Electronic Rearview Mirror Camera Tilt for Dual-Range 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 axis and sensor is maintained between 0.1 mm and 0.5 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical sensor is positioned perpendicular to the optical lens (optical axis parallel to perpendicular line), then the structure is simple and alignment is easy, but both distant and near views cannot be focused simultaneously resulting in poor imaging clarity
Solution Approach 1:
The optical sensor is intentionally positioned at an asymmetric angle relative to the optical lens, with the optical axis of the lens forming a non-zero angle with the perpendicular line to the sensor's light incident surface. This asymmetric arrangement enables both distant and near views to be focused simultaneously on the imaging surface, resolving the contradiction between structural simplicity and imaging clarity.
Solution Approach 2:
The patent changes the positional parameter of the optical sensor from a perpendicular alignment to a tilted alignment, where the angle between the optical axis and the perpendicular line is controlled within a specific range (0.08°≤α≤6.1°). This parameter modification allows the optical system to achieve simultaneous focus for both distant and near objects, improving imaging clarity while maintaining reasonable alignment complexity.
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 requirement increases
Solution Approach 1:
The patent defines specific parameter ranges for the tilt angle (0.08°≤α≤6.1°) and deviation distance (0.1 mm≤d≤0.5 mm) to optimize the balance between imaging clarity and alignment precision. By constraining these parameters within controlled ranges, the system achieves simultaneous focus for distant and near views while maintaining manufacturable alignment tolerances.
Solution Approach 2:
The patent applies local quality optimization by specifically controlling the tilt angle and deviation distance at critical positions (the interface between optical lens and sensor) rather than requiring precision throughout the entire system. This localized precision approach enables improved imaging clarity without excessively increasing overall alignment complexity.
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 enhances imaging clarity by ensuring both distant and near views are in focus, increasing magnification for distant views and reducing distortion, thereby improving driver observation and safety.
Implementation Method 1
an optical lens (3) and an optical sensor (4). 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
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.