公开(公告)号：US20210213735A1

公开(公告)日：2021-07-15

申请号：US16089540

申请日：2017-04-24

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Oriol BORRELL CARBONELL ,  Oscar MOYA ,  Luis Miguel BRUGAROLAS

IPC: B41J2/125 ,  B41J2/165 ,  B41J2/21 ,  G01N21/85

Abstract: A printer comprises a print head comprising nozzles to selectively deposit liquid drops to selected portions of a receiving surface, a radiation light source to supply first light to the receiving surface, and a drop detector. The drop detector detects a flying liquid drop ejected by one of the nozzles and comprises a detector light source to emit a light beam of second light and a light detector to detect the light beam of the second light. The second light is distinguishable by the drop detector from the first light.