Image forming apparatus and method for controlling the same and computer-readable recording medium

Patent metadata

Field	Value
Publication number	US-10162297-B2
Application number	US-201715648005-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Aug 1, 2016
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

An image forming apparatus is provided. The image forming apparatus includes: a plurality of photosensitive drums; a plurality of exposurers exposing some area of surfaces of each of the plurality of photosensitive drums; a plurality of developers disposing a toner in the exposed area on the surfaces of each of the plurality of photosensitive drums; an intermediate transfer belt transferred with the toner disposed on each of the plurality of photosensitive drums to form a pattern; and a processor controlling the plurality of photosensitive drums or the plurality of exposurers to form a printed pattern on the intermediate transfer belt at a predetermined first concentration in response to a print command being input and form a registration pattern on the intermediate transfer belt at a second concentration lower than the first concentration in response to a registration command being input.

First claim

What is claimed is:

1. An image forming apparatus, comprising:
a plurality of photosensitive drums;
a plurality of exposurers configured to respectively expose areas of surfaces of the plurality of photosensitive drums;
a plurality of developers configured to respectively dispose toner on the exposed areas of the plurality of photosensitive drums;
an intermediate transfer belt configured to receive the toner disposed on each of the exposed areas, to thereby form a pattern on the intermediate transfer belt; and
at least one processor configured to
control the plurality of photosensitive drums or the plurality of exposurers to form a printed pattern on the intermediate transfer belt at a predetermined first concentration in response to a print command being input, and
control the plurality of photosensitive drums or the plurality of exposurers to form a registration pattern on the intermediate transfer belt at a second concentration lower than the first concentration in response to a registration command being input.

2. The image forming apparatus as claimed in claim 1 , further comprising:
a light emitter configured to irradiate light to a predetermined area of the intermediate transfer belt; and
a sensor configured to detect light reflected from the predetermined area of the intermediate transfer belt to thereby generate a detection signal,
wherein the at least one processor controls the light emitter and the sensor to be activated in response to the registration command being input and performs a registration correction based on the detection signal generated by the sensor.

3. The image forming apparatus as claimed in claim 2 , wherein a strength of the detection signal for the registration pattern formed at the second concentration is within a predetermined range of strength of the detection signal for the printed pattern formed at the first concentration.

4. The image forming apparatus as claimed in claim 3 , wherein the strength of the detection signal for the registration pattern formed at the second concentration for yellow (Y), magenta (M), and cyan (C) colors is equal to a strength of the detection signal for the printed pattern formed at the first concentration.

5. The image forming apparatus as claimed in claim 2 , wherein
the first concentration and the second concentration are among a plurality of first concentrations and a plurality of second concentrations, respectively,
the image forming apparatus further comprises a storage configured to store information on the plurality of second concentrations corresponding to the plurality of first concentrations in a look-up table, respectively, and
the information on the plurality of second concentrations includes, for each of the plurality of second concentrations, at least one of a duty cycle, an exposure voltage, and a transfer voltage corresponding to the respective second concentration.

6. The image forming apparatus as claimed in claim 5 , wherein the processor updates the look-up table based on a detection signal for a concentration patch pattern differentiated from the registration pattern.

7. The image forming apparatus as claimed in claim 1 , wherein
to carry out forming of the printed pattern on the intermediate transfer belt in response to the print command being input, the at least one processor controls the plurality of exposurers to expose an area, corresponding to the printed pattern, of the respective surfaces of the plurality of photosensitive drums at a predetermined first duty cycle, and
to carry out forming of the registration pattern on the intermediate transfer belt in response to the print registration being input, the at least one processor controls the plurality of exposurers to expose an area, corresponding to the registration pattern, of the respective surfaces of the plurality of photosensitive drums at a second duty cycle smaller than the first duty cycle in response to the registration command being input.

8. The image forming apparatus as claimed in claim 1 , wherein
to carry out forming of the printed pattern on the intermediate transfer belt in response to the print command being input, the at least one processor supplies a predetermined first voltage to the exposurer, and
to carry out forming of the registration pattern on the intermediate transfer belt in response to the registration command being input, the at least one processor supplies a second voltage lower than the first voltage to the plurality of exposurers.

9. The image forming apparatus as claimed in claim 1 , wherein
to carry out forming of the printed pattern on the intermediate transfer belt in response to the print command being input, the at least one processor supplies a predetermined first transfer voltage to the plurality of photosensitive drums, and
to carry out forming of the registration pattern on the intermediate transfer belt in response to the registration command being input, the at least one processor supplies the second transfer voltage lower than the first transfer voltage to the plurality of photosensitive drums.

10. The image forming apparatus as claimed in claim 9 , further comprising:
a plurality of blades configured to clean a residual toner remaining on each of the plurality of photosensitive drums after the toner is transferred to the intermediate transfer belt depending on the supplied second transfer voltage.

11. A method for controlling an image forming apparatus including an intermediate transfer belt and configured to form a printed pattern on the intermediate transfer belt at a predetermined first concentration in response to a print command being input, the method comprising:
in response to a registration command being input,
exposing some area of surfaces of each of a plurality of photosensitive drums of the image forming apparatus,
disposing toner in the exposed area on the surfaces of each of the plurality of photosensitive drums, and
transferring the toner disposed on each of the plurality of photosensitive drums to the intermediate transfer belt to form a registration pattern on the intermediate transfer belt at a second concentration lower than the first concentration.

12. The method as claimed in claim 11 , further comprising:
irradiating light to a predetermined area of the intermediate transfer belt if the registration command is input;
generating a detection signal by detecting light reflected from the predetermined area of the intermediate transfer belt; and
performing a registration correction based on the detection signal.

13. The method as claimed in claim 12 , wherein a strength of the detection signal for the registration pattern formed at the second concentration is within a predetermined range of strength of the detection signal for the printed pattern formed at the first concentration.

14. The method as claimed in claim 13 , wherein the strength of the detection signal for the registration pattern formed at the second concentration for yellow (Y), magenta (M), and cyan (C) colors is equal to a strength of the detection signal for the printed pattern formed at the first concentration.

15. The method as claimed in claim 12 , wherein
the first concentration and second concentration are among a plurality of first concentrations and a plurality of second concentrations, respectively, and the image forming apparatus,
the method further comprises storing information on a plurality of second concentrations corresponding to a plurality of first concentrations in a look-up table, and
the information on the plurality of second concentrations includes, for each of the plurality of second c

Assignees

• S Printing Solution Co Ltd
• Hp Printing Korea Co Ltd

Inventors

• Lee Kyung-Ha
• Yoo Jae-Bum

Classifications

• G03G15/5058

  using a test patch · CPC title

• G03G15/1605 Primary

  using at least one intermediate support (G03G15/1625 takes precedence) · CPC title

• G03G15/5054 Primary

  by measuring the characteristics of an intermediate image carrying member or the characteristics of an image on an intermediate image carrying member, e.g. intermediate transfer belt or drum, conveyor belt · CPC title

• G03G2215/0161

  Generation of registration marks · CPC title

• G03G2215/0158

  Colour registration · CPC title