Facsimile and static presentation processing – Static presentation processing – Communication
Reissue Patent
1998-10-14
2001-07-03
Popovici, Dov (Department: 2722)
Facsimile and static presentation processing
Static presentation processing
Communication
C358S001130
Reissue Patent
active
RE037258
ABSTRACT:
COPYRIGHT NOTIFICATION
Portions of this patent application contain materials that are subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office.
FIELD OF THE INVENTION
The invention generally relates to improvements in computer systems and, more particularly, to operating system software for printing documents.
BACKGROUND OF THE INVENTION
One of the most important aspects of a modern computer system is the ability to generate a “hard” copy of textual information or graphics which can be manipulated by the computer, visually displayed and stored. In order to accomplish this task, a computer system generally includes a printing device which is electrically connected to the computer system and controlled by it in order to generate a permanent image on a selected medium. Examples of printing devices in common use are dot matrix, ink jet and laser printers which fix permanent images on paper under control of the computer. Although paper is the most common medium, other media are often used, such as photographic film.
In order to print a document which is displayed on the monitor or stored, within the memory, several actions must take place. First, since the print medium generally has a fixed size, the printable information must be divided into pieces which are small enough to fit on the selected medium, a process which is called pagination. In addition, the information may need to be reformatted from the format in which it is either displayed or stored into a format which is suitable for controlling the printing device to actually perform the printing on the medium. The reformatting in this latter step may include the insertion of control commands into the printable information in order to control the printing device. These added commands may, for example, include such commands as carriage returns, line feeds, form feeds, spaces and font information, all of which format the printable information. The reformatting may also include a conversion step in which a graphical display is converted into the form used by the printing device.
The pagination and reformatting necessary to convert the printable information into a form which can be printed on a given printing device is generally performed by software programs running within the computer system. Software programs operating on a computing system generally can be categorized into two broad classes: operating systems which are usually specific to a type of computer system and consist of a collection of utility programs that enable the computer system to perform basic operations, such as storing and retrieving information on a peripheral disk memory, displaying information on an associated video display, performing rudimentary file operations including the creation, naming and renaming of files and, in some cases, performing diagnostic operations in order to discover or recover from malfunctions.
By itself, the operating system generally provides only very basic functions and must be accompanied by an “application” program. The application program interacts with the operating system to provide much higher level functionality and a direct interface with the user. During the interaction between the application program and the operating system, the application program typically makes use of operating system functions by sending a series of task commands to the operating system which then performs the requested tasks. For example, the application program may request that the operating system store particular information on the computer disk memory or display information on the video display.
FIG. 1
is a schematic illustration of a typical computer system utilizing both an application program and an operating system. The computer system is schematically represented by dotted box
100
, the application program is represented by box
102
and the operating system by box
106
. The interaction between the application program
102
and the operating system
106
is illustrated schematically by arrow
104
. This dual program system is used on many types of computers systems ranging from mainframes to personal computers.
The method for handling printing, however, varies from computer to computer, and, in this regard,
FIG. 1
represents a prior art personal computer system. In order to provide printing functions, the application program
102
interacts (as shown schematically by arrow
108
) with printer driver software
110
. Printer driver software
110
is generally associated with an application program and reformats and converts the printable information as necessary. Since each printer has its own particular format and control command set, which must be embedded in the text properly to control the printer, the printer driver software
110
must be specifically designed to operate with one printer or one type of printer.
The printer driver software
110
produces a reformatted information stream containing the embedded commands as shown schematically as arrow
114
. The converted information stream is, in turn, applied to a printer port
112
which contains circuitry that converts the incoming information stream into electrical signals. The signals are, in turn, sent over a cable
116
to the printer
118
. Printer
118
usually contains an “imaging engine” which is a hardware device or a ROM-programmed computer which takes the incoming information stream and converts it into the electrical signals necessary to drive the actual printing elements. The result is a “hard copy” output on the selected medium.
While the configuration shown in
FIG. 1
generally works in a satisfactory manner, it has several drawbacks. Since the printer driver software
110
is specific to each type of printer, a separate driver had to be provided for each printer type with which the application program is to operate. In the personal computer market, there are a large number of different printer types that are compatible with each type of computer and, therefore, as the number of printer types proliferated, so did the number of printer drivers which were required for each application program so that the program was compatible with most available printers. Therefore, application program developers had to provide larger and larger numbers of printer drivers with each application program, resulting in wasted time and effort and wasted disk space to hold the drivers, only one or two of which were of interest to any particular user. Unfortunately, if a user purchased an application program and it did not include a printer driver which could control the printer which the user owned, unpredictable operation occurred, resulting in program returns and user dissatisfaction.
In addition, it was also necessary for each application program to provide high level printing functions such as pagination and page composition (including addition of margins, footnotes, figure numbers, etc.) if such functions were desired. Consequently, each application program developer had to spend time developing programs to implement common printing functions which programs were specific to each application program, thereby resulting in duplicated effort and wasted time.
In order to overcome the aforementioned difficulties, the prior art arrangement was modified as shown in FIG.
2
. In this new arrangement, computer system
200
is still controlled by application program
202
which cooperates, as shown schematically by arrow
204
, with operating system
206
. However, in the system shown in
FIG. 2
operating system
206
includes printer drivers
214
. A separate printer driver must still be provided for each different type of printer, but the printer drivers are sold with, and part of, the operating system. Consequently, it is not necessary for each application program to have its own set of printer drivers. An application program, such as application program
202
, communicates with the printer driver
214
by means of a standardized interface
de Silva Mahinda K.
Holt L. Bayles
Patel Jayendra Natubhai
Peek Mark
Watanabe Ryoji
Morgan & Finnegan , LLP
Object Technology Licensing Corp.
Popovici Dov
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