Facsimile and static presentation processing – Static presentation processing – Emulation or plural modes
Reexamination Certificate
1995-01-23
2001-10-23
Rogers, Scott (Department: 2624)
Facsimile and static presentation processing
Static presentation processing
Emulation or plural modes
C358S001150, C358S442000, C358S468000
Reexamination Certificate
active
06307639
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application makes reference to, incorporates the same herein, and claims all benefits incurring under 35 USC §119 from an application for Data Transmission/Reception Device Using An Electrophographic Development Process And A Method Thereof filed in the Korea Industrial Property Office on Jan. 21, 1994 and assigned Ser. No. 1994/1123.
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a data communication and image process system, and more particularly to a device for controlling data transmission/reception between electrophotographic printers from local and remote areas and a method thereof.
2. Background Art
Laser printers or LED (light emitted diode) printers for printing images or documents in response to the reception of signals from a personal computer (hereinafter, referred to as a computer) are well known. In a typical printer of this type as illustrated in U.S. Pat. No. 5,197,117 for Text Information Processing Apparatus Having Printer And Printing Dot Signal Generating Apparatus For The Same issued to Kato et al., a memory is provided for storing image signals from the computer. The computer formats the image signals in the manner required for the printer, and the printer memory is adapted to store bit mapped image pages of images prior to initiating printing. The printer then sequentially reads out from the bit mapped memory to modulate the light beam of a laser diode. The light beam of the laser diode is controlled to scan a photoconductive drum where the image is subsequently stored, developed and transferred to a recording paper in a manner conventional to electrophotographic devices.
This type of printers is different from the general printer in that it employs electrophotographic process to form images with low noise and high resolution. Such printers, however, can only function when they are directly connected to a host computer (i.e., local computer). Consequently, in order for this type of printer to communicate with a remote facility, such as a remote computer or a remote facsimile (FAX) machine via a public subscriber telephone network (PSTN), a separate facsimile machine is required as shown, for example, in U.S. Pat. No. 4,930,017 for Communication Terminal Device issued to Izawa. In Izawa '017, the separate facsimile machine is connected to the laser printer for enabling the laser printer to print facsimile information from a remote facsimile machine, or to scan the information printed on a recording paper and transmit it to a remote facsimile machine via telephone lines of the public subscriber telephone network. However, the information in a computer cannot be directly transmitted to a remote facsimile machine, unless the computer is connected to the cable of the public subscriber telephone network via an interface. The information must be first printed out on a recording paper and then scanned by a host facsimile machine and transmitted to the remote facsimile machine. Likewise, any information from a remote facsimile machine can not be directly displayed by the computer unless the computer is connected on line with the public subscriber telephone network, and must be first received and printed out by the host facsimile machine and then input into the computer. The printing and scanning procedures, however, inevitably delay the time of data transmission, and considerably increase the distortion of the transmitted information.
In Izawa '017, the separate facsimile machine used is of the general type; one that prints facsimile information on a thermosensitive recording paper having a predetermined size. Although this type of facsimile machine is most commonly used, the thermosensitive recording paper is subject to gradual image deterioration over a long period of time. In addition, the thermosensitive recording paper has smooth surface which does not receive and accommodate handwritten characters well. Moreover, the general facsimile machine is limited to operation only with the thermosensitive recording paper having a predetermined size. Consequently, the general facsimile machine is less desirable.
There are two other types of facsimile machines, however. The first type is a PP-facsimile (plain paper facsimile) machine; one that prints facsimile information on a plain, ordinary recording paper rather than printing on a thermosensitive recording paper. The second type is a PC-facsimile (personal computer facsimile) machine; one that is incorporated into a computer to provide the computer with the function of a facsimile machine by way of a facsimile transmission/reception board. In the PP-facsimile machine, the electrophotographic process is employed to form facsimile messages on a plain, ordinary recording paper. Consequently, the facsimile information formed on the recording paper has high resolution and low noise. Although the PP-facsimile machine produces facsimile messages of high resolution, it, however, requires a separate scanner for scanning and reading facsimile information formed on the recording paper if transmission to a remote facsimile machine via the public subscriber telephone network is requested. Unfortunately, if a separate scanner is installed in conjunction with the PP-facsimile machine, the cost of the PP-facsimile machine would exceed the cost of a laser printer. Moreover, the PP-facsimile machine does not have the capability to receive and print image signals from a host computer when compared with the laser printer. Further, when the scanner is used to scan and read facsimile information formed on the recording paper so as to transmit the read facsimile information to a remote facsimile machine via the public subscriber telephone network, data distortion often occurs while driven by the of the scanner. This results in the degradation of the printed facsimile messages at the receiving end of the remote facsimile machine.
The PC-facsimile machine, on the other hand, uses a computer to transmit a screen edited by the computer to the remote facility, such as a remote facsimile machine or a remote computer in the form of an image file. When serving as a facsimile machine, the computer must, however, be used in conjunction with a scanner as an input device and a printer as an output device. Any facsimile information received from the remote facility such as a remote facsimile machine is converted into a language readable by the computer and is stored in its auxiliary memory in the form of the image file for subsequent display on its monitor, or print out by the printer. The PC-facsimile has an enormous advantage in that the document transmitted via the public subscriber telephone network is quite clean except for a few errors occur during the transmission, when compared with both the general facsimile and PP-facsimile machines where most of the errors are generated when the scanner scans the document. As mentioned earlier, in order to implement the PC-facsimile, a facsimile transmission/reception board is built-in the PC as shown in U.S. Pat. No. 5,196,943 for Facsimile Information Distribution Apparatus issued to Hersee.
A typical PC-facsimile machine is shown in U.S. Pat. No. 5,228,128 for Personal Computer Facsimile Device issued to Kim, and assigned to the same assignee of this application. In Kim '128, the PC-facsimile machine is designed to, inter alia, transmit a document or an image directly to and receive the same directly from a remote facsimile machine via the public subscriber telephone network. The remote facsimile machine in Kim '128 can be another PC-facsimile machine or a general facsimile or PP-Facsimile machine. In order for the PC-facsimile to communicate with the remote general facsimile, these machines must first convert the image file being transmitted from a standard computer file format, such as ASCII, into a graphical image format compatible with the remote facsimile machine and transmit such graphical image to the remote facsimile machine. Since graphical images arc much larger than standard files, the conversion
Eom Yoon-seop
Lee Chang-Sub
Lee Dong-Ho
Bushnell , Esq. Robert E.
Rogers Scott
Samsung Electronics Co,. Ltd.
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