US5004928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing method in which both sides of the recording sheet are inspected and apparatus therefor
Assignee: Canon Inc
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Filing: 1989-04-13
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Granted: 1991-04-02
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Expires: 2009-04-13
Abstract
Abstract According to a method and apparatus for detecting a kind of a recording sheet, a light source for emitting a beam on the recording sheet and a photosensitive element for detecting an amount of beam are used. The photosensitive elements located at predetermined positions are caused to detect amounts of beams reflected by upper and lower surfaces of the recording sheet. The kind of upper or lower surface of the recording sheet is discriminated on the basis of a difference between the amounts of beams reflected by the upper and lower surfaces or one of the amounts of beams.
Inventors
- 👤 Akio Suzuki
- 👤 Yoshihiro Takada
- 👤 Masami Izumizaki
- 👤 Toshimitsu Danzuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:38
CPC Classifications
B; B41; B41J; B41J29/00; G; G01; G01N; G01N21/00; G01N21/84; G01N21/86; G01N21/17; G01N21/55
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A printing apparatus comprising: printing means for forming an image on a recording sheet; means for detecting an upper or lower surface of the recording sheet; and means for determining, according to a detection result of said detecting means, a recording enable state when the upper and lower surfaces of the recording sheet are properly set and a recording disable state when the upper and lower surfaces of the recording sheet are reversed.
Claim 2
Dependent Claim
73 words
A printing apparatus comprising: printing means for forming an image on a recording sheet; means for detecting an upper or lower surface of the recording sheet; and means for determining, according to a detection result of said detecting means, a recording enable state when the upper and lower surfaces of the recording sheet are properly set and a recording disable state when the upper and lower surfaces of the recording sheet are reversed.
Claim 3
Dependent Claim
80 words
A printing apparatus comprising: printing means for forming an image on a recording sheet; means for designating different printing modes; means for detecting an upper or lower surface of the recording sheet or a type of the recording sheet; and means for determining whether or not the surface of the recording sheet or the type of the recording sheet is proper in a mode designated by said mode designating means in accordance with a detection result of said detecting means.
Claim 4
Dependent Claim
80 words
A printing apparatus comprising: printing means for forming an image on a recording sheet; means for designating different printing modes; means for detecting an upper or lower surface of the recording sheet or a type of the recording sheet; and means for determining whether or not the surface of the recording sheet or the type of the recording sheet is proper in a mode designated by said mode designating means in accordance with a detection result of said detecting means.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 1, further including input means for allowing printing even if the surface of the recording sheet is improper.
Claim 6
Dependent Claim
39 words
An apparatus according to claim 2, further including input means for allowing printing even if the surface of the recording sheet or the type of the recording sheet is improper in a mode designated by said mode designating means.
Claim 7
Dependent Claim
37 words
An apparatus according to claim 1, further including input means for allowing printing even if the surface of the recording sheet is improper and outputting a message representing that the surface of the recording sheet is improper.
Claim 8
Dependent Claim
51 words
An apparatus according to claim 2, further including input means for allowing printing even if the surface of the recording sheet or the type of the recording sheet is improper and outputting a message representing that the surface of the recording sheet or the type of the recording sheet is improper.
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) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |