Re-imaging optical system

摘要

A re-imaging optical system is an object side telecentric optical system and includes a front group having a positive refractive power, an aperture stop, and a rear group having a positive refractive power, in this order from the object side, wherein the rear group is composed of a positive lens disposed on the object side and a negative lens disposed on an image side, each of the positive lens and the negative lens is formed of a single lens or a cemented lens, and conditional expressions (1) and (2) are satisfied. Here, fR1 is the focal distance of the negative lens, f is the focal distance of an entire system, and L is a total length from an object surface to an image surface:
−2.2

主权项

1. A re-imaging optical system that is provided between an image guide and a solid-state image-acquisition device and that re-forms an image transmitted through the image guide at the solid-state image-acquisition device,
the re-imaging optical system being an object side telecentric optical system and comprising: a front group; an aperture stop; and a rear group, in this order from an object side, wherein the front group has a positive refractive power as a whole, the rear group is composed of two groups that are a positive lens disposed on the object side and a negative lens disposed on an image side, and has a positive refractive power as a whole, each of the positive lens and the negative lens is formed of a single lens or a cemented lens, and conditional expressions (1) and (2) below are satisfied:
−2.2