Rotatable Knob Sliding Switch for Sealed Lamp Dimming

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Solution Overview

Problem

Existing dial color-matching lamps suffer from poor sealing performance due to slidable rotating sleeves or dial sheets, leading to water vapor ingress and reduced service life, and require expensive dial switches.

Innovation Solution

A knob dimming lamp design featuring a dimming knob that rotates to drive a slider on a substrate, allowing a conductive sheet to engage different contacts for adjusting illumination parameters, with a simplified control structure and improved sealing through a fixed position relative to the housing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a slidable rotating sleeve or dial sheet is provided on the housing to drive the dial switch, then the dial gear-shifting function is achieved, but the sealing performance deteriorates and water vapor can easily enter the lamp

Engineering Contradiction:

Improvedial gear-shifting functionVSAvoidsealing performance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent extracts the dial switch from the housing structure and replaces it with a knob assembly that rotates independently on the housing surface. The dial switch is removed entirely and replaced by a simplified structure where the knob directly drives the light-emitting assembly through rotational movement, eliminating the need for slidable components that compromise sealing.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of having a slidable component move along the housing surface to control the dial switch, the patent inverts the approach by having the knob rotate on the housing surface and directly drive the light-emitting assembly. The control mechanism is inverted from linear sliding motion to rotational motion, maintaining sealing while achieving the same gear-shifting function.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If a PCB with dial switch is added below the light source bead board, then the dial control function is achieved, but the device complexity and production cost increase

Engineering Contradiction:

Improvedial control functionVSAvoidcontrol structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent merges the dial switch function with the knob assembly into a single integrated structure. The knob directly drives the light-emitting assembly without requiring a separate PCB-mounted dial switch. The control function and the mechanical assembly are combined, eliminating the need for additional PCB components and reducing overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The knob assembly serves multiple functions: it acts as both the control interface and the driving mechanism for the light-emitting assembly. The same rotational movement that controls the gear-shifting also directly drives the light emission, making the component universal and eliminating the need for separate control circuitry on the PCB.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If a PCB with dial switch is added below the light source bead board, then the dial control function is achieved, but the production cost increases

Engineering Contradiction:

Improvedial control functionVSAvoidproduction cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent replaces the expensive PCB-mounted dial switch with a simpler, cheaper knob assembly that can be manufactured and assembled more economically. The simplified structure requires fewer precision components and less complex assembly processes, reducing production costs while maintaining the dial control function.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Ease of operation

If a rotating sleeve is provided on the housing surface to drive the dial switch, then the dial gear-shifting is achieved, but the sealing performance deteriorates

Engineering Contradiction:

Improvedial gear-shiftingVSAvoidwater vapor ingress

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent removes the rotating sleeve component entirely and replaces it with a knob that rotates directly on the housing surface. By extracting the slidable rotating sleeve that created sealing issues, the design eliminates the pathway for water vapor ingress while preserving the dial gear-shifting function through the simplified knob mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent inverts the control mechanism from a slidable rotating sleeve that moves along the housing surface to a knob that rotates on the housing surface. This inversion changes the motion from linear sliding (which compromises sealing) to rotational motion (which maintains sealing), preventing water vapor ingress while achieving the same control function.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12584620B2Lamp with rotatable knob operated sliding switch

Publication Date: 2026.03.24 FOSHAN ELECTRICAL & LIGHTING

AI summary

The lamp includes a housing, a light-emitting assembly disposed in the housing, a switching assembly having a knob, a substrate with a plurality of contacts, a slider, and a conductive sheet disposed on the slider. The knob is coupled to the housing and configured for rotation relative to the housing. The slider is disposed on the substrate and configured to slide along a predetermined trajectory relative to the substrate driven by rotation of the knob. The conductive sheet is configured to slide into communication with different ones of the plurality of contacts such that illumination parameters of the lamp are adjusted.