Eraser for electronic blackboard
First Claim
1. An eraser for an electronic blackboard system whih erases information being written on an input board and displayed or stored electronically on a display unit, said eraser comprising:
- main means held by hand and for sending erasing signals to erase said information;
first means, attached to said main means, for corresponding to a relatively small area of said information;
second means, detachably engaged with said main means, for corresponding to a relatively larger area of said information compared to said first means;
position detecting means, in said main means, for detecting and sending signals corresponding to positional coordinates of said position detecting means, said position detecting means comprising a magnetic sensor;
first sensor means, in said main means, for detecting whether said eraser is contacting the surface of the input board and generating an in-use signal when said eraser is in use; and
second sensor means, in one of said main means and said second means, for detecting whether said second means is attached to said main means and sending a second means in-use signal, designating an area for erasure to correspond to said larger area, when said second means is in use.
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Accused Products
Abstract
An eraser for an electronic blackboard. System whose erasing area is variable according to the size and accuracy of the figure to be erased. The eraser includes a main unit carrying a small area erasing unit, and a large area erasing unit which is detachably engaged to the main unit. Detectors installed in the main unit detect when the eraser is touched on the surface of the board, and/or that the large area erasing unit is being used, and send an appropriate signal to the system controller.
When the system controller receive the signal, it blanks the memories corresponding to the area covered by the erasing units and erases the corresponding area of figures displayed on the display unit.
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Citations
17 Claims
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1. An eraser for an electronic blackboard system whih erases information being written on an input board and displayed or stored electronically on a display unit, said eraser comprising:
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main means held by hand and for sending erasing signals to erase said information; first means, attached to said main means, for corresponding to a relatively small area of said information; second means, detachably engaged with said main means, for corresponding to a relatively larger area of said information compared to said first means; position detecting means, in said main means, for detecting and sending signals corresponding to positional coordinates of said position detecting means, said position detecting means comprising a magnetic sensor; first sensor means, in said main means, for detecting whether said eraser is contacting the surface of the input board and generating an in-use signal when said eraser is in use; and second sensor means, in one of said main means and said second means, for detecting whether said second means is attached to said main means and sending a second means in-use signal, designating an area for erasure to correspond to said larger area, when said second means is in use. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17)
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16. An eraser according to cliam 4, wherein said magnetic sensor comprises a Hall effect device.
Specification
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- Resources
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Current AssigneeFujitsu Limited
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Original AssigneeFujitsu Limited
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InventorsOhta, Hajime, Kodani, Hideyuki, Enokido, Shunji
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Primary Examiner(s)Curtis, Marshall M.
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Application NumberUS06/568,807Time in Patent Office1,243 DaysField of Search340/706, 340/707, 340/708, 340/709, 340/710, 178/18-20, 235/472US Class Current178/19.01CPC Class CodesG06F 3/03545 Pens or stylusG06F 3/038 Control and interface arran...
