Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
2000-02-22
2002-04-30
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
C347S105000, C106S032500, C015S256510, C434S411000
Reexamination Certificate
active
06379001
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image display apparatus and an image erasing method, in which a color image made of an ink can be displayed on a recording medium by fixing the ink on the recording medium, and, when it is desired to erase the color image, the color image on the recording medium can be erased by image erasing means.
2. Related Background Art
In recent years, as global environment problems, attention is attracted to the reduction of the waste and the resource usage, and important task is to reduce the waste of recording media, such as papers, plastic films for overhead projector (OHP) and the like, as well as the usage of the materials for the recording media, such as wood resources, petroleum and the like. As a part of measures to the reduction of the resource usage, the reuse of the papers and the like as waste papers, which are used once, without disposal of them is progressing. However, the plastic films for OHP and the like are almost not recovered, and further, there are many problems about the recovery and reuse of these films. Specifically, for example, with respect to the recovery, there are problems about the labor for the dividing operation in accordance with the types of the recording media and the operation cost required for the recovery, as well as the collection place and the control for the recovered materials. With respect to the reuse, there are problems about the quality of the reproduced products and the cost required for the deinking treatment of the ink and the like.
An information board or an electronic blackboard is an image display device which has solved the above-mentioned problems. Specifically, this image display device is a device in which the image recorded once on the recording medium can be erased, an image can be recorded on the recording medium repeatedly, and the image recorded can be erased repeatedly. Such an image display device is one which is effective for the resource-saving because a recording medium is not consumed uselessly, and utilized for various purposes.
In general, an information board or an electronic blackboard is an image display device for displaying a static image on a large display. The information board is an image display device for displaying the image formed by an input device, such as a computer or the like, on a recording medium, mainly for the purpose of advertisement, propaganda, notice and the like. For example, this is a device which functions as a guide plate, in station precincts, for displaying information, such as the destination of a train, the operation state and the like; functions as a program table, at the entrance of a meeting room and in a wedding hall, for displaying the program; and functions as a notice plate, in a university, for displaying information, such as cancellation of lectures, changing of a lecture room and the like. Further, the electronic blackboard is a device used in a conference, a meeting or the like, in which an image, such as a character, a figure or the like, written on a recording medium (hereinafter, referred to also as display sheet) is read by a scanner and copied, and then, the image can be erased by means of a blackboard eraser.
Herein, the above-mentioned information board and electronic blackboard are explained in detail.
First, with respect to the information board, in the conventional information board in which a static image is recorded and displayed on the recording medium and erased as mentioned above, a toner image is formed by allowing a conductive magnetic toner to electrostatically adsorb onto an endless sheet (recording medium) in a belt form utilizing a magnestylus technique. The toner image is displayed by moving the sheet, and, after the display, the toner image is erased by removing the static electricity between the toner and the sheet.
FIG. 11
is a cross-sectional view of the conventional information board. In addition,
FIG. 12
is a partially sectional view of the recording medium used in the conventional information board. Using FIG.
11
and
FIG. 12
, the conventional information board is explained.
In
FIG. 11
,
801
designates a recording electrode,
802
designates a conductive magnetic toner, and
803
designates a recording medium. Recording medium
803
, as shown in
FIG. 12
, comprises surface dielectric layer
901
a
, resistance layer
901
b
, conductive layer
901
c
, and supporting layer
901
d.
Further, in
FIG. 11
,
804
designates an image formation unit,
805
designates a circuit substrate,
806
designates a cleaning brush,
807
designates a rotation magnet,
808
designates a non-magnetic cylinder,
809
designates a movement roller for moving the recording medium,
810
designates a display window, and
811
designates a body frame.
Thus, in this information board, by rotating the above-mentioned rotation magnet
807
, conductive magnetic toner
802
as a colorant substance is conveyed on the above-mentioned non-magnetic cylinder
808
, so that this is supplied on recording electrode
801
composed of a magnetic substance. Then, a voltage corresponding to the image signal generated by circuit substrate
805
is applied between conductive layer
901
c
of recording medium
803
and recording electrode
801
, and by the electric charge (10
−8
to 10
−7
c) induced in toner
802
, the above toner
802
is allowed to electrostatically adhere to recording medium
803
(1,000 to 10,000 pF/cm
2
), to thereby form an image. It is noted that the image formed once is returned to the original position by rotating recording medium
803
in the form of an endless belt by one cycle, and toner
802
is scraped down from recording medium
803
by cleaning brush
806
and recovered on the above-mentioned recording electrode
801
which is set immediately below brush
806
, so that recording medium
803
is reused.
Such an information board can perform the image writing and erasing in accordance with the image information transmitted from an external image input device, such as a computer or the like. Further, by connecting the external image input device with each information board through a network, it becomes possible to display the image information transmitted from the external image input device on each information board in a distant place simultaneously, and the information board can be effectively utilized as a display device for the notice plate, advertisement plate and the like.
Next, an electronic blackboard is explained.
FIGS. 13A
to
13
C are diagrammatic views showing the construction of the conventional electronic blackboard, and
FIG. 13A
is a top view,
FIG. 13B
is a front view, and
FIG. 13C
is a side view.
As shown in those drawings, in this electronic blackboard, within leg-fitted box type frame
1001
having, at the front, opening
1001
a
in a rectangular form, recording medium (display sheet)
1002
to be a display surface is arranged in a state such that it is built over right and left rollers
1003
,
1004
. On the surface of this display sheet
1002
, using a pen containing an exclusive ink, not only can an optional image, such as a character, a figure or the like, be written in handwriting, but also the image can be erased by a blackboard eraser, and further, the writing and the erasing can be repeated endlessly. Further, this display sheet
1002
is endlessly scanned by rotating one roller
103
using the driving device, which is not shown.
In addition, at the rear of one roller
1003
in the above-mentioned box type frame
1001
, there is arranged display surface image reading scanner
1005
which covers the entire of the width of display sheet
1002
(length in the direction perpendicular to the moving direction) and is capable of reading the image on display sheet
1002
.
Further, at the lower portion of the above-mentioned box type frame
1001
, there is arranged printer
1006
which performs the printing of the image on display sheet
1002
read by the above-mentioned display surface image reading scanner
1005
on a paper
Hotta Yoshio
Tomida Yoshinori
Yoshihara Satoshi
Barlow John
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Mouttet Blaise
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