In order to solve the problem of high-cost of the vehicle-assisted driving system and satisfy the requirements of highimaging-quality, the vehicle-mounted infrared optics is light, small, low-cost and mass-produced. In this paper, a compact single-piece free-from prism is used to achieve in-vehicle thermal imaging optical system with waveband of 8~12um, field-of-view of ±14°×±10.5°, F-number of 1 and focal length of 16mm. The optics has a compact structure similar to two-mirror off-axis system, and has the same characteristics with refractive optics of high-quality and low difficulty in installation. Through the process improvement method, the use of molding technology can further reduce the cost of lens, especially suitable for large-volume small-aperture optical systems.
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