公开(公告)号：US20200310323A1

公开(公告)日：2020-10-01

申请号：US16903052

申请日：2020-06-16

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

Inventor： Youngsu LEE ,  Heungsup PARK ,  Yuntae KIM ,  Eogkyu KIM

IPC: G03G15/00 ,  G03G15/23

Abstract: An image forming apparatus employing an electrophotographic image forming unit and an inkjet image forming unit, thereby being capable of printing an image on each of a front surface and the back surface of a recording medium,

公开(公告)号：US20220113665A1

公开(公告)日：2022-04-14

申请号：US17557871

申请日：2021-12-21

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Eogkyu KIM ,  Heungsup PARK

IPC: G03G15/00 ,  G03G9/08 ,  G03G9/09

Abstract: An example photodetector for detecting fluorescent toner includes a light emitting unit to emit light to a toner image, and a light receiving unit. The light receiving unit is to detect visible light reflected by the toner image, detect that the toner image includes the fluorescent toner based on the detection of the visible light, the visible light generated by the fluorescent toner and having a predetermined wavelength band different from a wavelength band of the emitted light, and output a signal corresponding to the detection of the fluorescent toner.

公开(公告)号：US20210072691A1

公开(公告)日：2021-03-11

申请号：US16981360

申请日：2019-03-25

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Eogkyu KIM ,  Heungsup PARK

IPC: G03G15/00 ,  G03G9/08 ,  G03G9/09

Abstract: A printer includes an image forming unit to form a toner image on an image receptor by using a toner containing fluorescent additives for generating light in a predefined wavelength band in response to light in an invisible wavelength band, transfer the toner image to a print medium, and fix the toner image on the print medium, a photodetector including a light emitting unit configured to irradiate light in an invisible wavelength band to the toner image accommodated in one of the image receptor and the print medium, and a light receiving unit to detect reflected light from the toner image, and a controller to control a printing operation of the image forming unit, based on a detection signal from the light receiving unit.