US5463473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siphen for correcting a pulse-width modulated signal in a recording apparatus
Assignee: Canon Inc
•
Filing: 1993-06-02
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Granted: 1995-10-31
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Expires: 2013-06-02
Abstract
Abstract An image forming apparatus suitable for use in a laser beam printer includes an image forming unit for forming an image on a photoconductor, and a reproduction unit for reproducing a high density image and a halftone image on the photoconductor. A detector then detects the density of the high density image and the halftone image formed on the photoconductor. A controller controls an image forming condition of the image forming unit based on a detection result by the detector.
Inventors
- 👤 Hiromichi Yamada
- 👤 Masaharu Ohkubo
- 👤 Masaki Ojima
- 👤 Hiroshi Sasame
- 👤 Takashi Kawana
- 👤 Kaoru Seto
- 👤 Hiroshi Mano
- 👤 Tetsuo Saito
- 👤 Atsushi Kashihara
- 👤 Michio Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:04
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4055; H04N1/4056; H04N1/407; H04N1/4076; H04N1/4078
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
90 words
A recording apparatus comprising: input means for inputting a pulse-width-modulated signal sent from an external host device; correction means for correcting a pulse-width of the pulse-width-modulated signal input by the input means; detecting means for detecting an environmental condition inside of the recording apparatus, and for outputting a detection result; and recording means for recording an image in accordance with the pulse-width=modulated signal corrected by said correction means; wherein said correction means corrects the pulse-width of the pulse-width-modulated signal in accordance with the detection result output by said detecting means.
Claim 2
Dependent Claim
90 words
A recording apparatus comprising: input means for inputting a pulse-width-modulated signal sent from an external host device; correction means for correcting a pulse-width of the pulse-width-modulated signal input by the input means; detecting means for detecting an environmental condition inside of the recording apparatus, and for outputting a detection result; and recording means for recording an image in accordance with the pulse-width=modulated signal corrected by said correction means; wherein said correction means corrects the pulse-width of the pulse-width-modulated signal in accordance with the detection result output by said detecting means.
Claim 3
Dependent Claim
44 words
A recording apparatus according to claim 1, further comprising environment condition detecting means for detecting an environment condition in the apparatus, wherein said correction means corrects the pulse-width of the pulse-width-modulated signal in accordance with a detection result by said environment condition detecting means.
Claim 4
Dependent Claim
24 words
A recording apparatus according to claim 2, wherein said environment condition detecting means includes a temperature detector for detecting a temperature in the apparatus.
Claim 5
Dependent Claim
24 words
A recording apparatus according to claim 1, wherein the corrected pulse-width-modulated signal is transmitted to said recording means in synchronism with a clock signal.
Claim 6
Dependent Claim
18 words
A recording apparatus according to claim 1, wherein said recording means carries out recording by an electrophotographic method.
Claim 7
Dependent Claim
29 words
A recording apparatus according to claim 5, further comprising laser beam generating means for generating a laser beam modulated by the corrected pulse-width-modulated signal sent from said correction means.
Claim 8
Dependent Claim
66 words
An image processing apparatus comprising: input means for inputting a pulse-width modulated signal sent from an external host device; manual operating means for changing an image density; and correction means for correcting a pulse width of the pulse-width-modulated signal input by said input means in accordance with a manual operation of said manual operating means, and for outputting the corrected pulse-width-modulated signal to a printing unit.
Claim 9
Dependent Claim
66 words
An image processing apparatus comprising: input means for inputting a pulse-width modulated signal sent from an external host device; manual operating means for changing an image density; and correction means for correcting a pulse width of the pulse-width-modulated signal input by said input means in accordance with a manual operation of said manual operating means, and for outputting the corrected pulse-width-modulated signal to a printing unit.
Claim 10
Dependent Claim
25 words
An image processing apparatus according to claim 7, wherein the corrected pulse-width-modulated signal is transmitted to said printing unit in synchronism with a clock signal.
Claim 11
Dependent Claim
24 words
An image processing apparatus according to claim 7, wherein said correction means comprises means for variably setting a correcting amount of the pulse width.
Claim 12
Dependent Claim
13 words
An image processing apparatus according to claim 7, further comprising said printing unit.
Claim 13
Dependent Claim
19 words
An image processing apparatus according to claim 10, wherein said printing unit carries out printing by an electrophotographic method.
Claim 14
Dependent Claim
30 words
An image processing apparatus according to claim 11, further comprising laser beam generating means for generating a laser beam modulated by the corrected pulse-width-modulated signal sent from said correction means.
Claim 15
Dependent Claim
90 words
An image processing apparatus comprising: first input means for inputting a pulse-width-modulated signal sent from an external host device; second input means for inputting a density command signal from said external host device; command discrimination means for discriminating the density command signal input by said second input means; and correction means for correcting a pulse width of the pulse-width-modulated signal input by said first input means in accordance with the density command signal discriminated by said command discrimination means, and for outputting the corrected pulse-width-modulated signal to a printing unit.
Claim 16
Dependent Claim
90 words
An image processing apparatus comprising: first input means for inputting a pulse-width-modulated signal sent from an external host device; second input means for inputting a density command signal from said external host device; command discrimination means for discriminating the density command signal input by said second input means; and correction means for correcting a pulse width of the pulse-width-modulated signal input by said first input means in accordance with the density command signal discriminated by said command discrimination means, and for outputting the corrected pulse-width-modulated signal to a printing unit.
Claim 17
Dependent Claim
25 words
An image processing apparatus according to claim 13, wherein the corrected pulse-width-modulated signal is transmitted to said printing unit in synchronism with a clock signal.
Claim 18
Dependent Claim
13 words
An image processing apparatus according to claim 13, further comprising said printing unit.
Claim 19
Dependent Claim
19 words
An image processing apparatus according to claim 13, wherein said printing unit carries out printing by an electrophotographic method.
Claim 20
Dependent Claim
30 words
An image processing apparatus according to claim 16, further comprising laser beam generating means for generating a laser beam modulated by the corrected pulse-width-modulated signal sent from said correction 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) | 1998-10-30 | 1999-05-01 | 1999-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-30 | 2003-05-01 | 2003-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-30 | 2007-05-01 | 2007-10-31 | $7700.00 | Window Closed / Lapsed |