基于二维微透镜阵列增大手术显微镜出瞳直径方法研究

2D microlens array-based surgical microscope in optical system′s exit pupil expander

医生使用传统含目镜系统的手术显微镜进行手术,当其头部移动时,该系统仅存在很小的出瞳直径,因而这就迫使医生在手术过程中长时间保持头部在特定位置。可见,传统手术显微镜存在显著弊端:长时间持续观察会增加医生的疲劳度。对使用二维微透镜阵列(microlens array,MLA)增大目视光学系统出瞳直径进行了理论探讨,并用傅里叶光学原理进行了理论分析。并且在此基础上,设计了增大手术显微镜光学系统出瞳直径的二维微透镜阵列器件,该二维微透镜阵列器件中两个折射面相对放置,且两者相距一个微透镜单元焦距的长度。经计算机模拟计算证明,使用该二维微透镜阵列器件可以有效增大目视光学系统出瞳直径,并可获得更加均匀的出射光束。

The conventional surgical microscope uses eyepiece lens systems which have very small exit pupil to occur when the observer moves his head during observation, thereby obliging the observer to keep his head at a constant position while he performs the operations described above. Therefore, the conventional surgical microscope has a defect that it gives a strong feeling of fatigue when he continues observation for a long time. Two dimensional microlens array（MLA） can be used in wearable applications as exit pupil expanders to increase the size of the optical system exit pupil. Fourier optics theory was used to derive the analytical formulas, and physical optics beam propagation was used for numerical computations. The MLA′s reflective surface was spaced from the other focal curve about a focal length. A dual-MLA is proved that can produces excellent exit-pupil, and it can often generate output beamlets that have a more uniform brightness.