Illuminating apparatus for testing

An illuminating apparatus for testing comprising:

• an illuminating means having a predetermined illumination angle;
• a first total reflection mirror for changing the orientation of the optical axis of light emitted from said illuminating means to a nearly orthogonal direction;
• a second total reflection mirror for changing the orientation of the optical axis of light reflected by the first total reflection mirror to a nearly orthogonal direction, thereby turning the reflected light to the direction opposite to the direction said illuminating means emits light;
• a first lens for converging the light reflected by the second total reflection mirror and converting the light into collimated light;
• a second lens for converging light which has passed through through-holes formed in a tested target after having been emitted from the first lens as the collimated light;
• a third total reflection mirror for changing the orientation of the optical axis of light from the second lens to a nearly orthogonal direction;
• and a fourth total reflection mirror for changing the orientation of the optical axis of the light reflected by the third total reflection mirror to a nearly orthogonal direction, thereby making an imaging means take in the reflected light towards the same direction as the direction said illuminating means emits light.