Person Detector Lens Cap Light Guide Design
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Solution Overview
Problem
Existing detectors for detecting presence and movement in a large area are complex, costly, and have an unattractive design that disrupts aesthetics, with sensor elements not optimally arranged, and actuating elements difficult to operate.
Innovation Solution
A compact detector design with a modular system for direct or box installation, featuring a concealed sensor device and actuating elements, using a transparent lens cap with a light guide for optimal ambient light detection and a design ring for a clean appearance, ensuring reliable detection without stray light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large detection area is provided with multiple sensor elements, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The detection area is divided into multiple segments using a lens cap with segmented lens elements. Each lens segment directs infrared radiation from a specific spatial zone to corresponding sensor elements, enabling reliable detection across a large area while maintaining a compact device structure.
Solution Approach 2:
The patent uses optical lens segments arranged in a specific geometric pattern to expand the detection area in multiple spatial dimensions. By positioning sensor elements and lens segments in three-dimensional space, the system achieves wide coverage without proportionally increasing device volume or complexity.
2Adaptability or versatility
If control devices and operating elements are added for user settings, then functionality is improved, but ease of operation deteriorates due to difficult access
Solution Approach 1:
Operating elements and control devices are integrated into the housing structure in a nested arrangement. Adjustment elements are positioned within recesses or integrated into the housing contours, allowing user access while maintaining a compact, aesthetically pleasing external form.
3Measurement precision
If sensor elements are exposed for optimal detection, then detection precision is improved, but design attractiveness deteriorates
Solution Approach 1:
A lens cap with transparent or translucent material is used to cover the sensor elements. The lens cap integrates optical functionality with aesthetic coverage, allowing light transmission for detection while providing a smooth, attractive external surface that conceals the internal sensor arrangement.
Solution Approach 2:
The lens cap serves multiple functions simultaneously: it protects the sensor elements, directs infrared radiation through segmented optical paths, and provides an aesthetically pleasing external cover. This multi-functionality eliminates the need for separate protective and cosmetic components.
4Measurement precision
If a transparent lens cap is used for ambient light detection, then light detection is improved, but stray light exposure increases
Solution Approach 1:
The lens cap features locally differentiated optical properties with specific transparent or translucent regions positioned to allow ambient light access to the light sensor, while other regions remain opaque or have different transmission characteristics to block stray light from reaching infrared sensors. This spatial variation in optical quality enables selective light transmission.
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 provides a reliable, cost-effective, and aesthetically pleasing detection system with a large coverage area, allowing for easy user settings and concealed actuating elements, ensuring high functional reliability and attractive finish.
Implementation Method 1
a sensor arrangement having at least one first sensor element for detecting infrared radiation
Implementation Method 2
a sensor device having at least one second sensor element for detecting the ambient brightness
Implementation Method 3
The second sensor element 4 of the sensor device is assigned on the one hand a light guide 14
Data Source
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AI summary
A detector for detecting the presence and/or movement of persons within its detection range is proposed. The detector's housing is designed to accommodate a circuit board assembly equipped with a sensor assembly comprising several first sensor elements for detecting infrared radiation, a sensor assembly comprising at least one second sensor element for detecting ambient brightness, at least one user-adjustable actuator, at least one microcontroller, and other components necessary for its operation. A lens cap with multiple lens segments is provided on the detector's housing. For the purpose of creating a detector,The housing consists of a lower housing part and an upper housing part fitted with a lens cap, and the circuit board assembly includes a holder that accommodates both the first sensor elements of the sensor assembly and the second sensor element of the sensor assembly. The second sensor element of the sensor assembly is connected to a light guide arranged in the holder, which is also directed towards the inside of the lens cap. The lens cap has an optical design in the area of the light guide that is particularly suitable for detecting the brightness of ambient light.