US5089901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image reading apparatus
Assignee: Ricoh Co Ltd
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Filing: 1989-01-19
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Granted: 1992-02-18
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Expires: 2009-01-19
Abstract
Abstract An image reading apparatus for reading an image of a document by dividing the image into a plurality of sections in the main scanning direction and causing independent solid-state imaging devices to read those image sections. A displacement of the document from a correct reading position is detected. An effective pixel area for reading of each of the imaging devices is varied on the basis of the detected displacement of the document.
Inventors
- 👤 Yutaka Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:33
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N25/00; H04N25/40; H04N25/41; H04N25/70; H04N25/701; H04N25/7013
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
182 words
An image reading apparatus for reading an image of a document, which is set in a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections and causing focusing lenses each being assigned to a respective one of the sections of the image to focus the section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: displacement detecting means for detecting a displacement of the document from the reading position; and correcting means for causing, in response to the detected displacement, the sections of the image to be individually focused on predetermined effective pixel range for reading of said imaging devices wherein said correcting means includes an effective pixel range varying means for varying the effective pixel range of each of said imaging devices and wherein said effective pixel range varying means includes a piezoelectric element connected between said imaging devices and expansible in association with the displacement of the document to move each of said imaging devices to thereby vary the effective pixel range.
Claim 2
Dependent Claim
182 words
An image reading apparatus for reading an image of a document, which is set in a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections and causing focusing lenses each being assigned to a respective one of the sections of the image to focus the section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: displacement detecting means for detecting a displacement of the document from the reading position; and correcting means for causing, in response to the detected displacement, the sections of the image to be individually focused on predetermined effective pixel range for reading of said imaging devices wherein said correcting means includes an effective pixel range varying means for varying the effective pixel range of each of said imaging devices and wherein said effective pixel range varying means includes a piezoelectric element connected between said imaging devices and expansible in association with the displacement of the document to move each of said imaging devices to thereby vary the effective pixel range.
Claim 3
Dependent Claim
30 words
An apparatus as claimed in claim 1, wherein said effective pixel range varying means comprises means for inhibiting an output from a range other than the predetermined effective pixel range.
Claim 4
Dependent Claim
48 words
An apparatus as claimed in claim 1, wherein said effective pixel range varying means comprises lens moving means for moving said focusing lenses in association with the displacement of the document to thereby vary positions on said imaging devices where the respective sections of the image are focused.
Claim 5
Dependent Claim
21 words
An apparatus as claimed in claim 3, wherein said lens moving means moves said focusing lenses in the main scanning direction.
Claim 6
Dependent Claim
22 words
An apparatus as claimed in claim 3, wherein said lens moving means moves said focusing lenses along optical axes of said lenses.
Claim 7
Dependent Claim
49 words
An apparatus as claimed in claim 1, wherein said effective pixel range varying means comprises imaging device moving means for moving said imaging devices in association with the displacement of the document to thereby vary positions on said imaging devices where the respective sections of the image are focused.
Claim 8
Dependent Claim
24 words
An apparatus as claimed in claim 6, wherein said imaging device moving means moves said imaging devices along optical axes of said focusing lenses.
Claim 9
Dependent Claim
158 words
An image reading apparatus for reading an image of a document, which is set at a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections, causing an illuminating device mounted on a first carriage to illuminate the respective sections, and causing two mirrors mounted on a second carriage perpendicularly to each other with respect to an optical path to reflect reflections from the sections while causing focusing lenses each being assigned to a respective one of the sections of the image to focus the associated section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: displacement detecting means for detecting a displacement of the document from the reading position; and second carriage moving means for moving said mirrors of said second carriage along said optical axis by an amount which is one half of the detected displacement of the document.
Claim 10
Dependent Claim
158 words
An image reading apparatus for reading an image of a document, which is set at a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections, causing an illuminating device mounted on a first carriage to illuminate the respective sections, and causing two mirrors mounted on a second carriage perpendicularly to each other with respect to an optical path to reflect reflections from the sections while causing focusing lenses each being assigned to a respective one of the sections of the image to focus the associated section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: displacement detecting means for detecting a displacement of the document from the reading position; and second carriage moving means for moving said mirrors of said second carriage along said optical axis by an amount which is one half of the detected displacement of the document.
Claim 11
Dependent Claim
117 words
An image reading apparatus for reading an image of a document, which is set in a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections and causing focusing lenses each being assigned to a respective one of the sections of the image to focus the section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: document sensing means for sensing one edge of the document; and a body for pressing, in response to a sense output of said document sensing means, a back surface of the document to accurately position the image of the document in the reading position.
Claim 12
Dependent Claim
117 words
An image reading apparatus for reading an image of a document, which is set in a reading position and formed in a main scanning direction of the document, by dividing the image into a plurality of sections and causing focusing lenses each being assigned to a respective one of the sections of the image to focus the section onto a respective one of solid-state imaging devices in a reduced scale, said apparatus comprising: document sensing means for sensing one edge of the document; and a body for pressing, in response to a sense output of said document sensing means, a back surface of the document to accurately position the image of the document in the reading position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |