Patent FR466782A successfully refreshed from Google Patents.
Patent US672143A successfully refreshed from Google Patents.
EP0403311A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A recording sheet for use in image forming apparatus, a method and an apparatus for forming an image
Assignee: Canon Inc
•
Filing: 1990-06-15
•
Granted: —
•
Expires: 2010-06-15
Abstract
Abstract The present invention provides a recording sheet used with an image forming apparatus comprising: an optical functional portion disposed along at least one edge of the recording sheet and arranged asymmetrically with respect to a center of the edge and having a functional feature regarding light different from that of an image forming portion of the recording sheet. Such optical functional portion can be used to provide a machine detectable indication of the surface, being either front or back surface, presented. A compatible image forming apparatus and its operation are described.
Inventors
- 👤 Tatsuo C/O Canon Kabushiki Kaisha Takeuchi
- 👤 Koji C/O Canon Kabushiki Kaisha Amemiya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 21:30
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6588; G03G15/6591; G03G7/00; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00371; G03G2215/00443; G03G2215/00493; G03G2215/00497; G03G2215/00523
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
54 words
A recording sheet used with an image forming apparatus, comprising: an optical functional portion disposed along at least one edge of the recording sheet and arranged asymmetrically with respect to a center of said edge and having a functional feature regarding light different from that of an image forming portion of the recording sheet.
Claim 2
Dependent Claim
54 words
A recording sheet used with an image forming apparatus, comprising: an optical functional portion disposed along at least one edge of the recording sheet and arranged asymmetrically with respect to a center of said edge and having a functional feature regarding light different from that of an image forming portion of the recording sheet.
Claim 3
Dependent Claim
29 words
A recording sheet according to Claim 1, wherein a front surface of the recording sheet has a feature different from that of a back surface of the recording sheet.
Claim 4
Dependent Claim
27 words
A recording sheet according to Claim 2, wherein said optical functional portion is detected in order to determine the front and back surfaces of the recording sheet.
Claim 5
Dependent Claim
19 words
A recording sheet according to Claim 2, wherein said front surface of the recording sheet is coated by resin.
Claim 6
Dependent Claim
15 words
A recording sheet according to Claim 1, wherein said recording sheet comprises a rectangular sheet.
Claim 7
Dependent Claim
24 words
A recording sheet according to Claim 1, wherein said recording sheet comprises a transparent sheet, and said optical functional portion comprises an opaque portion.
Claim 8
Dependent Claim
15 words
A recording sheet according to Claim 1, wherein said recording sheet comprises an OHP film.
Claim 9
Dependent Claim
24 words
A recording sheet according to Claim 6, wherein said opaque portion cuts the light from a detecting light source by 60 % or more.
Claim 10
Dependent Claim
24 words
A recording sheet according to Claim 6, wherein said opaque portion reflects the light from a detecting light source by 60 % or more.
Claim 11
Dependent Claim
21 words
A recording sheet according to Claim 1, wherein said optical functional portions are disposed along two edges of the recording sheet.
Claim 12
Dependent Claim
24 words
A recording sheet according to Claim 10, wherein said two edges along which said optical functional portions are disposed are perpendicular to each other.
Claim 13
Independent Claim
88 words
A method for forming an image, comprising the steps of: a first step for feeding a recording sheet having a detecting portion disposed along at least one edge thereof and arranged asymmetrically with respect to a center of said edge: a second step for detecting said detecting portion of the recording sheet to be fed, by means of a detecting means; and a third step for permitting or prohibiting the formation of an image on the recording sheet, on the basis of an output from said detecting means.
Claim 14
Independent Claim
88 words
A method for forming an image, comprising the steps of: a first step for feeding a recording sheet having a detecting portion disposed along at least one edge thereof and arranged asymmetrically with respect to a center of said edge: a second step for detecting said detecting portion of the recording sheet to be fed, by means of a detecting means; and a third step for permitting or prohibiting the formation of an image on the recording sheet, on the basis of an output from said detecting means.
Claim 15
Dependent Claim
23 words
A method for forming an image according to Claim 12, wherein said detecitng means detects front and back surfaces of the recording sheet.
Claim 16
Dependent Claim
51 words
A method for forming an image according to Claim 13, wherein when the front surface of the recording sheet is detected the image is recorded on the recording sheet and when the back surface of the recording sheet is detected the recording of the image on the recording sheet is prohibited.
Claim 17
Dependent Claim
32 words
A method for forming an image according to Claim 12, wherein the front surface of the recording sheet has a feature different from that of the back surface of the recording sheet.
Claim 18
Dependent Claim
22 words
A method for forming an image according to Claim 15, wherein said front surface of the recording sheet is coated by resin.
Claim 19
Dependent Claim
40 words
A method for forming an image according to Claim 12, wherein said detecting means is arranged in a position where it is not overlapped with a center line of the recording sheet which is parallel to a sheet feeding direction.
Claim 20
Dependent Claim
28 words
A method for forming an image according to Claim 12, wherein said detecting means comprises an optical detecting means having a luminous portion and a light receiving portion.
Claim 21
Dependent Claim
26 words
A method for forming an image according to Claim 12, wherein said recording sheet is a transparent sheet, and said detecting portion comprises an opaque portion.
Claim 22
Dependent Claim
18 words
A method for forming an image according to Claim 12, wherein said recording sheet is an OHP film.
Claim 23
Dependent Claim
27 words
A method for forming an image according to Claim 19, wherein said opaque portion cuts the light from a detecting light source by 60 % or more.
Claim 24
Dependent Claim
27 words
A method for forming an image according to Claim 19, wherein said opaque portion reflects the light from a detecting light source by 60 % or more.
Claim 25
Dependent Claim
18 words
A method for forming an image according to Claim 12, wherein said recording sheet comprises a rectangular sheet.
Claim 26
Dependent Claim
23 words
A method for forming an image according to Claim 23, wherein said detecting portions are disposed along two edges of the recording sheet.
Claim 27
Dependent Claim
26 words
A method for forming an image according to Claim 24, wherein said two edges along which said detecting portions are disposed are perpendicular to each other.
Claim 28
Dependent Claim
121 words
An image forming apparatus comprising: an image forming means for forming an image on a recording sheet having partially a detecting portion for detecting the recording sheet at an end disposed in a sheet feeding direction a detecting sensor for detecting the recording sheet; said detecting sensor being arranged in a position where it detects said detecting portion when a first surface of the recording sheet is directed upwardly and does not detect said detecting portion when a second surface of the recording sheet is directed upwardly; and wherein permission or prohibition of the formation of the image on the recording sheet by means of said image forming means is determined on the basis of an output from said detecting sensor.
Claim 29
Dependent Claim
121 words
An image forming apparatus comprising: an image forming means for forming an image on a recording sheet having partially a detecting portion for detecting the recording sheet at an end disposed in a sheet feeding direction a detecting sensor for detecting the recording sheet; said detecting sensor being arranged in a position where it detects said detecting portion when a first surface of the recording sheet is directed upwardly and does not detect said detecting portion when a second surface of the recording sheet is directed upwardly; and wherein permission or prohibition of the formation of the image on the recording sheet by means of said image forming means is determined on the basis of an output from said detecting sensor.
Claim 30
Dependent Claim
23 words
An image forming apparatus according to Claim 26, wherein said first surface of the recording sheet is a back regarding said second surface.
Claim 31
Dependent Claim
21 words
An image forming apparatus according to Claim 27, wherein said detecting sensor detects front and back surfaces of the recording sheet.
Claim 32
Dependent Claim
49 words
An image forming apparatus according to Claim 28, wherein when the front surface of the recording sheet is detected the image is recorded on the recording sheet and when the back surface of the recording sheet is detected the recording of the image on the recording sheet is prohibited.
Claim 33
Dependent Claim
34 words
An image forming apparatus according to Claim 26, wherein said detecting portion is disposed along at least one edge of the recording sheet an arranged asymmetrically with respect to a center of said edge.
Claim 34
Dependent Claim
30 words
An image forming apparatus according to Claim 27, wherein the front surface of the recording sheet has a feature different from that of the back surface of the recording sheet.
Claim 35
Dependent Claim
20 words
An image forming apparatus according to Claim 31, wherein said front surface of the recoridng sheet is coated by resin.
Claim 36
Dependent Claim
38 words
An image forming apparatus according to Claim 26, wherein said detecting sensor is arranged in a portion where it is not overlapped with a center line of the recording sheet which is parallel to a sheet feeding direction.
Claim 37
Dependent Claim
26 words
An image forming apparatus according to Claim 26, wherein said detecting sensor comprises an optical detecting sensor having a luminous portion and a light receiving portion.
Claim 38
Dependent Claim
24 words
An image forming apparatus according to Claim 26, wherein said recording sheet is a transparent sheet, and said detecting portion comprises an opaque portion.
Claim 39
Dependent Claim
16 words
An image forming apparatus according to Claim 26, wherein said recording sheet is an OHP film.
Claim 40
Dependent Claim
25 words
An image forming apparatus according to Claim 35, wherein said opaque portion cuts the light from a detecting light source by 60 % or more.
Claim 41
Dependent Claim
25 words
An image forming apparatus according to Claim 35, wherein said opaque portion reflects the light from a detecting light source by 60 % or more.
Claim 42
Dependent Claim
16 words
An image forming apparatus according to Claim 26, wherein said recording sheet comprises a rectangular sheet.
Claim 43
Dependent Claim
21 words
An image forming apparatus according to Claim 39, wherein said detecting portions are disposed along two edges of the recording sheet.
Claim 44
Dependent Claim
24 words
An image forming apparatus according to Claim 40, wherein said two edges along which said detecting portions are disposed are perpendicular to each other.
Claim 45
Dependent Claim
26 words
An image forming apparatus according to Claim 26, wherein said image forming means can form an image on the recording sheet with a plurality of colors.
Claim 46
Dependent Claim
33 words
An image forming apparatus according to Claim 42, wherein said a full-color image can be formed by superimposing plural color toner images on the recording sheet, by means of said image forming means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.