| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an image pickup optical system of endoscope capable of simultaneously obtaining plural observation images without causing the fluctuation of a focal position and defects of image even when an objective optical system at the tip is exchanged according to an observation purpose. SOLUTION: A tip adaptor 5 of an endoscope is attachable/detachable to an endoscope main body. Objective optical systems 6, 7 are arranged on the object side of the tip adaptor 5 and form the images of object on a visual field mask 9, respectively. An image transmission optical system 10 transmits once the image to CCD 11 while the position of the visual field mask 9 is made to be an object plane. The image transmission optical system 10 is separated by a brightness diaphragm 12 located on a pupil, a front group lens 10a and the rear group lens 10b are arranged on the side of the tip adaptor 5 and on the side of the endoscope main body 4, respectively. A color temp. converting filter 14 and an optical low pass filter 15 are joined in this order to the cover glass 13 of CCD 11.</p> |
