Patent ID: 11919317
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method of printing ink, comprising:
ejecting ink in which a plurality of particles is dispersed from an inkjet head;
irradiating the ejected ink with a first light and a second light having different wavelengths to acquire data on a first exit light and a second exit light emitted from the ink;
calculating a concentration of the particles in the ink from the data on the first exit light and the second exit light; and
checking whether the concentration is out of an error range from a reference value,
wherein the first light has a wavelength of about 500 nanometers (nm) or less, and the second light has a wavelength of about 1000 nm or more.