Patent US5444525A successfully refreshed from Google Patents.
US5444525A
Expired / Lapsed
US
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Image forming apparatus with image recording timing control
Assignee: Toshiba Corp
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Filing: 1994-03-15
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Granted: 1995-08-22
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Expires: 2014-03-15
Abstract
Abstract The image forming apparatus can retain a stable and high image quality for many hours without use of any high precise mechanical parts and without causing any non-uniformity and mal-registration in a color image. In the image forming apparatus, an image recording medium (photosensitive drum) (6a) is driven by a rotative driving mechanism (pulleys and belts) (40a); and an image recording section (print bar) (6c) records an image repeatedly on the rotating image recording medium (6a) in a direction perpendicular to a rotational direction of the image recording medium. The image recorded on the image recording medium (6a) is transcribed onto an image transcribing medium (paper) (22) being fed in the rotational direction of the image recording medium (6a) to form an image. In particular, the apparatus comprises a rotation detecting section (rotary encoder) (6r) for detecting angular travel rates of the image recording medium (6a); and a recording timing control section (5) for controlling recording timing (HSYNC) at which the image is started to be recorded in the direction perpendicular to the rotational direction of the image recording medium (6a), on the basis of the angular travel rates detected by the rotation detecting section (6r).
Inventors
- 👤 Masaki Takahashi
- 👤 Teruo Kurihara
- 👤 Nakaba Komiyama
- 👤 Manabu Mikami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/326; G03G15/01; G03G15/0142; G03G15/0178; G03G15/0194; H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/46; H04N1/50; H04N1/506; G03G15/04; G03G15/043; G03G15/0435; G03G2215/00; G03G2215/00025; G03G2215/00071; G03G2215/00075; G03G2215/0008; G03G2215/01; G03G2215/0103; G03G2215/0119; H04N1/113; H04N1/1135; H04N1/12; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02416; H04N2201/02439; H04N2201/02443; H04N2201/028; H04N2201/03; H04N2201/031; H04N2201/03104; H04N2201/0315; H04N2201/03158; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04715; H04N2201/04724; H04N2201/04725; H04N2201/04729; H04N2201/04731; H04N2201/04732; H04N2201/04734; H04N2201/04737; H04N2201/04753; H04N2201/04755; H04N2201/04758; H04N2201/04767; H04N2201/04789; H04N2201/04791; H04N2201/04793; H04N2201/04794; H04N2201/04798
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
220 words
An image forming apparatus for forming an image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction roughly perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling a scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means. 58
Claim 2
Dependent Claim
220 words
An image forming apparatus for forming an image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction roughly perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling a scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means. 58
Claim 3
Dependent Claim
72 words
The image forming apparatus of claim 1, wherein: said optical beam scanning and recording means includes polygonal mirror rotation detecting means for detecting angular travel rates of said rotary polygonal mirror; and said recording timing control means includes on-off timing control means for controlling the timing at which the optical beam is turned on and off, on the basis of the angular travel rates detected by said polygonal mirror rotation detecting means.
Claim 4
Dependent Claim
193 words
An image forming apparatus for forming an image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: an image recording medium for recording the image information; a rotational driving mechanism for driving said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium; memory means for previously storing fluctuations in angular travel rates of said image recording medium; calculating means for calculating predicted mal-register rates at a transfer position at which the image recorded on said image recording medium is transcribed onto the image transcribing medium, on the basis of the fluctuations in the angular travel rates stored in said memory means; and correcting means for correcting the recording timing on the basis of the calculated mal-register rates at the transfer position.
Claim 5
Dependent Claim
193 words
An image forming apparatus for forming an image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: an image recording medium for recording the image information; a rotational driving mechanism for driving said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium; memory means for previously storing fluctuations in angular travel rates of said image recording medium; calculating means for calculating predicted mal-register rates at a transfer position at which the image recorded on said image recording medium is transcribed onto the image transcribing medium, on the basis of the fluctuations in the angular travel rates stored in said memory means; and correcting means for correcting the recording timing on the basis of the calculated mal-register rates at the transfer position.
Claim 6
Dependent Claim
31 words
The image forming apparatus of claim 3, wherein said rotation detecting means is mounted on a drive shaft of said image recording medium to detect angular positions of the drive shaft.
Claim 7
Dependent Claim
52 words
The image forming apparatus of claim 3, wherein said rotational driving mechanism comprises a plurality of mutually connected rotational driving elements, a time required to rotate the rotational driving elements by one revolution being determined to be 1/integer times of a time required to rotate the image recording medium by one revolution.
Claim 8
Dependent Claim
95 words
The image forming apparatus of claim 3, wherein: said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means.
Claim 9
Dependent Claim
72 words
The image forming apparatus of claim 6, wherein: said optical beam scanning and recording means includes polygonal mirror rotation detecting means for detecting angular travel rates of said rotary polygonal mirror; and said recording timing control means includes on-off timing control means for controlling the timing at which the optical beam is turned on and off, on the basis of the angular travel rates detected by said polygonal mirror rotation detecting means.
Claim 10
Dependent Claim
207 words
A color image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein each of said image forming units comprises position detecting means for detecting that the image transcribing medium is fed to a predetermined position, the recording timing being controlled on the basis of a position signal detected by said position detecting means and an angular travel rate detected by said rotation detecting means.
Claim 11
Dependent Claim
207 words
A color image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein each of said image forming units comprises position detecting means for detecting that the image transcribing medium is fed to a predetermined position, the recording timing being controlled on the basis of a position signal detected by said position detecting means and an angular travel rate detected by said rotation detecting means.
Claim 12
Dependent Claim
22 words
The color image forming apparatus of claim 8, wherein said position detecting means is provided for each of said image forming units.
Claim 13
Dependent Claim
47 words
The color image forming apparatus of claim 8, wherein said position detecting means detects that the image transcribing medium is fed to the predetermined position by detecting that a mark described on a feeding medium for feeding the image transcribing medium is passed through the predetermined position.
Claim 14
Dependent Claim
243 words
An image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction roughly perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling a scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means.
Claim 15
Dependent Claim
243 words
An image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for rotating said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction roughly perpendicular to a rotational direction of said image recording medium; rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium, on the basis of the angular travel rates detected by said rotation detecting means, wherein said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling a scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means.
Claim 16
Dependent Claim
72 words
The image forming apparatus of claim 11, wherein: said optical beam scanning and recording means includes polygonal mirror rotation detecting means for detecting angular travel rates of said rotary polygonal mirror; and said recording timing control means includes on-off timing control means for controlling the timing at which the optical beam is turned on and off, on the basis of the angular travel rates detected by said polygonal mirror rotation detecting means.
Claim 17
Dependent Claim
220 words
A color image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for driving said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; and rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium; memory means for previously storing fluctuations in angular travel rates of said image recording medium; calculating means for calculating predicted mal-register rates at a transfer position at which the image recorded on said image recording medium is transcribed onto the image transcribing medium, on the basis of the fluctuations in the angular travel rates stored in said memory means; and correcting means for correcting the recording timing on the basis of the calculated mal-register rates at the transfer position.
Claim 18
Dependent Claim
220 words
A color image forming apparatus for forming a color image by recording image information and transcribing the recorded image information on an image transcribing medium, which comprises: a plurality of image forming units arranged in a feed direction of the image transcribing medium, each of said image forming units including: an image recording medium for recording the image information; a rotational driving mechanism for driving said image recording medium; image recording means for recording an image repeatedly on said rotating image recording medium in a direction perpendicular to a rotational direction of said image recording medium; and rotation detecting means for detecting angular travel rates of said image recording medium; and recording timing control means for controlling recording timing at which the image is started to be recorded in the direction perpendicular to the rotational direction of said image recording medium; memory means for previously storing fluctuations in angular travel rates of said image recording medium; calculating means for calculating predicted mal-register rates at a transfer position at which the image recorded on said image recording medium is transcribed onto the image transcribing medium, on the basis of the fluctuations in the angular travel rates stored in said memory means; and correcting means for correcting the recording timing on the basis of the calculated mal-register rates at the transfer position.
Claim 19
Dependent Claim
59 words
The color image forming apparatus of claim 13, wherein said image forming unit comprises position detecting means for detecting that the image transcribing medium is fed to a predetermined position, the recording timing being controlled on the basis of a position signal detected by said position detecting means and an angular travel rate detected by said rotation detecting means.
Claim 20
Dependent Claim
22 words
The color image forming apparatus of claim 13, wherein said position detecting means is provided for each of said image forming units.
Claim 21
Dependent Claim
47 words
The color image forming apparatus of claim 14, wherein said position detecting means detects that the image transcribing medium is fed to the predetermined position by detecting that a mark described on a feeding medium for feeding the image transcribing medium is passed through the predetermined position.
Claim 22
Dependent Claim
32 words
The color image forming apparatus of claim 13, wherein said rotation detecting means is mounted on a drive shaft of said image recording medium to detect angular positions of the drive shaft.
Claim 23
Dependent Claim
53 words
The color image forming apparatus of claim 13, wherein said rotational driving mechanism comprises a plurality of mutually connected rotational driving elements, a time required to rotate the rotational driving elements by one revolution being determined to be 1/integer times of a time required to rotate the image recording medium by one revolution.
Claim 24
Dependent Claim
96 words
The color image forming apparatus of claim 13, wherein: said image recording means includes optical beam scanning and recording means for rotating a rotary polygonal mirror to scan an optical beam in the direction roughly perpendicular to the rotational direction of said image recording medium and for recording an image on said image recording medium by turning on and off the optical beam; and said recording timing control means includes scanning speed control means for controlling scanning speed of the optical beam on the basis of the angular travel rates detected by said rotation detecting means.
Claim 25
Dependent Claim
73 words
The color image forming apparatus of claim 13, wherein: said optical beam scanning and recording means includes polygonal mirror rotation detecting means for detecting angular travel rates of said rotary polygonal mirror; and said recording timing control means includes on-off timing control means for controlling the timing at which the optical beam is turned on and off, on the basis of the angular travel rates detected by said polygonal mirror rotation detecting means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |