Rotating Flashlight Selector with Magnetic Position Sensing

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Solution Overview

Problem

Existing flashlights require sequential selection of light intensity and color, leading to unintended light production and accidental activation due to push-button sequencers, which is inconvenient and prone to errors.

Innovation Solution

A flashlight with a rotatable selector ring that allows independent selection of light sources and colors, featuring a pushbutton for energization conditions, providing visual and tactile confirmation, and a design that prevents accidental activation through a biased selector ring and baffle mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a pushbutton sequencer is used for selecting light sources and colors, then the device structure is simple, but accidental or inadvertent sequencing occurs leading to unintended light production

Engineering Contradiction:

Improveselector structureVSAvoidselection accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A magnetic field acts as an intermediary between the rotary selector and the sensor array. Magnets mounted on the rotary selector interact with radial magnetic field sensors without mechanical contact, eliminating accidental activation while maintaining selection functionality. This intermediary magnetic coupling resolves the contradiction by providing reliable, intentional-only selection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mechanical pushbutton sequencer is replaced with a rotary selector combined with magnetic field sensing. Instead of mechanical pushbuttons that can be accidentally pressed, the system uses non-contact magnetic field interaction between magnets on the rotary selector and radial sensors, eliminating accidental activation while maintaining selection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If a pushbutton sequencer is used for selecting light sources and colors, then the device structure is simple, but the user must sequence through states in a fixed uni-directional sequence leading to undesired light production

Engineering Contradiction:

Improveselector structureVSAvoidselection flexibility

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Instead of a linear pushbutton sequencer that forces uni-directional selection, the invention inverts the approach by using a rotary selector with radial sensors. This allows the user to rotate to any desired position directly without sequencing through intermediate states, eliminating undesired light production while maintaining simple device structure.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The selection mechanism transitions from a one-dimensional linear pushbutton sequence to a two-dimensional rotary interface with radial sensor arrangement. This dimensional change enables direct selection of any state by rotating to the corresponding angular position, providing selection flexibility without increasing device complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If a rotary selector with radial magnetic field sensors is used, then accidental activation is prevented, but the device complexity increases

Engineering Contradiction:

Improveselection accuracyVSAvoidselector structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The rotary selector serves multiple functions: it provides visual indication of selected state through its angular position, enables selection through rotational movement, and maintains the chosen state through magnetic field interaction. This multi-functionality reduces the need for additional components, offsetting the increased complexity with functional consolidation.

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 intuitive and accurate selection of light modes with reduced accidental activation, allowing users to choose desired light intensity and color without sequential errors, suitable for various applications including night vision and signaling.

Implementation Method 1

a first and second pairs each including a respective photo-transmitter and a photo-receiver positioned for optical communication therebetween; a baffle rotatable with the rotatable selector to interrupt optical communication between the photo-transmitter and the photo-receiver

Methodology Applied

Scientific EffectOptical communication and interruption: Absorption (EM radiation)

Data Source

PatentEP2057497B1Light including an electro-optical "photonic" selector switch

Publication Date: 2017.07.19 STREAMLIGHT INC

Figure 1A~1B
Figure 1C~1D
Figure 2

AI summary

A light (10) and/or selector (300) may comprise a selector (300) rotatable and axially movable in a housing (20, 120) with a member (320) rotatable therewith for indicating rotational position. A projection (314) engages one or more recesses (126) when the rotatable selector (300) is proximate the housing (20, 120) and does not engage the recesses (126) when the rotatable selector (300) is distal the housing (20, 120). A spring (304) biases the rotatable selector (300) towards the housing (20, 120) so that the rotatable selector (300) must be pulled away from the housing (20, 120) against the bias of the spring (304) to disengage the projection (314) from the one or more recesses (126) and to rotate.