Patent US4737819A successfully refreshed from Google Patents.
US4737819A
Expired / Lapsed
US
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Light exposure lamp having abnormal condition monitor
Assignee: Sharp Corp
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Filing: 1986-02-27
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Granted: 1988-04-12
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Expires: 2006-02-27
Abstract
Abstract An abnormal condition detection device for an automatically controlled light scanning device includes a light exposure lamp for emitting light toward an original mounted on an original table, a reflection plate for reflecting light from at least a portion of the original table, a sensor for receiving light reflected from the reflection plate, a plurality of comparators for detecting the amount of light received by the sensor, and a detection circuit for determining whether or not the amount of light detected by the comparators is within a predetermined normal range.
Inventors
- 👤 Akihiko Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:46
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/80; G03G; G03G15/00; G03G15/04; G03G15/043
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
An abnormal condition detection device for an automatically controlled light scanning device, said detection device comprising: a light exposure lamp for emitting light toward an original mounted on an original table; means for reflecting light from at least a portion of said original table; sensor means for receiving light reflected from said at least a portion of said original table; means for detecting an amount of light received by said sensor means, said means for detecting including a plurality of comparator means for providing a signal representative of a level of light received by said sensor means, said plurality of comparators having reference voltages applied thereto corresponding to maximum, average, and minimum values of light; means, responsive to said means for detecting, for determining whether or not the level of light detected is within a predetermined normal range; and means for initiating an abnormal recovery routine or a normal routine in said automatically controlled light scanning device in response to said means for determining.
Claim 2
Dependent Claim
164 words
An abnormal condition detection device for an automatically controlled light scanning device, said detection device comprising: a light exposure lamp for emitting light toward an original mounted on an original table; means for reflecting light from at least a portion of said original table; sensor means for receiving light reflected from said at least a portion of said original table; means for detecting an amount of light received by said sensor means, said means for detecting including a plurality of comparator means for providing a signal representative of a level of light received by said sensor means, said plurality of comparators having reference voltages applied thereto corresponding to maximum, average, and minimum values of light; means, responsive to said means for detecting, for determining whether or not the level of light detected is within a predetermined normal range; and means for initiating an abnormal recovery routine or a normal routine in said automatically controlled light scanning device in response to said means for determining.
Claim 3
Dependent Claim
40 words
The detection device according to claim 1, wherein said means for detecting an amount of light received by said sensor means is further for determining whether or not said light exposure lamp is illuminated during a predetermined exposure time period.
Claim 4
Dependent Claim
24 words
The detection device according to claim 1, wherein said means for detecting is operative during a predetermined time period required for a copying cycle.
Claim 5
Dependent Claim
30 words
The detection device according to claim 3, wherein said predetermined time period includes a preliminary period of light scanning for scanning said at least a portion of said original table.
Claim 6
Dependent Claim
32 words
The detection device according to claim 1, wherein said abnormal recovery routine is selected if the level of light detected by said means for detecting is outside of said predetermined normal range.
Claim 7
Dependent Claim
25 words
The detection device according to claim 1, wherein said normal routine is selected if the level of light detected is within said predetermined normal range.
References Cited (Backward Citations)
US2956487A
Cited
US4124294A
Cited
US3995959A
Cited
US4215930A
Cited
US4239374A
Cited
JPS5915263A
Cited
US4640603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |