Keypad Bezel Illumination via Reflective Diffusion
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Solution Overview
Problem
Existing access control systems for containers like gun safes lack effective illumination of keypads, making it difficult for users to enter the correct code, especially in low-light conditions, which can hinder secure access.
Innovation Solution
A keypad with a light-emitting diode (LED) integrated into the printed circuit board, protected from physical damage and electrostatic discharge, and a reflective bezel that diffuses light to evenly illuminate the buttons, activated either by a dedicated light button or motion/proximity sensors, ensuring brief illumination for code entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is added to illuminate the keypad, then visibility and usability in dark environments is improved, but device complexity and potential points of failure increase
Solution Approach 1:
The patent combines the light source (LED) directly with the printed circuit board of the keypad, integrating the illumination function into the existing keypad structure. This eliminates the need for separate lighting components and reduces overall system complexity while providing effective keypad illumination.
Solution Approach 2:
The lighting system is designed to serve multiple functions: illuminating the keypad for code entry, providing visual feedback during the unlocking process, and potentially indicating system status. This multi-functionality justifies the added complexity by delivering multiple benefits from a single integrated system.
2Ease of operation
If the LED is activated continuously to provide illumination, then usability is improved, but energy consumption increases
Solution Approach 1:
The LED is activated periodically only when needed - specifically when a button is pressed on the keypad. The system detects button presses and triggers the LED to illuminate for the duration of the code entry sequence, then turns off. This periodic activation significantly reduces energy consumption compared to continuous operation while maintaining usability during actual use.
Solution Approach 2:
The lighting system automatically activates in response to user interaction with the keypad. When a button is pressed, the system self-activates the LED without requiring separate user action, providing illumination exactly when and where it is needed for code entry.
3Illumination intensity
If the LED is made bright to ensure visibility, then illumination effectiveness is improved, but the LED becomes more susceptible to damage from electrostatic discharge
Solution Approach 1:
The patent implements protective measures against electrostatic discharge before the LED can be damaged. A protective circuit or coating is applied to the LED and surrounding circuitry to dissipate or block electrostatic charges. This pre-protection allows the LED to operate at higher brightness levels without being vulnerable to ESD damage, as the protective layer absorbs or redirects harmful electrical charges.
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
Provides sufficient and even lighting for the keypad buttons, enhancing usability and security by allowing users to enter the correct code efficiently, even in dark environments, while protecting the LED from damage and electrostatic interference.
Implementation Method 1
A keypad with a light-emitting diode (LED) integrated into the printed circuit board
Implementation Method 2
a reflective bezel that diffuses light to evenly illuminate the buttons
Data Source
AI summary
A lock assembly for securing a container having an interior region is provided. In one illustrative embodiment, the lock assembly includes a keypad having a plurality of buttons on a first surface of the keypad, a light-emitting diode, and a bezel surrounding at least a portion of the keypad. The bezel includes a reflective surface positioned to reflect a light from the light-emitting diode, the reflected light illuminating the plurality of buttons.