Optical Emitter Device for Motor Vehicle Scanning
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Solution Overview
Problem
Conventional optical detection apparatuses for motor vehicles, such as laser scanners, suffer from low efficiency and high losses due to distortion in the field of view caused by the angle between the light beam incidence and scanning direction, leading to inefficient object detection in the surrounding region.
Innovation Solution
The use of a light source with at least two separately driveable emitter elements, which emit light beams at specific angles of incidence to compensate for distortions caused by a tiltable mirror, allowing for a predetermined setpoint field of view to be maintained, and optionally utilizing a freeform mirror or lens to further correct deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the angle between the light beam incidence and scanning direction is increased to increase the aperture angle, then the field of view aperture angle is improved, but the field of view shape is distorted and detection efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the angle of incidence of the light beam onto the tiltable mirror. Instead of using a fixed incidence angle, the system varies the incidence angle as a control parameter to compensate for the distortion caused by the scanning angle, thereby maintaining both the aperture angle and the field of view shape
Solution Approach 2:
The patent implements feedback control by continuously monitoring the actual field of view shape and adjusting the light beam incidence angle accordingly. The system uses the relationship between scanning angle and incidence angle to provide feedback that corrects distortions in real-time, ensuring the field of view maintains its desired shape while preserving detection efficiency
2Adaptability or versatility
If a tiltable mirror is used to vary the scanning angle, then the scanning capability is improved, but the field of view shape distortion increases and causes losses
Solution Approach 1:
The patent introduces an intermediary parameter - the angle of incidence of the light beam - that acts as a mediator between the tiltable mirror's scanning function and the field of view shape preservation. By controlling this intermediary parameter, the system enables the tiltable mirror to provide scanning capability while compensating for its distorting effect on the field of view shape
Solution Approach 2:
The patent applies preliminary anti-action by pre-calculating and applying the appropriate incidence angle compensation before the distortion occurs. The system uses a predetermined relationship between scanning angle and incidence angle to counteract the distortion effect of the tiltable mirror in advance, preventing field of view shape degradation before it affects detection performance
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 a fully utilized illuminated angle range, enabling secure and reliable detection of objects, thereby enhancing the efficiency and reducing losses in the optical detection apparatus.
Implementation Method 1
a light source for emitting the light beam and a guiding unit, the guiding unit being configured in order to guide the light beam emitted onto the guiding unit by the light source into the surrounding region at different scanning angles
Implementation Method 2
The guiding unit is in this case generally configured as a rotatable or tiltable mirror, which reflects the light beam in the different scanning directions
Implementation Method 3
the light source for emitting the light beam comprises at least two separately driveable emitter elements, which are configured in order to emit the light beam onto the guiding unit at angles of incidence corresponding to predetermined setpoint values of the scanning angle
Data Source
AI summary
The invention relates to an emitter device (8) for an optical detection apparatus (3) of a motor vehicle (1), which is configured in order to scan a surrounding region (4) of the motor vehicle (1) by means of a light beam (10), and which comprises a light source (13) for emitting the light beam (10) and a guiding unit (15), the guiding unit (15) being configured in order to guide the light beam (10) emitted onto the guiding unit (15) by the light source (13) at different scanning angles (α). The light source (13) for emitting the light beam (10) comprises at least two separately driveable emitter elements (13a, 13b), which are configured in order to emit the light beam (10) onto the guiding unit (15) at angles of incidence (γ1, γ2) corresponding to predetermined setpoint values (−α3, −α2, −α1, α0, +α1, +α2, +α3) of the scanning angle (α) in order to generate a predetermined setpoint field of view (16) of the emitter device (8). The invention furthermore relates to an optical detection apparatus (3), to a motor vehicle (1) having at least one optical detection apparatus (3) and to a method for generating a setpoint field of view (16) for an emitter device (8) of an optical detection apparatus (3) of a motor vehicle (1).