JPS60216669A - Picture recording device - Google Patents

Abstract

PURPOSE:To obtain picture recording having a desired and visually easy to see picture density by recording a picture signal plural number of times on a scanning line in recording the picture based on a binary picture signal. CONSTITUTION:A picture recording device consists of monostable multivibrators 40, 42, serial-in/serial-out shift resisters 44, 46, AND gates 48, 50, OR gates 52, 54 and a shift register 20. In energyzing a stylus based on the binary picture signal, the device acts like obtaining a prescribed black level density through three times power application. Two stages of intermediate tone such as dark intermediate tone and light intermediate tone are obtained at the boundary region between a black level and a white level by shifting right or left the binary picture signal at each energyzing recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an image recording device for recording binary image numbers.

2. Prior Art FIG. 1 shows a schematic configuration diagram of a conventional energization recording apparatus, and FIG. 2 is a time chart illustrating the operation of the configuration shown in the first diagram.

In the configuration shown in the first diagram, numeral 8 is an energized recording paper, and on its side, a large number of styli 10 are arranged in a line corresponding to one scanning line segment of the image; , and an electrode 14 connected to an energizing power source 12 is in contact with the other surface. The stylus 10 is grounded through transistors 16 and 1B, and the transistor 16 is controlled to turn on and off based on a binary signal, and the p1 transistor 18 is turned on to select a group of the stylus 10.
-011'l? 'It is something that is controlled. Since a very large number of styluses 10 are used, the control circuit would be large-scale to control all of them at the same time.In this example, groups are created for each appropriate number, and each group is In order.

The next step is control.

For each group of transistors 16, there are two
A digitized image signal is given, but it is binarized on the recording paper 8 only by the stylus 10 of the group corresponding to the transistor 18 which is turned on in a sequential manner by the output of the group selection circuit 22. Recording will be performed based on the image signal.

A binarized image signal corresponding to one group of the styli 10 is serially input to the shift register 20 in synchronization with a clock pulse based on a synchronization signal. For this purpose, the AND logic of the clock pulse and the synchronization signal is taken in the AND gate 22 and the register 20 is
The input signal is input to the clock terminal of the register 20, and data is taken into the register 20 based on the AND logic of the synchronizing signal and the binary signal by the AND gate 24.

Further, for the group selection transistors 18 of the stylus 10, group selection circuits QA, QB, Q
, O, a base signal is applied from the time when the data is sequentially fetched into the shift register 20 until the next data is fetched.

The time chart in FIG. 3 explains this operation.

As is clear from the time chart of the moxibustion diagram, the synchronization signal becomes 11# when the binary image signals corresponding to each group of the stylus 10 are taken into the shift register 20, and the synchronization signal of the shift register 20 becomes 1''. During this period, the input of a clock pulse is received, and a binary image signal is captured in synchronization with the clock pulse.

After the data has been taken into the shift register 20 from the group selection circuit 22, the stylus 1 to which recording is to be performed depends on the data taken into the shift register 20.
For the bases of the transistors 18 corresponding to the group 0, the base signals Q, A, Q, B, QC! give. Thus, the stylus 10 of the selected group is selected through the transistor which is made conductive in response to the binary image signal from the shift register 20, and current is applied to the selected stylus 10 from the electrode 14 via the current-carrying recording paper 8. flows, the selected stylus 1 of the energized recording paper 8
The position corresponding to 0 is colored and recording is performed. This operation is performed in the same way for each group of the stylus 10, and when the recording corresponding to all groups is completed, the recording for -scanning line is completed. An object of the present invention is to provide an image recording apparatus that can obtain a desired recording density in an image recording apparatus in which a large number of recording elements are arranged in the scanning direction.

FIG. 6 shows a circuit diagram of an image recording apparatus L)' according to an embodiment of the present invention. Shift register 200 of the third illustrated circuit
The outputs 20A to 2ON are directly connected to the output side circuit of the shift register 20 of the first illustrated circuit.

Before explaining the configuration of the 81S3 illustrated circuit, the recording method thereof will be explained.

Figure m4 is an explanatory diagram of the RIHI image recording method based on the configuration shown in Figure 6, and when the stylus 10 is energized based on the binary image signal, the desired black level density can be obtained by energizing the stylus 10 three times. By shifting the binary image signal to the right or left for each energization recording, two levels of dark and light intermediate tones can be created in the boundary area between the black level and the white level. This makes it possible to obtain intermediate tones.

Therefore, by making the binary image signal during the second energization correspond to the original binary image signal, the black level adjacent to the white level is recorded in a dark halftone, and the white level adjacent to the black level is recorded in a light halftone. It will be done.

The image recording apparatus according to the configuration shown in the third figure realizes the above image recording method. In the figure, reference numeral 40 denotes a first monomultiplier that outputs a high level for a certain period of time in synchronization with the fall of the synchronization signal. , 42 is a second monomulti which outputs a high level for a certain period of time in synchronization with the rising edge 5 of the output of the first monomulti 40, Ad, 46 is a serial-in/serial-out shift register, and 48 is a synchronization signal. and a clock pulse, and provides the output to the clock terminal of the shift register 44 and the clock terminal of the shift register 20 and 46 through the OR gate 52. An AND gate which receives the input of No. li and supplies a binary image signal to each input terminal 1N of the shift registers 44 and 46 for a period of 1 degree when the synchronization signal is "1"; 54 is each output OU of the shift registers A4 and 46;
Each shows an OR gate that applies T to a 200 Å power terminal of a shift register.

The operation of the circuit shown in the third diagram will be explained according to the time chart shown in the fifth diagram.

While the synchronization signal is "1", AND gate 48°50 becomes 51fIl, and the binary image signal is shifted to N+2 bits in shift register 'j-0, in synchronization with the clock pulse.
It is read into A4, 46. At this time, the same signal for the last two bits read is recorded in the shift register aa, 46K. When loading is finished,
Of the read data, shift register zoK! Data is recorded based on the stored data 20A to 201J, and this is done by selectively setting the gate signals QA, QB, and QC of the group selection transistors 1B of the stylus 10 to high level. It will be done.

Note that the output of the monomulti 40 rises in synchronization with the falling edge of the synchronization signal, and then falls at time T1 after a certain period of time has elapsed. At this time, the clock terminal inputs of the shift registers 46 and 20 fall, and both The contents of the disk are shifted by one bit. From this point on, 2 of the shifted shift register 20
Signal recording based on the value image signal is started. Note that the output of the monomulti 42 rises in synchronization with the fall of the output of the first monomulti 40 and falls at time T2 after a certain period of time has elapsed; at this time, the clock terminal inputs of the shift registers 46 and 20 are On the falling edge, the contents of both registers are further shifted by one bit. From this point on, signal recording based on the shifted binary image signal of the shift register 20 is started.

Through the above operations, N of shift registers 46 and 20 is
While the +2-bit binary image signal is shifted one bit at a time, signal recording based on the contents of the shift register 20 between each shift is performed once each, for a total of three times.

According to this configuration, as shown in the explanatory diagram shown in FIG. 4, it is possible to obtain two levels of intermediate tones in the boundary area between the black level and the white level.

Note that the data in the shift register 44 is stored in the shift register 20 when recording is performed with the next group of styli 10.
This is applied to the output binary signals 20A and 20B of the uppermost bit of the group, and is provided so that the same effect can be obtained even at the boundary between each group. Therefore, in the next data read, N bits will be read.

This operation is performed for each group of stylus 10, and one line's worth of recording is finally performed.

In the above embodiment, recording is performed by shifting the data in the register 20 twice between each of the three recording time stages.
Although we have designed an i-format system that can obtain two levels of intermediate tones, the recording time can be set to any number of levels, and the intermediate tones in the boundary area between the black level and the white level can be set arbitrarily. It is something.

Also, as a matter of course, if one scan of the stylus 10 is not divided into groups, the shift register 20 is provided for one scan of binary signals, and therefore,
The boundary between the white level and the black level between each group requires consideration, and therefore the shift register 44 is not required.

Second, in the sub-illustrated configuration, it is impossible to adjust the density of the intermediate tone, but it is possible to change the intermediate FAa degree in the boundary area between the black level and the white level. Naturally, possible configurations should also be considered.

Examples of such a configuration are shown in FIGS. 6 and 7.

The circuit shown in the sixth figure lowers the base voltage of the transistor 1621 to pass through the transistor 16 for selecting the squirrel IOA to 1014 only during the first and third recording of the three stages of recording.
In order to reduce the L current, the output of the second monomulti 42 is connected to the resistor 64A through the driver 60.
A driver 3 for driving each transistor 16A to 16N via 64M and diodes 66A2 to 66N1.
By connecting to the outputs of 2A to 52H, when the output of the monomulti 60 is 10'', each transistor 16A to 52H
A configuration is adopted in which the base potential of 161J is lowered to reduce the current flowing.

According to this configuration, of the six stages of recording, the second stage is recorded only during the second stage of recording based on the N binary image signal.
Since the output of the second monomulti 42 is "1", recording is performed at normal density. However, during the first and third stage recording when the output of the second monomulti 42 is "0", the transistors 16A to 16A are The current of 16N is reduced appropriately, and recording is performed with a light density. Here, when all black level recordings are given in 1st, 2nd, and 3rd level recording, it is important to set each factor so that a normal black level can be obtained. The rate of change between white levels can be set freely.

This is explained in Figure 8. In the configuration shown in Figure 3, the midtone density in the ascending range of the black level and white level changes at a constant rate as shown in (a). However, if you set the current at each stage (so that the current at the 1st and 3rd stages is always lower than the 2nd stage) so that the desired density is finally given to the black level, the same result can be obtained. Figure (1)), (
As shown in 0), the rate of change in bacterial level increases.

That is, according to the configuration shown in FIG. 6, it is possible to freely set the rate of change in halftone density between the black level and the white level.

The seventh example is a circuit that can achieve the same purpose as the configuration shown in the sixth figure.
The illustrated configuration may be mentioned.

The configuration shown in FIG. 7 is designed to increase the 6N emitter 11iJ voltage to the transistor 6A for selecting the stylus 10A to 1ON to reduce the current flowing only during the first and third recording of the six stages of recording. After inverting the output of the second monomulti 42 with an inverter 62, it is further injected through an amplifier 68, diodes 70A to 70M, and then diodes 72A2, 72B1, 72B2, etc.
By connecting to the emitter of each transistor 1 (SA to 16N) via 72N1, when the output of the monomulti 60 is "0#", the emitter potential of each transistor 16A to 16N is increased to increase the current flowing. A configuration is adopted that reduces the number of times.

According to this configuration, among the five stages of recording, the second stage is recorded only during the second stage of recording based on the original binary image signal.
Since the output of the second monomulti 42 is "11", recording is performed at normal density. However, during the first and third stages of recording when the output of the second monomulti 42 is 101, the current of the transistor 16A-11 is will be reduced appropriately and recording will be performed with a light density.Here, when all black level recordings are given in 1st, 2nd, and 3rd level recording, each factor is adjusted so that a normal black level can be obtained. By setting this, the rate of change in the black level and white level of the halftone density is exactly the same, but this becomes possible by adjusting the output of the adjustment/amplifier 68 for this purpose.

<Effects> As described above, according to the present invention, when recording an image based on a binary image signal, a desired image density can be obtained by recording the image signal multiple times on the same scanning line. . Therefore, it is possible to obtain a new image recording device that can obtain visually easy-to-read image recording.

[Brief explanation of the drawing]

FIG. 1 is a circuit 1q configuration diagram showing an example of a general image recording device, FIG. WJ2 is a time chart explaining the operation of the configuration shown in the first diagram, and FIG. 3 is a circuit diagram of an image recording device according to an embodiment of the present invention. 4 is an explanatory diagram of the operation of the configuration shown in the sixth figure; FIG. 5 is a time chart explaining the operation of the configuration shown in the sixth figure; FIG. 6 is a circuit of an image recording apparatus according to another embodiment of the present invention. FIG. 7 is a circuit diagram of an image recording apparatus according to still another embodiment of the present invention, and FIG. 8 is an explanatory diagram of the operation of the circuits shown in FIGS. 6 and 7. 8... Current-carrying recording paper 10... Stylus 14... Electrode 16... Stylus selection transistor 18... Group selection transistor 20... Shift register 22... Group selection circuit 26... Logic circuit 40.42...Monomulti 4446...2-bit shift register Applicant: Canon Company, Figure 3, Figure 4

Claims (1)

[Claims] a recording means constituted by a large number of recording elements arranged in the main scanning direction for recording a binary image signal; - a storage means for storing the binary image signal for a scanning line; and a storage means for storing the binary image signal on the same scanning line. An image recording apparatus comprising an output control means for outputting a binary image signal stored in the means to the recording means a plurality of times.