Patent JPS5344874A successfully refreshed from Google Patents.
Patent US4992888A successfully refreshed from Google Patents.
US4992888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image reading apparatus using a motor and controlling driving pulses supplied to the motor
Assignee: Canon Inc
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Filing: 1986-10-10
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Granted: 1991-02-12
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Expires: 2006-10-10
Abstract
Abstract An image reading apparatus which is capable of arbitrarily varying the image magnification, utilizing a line image sensor. The sensor is moved by a stepping motor, the phase of which is controlled by the synchronization signal of the line image sensor. For example, the frequency of the pulses may be controlled, or the number of pulses supplied may be converted on the basis of an error between the number which were to be supplied and the number actually supplied.
Inventors
- 👤 Nao Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/0473; H04N1/387; H04N1/393; H04N1/10; H04N1/1013; H04N1/1017; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02439; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/04734; H04N2201/04748; H04N2201/04753; H04N2201/04755; H04N2201/04794
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
151 words
An image reading apparatus comprising: charge-accumulating image reading means for reading an original image, said image reading means periodically repeating a charge accumulating operation; moving means for moving an image reading position of said image reading means with a stepping motor; determining means for determining plural sets of numbers of pulses to be supplied to said stepping motor according to an image reading magnification or an image reading density with which said image reading means is to read said original image; and selecting means for selecting one of the plural sets of numbers of pulses in accordance with the progress of the charge accumulating operation of said image reading means; and supplying means for supplying pulses to said stepping motor, said supplying means supplying the number of pulses in a selected one of the plural sets to said stepping motor during a respective charge accumulating operation of said image reading means.
Claim 2
Dependent Claim
151 words
An image reading apparatus comprising: charge-accumulating image reading means for reading an original image, said image reading means periodically repeating a charge accumulating operation; moving means for moving an image reading position of said image reading means with a stepping motor; determining means for determining plural sets of numbers of pulses to be supplied to said stepping motor according to an image reading magnification or an image reading density with which said image reading means is to read said original image; and selecting means for selecting one of the plural sets of numbers of pulses in accordance with the progress of the charge accumulating operation of said image reading means; and supplying means for supplying pulses to said stepping motor, said supplying means supplying the number of pulses in a selected one of the plural sets to said stepping motor during a respective charge accumulating operation of said image reading means.
Claim 3
Dependent Claim
35 words
An image reading apparatus according to claim 1, wherein said determining means comprises first generator means for generating pulses of a first frequency and second generator means for generating pulses of a different second frequency.
Claim 4
Dependent Claim
37 words
An image reading apparatus according to claim 2, wherein said selecting means selects either one of said first and second generator means in accordance with the progress of the charge accumulating operation of said image reading means.
Claim 5
Dependent Claim
37 words
An image reading apparatus according to claim 1, wherein said supplying means is adapted to control phase of the pulses supplied to said stepping motor in synchronization with the charge accumulating operation of said image reading means.
Claim 6
Dependent Claim
39 words
An image reading apparatus according to claim 1, wherein said moving means is adapted to move the image reading position of said image reading means by an amount corresponding to the number of pulses supplied to said stepping motor.
Claim 7
Dependent Claim
19 words
An image reading apparatus according to claim 1, wherein said image reading means comprises a contact-type linear image sensor.
Claim 8
Dependent Claim
22 words
An image reading apparatus according to claim 1, wherein said image reading means repeats the charge accumulating operation at a predetermined period.
Claim 9
Dependent Claim
83 words
An image reading apparatus comprising: image reading means for reading an original image; moving means for moving an image reading position of said image reading means with a stepping motor; and control means for controlling a number of pulses supplied to said stepping motor according to a cumulative error between a number of pulses which must be supplied to said stepping motor for moving the image reading position by a predetermined amount and the number of pulses actually supplied to said stepping motor.
Claim 10
Dependent Claim
83 words
An image reading apparatus comprising: image reading means for reading an original image; moving means for moving an image reading position of said image reading means with a stepping motor; and control means for controlling a number of pulses supplied to said stepping motor according to a cumulative error between a number of pulses which must be supplied to said stepping motor for moving the image reading position by a predetermined amount and the number of pulses actually supplied to said stepping motor.
Claim 11
Dependent Claim
35 words
An image reading apparatus according to claim 8, wherein said control means comprises first generator means for generating pulses of a first frequency and second generator means for generating pulses of a different second frequency.
Claim 12
Dependent Claim
39 words
An image reading apparatus according to claim 8, wherein said moving means is adapted to move the image reading position of said image reading means by an amount corresponding to the number of pulses supplied to said stepping motor.
Claim 13
Dependent Claim
48 words
An image reading apparatus according to claim 8, wherein said control means is adapted to control the number of pulses supplied to said stepping motor according to an image reading magnification or an image reading density with which said image reading means is to read said original image.
Claim 14
Dependent Claim
18 words
An image reading apparatus according to claim 8, wherein said image reading means comprises a charge-accumulating image sensor.
Claim 15
Dependent Claim
22 words
An image reading apparatus according to claim 12, wherein said image reading means repeats a charge accumulating operation at a predetermined period.
Claim 16
Dependent Claim
143 words
An image reading apparatus comprising: charge-accumulating image reading means for reading an original image, said image reading means periodically repeating a charge accumulating operation; moving means for moving an image reading position of said image reading means with a stepping motor; determining means for determining plural frequencies of pulses to be supplied to said stepping motor according to an image reading magnification or an image reading density with which said image reading means is to read said original image; selecting means for selecting one of the plural frequencies of pulses in accordance with the progress of the charge accumulating operating of said image reading means; and supplying means for supplying pulses to said stepping motor, said supplying means supplying pulses having a selecting one of the plural frequencies to said stepping motor during a respective charge accumulating operation of said image reading means.
Claim 17
Dependent Claim
143 words
An image reading apparatus comprising: charge-accumulating image reading means for reading an original image, said image reading means periodically repeating a charge accumulating operation; moving means for moving an image reading position of said image reading means with a stepping motor; determining means for determining plural frequencies of pulses to be supplied to said stepping motor according to an image reading magnification or an image reading density with which said image reading means is to read said original image; selecting means for selecting one of the plural frequencies of pulses in accordance with the progress of the charge accumulating operating of said image reading means; and supplying means for supplying pulses to said stepping motor, said supplying means supplying pulses having a selecting one of the plural frequencies to said stepping motor during a respective charge accumulating operation of said image reading means.
Claim 18
Dependent Claim
35 words
An image reading apparatus according to claim 14, wherein said determining means comprises first generator means for generating pulses of a first frequency and second generator means for generating pulses of a different second frequency.
Claim 19
Dependent Claim
37 words
An image reading apparatus according to claim 15, wherein said selecting means selects either one of said first and second generator means in accordance with the progress of the charge accumulating operation of said image reading means.
Claim 20
Dependent Claim
38 words
An image reading apparatus according to claim 15, wherein said supplying means is adapted to control a phase of the pulses supplied to said stepping motor in synchronism with the charge accumulating operation of said image reading means.
Claim 21
Dependent Claim
39 words
An image reading apparatus according to claim 14, wherein said moving means is adapted to move the image reading position of said image reading means by an amount corresponding to the number of pulses supplied to said stepping motor.
Claim 22
Dependent Claim
19 words
An image reading apparatus according to claim 14, wherein said image reading means comprises a contact-type linear image sensor.
Claim 23
Dependent Claim
22 words
An image reading apparatus according to claim 14, wherein said image reading means repeats the charge accumulating operation at a predetermined period.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |