| 摘要 |
PURPOSE:To eliminate the need for extra signal processing for the removal of a self-diagnosing function by forming a cut surface which receives and reflects self-diagnosing light so that a detector detects it at the peripheral edge part of one optional lens of an optical system. CONSTITUTION:The cut surface A with a 45 deg. tilt angle is formed by cutting inside the outer peripheral edge part end surface of the optical flat lens 3 and this cut surface is a desired reflecting surface obtained by specular surface processing. A light source chamber 7 is projected from the outer peripheral surface of a lens barrel 1 right above the formation position of the cut surface A. The reflection angle of the cut surface A to the self-diagnosing light 1 is 90 deg., so the self-diagnosing light 11 is reflected by the cut surface A at right angles and incident on a combined lens 4 in parallel to an optical axis 12. Then, the light is incident on the optical axis position of a light receiving part 21 through combined lenses 5 and 6. Consequently, conventional extra signal processing is not necessary because no halfmirror is provided on the lens surface of the optical system. |
