Vehicle Target Detection Light Diffusion for Range and Sensitivity
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Solution Overview
Problem
Existing target detecting devices face challenges in extending the detection range for short-distance targets while improving detection sensitivity for long-distance targets, as increasing the number of light emitting elements or light-emitting power is costly and limited by current technology, and diffusing measuring light reduces sensitivity for long-distance targets.
Innovation Solution
A target detecting device with a light diffusion member that diffuses measuring light at the end portions of the light projecting path, allowing the light to be projected over a wider range without increasing the number of light emitting elements, while maintaining sufficient light intensity for accurate detection of long-distance targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large number of light emitting elements are used to extend the detection range of short-distance targets, then the detection range is extended, but the cost increases
Solution Approach 1:
The patent segments the light projecting path into multiple regions by positioning light diffusion members at specific locations (e.g., upper end portion, lower end portion, left end portion, right end portion). Each segment handles a specific angular range, allowing the system to achieve wide detection range coverage without using a large number of light emitting elements.
Solution Approach 2:
The patent introduces light diffusion members as intermediary components between the light emitting element and the target. These diffusion members redirect light at various angles to cover a wide detection range, replacing the need for multiple light emitting elements and thereby reducing cost.
2Measurement precision
If the light-emitting power of the light emitting element is increased to improve detection sensitivity of long-distance targets, then detection sensitivity is improved, but the light-emitting power is limited by current technology
Solution Approach 1:
The patent applies light diffusion members selectively at specific locations in the light projecting path rather than uniformly across the entire path. This localized application optimizes light distribution for both short-distance and long-distance targets, maintaining detection sensitivity without requiring excessive light-emitting power.
3Area of stationary object
If measuring light is diffused to extend the light projecting range, then the detection range is extended, but the light projection amount decreases making it difficult to improve detection sensitivity of long-distance targets
Solution Approach 1:
The patent segments the light diffusion function across multiple light diffusion members positioned at different locations. Each member handles a specific angular segment, ensuring that light is diffused only where needed to extend detection range while preserving sufficient light projection amount in each segment for long-distance target detection.
Solution Approach 2:
The patent applies partial diffusion at controlled locations rather than excessive diffusion across the entire light path. By positioning light diffusion members only at end portions of the light projecting path, the system achieves range extension without过度 reducing light projection amount.
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 device effectively extends the detection range for short-distance targets and enhances detection sensitivity for long-distance targets by optimizing light projection and reception, reducing the number of light emitting elements and maintaining high sensitivity without increasing costs.
Implementation Method 1
a light diffusion member configured to diffuse the measuring light emitted from the light emitting element while transmitting the measuring light
Data Source
AI summary
A target detecting device projects measuring light over a predetermined range in front of a vehicle, receives reflected light from a target, and detects the target or a distance to the target, based on a light reception signal output according to the light reception state. The light projecting unit includes a light emitting element emitting measuring light and light diffusion members. The light diffusion members are provided on an upper end portion and a lower end portion of a light projecting lens constituting part of a light projecting path, and diffuses, in the vertical direction, measuring light emitted from the light emitting element and traveling through the end portions in the vertical direction of the light traveling path while transmitting the measuring light.