Electronic Rearview Mirror Camera Tilt for Near-Far Focus
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Solution Overview
Problem
Conventional electronic rearview mirrors suffer from poor imaging clarity due to the inability to focus both distant and near views simultaneously, posing a safety hazard during driving.
Innovation Solution
The optical sensor is deflected relative to the optical lens, with the optical axis of the lens and the perpendicular line of the sensor no longer parallel, allowing both distant and near views to be focused on the imaging surface of the tilted optical sensor, and the deviation between the centers of the optical lens and sensor is maintained within 0.1 mm to 0.5 mm to enhance imaging clarity and magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical lens and optical sensor are aligned with parallel optical axes, then the structure is simple and easy to manufacture, but both distant and near views cannot be focused simultaneously, resulting in poor imaging clarity
Solution Approach 1:
The patent applies asymmetry by deliberately making the optical axis of the optical lens non-parallel to the optical axis of the optical sensor. The optical lens optical axis is tilted at an angle α (0.08° ≤ α ≤ 6.1°) relative to the sensor's perpendicular line, creating an asymmetric optical path that enables both distant and near views to be focused simultaneously on the sensor surface, thereby resolving the contradiction between structural simplicity and imaging clarity.
2Manufacturing precision
If the optical sensor is tilted relative to the optical lens, then both distant and near views can be focused simultaneously improving imaging clarity, but the alignment precision between lens and sensor must be controlled within 0.1 mm to 0.5 mm deviation
Solution Approach 1:
The patent applies parameter changes by optimizing and controlling specific parameters: the tilt angle α (0.08° ≤ α ≤ 6.1°) and the deviation d (0.1 mm ≤ d ≤ 0.5 mm). By establishing precise parameter ranges for the optical axis deviation and tilt angle, the patent enables both distant and near focus while maintaining manufacturability, transforming the alignment challenge into a controlled parameter optimization problem.
3Volume of moving object
If the optical lens focal length is within 3 mm to 25 mm, then the device size is compact and suitable for vehicle installation, but the imaging magnification and field of view must be optimized
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length parameter within a specific range (3 mm ≤ f ≤ 25 mm). This parameter optimization allows the device to maintain a compact size suitable for vehicle installation while achieving adequate imaging magnification and field of view through the combined effect of the tilted optical configuration and optimized focal length.
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 improves imaging clarity by ensuring both distant and near views are focused correctly, enhancing the driver's observation capabilities and safety by providing clearer images, while allowing for adjustable display positioning within the cockpit to prevent obstruction by weather conditions.
Implementation Method 1
an optical lens (3) and an optical sensor (4), wherein the optical lens (3) is located at a light incident side of the optical sensor (4) and is configured to transfer light to the optical sensor (4)
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure discloses a camera apparatus, an electronic rearview mirror, a vehicle and a design method for a vehicle. The camera apparatus of the electronic rearview mirror includes an optical sensor and an optical lens. The optical lens is located at a light incident side of the optical sensor and is configured to transfer light to the optical sensor. An optical axis of the optical lens is not parallel to a first perpendicular line, and the first perpendicular line is a straight line perpendicular to a light incident surface of the optical sensor.