Incremental printing of symbolic information – Ink jet – Combined
Reexamination Certificate
2000-02-01
2001-09-04
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Combined
C382S100000
Reexamination Certificate
active
06283567
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a drawing method for an electronic blackboard having a copy function for copying an image from a screen sheet onto recording paper, as well as a drawing function for drawing on the screen sheet an image read from an original document.
2. Description of the Relevant Art
Conventionally, there has been known an electronic blackboard which has a drawing function for drawing (printing) on a screen sheet an image read from an original document, in addition to a copy function for copying and printing on recording paper an image read from the screen sheet.
In such an electronic blackboard, since an endless screen sheet extends between and is wound around a pair of separated transport rollers (drive and follower rollers), during use, only the front half of the screen sheet appears as an available face, and the remaining portion is concealed within a cabinet as a stored face. Therefore, when the drawing function is used in a state in which an image remains unerased on the stored face concealed within the cabinet, an image read from the original document is written over the unerased image on the screen sheet.
An electronic blackboard which can prevent such overwriting is proposed in Japanese Patent Application Laid-Open (kokai) No. 8 (1996)-156491. In the electronic blackboard disclosed in the publication, write means is disposed inside the blackboard to be located close to the screen sheet; image erasing means is disposed in the vicinity of and on the upstream side of the write means with respect to the travel direction of the screen sheet; and written images are erased immediately before writing operation is performed by the write means, to thereby prevent overwriting.
However, the above-described conventional electronic blackboard has a serious drawback in that even in the case where an image remaining unerased on the stored face of the screen sheet must remain unerased, the unerased image is automatically erased if a person who is unaware of the situation uses the drawing function. In order to solve such a drawback, there may be provided means for detecting an image remaining unerased on the stored face of the screen sheet. However, in this case, an additional mechanism is required. Resulting in increased complexity and increased cost.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electronic blackboard which prevents an image from being written over an unerased image, and which reliably eliminates the possibility of erroneous erasure of the unerased image.
Another object of the present invention is to provide a drawing method for an electronic blackboard which can be performed by use of the existing structure to thereby eliminate necessity of an additional mechanism and which can be performed with ease and at low cost.
Still another object of the present invention is to provide a drawing method for an electronic blackboard which enables drawing even when an image remains unerased on the screen sheet, to thereby allow an image to be drawn in regions other than the region in which the unerased image is present.
In order to achieve the above objects, the present invention provides a drawing method for an electronic blackboard having a copy function for copying an image from a screen sheet onto recording paper as well as a drawing function for drawing on the screen sheet an image read from an original document, wherein a print head for drawing an image on the screen sheet is disposed on the upstream side of a read head for reading an image from the screen sheet, with respect to the forward travel direction of the screen sheet; when an image is printed on the screen sheet, the screen sheet is moved in the reverse travel direction; and when the read head reads an image on the screen sheet, print stop processing is performed in order to stop printing operation of the print head.
If an unerased image is present on the stored face of the screen sheet when printing on the screen sheet is performed, the unerased image on the stored face passes by the read head, because the screen sheet is moved in the reverse travel direction during such a printing operation. If the read head reads an unerased image, the print stop processing is performed in order to stop printing operation of a print head, and warning display processing is performed in order to display a message indicating that an unerased image is present on the screen sheet.
REFERENCES:
patent: 61068627 (1986-04-01), None
patent: 01263099 (1989-10-01), None
patent: 02127721 (1990-05-01), None
patent: 08065430 (1996-03-01), None
patent: 08065432 (1996-03-01), None
patent: 8156491 (1996-06-01), None
Hirano Masaki
Hori Yasushi
Barlow John
Birch & Stewart Kolasch & Birch, LLP
Huffman Julian D.
Nagano Japan Radio Co. Ltd.
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