Lamp Unit Image Forming Light Transmitter for Accurate Projection
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Solution Overview
Problem
Existing lamp units with projection lenses struggle to accurately form light distribution patterns in desired shapes due to inaccuracies in projecting images onto the rear side focal plane.
Innovation Solution
A lamp unit configuration featuring an image forming light transmitting body between the light source and projection lens, supported by a common lens holder, allows for precise control of light transmission and arrangement of light emitting elements to form desired light distribution patterns by projecting images onto the rear side focal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light emitting elements are mounted on a common substrate without individual positioning, then device complexity is reduced, but manufacturing precision of the projection image deteriorates
Solution Approach 1:
The light transmitting body is divided into multiple incident portions, each corresponding to a specific light emitting element. This segmentation allows each portion to independently control and direct light from its corresponding element, ensuring precise projection image formation while maintaining the simplicity of using a common substrate for mounting all elements.
Solution Approach 2:
The light transmitting body acts as an intermediary between the light emitting elements on the common substrate and the projection lens. It receives light from multiple elements and directs each through its incident portion to form an accurate projection image, thereby compensating for the lack of individual element positioning while maintaining projection precision.
2Manufacturing precision
If multiple separate holders are used for the projection lens and light transmitting body, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The holder is designed as a unified structure that simultaneously supports both the projection lens and the light transmitting body. This merging of support functions into a single component maintains precise positioning of both elements while reducing the total number of parts and simplifying the overall device structure.
Solution Approach 2:
The holder serves multiple functions: it supports the projection lens, supports the light transmitting body, and maintains the precise relative positioning between these components. This multi-functionality eliminates the need for separate holders while preserving positioning accuracy.
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 enhances the positional accuracy of light emitting elements and the image forming light transmitting body, enabling clear and accurate formation of light distribution patterns, including low and high beam patterns, with reduced component count and improved heat dissipation.
Implementation Method 1
An image forming light transmitting body configured to form a projection image by controlling transmission of light emitted from the light source is disposed between the light source and the projection lens
Implementation Method 2
the projection image is projected on an irradiation target surface in front of the unit by the projection lens to form a light distribution pattern as an inverted projected image thereof
Data Source
AI summary
A lamp unit includes a light source including a plurality of light emitting elements provided in a common substrate; a projection lens that projects light emitted from the light source toward a front of the lamp unit to form a required light distribution pattern; and a light-transmitting body disposed between the light source and the projection lens and that forms a projection image by controlling transmission of light emitted from the light source. The light transmitting body includes a plurality of incident portions that causes light emitted from each of the plurality of light emitting elements to be incident, and the light transmitting body and the substrate are supported by a lens holder that supports the projection lens.