JPH06233057A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To suppress black painting-out of small characters and blur of fine lines by measuring the density of a black block printed on a thermosensitive recording paper and correcting the strobe application time by this density to print characters in accordance with the sensitivity of the heat-sensitive recording paper to be used. CONSTITUTION:A microcomputer 4 controls a thermal head 5 and a strobe control circuit 6 to print a black block having a certain density on the thermosensitive recording paper, and it is read by a read sensor 1. The read output is converted to a digital signal by an A/D converter 2 and has the waveform corrected through shading correction 3, and the strobe application time is calculated in accordance with the obtained value and a preliminarily prepared conversion table and is stored. The strobe control circuit 6 is controlled by this stored value at the time of printing characters, thereby printing characters with a proper recording density.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine using thermal paper as a recording paper, and more particularly to a facsimile machine capable of printing according to the sensitivity of the thermal recording paper.

[0002]

2. Description of the Related Art Generally, in a facsimile machine, one using a thermal paper as a recording paper is widely used. In this type of facsimile machine, the thermal recording paper is designated as a designated paper and a thermal recording paper other than the designated paper is used. If you do, we do not guarantee. Therefore, when using a thermosensitive recording paper that has a higher sensitivity than the designated paper, small characters, etc. will be blackened, and when using a thermosensitive recording paper that has a lower sensitivity than the designated paper, insufficient density, thin lines, etc. will occur. It may happen.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus which prints according to the sensitivity of a thermal recording paper to be used and suppresses black crushing of small characters and thin lines.

[0004]

The above-mentioned object is to measure a density of a black block printed on a thermosensitive recording paper and start a series of operations for correcting a strobe application time, and a switch for printing a black printed image. This is achieved by providing a circuit for measuring the density of the block and a table for converting an appropriate strobe application time from the density.

[0005]

[Function] When a thermal sensor is used to read a thermal recording paper on which a black block of a certain density is printed using a thermal head and the density of the printed black block is measured and the value is lower than the expected value By increasing the strobe application time of the thermal head and conversely shortening the strobe application time of the thermal head when it is dark, it is possible to print in accordance with the sensitivity of the thermal recording paper, and small black lines and fine lines It is possible to suppress the fading of the skin.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As a first embodiment, FIG. 1 is a block diagram for explaining a facsimile apparatus according to the present invention. When the switch for starting a series of operations is turned on when the thermal recording paper is replaced, the microcomputer 4 controls the thermal head 5 and the strobe control circuit 6 in FIG. Print the black block of n lines. Next, the printed thermal recording paper is inserted along the document guide, the black block printed on the thermal recording paper is read by the m line (m ≦ n) reading sensor 1, and its output is A / D converted. Convert it to a digital signal by the device 2, correct the waveform through the shading correction 3, send it to the microcomputer 4, calculate the average density of the black block, and calculate the strobe application time from that value and the conversion table prepared in advance. Remember that value. Then, from the next printing, the strobe control circuit 6 is controlled by the stored value to print with an appropriate recording density.

Next, as a second embodiment, FIG. 2 is a block diagram for explaining a facsimile apparatus according to the present invention. When a switch for starting a series of operations is turned on when the thermal recording paper is replaced, the microcomputer 4 controls the thermal head 5 and the strobe control circuit 6 in FIG.
A black block of a certain density is printed on the thermal recording paper for n lines. Next, the photo sensor 7 provided on the recording paper discharge side of the thermal head 5 reads m lines (m ≦ n) of the black block printed on the thermal recording paper, and the output is digitalized by the A / D converter 2. The signal is converted into a signal and sent to the microcomputer 4 to calculate the average density of the black block, the strobe application time is calculated from the value and a conversion table prepared in advance, and the value is stored. Then, from the next printing, the strobe control circuit 6 is controlled by the stored value to print with an appropriate recording density.

[0009]

According to the present invention, even when thermal recording papers having different sensitivities are used, it is possible to suppress black crushing of small characters and blurring of fine lines by adjusting the sensitivity, so that information can be recorded on the thermal recording paper. Can be reproduced accurately.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

1 ... Read sensor, 2 ... A / D converter, 3 ... Shading correction, 4 ... Microcomputer, 5 ... Thermal head, 6 ...
Strobe control circuit, 7 ... Photo sensor.

Claims (2)

[Claims] 1. A facsimile device using thermal paper as recording paper, wherein a thermal head is used to read a thermal recording paper on which n lines of a black block of a certain density are printed by a reading sensor to print the black block. A facsimile machine characterized by measuring the density of m lines (m ≦ n) and correcting the strobe application time of the thermal head using the value and a conversion table. 2. A photo sensor in which a thermal recording paper, on which a black block of a certain density is printed for n lines, is provided on the recording paper discharge port side of the head in a facsimile apparatus using thermal paper as recording paper. Let me read
A facsimile machine characterized in that the density of a printed black block is measured for m lines (m ≦ n), and the strobe application time of the thermal head is corrected using the value and a conversion table.