JPS6037672B2 - Recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-speed recording method for a matrix type recording device such as electrostatic recording used in a facsimile recording section.

FIG. 1 shows the main structure of an electrostatic recording head to which the subordinate method and the recording method of the embodiment of the present invention are applied.

Recording is done using six 1280 electrostatic electrodes (lined up in 30 lines in the figure) that correspond to the picture elements of one scanning line called a multi-stylus.
The event is divided into 20 groups of 4 each. The 64 styli of each group with the same number are commonly connected. And the back electrodes IA~20A, IB~ as follows.
A potential is applied to 20B, and the combination applies an electric field to the recording paper placed between the multi-stylus and the back electrode. (picture element)
(Back electrode) 1-32: Stylus 1-32, IA, IB33- Me: Stylus 33-
64,2L IB65~96: Stylus 1~32
, 2L is 97-128: Stylus 33-64, 3A
, Waves 1217-1248: Stylus 1-32, 20
A, 2 B1249-1280: Stylus 33-64
,(21),2 For example, to record the 6th picture element as black, it is sufficient to apply a potential to the 5th electrode on the stylus side and the back electrode of the 2A wave.

Note that since it is virtually impossible to apply a potential to the back electrode 21 alone, it may be used in common with the back electrode 20B.

In order to record with a iron or the recording circuit as described above, it is sufficient to sequentially apply a potential to picture elements 1 to 1280 in the manner described above.

However, according to such a method, it takes a time of 1280×TR (TR is the time required for one recording) to record one horizontal scanning line.

As transmission speeds increase, this becomes a major problem. A second method conventionally used to avoid this is "parallel recording."

That is, picture elements 1 to 32, 33 to 64, 65 to 96, .
...This is a method in which 40 groups from 1249 to 1280 are processed at once for each group. By doing this, the time required for recording is reduced to 1/32. An object of the present invention is to realize a recording method that further speeds up the recording method.

In order to achieve the above object, the present invention divides information to be recorded on a scanning line into a plurality of predetermined blocks (
In the above example, for example, 32 mahjong elements constitute one block).

No recording is performed on blocks that are completely white, and recording is performed only on blocks that include black pixels. In addition, as a preferred embodiment of recording drive for blocks containing black pixels, all black blocks are recorded in multiple blocks at once, and blocks in which white and black pixels coexist are recorded in parallel as before. Make it.
Note that recording all black blocks at once includes not only recording all black blocks at once, but also recording a plurality of all black blocks at the same time.

According to the present invention, the recording time is extremely shortened in areas where there are many all-white blocks, and furthermore, according to the preferred embodiment, the recording time for all-black blocks is also shortened.

Also, it seems that there is little improvement in recording mixed black and white blocks, but when run-length encoding is used as the image signal transmission method, mixed blocks inherently require transmission time, so the code transmission speed and recording It has the advantage of being able to achieve considerable time alignment. Hereinafter, the recording method according to the present invention will be explained using examples.

FIG. 2 shows a recording system according to the present invention, as shown in FIG. 1, which is a device having a recording section in which end faces are arranged on a line like 30 and a plurality of back electrodes are arranged symmetrically with respect to the line 30. The configuration of an embodiment of the recording drive circuit when applied to is shown.

Although the purpose of this embodiment is to speed up the above-mentioned recording, the following problems arise due to the special characteristics of the recording system shown in FIG. That is, for example, the next picture element block 33
~ 64 (Back IB, 2A) 65 ~ 96 (Back 2B,
2A) If 129 to 160 (back side 3B, 3A) are all black blocks, the electrodes on the stylus side are 1 to 160 (back side 3B, 3A).
It is necessary to apply it to all of 32, 33 to 64.

On the other hand, regarding picture elements 97 to 128, since the voltage is also applied to the electrodes on the stylus side 33 to 64, picture elements 97 to 128 are recorded even though they should not be recorded. Therefore, it is impossible to record all black blocks at once. In this example,
In order to solve this problem, the all-black block is divided into blocks of stylus electrodes 1 to 32 and blocks of 33 to 64 (the former will be referred to as odd blocks and the latter as even blocks).

). Then, as the first stage, 65 to 96 (back side 2B, 2
A) Record all black blocks 129 to 160 (back side 3B, 3A).

At this time, only the stylus side electrodes 1 to 32 are applied. Next, as the second step, all black blocks 33 to 64 (back IB, 2A).

record the track. At this time, the stylus side electrode is 33~
Only the 64 side has an impression of 0. If you do this, 2B
and 33~ during the time when 3A is applied respectively.
Since no voltage is applied to the stylus 64, it will not be incorrectly written as described above. The above will be specifically explained using the drawings. In the figure, an 8-bit input signal is applied to data bus 71 and an input set destination designation input signal is applied to address or control bus 72 in a manner described below.

Furthermore, there are input terminals 84-85 for specifying input signals for distinguishing between the styli 1-32 and 33-64. Now,
In this embodiment, recording is performed as follows.

First, 8-bit information corresponding to the 8-bit states of the styluses 1 to 8 is added from the data bus line 71. Then, it is added to the register 74 according to the designation from the address bus 72. If 1 to 8 are all black, they all become "1".

Then, information corresponding to numbers 9 to 16 is added and also added to the register 74. The signal already set in register 74 is added to register 75 after the shift register. Similarly, information "1" corresponding to black is set in all registers 74-77.

At this time, a method of setting or resetting the register to the negative position may be used. Then, stylus electrodes 1 to 32
Information for driving is applied to input terminal 84. Information specifying the back electrode then passes through the address bus 71 and is sent to registers 78, 79, 80, 8 as specified by the input 72.
It is set to 1, 82, 83. In the example above,
"1" is set in the registers corresponding to 2B, 2A, 38, and 3A, and recording is performed at the same time.

With the above steps, recording of all-black odd-numbered blocks is completed. Similarly, the styli 33 to 64 are specified using the input terminal 85, and recording of all black even blocks is completed. Then move on to the mixed block.

In this case, since the information on the stylus side is different for each block, it is not possible to perform the same operation on all applicable blocks at once.
Therefore, it is necessary to perform this for each block. This is based on the same idea as before, so that only one back electrode of the corresponding A side and one B side is applied, and the information to be applied to the stylus in that block is transmitted from the register 74 to the register 74 as described above.
Just set it to 77. As mentioned above, in general, in so-called high-efficiency coding such as run-length coding, a complex pattern requires a large number of bits to express it, and the opposite is true for a simple pattern. When the number of bits is small, the time required for transmission is also short, and high-speed recording is required.

The scheme of the present invention meets this need. In addition,
In the description of the present invention, a case has been described in which all black blocks are classified into odd and even blocks, but it is also possible to divide them into three or more blocks.

Furthermore, within the range permitted by the recording device, any other method may be used, such as recording a plurality of consecutive blocks at once.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a recording head in the conventional system and in the case of implementing the present invention, and FIG. 2 is a diagram showing the configuration of a recording head drive circuit in an embodiment of the present invention.
IB-20B are back electrode drivers, 78-83 are registers therefor, 1-64 are stylus electrode drivers, 7
4 to 77 are registers therefor, 71 is a bus line therefor, 72 is a bus line for addressing the same, and 84 and 85 are input terminals for designating the stylus block (1 to 32, 33 to 64). Multi/Figure 2

Claims (1)

[Claims] 1. The signal of one scanning line obtained by decoding high-efficiency encoded data is used to drive the recording section only for a plurality of predetermined blocks, and the drive of the block recording section including the black pixels is controlled in black and white. A recording method characterized in that for mixed blocks, the recording section is driven for each block, and for blocks consisting only of black, the recording section is driven all at once.