Iris Authentication Apparatus Using Bent Flexible Board
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in miniaturizing iris authentication apparatus for small-sized electronic devices is to maintain a wide iris authentication space without causing the red-eye phenomenon and ensuring stable mounting, as conventional designs face issues with component spacing and flexibility in confined areas.
Innovation Solution
The iris authentication apparatus employs a plate-shaped member connected to a circuit mounting unit with a bent flexible board, positioning the iris illuminating LED at an angle to maximize the authentication space while minimizing repulsive forces, allowing for stable fixation within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the iris photographing camera and iris illuminating LED are brought close to each other to maximize the iris authentication space, then the authentication space is widened, but a red-eye phenomenon occurs and the iris image cannot be accurately extracted
Solution Approach 1:
The patent angles the iris illuminating LED relative to the iris photographing camera, transitioning from a planar arrangement to a three-dimensional configuration. This angular arrangement allows the illumination light to strike the iris at an oblique angle, preventing direct reflection into the camera lens while still illuminating the iris effectively, thus eliminating the red-eye phenomenon while maintaining authentication space.
Solution Approach 2:
The patent creates an asymmetric arrangement where the iris illuminating LED is positioned at a specific angle relative to the iris photographing camera rather than symmetrically opposite or adjacent. This asymmetric positioning optimizes the lighting geometry to prevent direct light reflection into the camera while ensuring adequate iris illumination for authentication.
2Object-affected harmful factors
If the distance between the iris photographing camera and iris illuminating LED is increased to prevent red-eye, then the red-eye phenomenon is avoided, but the illumination range is deviated and the iris authentication space is reduced
Solution Approach 1:
Instead of increasing the linear distance between components, the patent utilizes the angular dimension by positioning the LED at an incline relative to the camera. This three-dimensional arrangement allows the components to remain close in terms of linear distance while achieving the light path separation necessary to prevent red-eye, thereby maintaining a compact authentication space.
3Area of stationary object
If the iris illuminating LED is angled to increase the iris authentication space, then the authentication space is widened, but multiple flexible boards are required which makes it difficult to ensure mounting space in small-sized devices
Solution Approach 1:
The patent combines the iris illuminating LED and iris photographing camera onto a single flexible board, eliminating the need for separate flexible boards for each component. This integration maintains the angled positioning necessary for wide authentication space while reducing the overall component count and simplifying the mounting structure for small-sized electronic devices.
Solution Approach 2:
The single flexible board serves multiple functions by accommodating both the iris illuminating LED and iris photographing camera, as well as providing structural support and electrical connections for both components. This multi-functional design reduces the number of separate mounting substrates required.
4Device complexity
If the same flexible board is used for the iris illuminating LED and other adjacent apparatus, then the device complexity is reduced, but the LED protrudes upward and is difficult to house in the device
Solution Approach 1:
The patent utilizes the vertical dimension by angling the iris illuminating LED relative to the flexible board surface. This angular mounting allows the LED to be positioned such that it does not protrude upward from the device surface, while still achieving the necessary illumination angle for wide authentication space and preventing red-eye phenomenon.
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 ensures a wider iris authentication space without red-eye issues and allows for stable mounting of the iris illuminating LED within small-sized electronic devices, enhancing both functionality and convenience.
Implementation Method 1
an iris illuminating light emitting diode (LED)
Implementation Method 2
receiving its reflected light by the iris photographing camera
Data Source
AI summary
An upper flexible board mounts a circuit. A lower flexible board is in a plate shape larger than a circuit mounting unit, is connected to the upper flexible board by a connecting part, is bent so that the connecting part faces a face opposite to a mounting face of the circuit of the upper flexible board, and includes an area from a bend that is generated by bending an area that does not overlap with the upper flexible board including a second end different from the connecting part to the second end. An iris illuminating LED is disposed on the same side as the upper flexible board in the area. An iris photographing camera is disposed at a position separated from the iris illuminating LED by a certain distance or more and acquires an image of an iris that has received light emission from the iris illuminating LED.