Image Projector Lens Part with Inclined Side Regions
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Solution Overview
Problem
Conventional head-up display (HUD) devices for vehicles face issues with reduced visibility of projected images due to differences in light travel direction between the central and side regions, leading to increased complexity in assembly and optical axis alignment with multiple components.
Innovation Solution
An image projector design featuring a lighting substrate with integrated lens regions for central and side areas, where light from the side regions is inclined outward, simplifying assembly and optical axis adjustment while maintaining visibility across the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a magnifying mirror is used to increase image size, then the projected image size is increased, but light travel direction differences between central and side regions occur, reducing overall image visibility
Solution Approach 1:
The lens part is designed with different lens regions corresponding to different display regions. The first lens region corresponds to the central display region and the second lens region corresponds to the side display region, with each region having specific optical characteristics to control light radiation directions accordingly
Solution Approach 2:
The lens part is divided into multiple lens regions (first lens region and second lens region) that are integrally formed but have different optical functions. This segmentation allows independent optimization of light paths for central and side regions while maintaining a unified component structure
2Illumination intensity
If multiple display parts with separate light sources and lens optical system members are provided, then image visibility on both sides is improved, but the number of components increases and assembly work efficiency decreases
Solution Approach 1:
Multiple lens regions (first lens region and second lens region) that would traditionally be separate components are integrally formed into a single lens part. This merging reduces the number of components while maintaining the ability to control light paths for both central and side display regions
Solution Approach 2:
The single lens part serves multiple functions by incorporating different lens regions with different optical characteristics. The first lens region handles central region light paths while the second lens region handles side region light paths, making one component perform the work of multiple separate components
3Illumination intensity
If multiple display parts with separate light sources and lens optical system members are provided, then image visibility is improved, but positioning and optical axis alignment become difficult
Solution Approach 1:
By integrating multiple lens regions into a single lens part, the number of alignment interfaces is reduced. The integral formation ensures precise relative positioning of lens regions without requiring separate alignment procedures, thereby improving manufacturing precision
Solution Approach 2:
The lens regions are pre-positioned and precisely aligned during the integral formation process, establishing correct optical axes before assembly into the complete device. This preliminary positioning eliminates the need for complex alignment procedures during final assembly
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
The solution ensures easy assembly and optical axis adjustment while securing visibility on both sides of the image, reducing the number of components and improving the efficiency of the image projection process.
Implementation Method 1
a plurality of light-emitting elements mounted on a lighting substrate
Implementation Method 2
the emitted light is transmitted through the display surface as transmitted light
Implementation Method 3
a lens part that adjusts an optical axis of emitted light from the light-emitting elements
Implementation Method 4
radiation directions of light having passed through the second lens regions are more inclined toward laterally outer sides
Implementation Method 5
an image display part which displays an image on a display surface based on an image signal, and through the display surface of which the emitted light is transmitted
Implementation Method 6
allows reflected light to be visually recognized
Data Source
AI summary
An image projector is provided for which assembly work and optical axis adjustment are easy while visibility at both sides of an image is secured. This image projector includes a lighting substrate, a lens part that adjusts an optical axis of emitted light from light-emitting elements, and an image display part which displays an image on a display surface and through which the emitted light is transmitted. The display surface of the image display part has a central region and side regions located on both sides. In the lens part, a first lens region corresponding to the central region and second lens regions corresponding to the side regions are integrally formed. Radiation directions of light having passed through the second lens regions are more inclined toward laterally outer sides than a radiation direction of light having passed through the first lens region.