JPH01171946A - Printing method - Google Patents

Abstract

PURPOSE:To prevent difference in sizes of printed materials when printing data, which have the different resolution but have the same size, are printed, by changing the frequency of the reference clock of writing data, and adjusting the sizes of the picture elements of the writing data. CONSTITUTION:The frequency of a shift clock in a shift register, which transmits printing data into a laser printer, is adjusted. The size of one dot of a picture element itself is changed, and the printing data undergo variable power. For example, when a received document of 200 dpi through a GIII FAX is printed with the laser printer of 300 dpi, the frequency of a video clock is divided by 2/3. The clock, whose frequency is multiplied by 3/2, is used. The size per picture element is expanded by 3/2 times of the original size. This is equal to the case when a received document of 300 dpi is printed. Since the vertical direction cannot be adjusted in this way, the same data as the data in the line immediately before are inserted as the next line once in two lines in order to multiply the data by, e.g., 3/2 times. Thus the two lines are increased to three lines. This method and the like are used.

Description

Detailed Description of the Invention Technical Field The present invention relates to a printing method, and in particular to a raster scan type printing device such as a laser printer, in which print data of the same size with different resolutions are printed to make the size of the printed matter the same. 6 Related to Printing Methods Conventionally, even if the print data is apparently the same size, if the resolutions are different, the respective print results will be
The appearance will be different in size.

For example, if A4 document data with a resolution of 300 dpi is
If you print with a 00 dpi laser printer, you can get a print result in A4 size, but even if it is the same A4 document data, if the resolution is 200 dpi, the print result will be 2/3 times as long in terms of length. reduced to

This is because the amount of data to be printed is different, and a specific example of this is shown in FIG.

To solve this problem, the document data received by GnlFAX must be scaled (
3/2). However, this method
This is not a good idea, considering that the amount of data is enormous and that changing the size using software takes a considerable amount of time. There is also the problem that the use of hardware dedicated to variable magnification increases costs accordingly.

Purpose The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in conventional printing methods, and to print the same size with different resolutions in a raster scan type printing device. When printing data,
An object of the present invention is to provide a printing method that can prevent printed matter from differing in size.

Structure The above-mentioned object of the present invention is achieved by a printing method in a raster scan type printing device, which is characterized in that the frequency of a reference clock signal of write data is changed to adjust the pixel size of write data. .

Hereinafter, the configuration of the present invention will be explained in more detail based on examples.

FIG. 2 is a block diagram showing the configuration of a printing system that is an embodiment of the present invention. In the figure, in the printing system shown in this embodiment, display 5. keyboard 6
Let us consider the case where print data created using a computer or data imported from an external device via communication is to be printed.

The problem here is that, as mentioned above, if the pixel density of the print data created for laser printer printing and the pixel density of the print data imported via communication are different, the appearance of the two after printing will be different. The difference is that the sizes are different.

In fact, the resolution of laser printers is generally 240 to 400.
On the other hand, the resolution of GI [IFAX correspondence is 200 dpi, and the above problem occurs.

In view of the above-mentioned circumstances, in the present invention, the size of one pixel dot is changed by adjusting the shift clock frequency of the shift register that transmits the print data to the laser printer, and the print data is scaled. It is something.

1A and 1B are arranged between a laser printer 3 and a print control section 2 that controls the laser printer 3 and performs printing in the printing system of the embodiment shown in FIG. FIG. 3 is a diagram showing details of a print data pattern output section. FIG. 1(a) shows an example in which the video register serving as a reference for the print data pattern is sent from the laser printer 3 side, and FIG. 1(b) shows an example in which the video clock is supplied to the laser printer 3 from outside. This shows an example of a case in which

In this embodiment, by adjusting the shift clock frequency of the shift register that transmits the print data to the laser printer 3, the size of one pixel itself is changed, and the print data is scaled. 6 Actually, for example, 200dpi (7) G m F
When printing an AX received document with a 300 dpi laser printer, as shown in FIG. 3, the video clock is divided by 273 and 1 frequency multiplied by 372 is used as the shift clock. As a result, the size per pixel of the print data pattern output in synchronization with the shift clock will be expanded to 372 times the original size, and the apparent size of the printed matter will be 300 d.
This is the same as printing a received document from the pi.

In addition, in the above explanation, the length in the horizontal direction was explained, but the length in the vertical direction cannot be adjusted using this method. Methods such as inserting the same data as the line as the next line and increasing 2 lines to 3 lines are used.

According to the above embodiment, even if fixed format documents with different resolutions are printed using the same printer, the scaling hardware LS can be used without software processing (without taking time).
The apparent size of the printed document can be made uniform without using I or the like.

It goes without saying that the above-described embodiments are merely examples of the present invention, and that the present invention is not limited thereto.

Note that the idea of the present invention can also be applied to serial printers.

Effects As described above, according to the present invention, in a raster scan type printing device, the frequency of the reference clock signal of the write data is changed to adjust the pixel size of the write data, so that the resolution can be improved. This has the remarkable effect of being able to realize a printing method that can prevent printed matter from differing in size when printing data of the same size with different sizes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing details of a print data pattern output unit showing an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a printing system of the embodiment, and FIG. 3 is a 200 dpi GI [
[A diagram showing a specific operation when a received FAX document is printed by a 300 dpi laser printer, FIG. 4 is an explanatory diagram of the operation showing a conventional technique. 1 System control section, 2: Print control section, 3: Laser printer, 4: Input/display control section, 5: Display, 6:
Keyboard, 7: Communication control unit. Figure 1 (&)

Claims (1)

[Claims] (1) In a raster scan type printing device, a printing method characterized by adjusting the pixel size of write data by changing the frequency of a reference clock signal of write data.