| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device for image processing inspection having a depth of field in an object passing field, being capable of equally illuminating an imaging area of a solid object besides a flat object, and precisely inspecting a subject because of a small temperature rise by heat generation. SOLUTION: This lighting device has a reflecting mirror 15 in an elliptical shape with a long focal interval arranged inside a lighting device body 11 for image processing inspection having a light transmission plate in front, and a linear high-pressure discharge lamp 16 mounted inside of the body 11 at a primary focal position of the reflecting mirror. A cooler 17 is arranged at one of side walls of the lighting device body 11, thereby cooling the high-pressure discharge lamp 16. An inner surface of the reflecting mirror is formed as a diffusing surface and a depth of field is arranged in an object passing field that passes through a secondary focal position. |
