US4958240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Original reading apparatus applying a lamp voltage to correct lamp blackening
Assignee: Canon Inc
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Filing: 1988-05-25
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Granted: 1990-09-18
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Expires: 2008-05-25
Abstract
Abstract An original reading apparatus which prevents lamp blackening includes a lamp for illuminating the original, and reading circuitry for reading an image formed on the illuminated original. Control circuitry is provided to apply to the lamp a first predetermined voltage after reading the image formed on the original has been completed, if a voltage applied to the lamp at the time of original image reading is lower than a second predetermined voltage. The first predetermined voltage is higher than the voltage applied to the lamp at the time of the original image reading.
Inventors
- 👤 Shunichi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:08
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00249; H04N1/00267; H04N1/04; H04N1/10; H04N1/1013; H04N1/1017; H04N1/1039; H04N1/1043; H04N1/1048; H04N1/40; H04N1/40056; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0404; H04N2201/0418; H04N2201/0438
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
An original reading apparatus comprising: a lamp for illuminating an original; reading means for reading an image formed on the original illuminated by said lamp; and control means adapted to apply to said lamp a first predetermined voltage after reading of the image formed on the original has been completed, if a voltage applied to said lamp at the time of the original image reading is lower than a second predetermined voltage, said first predetermined voltage being higher than said voltage applied to said lamp at the time of the original image reading.
Claim 2
Dependent Claim
93 words
An original reading apparatus comprising: a lamp for illuminating an original; reading means for reading an image formed on the original illuminated by said lamp; and control means adapted to apply to said lamp a first predetermined voltage after reading of the image formed on the original has been completed, if a voltage applied to said lamp at the time of the original image reading is lower than a second predetermined voltage, said first predetermined voltage being higher than said voltage applied to said lamp at the time of the original image reading.
Claim 3
Dependent Claim
27 words
An original reading apparatus according to claim 1, wherein said first predetermined voltage is set to a level at which said lamp can be prevented from blackening.
Claim 4
Dependent Claim
77 words
An original reading apparatus according to claim 1 or claim 2, wherein said control means applies a reference voltage to said lamp before the operation of reading the image from the original is started, and said control means determines the voltage applied to said lamp at the time of the original image reading on the basis of information on density of the original measured when the original is illuminated by said lamp lighted at said reference voltage.
Claim 5
Dependent Claim
15 words
An original reading apparatus according to claim 3, wherein said lamp includes a halogen lamp.
Claim 6
Dependent Claim
16 words
An original reading apparatus according to claim 4, wherein the original is of a transmission type.
Claim 7
Dependent Claim
86 words
An original reading apparatus comprising: a lamp for illuminating a transmission type of original; reading means for reading an image formed on the original illuminated by said lamp; means for forming a signal for discriminating whether the original to be read is a positive original or a negative original; and control means adapted to apply to said lamp a predetermined voltage for a predetermined period of time after reading of the image formed on the original has been completed, if the original is a positive original.
Claim 8
Dependent Claim
86 words
An original reading apparatus comprising: a lamp for illuminating a transmission type of original; reading means for reading an image formed on the original illuminated by said lamp; means for forming a signal for discriminating whether the original to be read is a positive original or a negative original; and control means adapted to apply to said lamp a predetermined voltage for a predetermined period of time after reading of the image formed on the original has been completed, if the original is a positive original.
Claim 9
Dependent Claim
26 words
An original reading apparatus according to claim 6, wherein said predetermined voltage is set to a level at which said lamp can be prevented from blackening.
Claim 10
Dependent Claim
77 words
An original reading apparatus according to claim 6 or claim 7, wherein said control means applies a reference voltage to aid lamp before the operation of reading the image from the original is started, and said control means determines a voltage applied to said lamp at the time of the original image reading on the basis of information on density of the original measured when the original is illuminated by said lamp lighted at said reference voltage.
Claim 11
Dependent Claim
18 words
An original reading apparatus according to claim 6 or claim 7, wherein said lamp includes a halogen lamp.
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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |