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首页> 外文期刊>Applied optics >Design and fabrication of a freeform microlens array for a compact large-field-of-view compound-eye camera
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Design and fabrication of a freeform microlens array for a compact large-field-of-view compound-eye camera

机译：紧凑型大视场复眼相机的自由形式微透镜阵列的设计和制造

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In this research, a unique freeform microlens array was designed and fabricated for a compact compound-eye camera to achieve a large field of view. This microlens array has a field of view of 48 deg X 48 deg, with a thickness of only 1.6 mm. The freeform microlens array resides on a flat substrate, and thus can be directly mounted to a commercial 2D image sensor. Freeform surfaces were used to design the microlens profiles, thus allowing the microlenses to steer and focus incident rays simultaneously. The profiles of the freeform microlenses were represented using extended polynomials, the coefficients of which were optimized using ZEMAX. To reduce crosstalk among neighboring channels, a micro aperture array was machined using high-speed micromilling. The molded microlens array was assembled with the micro aperture array, an adjustable fixture, and a board-level image sensor to form a compact compound-eye camera system. The imaging tests using the compound-eye camera showed that the unique freeform microlens array was capable of forming proper images, as suggested by design. The measured field of view of +-23.5 deg also matches the initial design and is considerably larger compared with most similar camera designs using conventional microlens arrays. To achieve low manufacturing cost without sacrificing image quality, the freeform microlens array was fabricated using a combination of ultraprecision diamond broaching and a microinjection molding process.
机译：在这项研究中，为紧凑型复眼相机设计并制造了一种独特的自由曲面微透镜阵列，以实现大视野。该微透镜阵列的视场为48度X 48度，厚度仅为1.6毫米。自由形式的微透镜阵列位于平坦的基板上，因此可以直接安装到商用2D图像传感器上。自由曲面用于设计微透镜轮廓，从而允许微透镜同时控制和聚焦入射光线。使用扩展多项式表示自由形式微透镜的轮廓，使用ZEMAX优化其系数。为了减少相邻通道之间的串扰，使用高速微铣加工了微孔阵列。模制的微透镜阵列与微孔阵列，可调夹具和板级图像传感器组装在一起，以形成紧凑的复眼相机系统。使用复眼相机的成像测试表明，独特的自由曲面微透镜阵列能够形成适当的图像，这是设计所建议的。所测量的+ -23.5度视场也与初始设计相匹配，并且与使用传统微透镜阵列的大多数类似相机设计相比，其视野要大得多。为了在不牺牲图像质量的情况下实现较低的制造成本，使用超精密金刚石拉削和微注射成型工艺的组合来制造自由形式的微透镜阵列。

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