme small radius that would make machining difficult, thus changing the parameter distribution to resolve the contradiction.

Inventive Principle:
Principle #35Parameter changes

3Device complexity

If a single light-collecting lens is used, then the structure is simple, but sensitivity becomes uneven due to diagonal infrared light incidence

Engineering Contradiction:
Improvelens structure complexityVSAvoidsensitivity uniformity
Core Design Contradiction:
Device complexityVSMeasurement precision

Solution Approach 1:

The single lens is segmented into multiple functional regions with different curvature characteristics. The first region and second region each handle different incident light angles, with the first region optimized for certain angles and the second region for others, including diagonal incidence. This segmentation maintains relatively simple overall structure while achieving uniform sensitivity across different light incidence directions.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Different regions of the lens are given different local curvature properties to address specific directional light collection needs. The local quality variation ensures that diagonal infrared light incidence is properly handled by the appropriate region, maintaining uniform sensitivity across the sensor while keeping the overall lens structure relatively simple and integrated.

Inventive Principle:
Principle #3Local quality

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 enhances light-collecting power and maintains consistent sensitivity across the temperature detecting element array, simplifying the structure and improving detection accuracy.

Implementation Method 1

a light-collecting portion constituted by a first light-collecting portion to which infrared light is incident and a second light-collecting portion to which infrared light having been exited from the first light-collecting portion is incident

Methodology Applied
Scientific EffectLight collection and focusing: Lens

Implementation Method 2

a sensor portion to which infrared light having been exited from the second light-collecting portion is incident

Methodology Applied
Scientific EffectInfrared detection: Photoelectric Effect

Data Source

PatentUS12061121B2Temperature detecting element and imaging apparatus
Publication Date: 2024.08.13 SONY SEMICON SOLUTIONS CORP
  • US12061121B2 patent drawing
  • US12061121B2 patent drawing
  • US12061121B2 patent drawing

AI summary

There is provided a temperature detecting element that includes a light-collecting portion and a sensor portion. The light collecting portion is constituted by a first light-collecting portion to which infrared light is incident and a second light-collecting portion to which infrared light having been exited from the first light-collecting portion is incident. The sensor portion is a portion to which infrared light having been exited from the second light-collecting portion is incident. At least one of the first light-collecting portion and the second light-collecting portion is provided on a base that covers the temperature detecting element.