Laser Radar Beam Irradiation Device Miniaturization
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Solution Overview
Problem
Laser radar systems face increased costs and size due to the need for large light receiving surfaces and condenser lenses to handle high amplitudes of servo light, which are necessary for accurate scanning and detection.
Innovation Solution
A beam irradiation device with a movable diffused light source and a light projecting element positioned closer to the light receiving position detecting device, reducing the amplitude of light incident on the detector and allowing for miniaturization of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the moving amount of the scanning lens is increased to increase the amplitude of laser light in the target area, then the amplitude of servo light increases, but this requires a light receiving position detecting device with a relatively large light receiving surface, increasing the cost of the laser radar system
Solution Approach 1:
A condenser lens is introduced as an intermediary optical element between the scanning lens and the light receiving position detecting device. This condenser lens focuses the servo light onto a smaller area of the detector, allowing the use of a compact detector while still capturing the full amplitude range of the laser light in the target area.
Solution Approach 2:
The patent transitions from directly mapping the scanning lens position to the detector surface in one dimension, to using optical focusing that compresses the light distribution in spatial dimension, effectively decoupling the detector size from the scanning range requirement.
2Illumination intensity
If servo light is condensed on the light receiving position detecting device, then a large-sized condenser lens is necessary to condense servo light having a certain magnitude of amplitude on the light receiving position detecting device, but this increases the cost of a laser radar system and the size of an optical system
Solution Approach 1:
The patent optimizes parameters of the condenser lens (focal length, diameter) and the positioning of optical elements to achieve effective condensation of servo light with minimal optical components. By carefully selecting these parameters, the system achieves the required light amplitude on the detector without needing excessively large or complex optical elements.
3Measurement precision
If a large light receiving surface is used to detect scanning positions, then detection precision is maintained, but the cost and size of the system increase
Solution Approach 1:
The condenser lens acts as an intermediary that preserves the spatial information of the scanning lens position while compressing the light onto a smaller detector area. This maintains detection precision without requiring a large detector surface, as the lens effectively maps the scanning position to a corresponding position on the compact detector.
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 reduces the size and cost of the light receiving position detecting device, enabling a more compact and cost-effective laser radar system while maintaining detection precision.
Implementation Method 1
a light projecting element, disposed at a position closer to the light receiving position detecting device with respect to an intermediate position between the second light source and the light receiving position detecting device, for projecting an emission position to be defined by the second light source on the light receiving position detecting device via a predetermined projection area
Implementation Method 2
a light receiving position detecting device for receiving the diffused light to output a signal depending on a position of receiving the diffused light
Implementation Method 3
a second light source movable with the scanning section and adapted for emitting diffused light
Implementation Method 4
an actuator for moving a scanning section for receiving the laser light to scan a target area with the laser light
Data Source
AI summary
A beam irradiation device includes: a first light source for emitting laser light; an actuator for moving a scanning section for receiving the laser light to scan a target area with the laser light; a second light source movable with the scanning section and adapted for emitting diffused light; a light receiving position detecting device for receiving the diffused light to output a signal depending on a position of receiving the diffused light; and a light projecting element, disposed at a position closer to the light receiving position detecting device with respect to an intermediate position between the second light source and the light receiving position detecting device, for projecting an emission position to be defined by the second light source on the light receiving position detecting device via a predetermined projection area.