Abstract

Gradient-index rod lenses (SELFOC^® micro lens)¹⁾ have been widely used in medical optics devices, such as an endoscope which is an optical device for visualization in body cavities.²⁾ The basic structure of the gradient-index rod lens of the endoscope is shown in Fig. 1. It consists of two types of gradient-index rod lenses which are called the objective lens and the relay lens. The object is imaged onto the rear face of the objective lens and this image is transfered to the back of the relay lens.

© 1987 Optical Society of America