Patent ID: 11906439
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. An optical inspection apparatus comprising:
an image forming optical system that forms an image of a light beam from a subject;
an imaging unit provided on an image forming plane of the image forming optical system;
a color filter that is provided on a focal plane of the image forming optical system between the image forming optical system and the imaging unit,
the color filter being configured to:
emit a light beam having a first wavelength and a light beam having a second wavelength different from the first wavelength in a single direction toward the imaging unit in accordance with a light beam direction from the subject in a state in which a light beam intensity of the first wavelength and a light beam intensity of the second wavelength have a complementary relationship, and
causes the imaging unit to acquire image data including ach of information of a first image related to the light beam having the first wavelength and information of a second image related to the light beam having the second wavelength; and

a processor configured to extract unevenness information of the subject by comparing the information of the first image with the information of the second image,
wherein the complementary relationship is a relationship in a certain pixel of the imaging unit, in which:
when the light beam intensity of the first wavelength is increased, the light beam intensity of the second wavelength is weakened in the same certain pixel, or
when the light beam intensity of the second wavelength is increased, the light beam intensity of the first wavelength is weakened in the same certain pixel.