Image forming apparatus, image forming method and non-transitory computer-readable storage medium
US-9223279-B2 · Dec 29, 2015 · US
Image forming apparatus and image forming method
US2022011705A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022011705-A1 |
| Application number | US-202117357162-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 24, 2021 |
| Priority date | Jul 8, 2020 |
| Publication date | Jan 13, 2022 |
| Grant date | — |
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Abstract
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An image forming apparatus includes: an image forming device configured to form a position detection pattern and a density detection pattern on a recording medium according to light emitted from an exposure device; a reading device configured to read the position detection pattern and the density detection pattern formed on the recording medium, the recording medium being conveyed in one of a plurality of orientations of the recording medium; and circuitry configured to correct a light intensity of the exposure device, based on the read position detection pattern and the read density detection pattern. For any one of the plurality of orientations of the recording medium, the position detection pattern is formed upstream of the density detection pattern in a sub-scanning direction.
First claim
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1 . An image forming apparatus comprising: an image forming device configured to form a position detection pattern and a density detection pattern on a recording medium according to light emitted from an exposure device; a reading device configured to read the position detection pattern and the density detection pattern formed on the recording medium, the recording medium being conveyed in one of a plurality of orientations of the recording medium; and circuitry configured to correct a light intensity of the exposure device, based on the read position detection pattern and the read density detection pattern, wherein, for any one of the plurality of orientations of the recording medium, the position detection pattern is formed upstream of the density detection pattern in a sub-scanning direction. 2 . The image forming apparatus according to claim 1 , wherein the image forming device is configured to form another position detection pattern downstream of the density detection pattern in the sub-scanning direction, in addition to the position detection pattern formed upstream of the density detection pattern. 3 . The image forming apparatus according to claim 1 , wherein the image forming device is configured to form the position detection pattern and the density detection pattern on one side of the recording medium. 4 . The image forming apparatus according to claim 1 , wherein the image forming device is configured to form the position detection pattern and the density detection pattern at a central portion of one side of the recording medium. 5 . The image forming apparatus according to claim 1 , wherein the image forming device is configured to form the position detection pattern and the density detection pattern at a central portion on opposing sides of the recording medium. 6 . The image forming apparatus according to claim 1 , wherein the image forming device is configured to form the position detection pattern and the density detection pattern on a first side of the recording medium at a first position in the sub-scanning direction, and form another position detection pattern and another density detection pattern on a second side opposite to the first side of the recording medium at a second position different from the first position in the sub-scanning direction. 7 . The image forming apparatus according to claim 3 , wherein the reading device is configured to read opposing sides of the recording medium. 8 . A method for correcting a light intensity, comprising: forming a position detection pattern and a density detection pattern on a recording medium according to light emitted from an exposure device; reading the position detection pattern and the density detection pattern formed on the recording medium, the recording medium being conveyed in one of a plurality of orientations of the recording medium; and correcting a light intensity of the exposure device, based on the read position detection pattern and the read density detection pattern, wherein, for any one of the plurality of orientations of the recording medium, the position detection pattern is formed upstream of the density detection pattern in a sub-scanning direction. 9 . The method of claim 8 , further comprising: forming another position detection pattern downstream of the density detection pattern in the sub-scanning direction, in addition to the position detection pattern formed upstream of the density detection pattern. 10 . The method of claim 8 , wherein the forming includes forming the position detection pattern and the density detection pattern on one side of the recording medium. 11 . The method of claim 8 , wherein the forming includes forming the position detection pattern and the density detection pattern at a central portion of one side of the recording medium. 12 . The method of claim 8 , wherein the forming includes forming the position detection pattern and the density detection pattern at a central portion on opposing sides of the recording medium. 13 . The method of claim 8 , wherein the forming includes forming the position detection pattern and the density detection pattern on a first side of the recording medium at a first position in the sub-scanning direction; and forming another position detection pattern and another density detection pattern on a second side opposite to the first side of the recording medium at a second position different from the first position in the sub-scanning direction. 14 . An image forming apparatus comprising: image forming means for forming a position detection pattern and a density detection pattern on a recording medium according to light emitted from an exposure device; reading means for reading the position detection pattern and the density detection pattern formed on the recording medium, the recording medium being conveyed in one of a plurality of orientations of the recording medium; controlling means for correcting a light intensity of the exposure device, based on the read position detection pattern and the read density detection pattern, wherein, for any one of the plurality of orientations of the recording medium, the position detection pattern is formed upstream of the density detection pattern in a sub-scanning direction.
Assignees
Inventors
Classifications
- G03G15/5062Primary
by measuring the characteristics of an image on the copy material · CPC title
with means for controlling illumination or exposure (G03G15/041 takes precedence) · CPC title
Details relating to power supplies, circuits boards, electrical connections · CPC title
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Frequently asked questions
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- What does patent US2022011705A1 cover?
- An image forming apparatus includes: an image forming device configured to form a position detection pattern and a density detection pattern on a recording medium according to light emitted from an exposure device; a reading device configured to read the position detection pattern and the density detection pattern formed on the recording medium, the recording medium being conveyed in one of a p…
- Who is the assignee on this patent?
- Shirasaki Yoshinori, Ricoh Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G03G15/5062. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jan 13 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).