| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective lens for an endoscope, which may be focused using a simple and cost-effective method, an actuator for focusing the objective lens, and an endoscope system including the objective lens. <P>SOLUTION: The objective lens for an endoscope includes a plurality of lenses and a stop ST, and an optical element OE disposed adjacent to the stop ST. A focal length may be varied by moving the optical element OE in a direction different from an optical axis O. The plurality of lenses comprise a front lens group G1 having a negative refractive power which is arranged in front of the stop and a rear lens group G2 having a positive refractive power which is arranged in rear of the stop, and the optical element is disposed between the front lens group and the stop or between the stop and the rear lens group. <P>COPYRIGHT: (C)2013,JPO&INPIT |
