| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system not to be impossible to detect a line of sight because of insufficiency of intensity of an illuminance given to eye ball. SOLUTION: An infrared rays emitting diode 1060 for naked eye is arranged at the opening of a prism 101 for a magnifying observation in a detecting means for line of sight 1006 to irradiate an eyeball 1005. An infrared rays emitting diode 1061 for glassed eye is arranged at the outside of the observation optical system area and at the eyeball 1005 side of the outside of the prism 101 to irradiate the eyeball 1005. Because the infrared rays emitting diode 1061 for glassed eye is arranged near by the eyeball 1005, if the eyeball 1005 is distant from a finder, the intensity of illuminance is not insufficient and eclipse by the opening of the prism 101 slightly occurs thereby the detection of line of sight can be surely conducted. |
