Vehicle Lighting Device Lens Attachment Mechanism
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Solution Overview
Problem
Existing vehicle lighting devices face challenges in securely attaching lenses to housings without causing stress or visibility issues with fastening mechanisms, which affects appearance quality and reliability.
Innovation Solution
A lighting device design featuring an engaging part on one side of the lens or housing and an engaged part on the other, allowing the lens to be fixed at a predetermined angle with a fastening screw that abuts an internal locking plate, preventing disengagement and minimizing stress on the lens, while being inconspicuous and efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fastening screw is used to attach the lens to the housing, then the lens can be securely fixed, but the fastening mechanism becomes visible and affects appearance quality
Solution Approach 1:
The patent extracts the fastening function from the visible exterior by providing a through-hole in the housing that allows the fastening screw to be inserted from the rear side. The screw head is received in a recessed portion of the housing, making it invisible from the front viewing side while still providing secure attachment of the lens to the housing.
2Reliability
If the lens is tightly fixed to the housing, then attachment reliability improves, but stress on the lens increases
Solution Approach 1:
The patent segments the attachment function into two distinct mechanisms: a locking mechanism (engaging protrusion and engaging groove) that provides attachment reliability, and a fastening mechanism (fastening screw) that secures the connection without applying stress to the lens. The locking mechanism handles the positioning and initial attachment, while the fastening screw only needs to prevent detachment, distributing the functional requirements and reducing overall stress on the lens.
3Ease of operation
If the lens can be easily detached for maintenance, then ease of operation improves, but attachment reliability may be compromised
Solution Approach 1:
The patent divides the attachment system into a reversible locking mechanism and a secure fastening mechanism. The locking mechanism with engaging protrusion and groove allows for easy engagement and detachment when needed, while the fastening screw provides additional security that maintains attachment reliability. This segmentation enables the lens to be easily detached for maintenance while ensuring it remains securely attached during normal operation.
Data Source
AI summary
A lighting device for a vehicle includes a lens, a housing, an engaging part, and an engaged part. The engaging part and the engaged part are configured to be a state in which the lens is fixed in a predetermined position by turning the lens by a predetermined angle with respect to the housing after the lens and the housing are fitted in a direction of an optical axis of the lens. An inside of the lens abuts, by screwing the fastening member to the housing when the lens is fixed in the predetermined position, on an end of the fastening member so that turning of the lens is disenabled even if it is tried to turn the lens in a direction in which the lens is disengaged from the housing.