Headlight Light Source with Displaced Emitter and Concave Mirror
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Solution Overview
Problem
Existing vehicle-mounted headlights face challenges in downsizing light sources while maintaining optical characteristics, as shortening the focal length of projection lenses with a single convex lens is difficult due to large curvature and aberration issues, and adding an auxiliary convex lens increases costs and parts.
Innovation Solution
A light source configuration featuring a light emitting element and a light guide member with a concave mirror reflection surface, where the light emitting element is displaced from the optical axis of a convex projection lens, allowing the optical center of the reflection surface to be between the projection lens and its focal point, reducing focal length without increasing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the focal length of a projection lens is shortened by using a single convex lens with large curvature, then the focal length is reduced, but manufacturing precision deteriorates due to difficulty in forming the lens and increased aberration
Solution Approach 1:
The patent merges the reflection function and projection lens function into a single integrated component. The light guide member combines a concave mirror reflection surface with a projection lens, eliminating the need for separate auxiliary lenses while achieving the desired focal length reduction without compromising manufacturing precision or optical quality
2Length of stationary object
If an auxiliary convex lens is added to shorten the focal length, then the focal length is reduced, but device complexity increases due to additional parts
Solution Approach 1:
The patent combines multiple optical functions (light reflection and projection) into a single integrated light guide member, eliminating the need for auxiliary convex lenses and reducing the overall number of parts in the headlight assembly
Solution Approach 2:
The light guide member serves multiple functions simultaneously: it acts as both a light guide, a reflection surface (concave mirror), and a projection lens, thereby reducing device complexity while maintaining the required optical performance
3Volume of moving object
If the focal length of a projection lens is shortened, then downsizing is achieved, but manufacturing precision deteriorates due to large curvature requirements
Solution Approach 1:
The patent integrates the reflection surface and projection lens into one component, allowing the projection lens to maintain optimal curvature and manufacturing precision while the combined system achieves the reduced focal length needed for downsizing
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 enables the shortening of focal length without adding auxiliary lenses, improving lens forming accuracy and reducing aberration, while maintaining effective light distribution and utilization efficiency.
Implementation Method 1
a reflection surface part (32) reflecting light emitted by the light emitting element (1)
Implementation Method 2
a projection lens part (33) projecting the light reflected by the reflection surface part (32) onto an area ahead of a moving object
Data Source
AI summary
In a light source for headlight, the light emitting element is arranged to be displaced from an optical axis of the projection lens part. The reflection surface part is in a shape of a concave mirror having an optical axis and one focal point on the optical axis. An optical center which is an intersection of the reflection surface part and the optical axis of the reflection surface part is arranged on the optical axis of the projection lens part and between the projection lens part and a focal point of the projection lens part. The optical axis of the reflection surface part is oriented in a direction passing a position between a central part of a light emitting surface of the light emitting element and a central part of the projection lens part.