JPH0216260Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a pen writing recorder.

Normally, pen recorders have a limited response of about 100 to 120 Hz due to structural constraints such as pen inertia.

The present invention aims to improve this point by providing a pen recorder that utilizes digital processing to enable substantially high frequency response.

Hereinafter, the present invention will be described in detail with reference to an embodiment of the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, 1 is an A/D converter, 2 is a memory, 3 is a D/A converter, 4 is a pen drive circuit, and 5
is a recording pen, 6 is a speed detection circuit, 7 is a control circuit,
8 is a recording paper feed roller, and 9 is a recording paper. A/
The D converter 1 receives the input signal at a sufficiently fast sampling rate (for example, 100K for a recorder with a 100Hz response).
Hz) is appropriately A/D converted. The memory 2 is composed of, for example, a combination of a RAM and an address counter that can change the amount of delay as desired. The D/A converter 3 converts the output from the memory 2 into a D/A converter. Pen drive circuit 4
receives the output of this D/A converter 3, constructs a suitable servo circuit, and drives the recording pen 5. The speed detection circuit 6 detects the speed of the input signal using the other input element of the input signal. This speed detection circuit 6 has a differentiating circuit and a comparator, and the differentiating circuit has an output obtained as an absolute value of speed and is connected to one input terminal of the comparator. The set value (in this example, the value corresponding to the highest response frequency of the pen recorder used) is input to the other input terminal of the comparator, and this comparator also inputs the differential circuit output and the set value. The configuration is such that an output is generated when the differential circuit output exceeds a set value or falls below a set value.

The control circuit 7 is usually constituted by a microcomputer to simplify the circuit configuration, and generates control signals to the A/D converter 1, memory 2, and D/A converter 3 in response to the above-mentioned output. That is, when the differential circuit output exceeds the set value (the input signal exceeds the maximum response frequency), the delay amount of memory 2 is increased and the recording paper feeding speed is slowed down.
Conversely, when the differential circuit output falls below the set value, the recorded value remaining in memory 2 is read with a delay corresponding to the speed corresponding to the highest response frequency of the device until it is recorded in normal recording. At the same time, increase the recording paper feed speed.

FIG. 2 shows the circuit configuration diagram shown in FIG.
FIG. 6 is an explanatory diagram showing the timing of the signal shown in FIG.
A is the output of the speed detection circuit 6. An upward output indicates when the input signal exceeds the maximum response frequency, and a downward output indicates when the input signal falls below the maximum response frequency. B indicates the write timing for writing the recorded value into the memory 2. C indicates the read timing for reading the recorded value read from the memory 2. D indicates the recording paper feed control timing from the control circuit 7.

Actual recording corresponding to the timing shown in FIG. 2 is shown in the lower part of FIG. 2 as normal recording, delayed recording, and maximum speed recording. Normally, recording is done when the input signal is below the highest response frequency. Delayed recording is started when the upward output of the speed detection circuit 6 is input to the control circuit 7, and recording is performed at an appropriate speed below the highest response frequency by slowing down the reading speed and recording paper feeding speed. In this case, even after the speed detection circuit 6 outputs a downward signal, that is, the input signal returns to within the response frequency range of the device, the recording is delayed for a while until it finishes recording the previously recorded value outside the response frequency range. can continue. During this time, the recorded values that have returned to within the response frequency range are stored in the memory 2. In maximum speed recording, the stored recorded values are recorded at a speed (maximum speed) corresponding to the highest response frequency of the device. This maximum speed recording continues until the stored recorded value is exhausted. After that, it will be a normal record. At this time, an arithmetic processing function can be provided in the control circuit 7 in order to soften the state change at each recording state change point. The arithmetic processing function gradually increases or decreases the timing speed near the state turning point.

FIG. 3 is a recording diagram showing an example of recording by a pen recorder related to the present invention. 10 is a recording trace. Records similar to normal records are obtained.

In the embodiments of the present invention, a device related to the present invention is built into a pen recorder. Good too.

As described above, the present invention has the advantage that even when an input signal outside the response frequency range of the device is input, substantial recording is possible through digital processing.

[Brief explanation of the drawing]

Figure 1 is a configuration explanatory diagram showing an example of the circuit configuration of a pen recorder related to the present invention, Figure 2 is a timing diagram explaining the timing of some lines in Figure 1, and Figure 3 is a diagram of the main It is a record example diagram of the pen recorder related to the invention. 1...A/D converter, 2...memory, 3...
D/A converter, 4... Pen drive circuit, 5... Recording pen, 6... Speed detection circuit, 7... Control circuit, 8
... Recording paper feed roller, 9... Recording paper, 10...
Record trace.

Claims (1)

[Scope of utility model registration request] an A/D converter that digitally converts the input signal;
It has a memory 2 that can store the output of the A/D converter and delay it by a desired amount, a D/A converter that converts the memory output into analog, and a control circuit that controls these; In pen recorders that perform analog recording by receiving device output,
A speed at which a change in the input signal is detected and a signal is generated to the control circuit with the start and end points of the range of the input signal exceeding the highest response frequency of the pen recorder as first and second outputs, respectively. a detection circuit is provided, and the control circuit is configured to control a first speed detection circuit of the speed detection circuit.
When the second output of the speed detection circuit is received, the delay amount of the memory is increased, the recording paper feeding speed of the pen recorder is reduced to a speed corresponding to the delay amount of the memory, and the second output of the speed detection circuit is received. Sometimes, the delay amount of the memory and the recording paper feeding speed are the same as when the first output is received until the digital value at the point immediately before the output digital value of the A/D converter at that point is recorded. After the digital value at the previous point in time is recorded, the data reading speed of the memory is adjusted so that the digital value stored in the memory is recorded at the maximum recording speed of this pen recorder. After controlling the recording paper feed speed and recording the digital values stored in the memory, the data reading speed of the memory and the recording paper are controlled so that the recording speed of the pen recorder is controlled to the normal recording speed. A pen recorder characterized by controlling the feed speed.