Vehicular Lamp Lens Cuts and Reflection Surface
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Solution Overview
Problem
Conventional vehicular lamps experience a decrease in luminous appearance due to attenuated light rays in certain areas of the front surface, resulting in non-uniform light output.
Innovation Solution
The vehicular lamp design incorporates a plate-like lens body with a front surface featuring alternating first and second light-outputting surfaces, each with specific inclination angles and diffusion angles, along with a reflection surface that directs and diffuses both direct and reflected light rays through lens cuts to enhance light distribution and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light rays travel through longer optical paths in the lens body, then light distribution coverage is improved, but light intensity is attenuated and luminous appearance decreases
Solution Approach 1:
The front surface of the lens body is segmented into multiple lens cuts (first lens cuts and second lens cuts) with different orientations and functions. This segmentation allows different light rays to be directed through different paths, ensuring that even areas with longer optical paths receive sufficient light intensity through alternative routing via the reflection surface.
Solution Approach 2:
A reflection surface is introduced as an intermediary element within the lens body. This reflection surface redirects light rays that would otherwise travel through long optical paths, effectively shortening their path length and maintaining light intensity. The reflection surface acts as a mediator between the light source and the front surface areas that previously experienced attenuation.
2Ease of manufacture
If the lens body is designed with simple linear surfaces, then manufacturing is simplified, but light output uniformity across the front surface deteriorates
Solution Approach 1:
The front surface is divided into multiple lens cuts with different orientations (first lens cuts extending in first direction, second lens cuts extending in second direction). This segmentation creates distinct light-outputting regions that can be independently optimized for uniform light distribution while maintaining compatibility with conventional manufacturing processes for each segment.
Solution Approach 2:
Different regions of the front surface are assigned different local properties through the lens cut configuration. Areas with longer optical paths are compensated by directing light through the reflection surface, while other areas use direct transmission. This local quality variation ensures uniform overall light output while allowing each region to be manufactured using standard techniques.
3Stability of the object's composition
If alternating first and second light-outputting surfaces are provided with different inclination angles, then light distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The front surface is segmented into alternating first and second light-outputting surfaces, where first lens cuts extend in a first direction and second lens cuts extend in a second direction. This segmentation creates a structured pattern that achieves uniform light distribution through systematic variation rather than complex randomization, keeping the device relatively simple.
Solution Approach 2:
The first and second light-outputting surfaces are designed with asymmetric inclination angles relative to the optical axis. This asymmetric configuration allows different light rays to be directed at appropriate angles for uniform distribution. The asymmetry is deliberately introduced only where needed to achieve uniformity, rather than making the entire lens complex.
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 ensures uniform light output from the front surface of the lens body, suppressing light loss and maintaining high luminous appearance, even in areas with longer optical paths, by diffusing light rays through strategically arranged lens cuts and reflection surfaces.
Implementation Method 1
a reflection surface 20d1 that internally reflects at least a part of the light rays from the light source 30 so as to be outputted through the second region 21A2
Implementation Method 2
the light rays emitted from the light source 30 enter the lens body 20 through the rear surface 20b, and are outputted through the front surface 20a while being controlled in terms of direction by a plurality of lens cuts provided to the front surface 20a
Data Source
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AI summary
There is provided a vehicular lamp (10) capable of outputting light rays uniformly from a front surface (20a) of a lens body (20) while being capable of suppressing the decrease in luminous appearance. The vehicular lamp (10) includes: a lens body (20) including a front surface (20a) and a rear surface (20b) on the opposite side thereof; and a light source (30) provided at the rear of the lens body (20) and emitting light rays that are to enter the lens body (20) through the rear surface (20b) and to be outputted through the front surface (20a). The front surface (20a) includes a plurality of lens cuts (21, 22) configured to control a diffusion angle of light rays from the light source (30) that are to be outputted through the front surface (20a). At least one lens cut (21, 22) of the plurality of lens cuts (21, 22) includes a first region (21A1, 22A1) and a second region (21A2, 22A2). The lens body (20) includes a reflection surface (20d1) that internally reflects at least a portion of light rays from the light source (30) that have entered the lens body (20) through the rear surface (20b) so as to be outputted through the second region (21A2, 22A2). The first region (21A1, 22A1) is a surface configured to control the diffusion angle of direct light rays (RayA1) from the light source (30) that have entered the lens body (20) through the rear surface (20b) to be outputted through the first region (21A1, 22A1), and the second region (21A2, 22A2) is a surface configured to control the diffusion angle of the reflected light rays (RayA2) from the reflection surface (20d1) which are to be outputted through the second region (21A2, 22A2).