Vehicle Projector Bandpass Filter for Red Light Blocking
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Solution Overview
Problem
Conventional image pickup devices for vehicles struggle to block distracting light wavelengths, such as red, without blocking essential visible wavelengths, leading to economic impracticality and reduced efficiency due to the need for expensive filters and low sensitivity LEDs.
Innovation Solution
A device with multiple light sources of different wavelengths, including LEDs and other emitters, is used to mix light before reaching the driver, with a controlling mechanism to adjust output based on ambient conditions, ensuring that distracting wavelengths are minimized while maintaining visibility, using a combination of near-infrared and visible light sources to reduce red tinge visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a visible light blocking means completely blocks visible wavelengths, then distracting light is blocked, but light in a range of visible wavelengths required for visibility is also blocked
Solution Approach 1:
The patent applies local quality by using a bandpass filter that selectively transmits specific wavelength ranges (450-480nm blue light and 600-650nm red light) while blocking other visible wavelengths. This allows the system to block distracting light in certain spectral regions while maintaining transmission of visibility-critical wavelengths, rather than uniformly blocking all visible light.
Solution Approach 2:
The patent changes the spectral parameters of the blocking means by using a bandpass filter with specific transmission characteristics. Instead of a broad-spectrum visible light blocker, the system uses a filter with defined wavelength transmission windows (450-480nm and 600-650nm), thereby altering which portions of the visible spectrum are blocked versus transmitted.
2Ease of manufacture
If an inexpensive visible light blocking means is used, then cost is reduced, but light in a range of visible wavelengths required for visibility is blocked
Solution Approach 1:
The patent changes the spectral parameters by specifying a bandpass filter with transmission characteristics that allow 450-480nm and 600-650nm wavelengths to pass while blocking other visible ranges. This parameterized approach enables the use of more affordable filtering solutions that still maintain adequate visibility by preserving critical wavelength bands.
Solution Approach 2:
The patent applies local quality by targeting specific wavelength ranges for blocking rather than implementing a uniform visible light block. The bandpass filter selectively addresses problematic spectral regions while maintaining transmission in visibility-critical regions, achieving cost-effective light management without sacrificing overall visibility.
3Illumination intensity
If LEDs are arranged in an array configuration to increase brightness, then sufficient light output is obtained, but the construction complexity increases
Solution Approach 1:
The patent merges multiple LED light sources into a single illumination system directed at the driver's face. By combining several LEDs (including blue, green, yellow-green, and red wavelengths) into one integrated array configuration, the system achieves sufficient brightness through collective emission while maintaining a unified structural design that reduces overall construction complexity.
Solution Approach 2:
The patent applies multi-functionality by using an LED array that simultaneously provides multiple wavelength emissions (blue 450-480nm, green 500-550nm, yellow-green 560-580nm, red 620-650nm) from a single device. This multi-wavelength capability allows the system to achieve adequate brightness while also enabling wavelength-selective filtering and driver state detection functions.
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 approach effectively blocks distracting light without blocking essential wavelengths, enhancing driver safety and reducing costs by using an inexpensive construction, while maintaining visibility and awareness through adjustable light output based on conditions.
Implementation Method 1
a bandpass filter that transmits light having wavelengths within a first wavelength range of 450 nm to 480 nm and light having wavelengths within a second wavelength range of 600 nm to 650 nm
Implementation Method 2
In such a conventional device, LEDs may be configured or caused to continuously emit light
Data Source
AI summary
Light generated at a specific wavelength corresponding to a particular color or color range that is distracting or disruptive to a driver during a normal operation is blocked through an inexpensive construction without blocking light in a required range of wavelengths. A projector is constructed such that a plurality of LEDs are arranged in an array configuration. The LEDs can include a tinge of red reduction LED and near-infrared LEDs. The projector can be installed in a vehicle and disposed in proximity to the camera. In some embodiments, the projector can be controlled by a control circuit to be turned on in conjunction with the shutter of a camera.