EP0175962A1
Expired / Lapsed
EP
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Electrophotographic image forming apparatus
Assignee: Toshiba Corp
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Filing: 1985-09-02
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Granted: —
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Expires: 2005-09-02
Abstract
Abstract An image forming apparatus (1) is provided with a light emitting element (92) for indicating a specific range of an original (G) disposed on an original table (2), and the other light emitting elements (101) for erasing the electric charge on the surface of a photo-sensitive body (10) in response to the specific range of the original (G) indicated by the light emitting element (92). A spot light is applied to the original (G) on the original table (2) by the light emitting element (92), and moved to specify an erasure range. In image forming, a light beam is applied to a photosensitive body (10) in response to the specified erasure range to erase an electrostatic latent image or electric charge thereon by the other light emitting elements (101).
Inventors
- 👤 Junji C/O Patent Division Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 23:18
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/605; G03G15/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
173 words
An image forming apparatus comprising: a photosensitive body (10) holding electric charge on the surface thereof; ; charging means (11) for uniformly applying electric charge to the surface of the photosensitive body (10); an original table (2) adapted to carry an original (G) thereon; image exposure means (3) for exposing the surface of the photosensitive body (10) uniformly charged by the charging means (11) to an image of the original (G) on the original table (2), thereby forming an electric charge pattern responsive to the original image on the surface of the photosensitive body (10); and developing means (12) for developing the electric charge pattern on the surface of the photosensitive body (10) formed by the image exposure means (3), characterized by further comprising: indicating means (91) for indicating a specific range of the original (G) on the original table; and erasing means (100) for erasing the electric charge on the surface of the photosensitive body (10) in response to the specific range of the original (G) indicated by the indicating means (91).
Claim 2
Dependent Claim
173 words
An image forming apparatus comprising: a photosensitive body (10) holding electric charge on the surface thereof; ; charging means (11) for uniformly applying electric charge to the surface of the photosensitive body (10); an original table (2) adapted to carry an original (G) thereon; image exposure means (3) for exposing the surface of the photosensitive body (10) uniformly charged by the charging means (11) to an image of the original (G) on the original table (2), thereby forming an electric charge pattern responsive to the original image on the surface of the photosensitive body (10); and developing means (12) for developing the electric charge pattern on the surface of the photosensitive body (10) formed by the image exposure means (3), characterized by further comprising: indicating means (91) for indicating a specific range of the original (G) on the original table; and erasing means (100) for erasing the electric charge on the surface of the photosensitive body (10) in response to the specific range of the original (G) indicated by the indicating means (91).
Claim 3
Dependent Claim
37 words
The image forming apparatus according to claim 1, characterized in that said indicating means (91) includes light emitting means for applying a spot light to the original (G) on the original table (2) from under the same.
Claim 4
Dependent Claim
40 words
The image forming apparatus according to claim . 2, characterized in that said light emitting means (91) includes a light emitting element (92) emitting light of enough brightness to be transmitted through the original (G) on the original table (2).
Claim 5
Dependent Claim
88 words
The image forming apparatus according to claim 3, characterized in that said light emitting element (92) is disposed under the original table (2) so as to be movable along the same (2), and said indicating means (91) further includes moving means (33, 43, 44, 45, 94, 95, 96, 97) for moving the light emitting element (92) along the original table (2) and detecting means (98) for detecting the position of the light emitting element (92) moved by the moving means (33, 43, 44, 45, 94, 95, 96, 97).
Claim 6
Dependent Claim
74 words
The image forming apparatus according to claim 4, characterized in that said moving means (33, 43, 44, 45, 94, 95, 96, 97) includes first moving means (33, 43, 44, 45) for moving the light emitting element (92) in a first direction (X) along an original scanning direction (a) and second moving means (94, 95, 96, 97) for moving the light emitting element (92) in a second direction (Y) perpendicular to the first direction (X).
Claim 7
Dependent Claim
71 words
The image forming apparatus according to claim 5, characterized in that said indicating means (91) defines two spots (S 1 , 5 2 ) for the light emitting element (92) in accordance with the result of detection by the detecting means (98) so that the specific range is indicated by a rectangle a diagonal of which is coincident with a segment connecting the two spots (S 1 , S 2 ).
Claim 8
Dependent Claim
33 words
The image forming apparatus according to claim 6, characterized in that said rectangle has two sides parallel to the first direction (X) and its other two sides parallel to the second direction (Y).
Claim 9
Dependent Claim
55 words
The image forming apparatus according to claim 1, characterized in that said erasing means (100) includes another light emitting means opposed to the surface of the photosensitive body (10) and adapted to expose that portion of the surface of the photosensitive body (10) which corresponds to the specific range indicated by the indicating means (91).
Claim 10
Dependent Claim
48 words
The image forming apparatus according to claim 8, characterized in that said photosensitive body (10) is movable in one direction (C), and said second light emitting means (100) includes a plurality of second light emitting elements (10) arranged in the other direction perpendicular to the one direction (C).
Claim 11
Dependent Claim
38 words
The image forming apparatus according to claim 9, characterized in that said photosensitive body (10) includes a rotatable photosensitive drum, and said second light emitting elements (101) are arranged in the axial direction of the photosensitive drum (10).
Claim 12
Dependent Claim
30 words
The image forming apparatus according to claim 8, characterized in that said second light emitting elements (101) are arranged between the charging means (11) and the image exposure means (3).
Claim 13
Dependent Claim
30 words
The image forming apparatus according to claim 8, characterized in that said second light emitting elements (101) are arranged between the image exposure means (3) and the developing means (12).
References Cited (Backward Citations)
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