Ultra-Wide Car Lens Optimization Based on Low-Tg Aspheric Glass

Abstract:

Car camera lens is widely used for the safety system of all kinds of vehicles. The car lens should have very wide field angle, strong ability to endure vibration and thermo-mechanical instability as well as erosion. According to these requirements, a new car lens is designed based on the aspheric glass lenses. The whole structure of car lens contains six separated glass lenses including two aspheric lenses. To reduce the cost, the aspheric lenses are made from low-Tg glass which is adaptable for mass production by glass molding press. The total track of lens is less than 30mm. For the enhancement of night vision, the F-number is set to be 2.4. The full FOV (field of view) of 160 is wide enough to capture all the dangerous information around the car. The imaging resolution is designed to be 3 Mega pixels. The designed result proves that the new car lens features high imaging quality. Its MTF (modulation transfer function) value is not less than 0.15 at the Nyquist frequency as for the field angle of 160. At the half Nyquist frequency, the MTF values of the most field angles are not less than 0.5. Therefore, the new lens could be used in the front of car to monitoring the dangerous cases around the corner.

• Periodical: Advanced Materials Research (Volume 497)
• Pages: 230-234
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.497.230
• Online since: April 2012
• Authors: Yong Jian Zhu, Jing Xin Na, Jian Feng Sun, Shao Hui Yin
• Keywords: Aspheric Glass, Car Lens, Optical Design, Wide Angle

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