Patent US4816845A successfully refreshed from Google Patents.
US4816845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus having a stepping motor with selectively excited coils
Assignee: Canon Inc
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Filing: 1987-12-28
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Granted: 1989-03-28
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Expires: 2007-12-28
Abstract
Abstract An image forming apparatus includes an recording medium, a beam radiating unit for radiating a beam to form an image on the recording medium, and a drive unit for driving the recording medium, wherein the drive unit has a stepping motor for performing a step operation of the recording medium.
Inventors
- 👤 Takashi Soya
- 👤 Junichi Kimizuka
- 👤 Toshihiko Inuyama
- 👤 Yasutaka Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:19
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1219
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
An image forming apparatus comprising: a recording medium; beam radiating means for radiating a beam to form an image on said recording medium; and drive means for driving said recording medium; wherein said drive means comprises a stepping motor for performing a step operation of said recording medium and an exciting circuit for exciting said stepping motor, said stepping motor being provided with a plurality of exciting coils, means whereby said exciting circuit gradually switches an output thereof into said exciting coils for each step operation of said stepping motor.
Claim 2
Dependent Claim
90 words
An image forming apparatus comprising: a recording medium; beam radiating means for radiating a beam to form an image on said recording medium; and drive means for driving said recording medium; wherein said drive means comprises a stepping motor for performing a step operation of said recording medium and an exciting circuit for exciting said stepping motor, said stepping motor being provided with a plurality of exciting coils, means whereby said exciting circuit gradually switches an output thereof into said exciting coils for each step operation of said stepping motor.
Claim 3
Dependent Claim
44 words
An image forming apparatus according to claim 1 further comprising detection means for detecting a scan position of a beam radiated by said beam radiating means, wherein said drive means drives said recording medium in accordance with a detection output from said detection means.
Claim 4
Dependent Claim
28 words
An image forming apparatus according to claim 2, wherein image data is applied to said beam radiating means in accordance with said detection output from said detection means.
Claim 5
Dependent Claim
30 words
An image forming apparatus according to claim 3, wherein said beam radiating means comprises a semiconductor laser and deflection means for deflecting and scanning said beam onto said recording medium.
Claim 6
Dependent Claim
16 words
An image forming apparatus according to claim 4, wherein said recording medium is a photosensitive drum.
Claim 7
Dependent Claim
126 words
An image forming apparatus comprising: a recording medium; beam irradiating means for radiating a beam to form an image on said recording medium; drive means for driving said recording medium; and detection means for detecting a scanning position of said beam radiated from said beam radiating means; wherein a beam radiating operation by said beam radiating means and a drive operation of said recording medium by said drive means are controlled in accordance with a detection output from said detection means, said drive means comprising a stepping motor provided with a plurality of exciting coils and an exciting circuit for exciting said exciting coils, means whereby said exciting circuit gradually switches an output thereof into said exciting coils for each step operation of said stepping motor.
Claim 8
Dependent Claim
126 words
An image forming apparatus comprising: a recording medium; beam irradiating means for radiating a beam to form an image on said recording medium; drive means for driving said recording medium; and detection means for detecting a scanning position of said beam radiated from said beam radiating means; wherein a beam radiating operation by said beam radiating means and a drive operation of said recording medium by said drive means are controlled in accordance with a detection output from said detection means, said drive means comprising a stepping motor provided with a plurality of exciting coils and an exciting circuit for exciting said exciting coils, means whereby said exciting circuit gradually switches an output thereof into said exciting coils for each step operation of said stepping motor.
Claim 9
Dependent Claim
28 words
An image forming apparatus according to claim 6, wherein image data is applied to said beam radiating means in synchronism with said detection output from said detection means.
Claim 10
Dependent Claim
32 words
An image forming apparatus according toclaim 7, wherein said exciting circuit gradually switches an output thereof into each of said exciting coils whenever a detection output is inputted from said detection means.
Claim 11
Dependent Claim
91 words
An image forming apparatus comprising: a recording medium; image forming means for forming an image onto said recording medium; and drive means for driving said recording medium; wherein said image forming means performs an image forming operation while said recording medium is stationary, and said drive means comprises a stepping motor provided with a plurality of exciting coils and an exciting circuit for exciting said exciting coils, means whereby said exciting circuit gradually switches an output thereof into each of said exciting coils for each step operation of said stepping motor.
Claim 12
Dependent Claim
91 words
An image forming apparatus comprising: a recording medium; image forming means for forming an image onto said recording medium; and drive means for driving said recording medium; wherein said image forming means performs an image forming operation while said recording medium is stationary, and said drive means comprises a stepping motor provided with a plurality of exciting coils and an exciting circuit for exciting said exciting coils, means whereby said exciting circuit gradually switches an output thereof into each of said exciting coils for each step operation of said stepping motor.
Claim 13
Dependent Claim
26 words
An image forming apparatus according to claim 1, wherein said beam radiation means forms an image on said recording medium when said recording medium is stationary.
Claim 14
Dependent Claim
33 words
An image forming apparatus according to clam 2, wherein said exciting circuit gradually switches supply of an output thereof into each exciting coil whenever a detection output is inputted from said detection means.
Claim 15
Dependent Claim
33 words
An image forming apparatus according to clam 2, wherein said exciting circuit gradually switches supply of an output thereof into each exciting coil whenever a detection output is inputted from said detection means.
Claim 16
Dependent Claim
26 words
An image forming apparatus according to claim 6, wherein said beam radiation means forms an image on said recording medium when said recording medium is stationary.
References Cited (Backward Citations)
JPS5794711A
Cited
US4578689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |