Electronic document distributing system, information display system, electronic conference system and terminal devices used for these systems
First Claim
1. An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network, wherein:
- said sending terminal device comprises;
sending means for sending an electronic document;
deletion prohibiting signal outputting means for outputting a signal to prohibit deletion of the electronic document; and
cancel signal outputting means for outputting a signal to cancel the prohibition of deletion of the electronic document; and
each of said receiving terminal devices comprises;
a memory for storing the electronic document sent from the sending terminal device;
deletion prohibiting means for prohibiting deletion of the stored electronic document in response to the deletion prohibiting signal; and
deletion permitting means for permitting deletion of the electronic document in response to the cancel signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network. Electronic documents are sent from the sending terminal device to the receiving terminal devices via the network. Simultaneously, a signal to prohibit deletion of the electronic documents is sent, and if necessary, a signal to cancel the prohibition of deletion is sent. In each of the receiving terminal devices, when a power switch is turned off, when the receiving terminal device is disconnected from the network or when a specified time passes from the sending time of the electronic documents, the prohibition of deletion is cancelled. Such an electronic document distributing system can be structured into an electronic conference system which has a terminal display device which receives and stores information sent from a host device (an electronic document server) and displays the information on a display panel. On the display panel of the terminal display device, usually, an image designated by the host device is displayed, but an arbitrary desired image can be also displayed by a key operation. The terminal display device monitors the image designated by the host device, and even while the terminal display device is displaying another image, the display device can be controlled to display the designated image by a key operation.
17 Citations
31 Claims
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1. An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network, wherein:
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said sending terminal device comprises;
sending means for sending an electronic document;
deletion prohibiting signal outputting means for outputting a signal to prohibit deletion of the electronic document; and
cancel signal outputting means for outputting a signal to cancel the prohibition of deletion of the electronic document; and
each of said receiving terminal devices comprises;
a memory for storing the electronic document sent from the sending terminal device;
deletion prohibiting means for prohibiting deletion of the stored electronic document in response to the deletion prohibiting signal; and
deletion permitting means for permitting deletion of the electronic document in response to the cancel signal. - View Dependent Claims (2, 3, 4)
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5. An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network, wherein:
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said sending terminal device comprises;
sending means for sending an electronic document; and
deletion prohibiting signal outputting means for outputting a signal to prohibit deletion of the electronic document; and
each of said receiving terminal devices comprises;
a memory for storing the electronic document sent from the sending terminal device;
deletion prohibiting means for prohibiting deletion of the stored electronic document in response to the deletion prohibiting signal;
a power switch; and
deletion permitting means for permitting deletion of the electronic document in response to an operation of the power switch.
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6. An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network, wherein:
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said sending terminal device comprises;
sending means for sending an electronic document; and
sending time signal outputting means for outputting a signal which indicates the time of sending the electronic document; and
each of said receiving terminal devices comprises;
a memory for storing the electronic document sent from the sending terminal device; and
deletion prohibiting means for prohibiting deletion of the stored electronic document based on the sending time signal. - View Dependent Claims (7)
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8. An electronic document distributing system in which a sending terminal device is connected to a plurality of receiving terminal devices via a network, wherein:
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said sending terminal device comprises;
sending means for sending an electronic document; and
deletion prohibiting signal outputting means for outputting a signal to prohibit deletion of the electronic document; and
each of said receiving terminal devices comprises;
a memory for storing the electronic document sent from the sending terminal device;
deletion prohibiting means for prohibiting deletion of the stored electronic document in response to the deletion prohibiting signal;
a detecting section for detecting whether or not the receiving terminal device is connected to the network; and
deletion permitting means for permitting deletion of the electronic document when the detecting section detects that the receiving terminal device is disconnected from the network.
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9. A terminal device comprising:
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a receiving section for receiving an electronic document;
a first memory section for storing the electronic document received;
a second memory section for receiving and storing a deletion prohibiting signal to prohibit deletion of the electronic document;
deletion prohibiting means for prohibiting deletion of the electronic document stored in the first memory section in response to the deletion prohibiting signal;
a power switch; and
deletion permitting means for permitting deletion of the electronic document stored in the first memory section in response to an operation of the power switch. - View Dependent Claims (10)
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11. A terminal device comprising:
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a receiving section for receiving an electronic document;
a first memory section for storing the electronic document received from an external apparatus;
a second memory section for receiving and storing a deletion prohibiting signal to prohibit deletion of the electronic document;
deletion prohibiting means for prohibiting deletion of the electronic document stored in the first memory section in response to the deletion prohibiting signal;
a detecting section for detecting whether or not the terminal device is connected to a network; and
deletion permitting means for permitting deletion of the electronic document stored in the first memory section when the detecting section detects that the terminal device is disconnected from the network. - View Dependent Claims (12)
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13. A terminal device comprising:
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a receiving section for receiving an electronic document;
a first memory section for storing the electronic document received from an external apparatus;
a second memory section for receiving and storing a sending time signal which indicates the time of sending the electronic document; and
deletion prohibiting means for prohibiting deletion of the electronic document stored in the first memory section based on the sending time signal. - View Dependent Claims (14, 15)
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16. An information display device comprising:
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a communicating section for communicating with a host device;
a display panel for displaying an image thereon; and
detecting means for detecting information about an image designated by the host device. - View Dependent Claims (17, 18, 19, 26, 27, 28)
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20. An information display device comprising:
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a communicating section for communicating with a host device;
a display panel for displaying an image thereon;
a display control section for controlling the display device to display desired information on the display panel; and
display returning means for controlling the display device to display an image designated by the host device on the display panel. - View Dependent Claims (21, 29, 30, 31)
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22. An information display system comprising:
a plurality of information display devices including;
a first information display device; and
a second information display device which comprises detecting means for detecting information about an image displayed on the first information display device.
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23. An information display system comprising:
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a host device which has a display panel; and
a terminal device which has a display panel and which is capable of communicating with the host device;
wherein the terminal device comprises detecting means for detecting information about an image displayed on the display panel of the host device.
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24. An information display system comprising:
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a plurality of information display devices including a first information display device and a second information display device which are capable of displaying desired information independently of each other;
wherein the second information display device comprises display returning means for controlling the second information display device to display an image displayed on the first display device.
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25. An information display system comprising:
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a host device which has a display panel; and
a terminal device which has a display panel and which is capable of communicating with the host device;
wherein the terminal device comprises a display returning means for controlling the terminal device to display an image displayed on the display panel of the host device.
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Specification