ILLUMINATION DEVICE FOR VISUAL INSPECTION BASED ON REFLECTED LIGHT AND TRANSMITTED LIGHT

摘要

in the conventional method for inspecting defects such as a polarizing film, a milk-white acrylic diffuser for three wavelength fluorescent lamps transmitting from the use of a lighting device with a not available and only inspection by transmitted light, a wavelength change according to the type of the defect can not be performed in a different color to the test, to distinguish the direction of height (unevenness) of the defect No, not yet, so only use scattered light, there is a problem to miss a defect such as an easy smile. ; So, in the present invention, the transparent portion (2) for irradiating the illumination light on top of the substrate 1, opposite to the transparent portion disposed obliquely to the reflection mirror 3, the lower portion of the gas the object to be inspected 10, the mirror (5) and, at the same time the inclined arrangement for mounting the transmission, a lighting device for a visual inspection of a Fresnel lens arrangement (6) between the reflection mirror and transmitted through the mirror has been proposed.