Rotatable Lantern Housing with Axis-Aligned Motion Sensor
Solution Overview
Problem
Existing lighting fixtures with motion sensors face difficulties in changing orientation without altering the field of view, making it troublesome to rearrange their position without removing wiring connections or hardware.
Innovation Solution
A lamp assembly with a rotatable housing and a motion sensor assembly, including a pyroelectric infrared sensor covered by a Fresnel lens, allows for multiple orientations without affecting the sensor's field of view, using a two-piece rotating bracket and a modular electronic control assembly to maintain optimal motion detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fixture is mounted in a plurality of orientations, then the adaptability of the fixture is improved, but the field of view of the motion sensor is altered
Solution Approach 1:
The lamp housing is made rotatable around a central axis, allowing dynamic reorientation of the fixture. The motion sensor assembly is positioned at the axis of rotation, enabling the housing to rotate while the sensor maintains a consistent field of view relative to the rotation axis, thus resolving the contradiction between mounting flexibility and detection performance
Solution Approach 2:
The motion sensor assembly is positioned in a plane perpendicular to the axis of rotation, allowing the housing to rotate in one dimension (azimuthal angle) while the sensor maintains its field of view in another dimension (radial direction), effectively decoupling the rotation from the sensor's detection orientation
2Adaptability or versatility
If the fixture orientation is changed, then the adaptability is improved, but the field of view of the motion sensor is undesirably altered
Solution Approach 1:
The rotatable lamp housing allows dynamic adjustment of the fixture orientation while the motion sensor assembly, positioned at the rotation axis, maintains a stable field of view. This dynamic design enables reorientation without compromising detection accuracy, as the sensor remains fixed relative to the rotation center
Solution Approach 2:
The axis of rotation acts as an intermediary element that separates the housing rotation from the sensor orientation. The motion sensor assembly is mounted on this intermediary axis, allowing the housing to rotate independently while the sensor maintains its field of view through the intermediary rotation mechanism
3Stability of the object's composition
If the fixture is mounted securely, then the stability is improved, but the ease of reorientation is reduced
Solution Approach 1:
The mounting system incorporates a rotatable bracket with a two-piece plate construction that allows secure mounting while enabling easy rotation. The plates are rotatable with respect to each other about a central aperture, providing stable securing when mounted but allowing simple reorientation by rotating the plates, thus resolving the contradiction between security and ease of operation
Solution Approach 2:
The rotating bracket is divided into two separate plates that can rotate independently relative to each other. This segmentation allows the mounting system to provide secure attachment through the bracket structure while enabling easy reorientation by simply rotating the plates about the central aperture without requiring disassembly
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 the lighting fixture to be mounted in various orientations without compromising the motion sensor's performance, protecting control switches from moisture and allowing easy reorientation without reconfiguring the sensor.
Implementation Method 1
a motion sensor, for example a pyroelectric infrared sensor (PIR)
Implementation Method 2
a motion sensor, for example a pyroelectric infrared sensor (PIR) that is covered by a Fresnel lens to focus impinging infrared energy on the PIR sensor
Data Source
AI summary
A lighting fixture capable of mounting in a plurality of orientations comprises a wall mount assembly having a front canopy rotatably secured to a rear canopy and a lamp housing assembly capable of a plurality of orientations secured to said rotatable front canopy and capable of rotation therewith. The lamp housing assembly may further include a motion sensor integral thereto whereby the rotation of the housing assembly does not affect the performance of the motion sensor.