Fingerprint Ignition Switch Lighting Layout Around Sensor Obstruction
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Solution Overview
Problem
The integration of a fingerprint recognition function in push-type ignition switches often obstructs the path of light sources, reducing the lighting effect of the push operation part.
Innovation Solution
A switch device design that includes a push operation part with a light transmitting portion, a control board with a fingerprint sensor and controller, flexible board for electrical connection, and strategically placed light sources and reflective/diffusion members to ensure effective illumination of the push operation part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint recognition function is integrated into the push-type ignition switch, then user authentication capability is improved, but the lighting effect of the push operation part is reduced due to obstruction of light paths
Solution Approach 1:
The patent positions light sources on both the front surface and rear surface of the control board, utilizing three-dimensional spatial arrangement to illuminate the push operation part from multiple directions. This multi-dimensional lighting approach ensures adequate illumination despite the fingerprint sensor occupying space within the switch assembly.
Solution Approach 2:
The patent introduces a light guide member as an intermediary component that transmits light from the light sources to the push operation part. The light guide member efficiently channels light around the fingerprint sensor integration, ensuring that the authentication functionality does not compromise the lighting effect.
2Adaptability or versatility
If multiple components are installed inside the case for fingerprint recognition, then authentication functionality is improved, but the complexity of the device structure increases
Solution Approach 1:
The patent integrates the fingerprint sensor with the control board by providing a recess in the control board that accommodates the fingerprint sensor. This merging of components reduces the number of separate parts and simplifies the overall device structure while maintaining authentication functionality.
Solution Approach 2:
The control board serves multiple functions: it controls the ignition switch operation, houses the fingerprint sensor for authentication, and provides structural support for the light guide member and light sources. This multi-functionality reduces the need for separate components, thereby reducing device complexity.
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
Prevents reduction in lighting effect by optimizing the arrangement of components, ensuring the push operation part remains adequately illuminated while integrating fingerprint recognition functionality.
Implementation Method 1
a plurality of light sources installed on opposite surfaces of the control board and closer to the push operation part than the controller to illuminate the light transmitting portion
Implementation Method 2
a diffusion member provided on a rear surface of the push operation part to diffuse the light emitted from the light source
Implementation Method 3
a reflective member provided to reflect the light emitted from the light source toward the diffusion member
Data Source
AI summary
Disclosed is a switch device including a push operation part having a light transmitting portion, a control board installed in a push operation direction of the push operation part, a fingerprint sensor provided on the push operation part to detect a fingerprint of a user pushing the push operation part, a controller provided on one surface of the control board to control the fingerprint sensor, a flexible board provided to electrically connect the fingerprint sensor and the controller, and a plurality of light sources installed on opposite surfaces of the control board and closer to the push operation part than the controller to illuminate the light transmitting portion.