Patent ID: 9030664
Filing Date: 2015-05-12
Classification: G01N

Abstract:
1. A method for measuring transmissivity of a patterned glass substrate, comprising: radiating a laser beam having a size, at a single wavelength of 550 nm; collimating the laser beam with a collimation lens; expanding the size of the collimated laser beam; passing the expanded laser beam through a glass substrate having a plurality of pattern units on which the expanded collimated laser beam is incident; receiving, at a detector having a light-receiving section at least twice as large as a size of the expanded laser beam that is incident on the patterned glass substrate, the expanded laser beam that is passed through the patterned glass substrate; and measuring transmissivity of the patterned glass substrate based on the received laser beam; wherein the detector is 5 mm or less from a rear end of the patterned glass substrate.