Imaging Device Illumination Control for Light-Emitting Element Lifespan
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Solution Overview
Problem
Existing imaging devices using light-emitting elements for vein pattern imaging suffer from rapid deterioration due to continuous light emission, which affects the longevity and efficiency of the illumination system.
Innovation Solution
The implementation of a dual-light-emitting element system with simultaneously controlled first and second light-emitting elements in a transmission region and individually controlled elements in a non-transmission region, allowing for selective illumination and reduced emission periods to prolong element lifespan and enhance illumination coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light-emitting elements are continuously illuminated to image the entire subject area, then illumination coverage is improved, but the light-emitting elements deteriorate rapidly
Solution Approach 1:
The illumination portion is divided into multiple light-emitting elements arranged in a matrix, with each element independently controllable. This segmentation allows selective activation of specific elements based on imaging requirements, rather than continuous illumination of all elements, thereby extending their operational lifespan while maintaining adequate coverage.
Solution Approach 2:
The light-emitting elements are activated periodically and intermittently rather than continuously. The control portion selectively turns on specific light-emitting elements only when needed for imaging, creating periodic illumination cycles that reduce cumulative exposure and deterioration of the elements while still providing sufficient illumination coverage over time.
2Adaptability or versatility
If individual light-emitting elements are used to illuminate both fixed and variable regions, then illumination flexibility is improved, but element deterioration accelerates
Solution Approach 1:
The light-emitting elements are segmented into two functional groups: those for illuminating fixed regions and those for illuminating variable regions. This segmentation allows each group to be independently controlled, enabling the fixed region illuminators to operate less frequently while the variable region illuminators handle dynamic imaging needs, thereby distributing wear and extending overall system lifespan.
Solution Approach 2:
The control portion implements periodic activation patterns where individual light-emitting elements are turned on only when their specific imaging function is required. This intermittent operation reduces cumulative stress on each element compared to continuous operation, while maintaining the flexibility to adapt to different imaging scenarios.
3Device complexity
If only one set of simultaneous light-emitting elements is used, then device complexity is reduced, but element deterioration occurs faster
Solution Approach 1:
The simultaneous light-emitting elements are divided into multiple sets (first set and second set) that can be selectively activated. This segmentation allows the system to alternate between different sets, distributing the cumulative illumination load across multiple elements and extending the operational lifespan of each individual element while maintaining adequate illumination capability.
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 effectively suppresses the deterioration of light-emitting elements by alternating their usage and ensures uniform illumination of a wide area, improving the imaging device's performance and longevity.
Implementation Method 1
a light-emitting element receives light reflected from a subject when the subject is illuminated by a light-emitting element containing an organic EL material
Implementation Method 2
an illumination portion which includes a light-transmitting transmission region and a light-shielding non-transmission region
Data Source
AI summary
An imaging device includes: an illumination portion which includes a light-transmitting transmission region and a light-shielding non-transmission region, has a plurality of simultaneous light-emitting elements that have a light-transmitting property, include a plurality of first light-emitting elements in which turning-on and turning-off are simultaneously controlled and a plurality of second light-emitting elements in which turning-on and turning-off are simultaneously controlled, and are provided in the transmission region, and has a plurality of individual light-emitting elements in which turning-on and turning-off are individually controlled and which are provided in the non-transmission region; an imaging portion which receives light that is reflected from a subject illuminated by the illumination portion and is transmitted through the transmission region; and a switching portion which selectively turns on the plurality of first light-emitting elements and the plurality of second light-emitting elements in a first period in which the plurality of individual light-emitting elements are turned off, and turns off the plurality of simultaneous light-emitting elements in a second period in which the plurality of individual light-emitting elements are turned on.