Choi Hojong, Jo Joohyun, Ryu Jae-Myung, Yeom Jung-Yeol
Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi, Korea.
Department of Optical Engineering, Kumoh National Institute of Technology, Gumi, Korea.
Technol Health Care. 2019;27(S1):133-142. doi: 10.3233/THC-199013.
Compared to laser, light-emitting diodes - non-coherent and divergent light sources requires that the developed optical system support steering and focusing of light on the desired target when acquiring information regarding human tissues.
A new optical system with an ultrawide angle was designed to cover large areas of the eye, including facial areas near the eye, in order to overcome the limited field of view of optical systems used for ophthalmology and dermatology applications.
To achieve a compact and handheld optical system for ophthalmology and dermatology applications, a contrast auto-focus (AF) method must be used, and the weight reduction of the AF group is considered during the design process to satisfy the effective focal length (EFL), back focal length (BFL), and front focal length (FFL) in the proposed optical system using Gaussian-bracket method.
The designed optical system can focus from infinity to a magnification of -0.19 times, representing a distance of 114.359 mm from the first surface of the optical system to the object. The AF lens moving distance from infinity to the minimum distance is approximately 4.984 mm. The full width at half maximum (FWHM) values of the red, green, and blue light-emitting diodes were 16 mm, 35 mm, and 22 mm, respectively.
We have designed an ultrawide-angle optical system for compact optical systems that are suitable for high-performance ophthalmology and dermatology applications.
与激光相比，发光二极管——非相干且发散的光源，在获取有关人体组织的信息时，要求所开发的光学系统能够将光线引导并聚焦到所需目标上。
设计一种具有超广角的新型光学系统，以覆盖眼睛的大面积区域，包括眼睛附近的面部区域，从而克服用于眼科和皮肤科应用的光学系统视野有限的问题。
为实现用于眼科和皮肤科应用的紧凑且手持式光学系统，必须采用对比度自动对焦（AF）方法，并且在设计过程中考虑减轻AF组的重量，以使用高斯括号法在所提出的光学系统中满足有效焦距（EFL）、后焦距（BFL）和前焦距（FFL）。
所设计的光学系统能够从无穷远聚焦到-0.19倍的放大倍率，即从光学系统的第一个表面到物体的距离为114.359毫米。AF镜头从无穷远移动到最小距离的距离约为4.984毫米。红色、绿色和蓝色发光二极管的半高全宽（FWHM）值分别为16毫米、35毫米和22毫米。
我们为适用于高性能眼科和皮肤科应用的紧凑光学系统设计了一种超广角光学系统。
