JPH10193643A5

JPH10193643A5 -

Info

Publication number: JPH10193643A5
Application number: JP1997005015A
Authority: JP
Filing date: 1997-01-14
Publication date: 2004-12-16
Anticipated expiration: 2017-01-14

Claims

An inkjet recording device having a carriage configured to be able to move back and forth relative to a print medium, and a print head provided on the carriage and having a plurality of nozzle rows arranged therein and ejecting ink droplets from the nozzle rows, characterized in that the inkjet recording device further comprises a pair of light detection means that scan the nozzle rows at a predetermined inclination in a clockwise or counterclockwise direction with the center of the nozzle rows as the center of rotation in the direction of the nozzle rows.

2. An ink jet recording apparatus according to claim 1, wherein said light detecting means is an optical sensor provided at a position where light is scattered by the passage of ink droplets ejected from said nozzle array.

2. An ink jet recording apparatus according to claim 1, wherein said light detecting means is disposed at a predetermined inclination relative to said nozzle row so as to fully utilize the sensitivity region of said light sensor.

2. An ink jet recording apparatus according to claim 1, wherein the optical axis of said light detecting means has a predetermined inclination with respect to the head nozzle surface.

An inkjet recording device having a recording head in which a plurality of nozzles for ejecting ink droplets are arranged in a row, a carriage for moving the recording head back and forth relative to a printing medium, and an ejection detector for detecting the ejection state of the nozzles, characterized in that the ejection detector has a light-emitting element and a light-receiving element, and the optical axis connecting the elements is arranged at a predetermined inclination with respect to the row direction of the nozzles.

6. An inkjet recording apparatus according to claim 5, wherein the ejection detector has a sensitivity region capable of detecting ink droplets ejected within a predetermined width around the optical axis, and the nozzles are arranged at a predetermined inclination with respect to the nozzle array direction so that the nozzles at both ends of the plurality of nozzles are within the sensitivity region.

6. An ink jet recording apparatus according to claim 5, wherein said ejection detector is disposed at a home position of said recording head.

8. An ink jet recording apparatus according to claim 7, wherein the home position is a position where idling is performed to perform recovery processing for the nozzles.

6. An ink jet recording apparatus according to claim 5, wherein said ejection detector is provided on said recording head or on a carriage carrying said recording head.

a head having a nozzle array for ejecting ink droplets;
a light detecting means having a light emitting unit that emits light having an optical axis that is inclined with respect to the row direction of the nozzle row, and a light receiving unit that receives the light;
a control unit that ejects ink droplets from the nozzle array toward the light while moving the head relatively to the light, and detects the amount of light received by the light receiving unit.

A method for detecting inoperative nozzles in an inkjet recording device having a carriage configured to be able to move back and forth relative to a print medium, and a print head provided on the carriage and having a plurality of nozzle rows arranged therein and ejecting ink droplets from the nozzle rows, comprising:
a scanning step of scanning the nozzle array with light having an optical axis tilted at a predetermined angle clockwise or counterclockwise with the center of the nozzle array as the center of rotation in the direction of the nozzle array;

12. The inoperable nozzle detection method according to claim 11, further comprising the step of emitting the light at a position where the light is scattered by the passage of ink droplets ejected from the nozzle row.

12. The method of detecting inoperative nozzles according to claim 11, further comprising:
a step of emitting the light at a predetermined inclination relative to the nozzle row so as to fully utilize the sensitivity region of the optical sensor;

12. The method of detecting inoperative nozzles according to claim 11, further comprising:
a step of emitting the light so that the optical axis has a predetermined inclination with respect to the head nozzle surface;

A method for detecting inoperative nozzles in an inkjet recording device having a recording head in which a plurality of nozzles for ejecting ink droplets are arranged in a row, a carriage for moving the recording head back and forth relative to a print medium, and an ejection detector having a light-emitting element and a light-receiving element for detecting the ejection state of the nozzles, comprising:
a step of emitting light from the light-emitting element toward the light-receiving element such that the optical axis is inclined at a predetermined angle with respect to the row direction of the nozzles;

16. The method of detecting inoperative nozzles according to claim 15, further comprising:
the light has a sensitivity region capable of detecting ink droplets ejected within a predetermined width around the optical axis,
The inoperable nozzle detection method further comprises:
a step of emitting the light at a predetermined inclination with respect to the nozzle row direction so that nozzles at both ends of the plurality of nozzles are within the sensitive region;

16. The method of detecting inoperative nozzles according to claim 15, further comprising:
A method for detecting inoperative nozzles, comprising the step of detecting ink droplet ejection at a home position of the print head.

18. The method of detecting inoperative nozzles according to claim 17, further comprising:
The method for detecting inoperative nozzles includes a step of performing a blank discharge at the home position to perform a recovery process for the nozzles.

A method for detecting inoperative nozzles in a recording device equipped with a head having a nozzle array for ejecting ink droplets, comprising:
emitting light having an optical axis inclined at a predetermined angle with respect to the row direction of the nozzle row;
a step of ejecting ink droplets from the nozzle row toward the light while moving the head relatively to the light.