Patent US4511246A successfully refreshed from Google Patents.
US4511246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Size detecting device of a copy document suitable for electrophotographic copying machine
Assignee: Sharp Corp
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Filing: 1984-03-29
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Granted: 1985-04-16
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Expires: 2004-03-29
Abstract
Abstract An electrophotographic copying machine comprising a device for detecting the size of a copy document on a document table. The device includes a light receiving element which is responsive to the positioning of a copy document on a document table for providing document size signals. A control circuit is responsive to the document size signals for detecting the size of the copy document.
Inventors
- 👤 Haruo Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/607
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
172 words
A detecting device for detecting the size of a copy document for an electrophotographic copying machine comprising: document table means on which the copy document is placed; document cover means pivotally provided on the document tables means to cover the copy document; sensor means for sensing the size of the copy document on the document table means, the copy document being subjected to optical scanning; said sensor means comprising a light receiving element for receiving light and a light emitting element for emitting light; light reflecting means pivotably disposed between the document table means and the document cover means, whereby the angle of disposition of the light reflecting means can be varied independent of the document cover means,; said light emitting element of the sensor means emitting light toward the reflecting means and said light receiving element of the sensor means receiving light reflected by the reflecting means; and detection means responsive to the output of the light receiving element of the sensor means for detecting the size of the copy document.
Claim 2
Dependent Claim
172 words
A detecting device for detecting the size of a copy document for an electrophotographic copying machine comprising: document table means on which the copy document is placed; document cover means pivotally provided on the document tables means to cover the copy document; sensor means for sensing the size of the copy document on the document table means, the copy document being subjected to optical scanning; said sensor means comprising a light receiving element for receiving light and a light emitting element for emitting light; light reflecting means pivotably disposed between the document table means and the document cover means, whereby the angle of disposition of the light reflecting means can be varied independent of the document cover means,; said light emitting element of the sensor means emitting light toward the reflecting means and said light receiving element of the sensor means receiving light reflected by the reflecting means; and detection means responsive to the output of the light receiving element of the sensor means for detecting the size of the copy document.
Claim 3
Dependent Claim
22 words
The device of claim 1, wherein the light receiving element is a photodiode responsive to the incident light for generating a voltage.
Claim 4
Dependent Claim
15 words
The device of claim 1, wherein the light emitting element is a light emitting diode.
Claim 5
Dependent Claim
18 words
The device of claim 1, wherein the detection means comprises an operational amplifier means and a comparator means.
Claim 6
Dependent Claim
34 words
The device of claim 1, wherein the light receiving element of the sensor means is connected to an operational amplifier means and the output of the operational amplifier is applied to a comparator means.
Claim 7
Dependent Claim
13 words
The device of claim 1, wherein the detection means is a logic circuit.
Claim 8
Dependent Claim
30 words
The device of claim 1, wherein the light emitting element of the sensor means is tilted toward the document table means so as to provide tilting light toward the document.
Claim 9
Dependent Claim
22 words
The detecting device of claim 1, wherein the reflecting means is pivotally rotated with the document cover means at a dihedral angle.
Claim 10
Dependent Claim
15 words
The detecting device of claim 1, wherein the light reflecting means is free of color.
Claim 11
Dependent Claim
14 words
The detecting device of claim 9, wherein the light reflecting means is a mirror.
References Cited (Backward Citations)
US4338020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |