Design of Digital Imaging System for Slit Lamp Microscope

摘要

This paper using a field lens and an interface lens designed slit lamp microscope with a TV camera. Image of microscope objective through the field lens and interface lens are transmitted to the TV camera lens, and then imaged by the TV camera lens on the charge-coupled device (CCD) image sensor. Here, we use the function of zemax optics design program to multiple configuration designed, it include a television cameras of digital image and the microscopes bifunctional of slit lamp microscope. TV cameras use 3 million pixels charge-coupled device image sensor, the system required a slit length is 18 mm, the effective focal length is 11.23 mm, the spatial frequency of MTF is 801p/mm on the axis greater than 0.6, and the maximum field of view is greater than 0.3, the aberrations less than 5%. The designed result must be satisfy system specifications, make this slit lamp digital imaging system having a good optical quality. Because the illumination and binocular microscope are confocal and coaxial, so can reduce the system volume and easy to adjust when the assembly.