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Grayscale printing method of thermal printer

A thermal printer and grayscale technology, applied in the temperature recording method, etc., can solve problems such as inaccurate empirical formulas, unsatisfactory grayscale printing effects, etc., and achieve the effect of fine details

Pending Publication Date: 2022-04-05
上海商米科技集团股份有限公司
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Problems solved by technology

However, since the heating time of the heating point is not in an ideal linear relationship with the generated temperature, the empirical formula used to calculate the heating time is not accurate when a point is heated multiple times; moreover, the chemical heat layer of thermal paper appears The color density and temperature are not strictly linear. For a heating point, the heating is completed once and divided into multiple times (for example, eight times) to complete the heating. The color depth displayed on the thermal paper is not the same. Therefore, this The grayscale printing effect completed by this method is not ideal

Method used

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  • Grayscale printing method of thermal printer
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  • Grayscale printing method of thermal printer

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Embodiment 1

[0039] In the prior art, the number of heating times required for a grayscale value of 0 to 255 and the proportional coefficient of each heating time are shown in Table 1 below:

[0040] Table 1

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

[0047]

[0048] In the present invention, the number of heating times required for the grayscale value 0 to 31 and the proportional coefficient of each heating time are shown in Table 2 below:

[0049] Table 2

[0050]

[0051]In the process of printing grayscale patterns on thermal printers, it is assumed that a certain grayscale bit Figure 1 There are 8 pixels in the dot row, and their gray values ​​are shown in Table 3.

[0052] table 3

[0053] pixel number 0 1 2 3 4 5 6 7 grayscale value 45 166 95 107 159 0 73 255

[0054] Follow the steps below to print this line in 5-level grayscale:

[0055] Divide the gray value m of each pixel in a row by 2 3 , and then de...

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Abstract

The invention relates to a gray printing method of a thermal printer, which comprises the following steps of: dividing the gray value m of each pixel of a point row by 23, then decomposing according to a binary mode, and heating a certain point for at most 3 times. The grayscale image obtained by adopting the grayscale printing method disclosed by the invention is finer in details and closer to the effect of an original image.

Description

technical field [0001] The invention relates to the field of thermal printers, in particular to a grayscale printing method for thermal printers. Background technique [0002] Currently, thermal printers are widely used to print tickets and labels. On the thermal print head, there is a row of equidistantly arranged heating points that can be independently controlled. When printing, these heating points are in close contact with the thermal printing paper. When heating a specific point, the color of the corresponding point on the thermal printing paper will become darker (black, blue or red, etc., but one thermal paper will only display one color), and at the same time, the steps of the printing head The feeding motor pushes the printing paper forward a little line, and the printing of a little line is completed. Compared with dot matrix printers, inkjet printers, and laser printers, thermal printers have the advantages of being compact and requiring no ribbons or ink cartr...

Claims

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Application Information

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IPC IPC(8): B41M5/26
CPCY02P10/25
Inventor 周哲衡林喆陈桂鸿
Owner 上海商米科技集团股份有限公司
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