JPS5822903B2 - visual recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a visible recording device that records and forms a visible image on a recording paper in response to an input signal, and in particular, the present invention relates to a visible recording device that records and forms a visible image on a recording paper in accordance with an input signal, and in particular, the present invention relates to a visible recording device that records and forms a visible image on a recording paper in accordance with an input signal, and in particular, the invention relates to a visible recording device that records and forms a visible image on a recording paper in accordance with an input signal. This invention relates to a visual recording device that prevents distortion, etc.

Apparatus for visually recording, for example, television signals on recording paper, generally consists of a rotating drum around which the recording paper is wound, and a recording transducer for emitting, for example, an ink beam towards the recording paper. If the rotation of the rotating drum and the timing of the ink beam emission from the recording transducer are not maintained in an accurate relationship, the visible pattern recorded on the recording paper will be distorted.

Conventionally, countermeasures such as applying a servo to the drive morph of the rotating drum around which the recording paper is wound have been taken, but the inertia of the drive mechanism of the rotating drum is generally large.
There is a limit to the improvement in response speed, and the configuration also tends to become complicated.

In particular, in a visual recording device for television signals, it is necessary to synchronize the position of the recording paper and the input recording signal at all times, so it is extremely difficult to control jitter using the servo control described above.

On the other hand, in order to remove such jitter, it has been considered to control the timing at which the input recording signal is input to the recording converter, but the current proposal is to simply delay the input recording signal. - This is an extremely primitive method in which a delay device is provided and the delay time of this delay device is controlled in accordance with the error in the rotational speed, and is difficult to realize.

In other words, in order to delay a television signal, etc. by a controlled amount of time, a large number of capacitors are used as a delay device.
It is necessary to use an analog memory consisting of input/output registers (switch groups), etc., which tends to make the entire device expensive and complicated, making it impractical.

In view of the above circumstances, an object of the present invention is to provide a visual recording device that can perform visual recording in which the uneven rotation of the rotating drum is eliminated with a simple circuit configuration without using an expensive delay device or the like. .

That is, the feature of the visible recording device according to the present invention is that in the device for visually recording on a recording paper according to an input signal to be drawn or drawn, a first control unit controls the output timing of a pixel information signal obtained by sampling the input signal. a rotating drum around which the recording paper is wound and rotates; a frequency generator that detects the rotation of the rotating drum; a second oscillator that generates a signal; and a flip-flop circuit that is set according to the pixel information signal controlled by the first oscillator and reset by the signal from the second oscillator, the flip-flop circuit By controlling the recording timing on the recording paper on the rotary drum according to the output of the rotary drum, a visible image is recorded in which the uneven rotation of the rotary drum is compensated for.

Next, as an embodiment of the present invention, an inkjet type visible recording device that uses a television signal, but still images, so-called still image reproduction signals as input signals, will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a recording converter placed opposite to a rotating drum 3 around which a recording paper 2 as a recording medium is wound.

This recording converter 1 is of a so-called inkjet type, and is generally composed of a nozzle 4, a charging electrode 5, deflection electrodes 6a and 6b, and a collection plate 7.

The nozzle 4 is provided with an electrostrictive element 8, which is excited by an oscillator 9 to cause the nozzle 4 to vibrate in the longitudinal direction.

Due to this vibration, the colored ink that is force-fed into the nozzle 4 is emitted from the tip of the nozzle 4 as a fine beam 10 toward the deflection electrodes 6a and 6b.

When no voltage is applied to the charging electrode 5, the beam 10 of fine particles of colored ink travels straight between the deflection electrodes 6a and 6b, collides with the collection plate 7, flows down, and is collected. When a negative voltage is applied, it is positively charged when it passes through the charging electrode 5, so when it passes through the deflection electrodes 6a and 6b to which an upward electric field is applied in the figure, it is charged upward as shown in the figure. The recording paper 2 is deflected so that it reaches and adheres to the recording paper 2 without colliding with the collection plate 7.

The rotating drum 3 is rotationally driven by a drive device 11.

A vertical synchronization signal of a television signal (video signal) as an input recording signal input to an input terminal 13 separated by a vertical synchronization separation circuit 12 is added to this drive device 11, and the drive device 11 A rotary drum 3 is rotated once per field of a television signal in synchronization with a synchronizing signal.

Further, the recording transducer 1 moves slightly in the axial direction of the rotary drum 3 when the rotary drum 3 makes one revolution.

This movement pitch is related to the resolution. For example, when one horizontal scanning line is composed of 300 pixels such as 300 dots or small line segments, 2. The recording transducer 1 is connected to the rotating drum 3 by 1/300 of the length of the horizontal scanning line above.
move in the axial direction.

Note that as the means for moving the recording converter 1, an appropriate means such as that used in a facsimile machine or the like is used.

- On the other hand, the input terminal 13 is supplied with a still image reproduction television signal from, for example, a video sheet recorder, and this television signal is supplied to the A/D converter 1.
4 is input.

This A/D converter 14 includes a horizontal synchronizing signal separation circuit 15
an oscillation circuit 16 that receives a horizontal synchronization signal of a television signal separated by the oscillation circuit 16 and outputs a signal synchronized with the horizontal synchronization signal;
It consists of a D conversion circuit 17.

This human/D conversion circuit 17 includes a function generation circuit, a sampling circuit, etc., and samples the television signal at a time point delayed from the horizontal synchronization signal by a time corresponding to the position of the recording converter 1, A number of pulses with a constant pulse width corresponding to the amplitude of the sampled television signal are sent out as pixel information signals in synchronization with the output of the oscillation circuit 16.

Note that the A/D conversion circuit 17 outputs a number of pulses corresponding to the amplitude of the sampled television signal, and the number of output pulses is determined by the required stage of recording gradation on the recording paper 2. In this embodiment, zero pulses are output for the brightest image, and up to four pulses are output as the image becomes darker.

That is, the television signal is recorded on the recording paper 2 in five gradations.

The details will be described later. Further, the output of the A/D converter 14 is input to a delay device 18.

This delay device 18 gradually increases or decreases the delay time according to the rotational speed of the rotary drum 3, in other words, the delay or advance of the relative speed between the recording converter 1 and the recording paper 2 from the reference value. It is something.

This delay device 18 is, for example, an AND gate 19.
, 20, an inverter 21, an R-S flip-flop 22, a monostable multi-bi break 23 for waveform shaping, which has the same oscillation frequency as the oscillation circuit 16, and whose oscillation phase is connected to the rotation axis of the rotary drum 3. Frequency generator 24
The oscillation circuit 25 is controlled by the output of the oscillation circuit 25.

The output of the A/D converter 14 and the output of the oscillation circuit 16 are input to one AND gate 19, and the output of the A/D converter 14 and the output of the oscillation circuit 16 are input to the other AND gate 20.
The output of the /D converter 14 and the output of the oscillation circuit 25 are input.

The outputs of these gates 1-19 and 20 are applied to the set input terminal and reset input terminal of the R-S flip-flop 22, respectively.

The Q output of this R-S flip-flop 22 is input to a monostable multi-bi break 23, and the output of this monostable multi-bi break 23 is supplied to the charging electrode 5 of the recording converter 1.

The quasi-stable period of this monostable multi-bibreak 23, that is, the pulse width of the output pulse, is determined to be the same as the output pulse width of the A/D converter 14.

Note that the output pulse of this monostable multi-bi break 23 has negative polarity.

Next, the operation of the embodiment will be explained with reference to FIGS. 2 and 3.

Now, FIG. 2 shows a state in which the recording paper 2 is unfolded with the axial direction of the rotary drum 3 in the left-right direction, and the even field horizontal scanning lines of the recorded image of the television signal are denoted by 11a, 11a,
12a...Also, set the odd field horizontal scanning line to 1.
1b, 12b...

It is also assumed that as the rotary drum 3 rotates, the recording converter 1 sequentially scans the recording paper 2 along straight lines 11c, 62c, . . . in even fields.

If the rotating drum 3 is rotating at a regular speed and without speed unevenness, in other words, the relative speed between the recording converter 1 and the recording paper 2 is at the reference value and during the entire rotation period. In the case where the recording transducer 1 is uniform, the point P11a on the recording paper 2.

P21a..., Pl 2a, P22a...
... (even field), point pHb, P21b...
..., P12b.

P22b... (odd field) is the center position, and the number or amount of colored ink corresponding to the amplitude value at each sampling time of the television signal applied to the input terminal 13 is projected and deposited. .

FIG. 3A shows the states of the signals of each part of the A/D converter 14 and the delay device 18 in this state, that is, the state in which the recording paper 2 is running at a normal relative speed with respect to the recording converter 1. , B is shown as a solid line.

In addition, in A and B of the same figure, Sl is the output signal of the oscillation circuit 16, and S2 is the A/D converter 14 or A/D converter circuit 1.
7 output signal, S3 is the output signal of inverter 21, S4
is the output signal of the oscillation circuit 25, S5 is the output signal of the AND gate 19, S6 is the output signal of the AND gate 20, S7 is the point power signal of the R-S flip-flop 22, and S8 is the output signal of the monostable multi-bi break 23. Figure A shows when the recorded image of the television signal is the darkest, that is, the amplitude of the television signal is the smallest, and Figure B shows when the recorded image of the television signal is brighter, that is, when the amplitude of the television signal is thicker. It's a critical time.

To explain in detail the operation of each part in Fig. 3A, A/
The D conversion circuit 17 samples the television signal applied to the input terminal 13 at a time point corresponding to the scanning position on the recording paper 2 of the recording converter 1, and outputs a number of constant pulse widths corresponding to the amplitude value of the television signal. The signal S2 is converted into the output signal S1 of the oscillation circuit 16.
Output in sync with.

Since this is the darkest gradation, the A/D conversion circuit 17 outputs four pulse output signals S2.

In response to this signal S2, the AND gate 19 outputs the illustrated output signal S having the same pulse width as the signal S.

Also, the rotating drum 3 is rotated normally and the frequency generator 2
4 sends a voltage equal to the reference value to the oscillation circuit 25, the oscillation circuit 25 outputs a pulse with the same repetition frequency as the output signal S1 of the oscillation circuit 16, delayed by the reference time τ4 from the output signal S1, and with a stable pulse width. A signal S4 (solid line) is output.

As a result, the AND gate 20 outputs the pulse output signal S as shown.
Output a (solid line).

The R-S flip-flop 22 is set by the trailing edge of the signal S5 and reset by the trailing edge of the signal S6, and outputs the illustrated Q output signal S7 (solid line).

The trailing edge of this signal S7 causes a monostable multi-by-break 2
3 is triggered, and a negative polarity pulse output signal S8 delayed by the reference delay time τ8 from the output signal S2 of the A/D conversion circuit 17 and having the same pulse width is output.

This signal S8 is applied to the charging electrode 5 of the recording transducer 1, through which the fine beam 10 of colored ink passes.
be positively charged.

The positively charged beam 10 is electrostatically deflected while passing between the deflection electrodes 6a and 6b, and reaches and adheres to the recording paper 2 without hitting the collection plate 17.

In this case, the signal S8 consists of four pulses and is delayed from the signal S2 by the reference delay time τ8.
Dots of colored ink are arranged and deposited on a straight line 11c.

In the case of FIG. 3B, the signal S8 is two pulses, so similarly, for example, the point P2 on the recording paper 2 is
Two dots of colored ink are deposited in an array on a straight line 11c centered on 1a.

In this way, point P11a. P21a......
P12a, P22a..., and point pHb, P
21b..., P12b, P22b...
A pattern of colored ink dots is formed around each point, and the television signal is stippled on the recording paper 2.
will be recorded visibly on the top.

Note that the timing at which the A/D conversion circuit 17 samples the television signal, that is, each horizontal scanning line 11a, 12a,
. . . , 11 b , 12 b . . . The time from the horizontal synchronizing signal of the television signal corresponding to the sampling until sampling is performed is such that the rotary drum 3 rotates and the recording converter 1 is scanned. lines, that is, straight lines 11c, 12
c..., 11d, 12d......, and the scanning of the recording converter 1 is a straight line 1)l
c, 12c, etc., it increases linearly.

In other words, it corresponds to the movement pitch L of the recording transducer 1 in the 3-axis direction of the rotating drum, and since this point is normally carried out in this type of recording device, it will not be described in further detail. Probably.

By the way, what has been described above is the case where the rotating drum 3 maintains a regular rotational speed and there is no rotational unevenness, but even if the drive device 11 is subjected to servo control, rotational unevenness can be eliminated, that is, the rotating drum 3 It is extremely difficult to maintain a completely uniform rotational speed at each time during one rotation, and some rotational unevenness remains.

Therefore, if the delay time τ8 of the recording signal, that is, the signal S8 applied to the charging electrode 5 of the recording converter 1 from the signal S2 is constant, the colored ink formed on the recording paper 2 due to uneven rotation of the rotary drum 3 is The center of the dot array is point P
11a.

P21a..., pHb, P21b...
This results in a recorded image with many so-called sick spots.

However, in this embodiment, the frequency generator 24 detects the rotational speed or rotational phase of the rotating drum 3 and sends a voltage corresponding to the rotational speed to the oscillation circuit 25 to control the oscillation phase of the oscillation circuit 25. By controlling the delay time of the signal S8 from the signal S2, the occurrence of jitter due to uneven rotation of the rotating drum 3 is compensated for and prevented.

That is, when the rotational speed of the rotary drum 3 lags behind the reference value, the output voltage of the speed generator 24 decreases from the reference value, and as a result, the signal S1 of the output signal S4 of the oscillation circuit 25
The delay time for the signal S8 increases from τ4 to τ4', the reset point of the flip-flop 22 is delayed by that amount, and the delay of the signal S8 from the signal S2, that is, the delay time of the delay device 18 increases from the reference value τ8 to τ8'. The timing at which the charging electrode 5 positively charges the colored ink fine particle beam 10 is delayed to compensate for the delay in the rotational speed of the rotating drum 3, and the colored ink dots form points P11 aP21 a...
. . ., Pl lb, P21b, . . . will be correctly arranged.

Moreover, when the rotational speed of the rotary drum 3 advances from the reference value, it is sufficient to consider the case in the completely opposite manner to the above.

By controlling the delay time of the delay device 18 in this manner, fluctuations in the relative speed between the recording converter 1 and the recording paper 2 are compensated for, and jitter and the like are prevented from occurring.

Note that the present invention is not limited to the configuration of the above embodiment; for example, in the above embodiment, the A/D converter 14 is a so-called analog/pulse that outputs a number of constant width pulses corresponding to the amplitude of an analog signal. Although numerical conversion is performed, it may be configured to perform so-called analog/pulse width conversion in which the output pulse width is changed depending on the amplitude of the analog signal.

Further, in the above description, an analog signal such as a television signal is exemplified as an input signal, but the present invention can be applied even if the input signal is a digital signal.

Further, the means for generating relative speed between the recording transducer and the recording medium (the driving device 11 in FIG. 1) can be simplified.

As described above, according to the present invention, it is possible to realize simple and inexpensive recording and reproducing without the effects of the relative speed between the recording paper and the converter, such as problems such as sick.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of a recording/reproducing apparatus according to the present invention, and FIGS. 2 and 3 are a running diagram and a waveform diagram, respectively, for explaining the operation of the same. 1... Recording converter, 2... Recording paper,
3... Rotating drum, 13... Input terminal, 14... A/D converter, 18...
Delay device, 22...R-S flip-flop,
24... Frequency generator.

Claims (1)

[Claims] 1. A first oscillator for controlling the output timing of a pixel information signal obtained by sampling the input signal to be synchronized with the oscillation output signal in a device for visually recording on a recording paper according to an input signal to be drawn or drawn. a rotating drum around which the recording paper is wound and rotates; a frequency generator that detects the rotation of the rotating drum; and a signal having the same frequency as the first oscillator in synchronization with the rotation signal from the frequency generator. and a flip-flop circuit set by the pixel information signal whose output timing is controlled by the signal from the first oscillator and reset by the signal from the second oscillator. , by controlling the recording timing on the recording paper on the rotary drum by the timing at which the output signal corresponding to the pixel information signal from the flip-flop circuit is reset by the signal from the second oscillator; A visible recording device that records and forms a visible image in which uneven rotation of the rotating drum is compensated for.