Strip-Shaped Light Guide for Consistent Vehicle Interior Illumination

The patent introduces a light guide element as an intermediary between the light source and the interior surfaces. This light guide element has a large first surface that receives light from the emission element and a smaller second surface from which light is output. By using this intermediary structure, the illumination is decoupled from the reflective properties of the interior surfaces, providing consistent light intensity regardless of interior color or material properties.

The patent transitions from conventional point-source or linear illumination to a two-dimensional light diffusion approach. The light guide element's large first surface distributes light across an extended area, creating a planar illumination source that can uniformly illuminate interior surfaces. This dimensional change from point/line to area illumination reduces the impact of local surface properties on overall illumination consistency.

The light guide element serves as an intermediary that efficiently transfers light from the emission element to the interior space. The light guide has high optical transmission efficiency, minimizing absorption losses. By configuring the light guide with a large input surface area relative to the output surface, the system maximizes the proportion of emitted light that is effectively utilized for illumination rather than being absorbed by interior materials.

The patent optimizes the geometric parameters of the light guide element, specifically the ratio between the first surface area (light input) and the second surface area (light output). By making the first surface significantly larger than the second surface, the system increases light collection efficiency and reduces the number of reflections needed, thereby minimizing energy loss through absorption by interior materials.

The patent employs a two-dimensional light diffusion approach where the light guide element's large first surface distributes light uniformly across an extended area. This creates a diffuse illumination effect similar to indirect lighting, while the light guide itself can be positioned and configured flexibly to achieve various design goals. The combination of 2D diffusion with flexible positioning provides both pleasant illumination quality and design freedom.

The light guide element serves multiple functions: it acts as a light collector from the emission element, a light distributor across its large first surface, and a flexible positioning element that can be adapted to various design configurations. This multi-functionality allows the system to achieve both the diffuse quality of indirect illumination and the design flexibility associated with direct illumination approaches.

The light guide element integrates multiple functions into a single component: light collection, light distribution, and structural support. This integration simplifies the overall device design while maintaining the benefits of concealed light source arrangement. The light guide can be configured in various shapes and positions, providing design freedom without requiring complex separate components for light management.

The patent combines the light collection function and the light distribution function into a single light guide element. Instead of having separate components for concealing the light source and for distributing light, the light guide performs both functions, reducing device complexity while maintaining illumination quality and design flexibility.