In-Vehicle Camera Ventilation Layout for Lens Barrel Heat Isolation
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Solution Overview
Problem
In in-vehicle cameras, heat generated by the image processing circuit can be transmitted to the circuit board, causing an increase in temperature of the lens barrel, which hinders accurate recognition.
Innovation Solution
The in-vehicle camera design separates the image processing circuit and the lens barrel in a direction parallel to the installation face and perpendicular to the optical axis, with a ventilation passage connecting vent holes on either side of the housing, allowing heated air to be discharged away from the lens barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image processing circuit is disposed on a straight line obtained by projecting the optical axis onto the circuit board to arrange transmission paths in equal length, then the signal transmission phase consistency is improved, but the heat generated by the image processing circuit is transmitted to the lens barrel causing temperature increase
Solution Approach 1:
The patent divides the housing into multiple spaces: a first space for the lens barrel and a second space for the image processing circuit, separated by a partition wall. This spatial segmentation allows the transmission paths to be arranged in equal length for phase consistency while preventing heat transmission from the image processing circuit to the lens barrel through the partition structure.
2Loss of energy
If the imaging element and image processing circuit are separately arranged into upper and lower space sections to cause vertical convection for heat dissipation, then the heat dissipation efficiency is improved, but the heat generated in the image processing circuit is transmitted to the circuit board right above causing temperature increase of the imaging device or lens barrel
Solution Approach 1:
The patent introduces a partition wall as an intermediary structure between the first space (lens barrel) and second space (image processing circuit). The partition wall includes a through-hole that allows controlled air flow for heat dissipation while the wall itself acts as a thermal barrier, preventing direct heat transmission to the imaging device and lens barrel.
3Volume of moving object
If the lens barrel and image processing circuit are disposed close to each other to reduce device size, then the compactness is improved, but the heat from the image processing circuit directly affects the lens barrel
Solution Approach 1:
The patent segments the housing into distinct spaces for the lens barrel and image processing circuit using a partition wall, allowing these components to be disposed close to each other for compactness while the partition wall structure prevents direct heat transmission from the image processing circuit to the lens barrel.
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 design effectively dissipates heat away from the lens barrel, maintaining its optimal operating temperature and ensuring accurate recognition of objects and infrastructure.
Implementation Method 1
the imaging element and the image processing circuit are separately arranged into an upper and lower space sectioned vertically, and convection is caused vertically by a cutout in a circuit board provided behind the imaging device
Data Source
AI summary
The in-vehicle camera comprises a lens barrel; a circuit board on which an image processing circuit is mounted, the image processing circuit performing image processing to recognize a subject from video signals; and a housing which includes an intake vent and an exhaust vent and accommodates therein the circuit board such that the image processing circuit and the lens barrel are away from each other in the left-right direction. The in-vehicle camera is configured such that a ventilation passage connecting the intake vent and an exhaust vent is formed between an inner face on a side of the installation face of the housing and the circuit board in a path that is away from the lens barrel and passes through a region in which the image processing circuit is disposed.