Title:
LIQUID DISCHARGE HEAD, HEAD MODULE, HEAD UNIT, LIQUID DISCHARGE UNIT AND LIQUID DISCHARGE DEVICE
Document Type and Number:
Japanese Patent JP2021130251
Kind Code:
A
Abstract:
To reduce variation of discharging characteristics.SOLUTION: A liquid discharge head comprises: a plurality of nozzles 11 for discharging liquid arranged in two-dimensional matrix shapes; a plurality of pressure chambers 21 communicating with the plurality of nozzles 11 respectively; a plurality of supply passage branches 52 communicating with two or more pressure chambers 21; a plurality of recovery passage branches 53 communicating with two or more pressure chambers 21; a supply passage mainstream 56 communicating with the plurality of supply passage branches 52; and a recovery passage mainstream 57 communicating with the plurality of recovery passage branches 53, where the supply passage branches 52 and the recovery passage branches 53 are arranged alternately in parallel. In an arranging direction of the branches, two bypass passages 73 are provided, each of which communicates with the two supply passage branches 52 arranged at both sides across a recovery passage branch 53c1. When passage lengths of the two supply passage branches 52 are different, passage resistance of a bypass passage 73F communicating with a supply passage branch 52a whose passage length is short is higher than passage resistance of the bypass passage 73 communicating with a supply passage branch 52b whose passage length is long.SELECTED DRAWING: Figure 8
Inventors:
BANDO YOSHINORI
Application Number:
JP2020026943A
Publication Date:
September 09, 2021
Filing Date:
February 20, 2020
Export Citation:
Assignee:
RICOH CO LTD
International Classes:
B41J2/18; B41J2/14
Attorney, Agent or Firm:
Tomiho Inamoto