JPH0453542Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-speed waveform recording device using a thermal head array.

[Conventional technology]

Pen-written oscillographs have traditionally been a common method for high-speed waveform recording.

This pen-written oscillograph uses a pen galvanometer to perform high-speed recording, and has a remarkable effect on the user's visual sense.

That is, when the pen enters the high-speed region as shown in FIG. 3a, the recording becomes high-speed and high-density, and so-called envelope recording 9 is executed. This is highly appreciated in that it makes the user's visual recognition clearer.

However, such a pen-written oscillograph has the disadvantage that the structure is complicated because the pen must be operated at high speed, and the inertia of the recording pen 10, which is a movable part, is large. 100HZ～
It only had a high-speed response capability of about 120Hz.

To improve this point, a high-speed waveform recording device using a thermal head array has been proposed.

Since this high-speed waveform recording device uses a thermal head for recording, it has the advantage of having no moving parts, a simple structure, and improved high-speed response capability.

However, when this device enters a high-speed region, data loss occurs as shown in FIG. 3b, and it does not perform so-called envelope recording, resulting in a drawback that the user's visual recognition ability is weak.

This means that when recording the signal under test using a thermal head array, the recording timings T ₁ , T ₂ ,
This is caused by recording using only sampling data at time points T ₃ , ..., T _o , ....

[Problem that the invention attempts to solve]

As described above, the conventional high-speed waveform recording apparatus using a thermal head array has the drawback that data loss occurs in the high-speed region, and so-called envelope recording cannot be performed.

The present invention aims to eliminate this drawback and provides a high-speed waveform recording device using a thermal head array that can properly reproduce envelope recording.

[Means for solving problems]

Therefore, in the present invention, the recording timings of the signal under test T ₀ , T ₁ , T ₂ ,...
..., T _o , ... (period T), and a timing generation circuit that determines the signal under test with a sampling period t (mt=T, m
is an integer), a CPU that controls the operation and processing of the device, and under the CPU processing, the above recording timings T ₀ T ₁ , T ₁ T ₂ , T ₂ T ₃
A memory for storing sampling data obtained by the above-mentioned sampling means between..., T _{o-1 and} T _o , and a maximum and minimum memory for extracting the maximum and minimum values of the sampling data stored in the memory. The thermal head array is provided with an extracting means and a heat generating means for simultaneously heating all the heat generating elements between the two heat generating elements of the thermal head array corresponding to the maximum value and minimum value determined by the maximum and minimum extracting means.

[Effect]

Recording with a thermal head depends on the recording timing.
This is done at T ₀ , T ₁ , T ₂ , ..., T _o , ....

When the signal under test is in the high-speed region, the above recording timings T ₀ T ₁ , T ₁ T ₂ , T ₂ T ₃ , ..., T _o-1 T _o , ...
...The envelope recording can be reproduced by extracting the maximum and minimum values from the sampling data between them and filling in the space between these maximum and minimum values.

〔Example〕

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention, and FIG. 2 is a timing diagram of the apparatus shown in FIG.
In the figure, 1 is a sampling means that samples the signal under test at a period t, 2 is an A/D converter that converts the analog value of the signal under test into a digital value at the sampling period of the sampling means 1, and 3
is the CPU that controls device operation and data processing,
31 is a ROM in which a program that determines the control operation of the CPU 3 is written; 32 is a first memory that stores digital values output by the A/D converter 2; and 33 is a memory that stores digital values output by the A/D converter 2. 4 is a thermal head driver for driving a thermal head array, 5 is a recording paper drive circuit, 6 is a thermal head array, 7 is a recording paper feeding mechanism, and 8 is a recording paper.

First, the device of the present invention will be explained with reference to FIG.

Although the device shown in FIG. 1 is not shown, it has a reference signal oscillator, which determines the timings T ₀ , T ₁ , T ₂ , ..., T _o , ... of the period T related to the recording operation of the device. and a timing generation circuit (sampling means) that determines a period t (mt=T, m is an integer) related to sampling, digitization, memory writing, etc. of the signal under test. In this specification, the former timings T ₀ , T ₁ , T ₂ , ..., T _o , ... are referred to as recording timings, and the latter timings t ₁ , t ₂ , ..., t _n are referred to as sampling timings.

When a signal to be measured in a high-speed region is input, it is sampled by the sampling means 1 at a sampling timing of period t and sent to the A/D converter 2.
is converted into a digital value via When this sampled data is between recording timings T ₀ T ₁ , this data is written to the first memory 32. By writing m sampling data into the first memory 32, T ₀ T ₁
Data storage in between ends. The sampling data during the next period T ₁ T ₂ is stored in the second memory 33 . During the period in which data between T ₁ and T ₂ is being written to the second memory 33, the following processing is performed. That is, the data stored in the first memory 32
The maximum value and minimum value are extracted from the data between T _{0 and} T ₁ by CPU processing, and only the maximum value and minimum value are stored in the first memory 32 again. Then the CPU
3 reads out the maximum and minimum values, creates a signal that heats up everything between the heating elements of the thermal head array 6 corresponding to the maximum and minimum values, and outputs the signal to the thermal head array 6 via the thermal head driver 4. operate and perform recording for the period T ₁ T ₂ . When this recording is completed, the CPU 3 outputs a paper feed signal to the recording paper drive circuit 5 to move the recording paper 8 by one step.

Next, when this process is completed, the data stored in the second memory between T _{1 and} T ₂ is processed in the same manner as above, and the recording during the period T ₁ and T ₂ is recorded by the thermal head array 6. Ru. During this processing period, the first memory 32 stores sampling data during the period T ₂ T ₃ . Envelope recording is performed by performing these processes and recording one after another.

FIG. 2 is a timing diagram showing this series of operations.

Sampling is performed at sampling timings t _{1 ,} t ₂ , ..., t _n between recording timings T 0 T ₁ , and in synchronization with this, this m
sampling data is stored. next period
During T ₁ T ₂ , m pieces of sampling data for this period are stored in the second memory 33. period
When the sampling data at T ₁ T ₂ is stored in the second memory 33, the sampling data stored in the first memory 32 is processed and recorded by the thermal head array 6.

Next, the sampling data for the period T ₂ T ₃ is stored in this empty first memory 32, and the sampling data for the period T ₁ T ₂ stored in the second memory 33 is processed and recorded. .

This operation is performed sequentially.

Furthermore, at the end of each period, 1
The paper is fed by the number of steps.

[Effect of idea]

As explained above, according to the present invention, in high-speed waveform recording using a thermal head array,
There is an advantage that the high-speed region can be envelope-recorded almost accurately.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
Figure 1 is a timing diagram showing the operation of the device, Figure 3 is a timing diagram showing the operation of the device.
The figure is a diagram showing an example of recording in a conventional device. 3... CPU, 31... First memory, 32...
...Second memory, 6...Thermal head array.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a recording device that performs high-speed waveform recording using a thermal head array, recording timings of the signal under measurement T ₀ , T ₁ , T ₂ ,
..., Tn, ... (period T), and a timing generation circuit that determines the sampling period t (mt=T,
m is an integer), a CPU that controls the operation and processing of the device, and under the CPU processing, the above recording timings T ₀ T ₁ , T ₁ T ₂ , T ₂
A memory for storing sampling data by the above sampling means between _T3 , ..., T _o-1 T _o , ..., and extracting the maximum and minimum values of the sampling data stored in the memory. The present invention is characterized by being provided with a maximum/minimum extraction means and a heat generating means for simultaneously heating all the heating elements between the two heating elements of the thermal head array corresponding to the maximum and minimum values obtained by the maximum/minimum extraction means. High-speed waveform recording device using a thermal head array. (2) The above memory is stored at the above recording timings T ₀ T ₁ , T ₂ T ₃ ,...
..., between T _o-2 T _o-1 , ..., a first memory for storing sampling data by the sampling means at ..., between the recording timings T ₁ T ₂ , T ₃ T ₄ , ...
..., T _o-1 T _o , and a second memory for storing sampling data by the sampling means at ..., and under the control of the CPU, the first and second memory operations, the maximum A high-speed waveform recording device using a thermal head array according to claim 1, characterized in that continuous recording is performed by sequentially performing minimum extraction operations.