| 摘要 |
PROBLEM TO BE SOLVED: To measure glossiness with simple constitution and low cost by extracting two current values corresponding to components of proper reflection and scattered reflection lights and comparing them. SOLUTION: The light from a light source 1 is focused with a condenser lens in a spot light state for casting on a specimen to be measured 3 and a half of the reflection light from the specimen surface is passed through a 1/2 wave length plate (phase difference film) 4 and a polarizing plate 5 and the remaining half is passed only through the polarizing plate 5 to introduce in a position detection sensor(PSD) 6. The PSD 6 introduces in the right region the reflection light consisting of proper reflection light and scattered reflection light having passed only the polarizing plate 5 and introduces in the left region the reflection light of only scattered light having passed both the 1/2 wave length plate and the polarizing plate 5. By processing the current determined by irradiation light quantity of these reflection light, irradiation position and the inter-electrode resistance and the like of the PSD 6 and obtaining a voltage corresponding to the reflection light quantity, glossiness of the specimen surface is measured with the degree of the voltage.
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