Dual-Action Single-Key Mechanism for Camera Switches
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Solution Overview
Problem
Two-stage electrical switches in electronic devices face challenges in distinguishing between different stage activations due to complexity and difficulty in providing adequate tactile feedback, especially when combining functions like camera focusing and shutter activation in a single button.
Innovation Solution
The design incorporates a two-stage button with a resilient form and a dome switch, where a first force activates the outer switch for focusing and a second, greater force activates the inner switch for shutter capture, providing distinct tactile feedback through varying force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single push button with actuator is used to control both auto-focus and camera shutter, then the number of control keys is reduced, but it becomes difficult to align the actuator with the dome switch and provide distinct tactile feedback for different stages
Solution Approach 1:
The single push button is segmented into two distinct switches: an outer switch for auto-focus and an inner switch for camera shutter. This segmentation allows each switch to be independently aligned with its corresponding dome switch, eliminating alignment complexity while maintaining the space-saving benefit of a single button structure.
Solution Approach 2:
The inner switch is nested within the outer switch, creating a concentric arrangement where both switches share the same button structure. This nesting enables independent alignment of each switch with its respective dome switch while maintaining a compact single-button footprint.
2Adaptability or versatility
If a single push button with actuator is used to control both auto-focus and camera shutter, then the number of control keys is reduced, but distinct tactile feedback for different stage activations becomes difficult to provide
Solution Approach 1:
The segmented switch design creates distinct tactile feedback paths: the outer switch provides feedback for auto-focus activation, while the inner switch provides feedback for shutter capture. Users can clearly distinguish between stages through the separate mechanical responses of each switch.
Solution Approach 2:
Each switch is designed with locally optimized properties: the outer switch has specific contact point characteristics for focus activation, while the inner switch has different contact point characteristics for shutter activation. This local differentiation enhances tactile distinguishability.
3Adaptability or versatility
If traditional two-stage switch design is used, then focusing and shutter functions are combined, but difficulty in discerning between different stage activations occurs
Solution Approach 1:
By segmenting the switch into outer and inner components with separate contact points, the design enables clear detection of which stage is activated. The outer contact point detects focus activation, while the inner contact point detects shutter activation, eliminating ambiguity.
Solution Approach 2:
The resilient protrusion acts as an intermediary that transmits force differentially to the outer and inner switches. When force is applied, the resilient protrusion selectively activates the appropriate switch based on the depth and magnitude of compression, providing clear stage differentiation.
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 allows for clear differentiation between the focusing and shutter activation stages, enhancing user control and reducing interface complexity while maintaining a compact design suitable for mobile devices.
Implementation Method 1
a resilient form compressed by a key cap
Implementation Method 2
a dome switch positioned within an inner perimeter of the outer switch... a second downward force greater than the first downward force is received, the dome switch is then activated
Data Source
AI summary
A switch assembly is provided to actuate a pair of switches using a single key cap, e.g. for a camera that utilizes a first switch to activate an image focusing function and a second switch to activate a camera shutter. The switch assembly comprises an inner switch and an outer switch, wherein the outer switch partially or completely surrounds the perimeter of the inner switch. The outer switch comprises an upper conductive surface and a lower conductive surface that, when in contact, electrically couples two terminals for closing a circuit. The inner switch comprises an actuator and a dome switch. When the key cap receives a first downward force, only the outer switch becomes activated and a first electric circuit is completed. When the key cap receives a second downward force that is greater than the first force, the dome switch collapses and a second electric circuit is completed.