Image forming optical system

Abstract

Abstract PURPOSE:To obtain high-area magnification in the circumference of a field of view by providing an image forming lens, and a conical mirror which is constituted so that the center axis coincides with the optical axis of the image forming lens, and whose bus consists of a concave curve. CONSTITUTION:A titled system is provided with a conical mirror 14 which is placed in front of an image forming lens 3 so that the center axis coincides with the optical axis of the image forming lens 3, and whose bus consists of a concave curve. Therefore, when main light beams A, B are tracked from an image guide 2 side, they are condensed by the conical mirror 14, and as a result, an interval l2 in the direction parallel to the axis of an intersection point to a pipe wall S of the main light A and B becomes wider than an interval of conventional constitution, therefore, a short part forms an image on the same part on the incident end face of the image guide 2. Accordingly, in comparison with that of conventional constitution, the magnification in the direction parallel to the axis of the pipe wall S becomes high in the circumference of a field of view, and an image whose interval in the diameter direction is wide is obtained in the circumference of a field of view. Therefore, a detailed state of the pipe wall S can be observed.

Inventors

• 👤 Kimihiko Nishioka
• 👤 公彦 西岡
• 👤 Hiroyuki Kimura
• 👤 博之 木村

Bibliographic Details