JPH081500Y2 - Pointing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an instruction device for inputting a pulse signal having a frequency corresponding to a predetermined measurement amount and for instructing the predetermined measurement amount based on the pulse signal. .

[Conventional technology]

Conventionally, a device for inputting a pulse signal created by a detection signal having a frequency corresponding to a rotation speed generated by a sensor detecting rotation of a rotating body rotating according to a measurement amount and instructing a predetermined measurement amount from the frequency Are used in vehicle indicating devices such as vehicle speedometers and tachometers.

FIG. 4 shows a conventional pointing device of this kind, in which 1 is a rotating body that rotates in association with rotation of an axle, and a sensor that detects the rotation of the rotating body and generates a detection signal that changes in a sinusoidal shape.
2 is composed of a Schmitt trigger amplifier,
A waveform shaping circuit for shaping a sine wave signal into a pulse signal, 3 is a pulse conversion circuit configured by one-shot multi, etc. for converting the waveform of the pulse signal from the waveform shaping circuit 2, and 4 is a pulse signal from the pulse conversion circuit 3. How many are input in a unit time, or by measuring the pulse cycle, for example, in the case of a speedometer, measuring the vehicle speed, and based on this measurement result, a drive signal for driving the indicator 5. The indicator 5 is driven by the drive signal from the instruction drive circuit 4, and may be configured by a mechanical or electronic device.

In the above configuration, the operation is shown in FIG.
It will be described together with the timing chart of (c). Sensor 1
Outputs a sinusoidal detection signal having a frequency corresponding to a predetermined measurement amount as shown in FIG. 5A, and the waveform shaping circuit 2 shapes the pulse signal into a pulse signal as shown in FIG. 5B. . The waveform shaping circuit 2 changes its output from the L level to the H level when the sinusoidal detection signal becomes equal to or higher than a predetermined detection level V _ref , and outputs the H level when it becomes equal to or lower than the detection level V _ref.
A pulse signal is output by changing from the level to the L level. Then, the pulse conversion circuit 3 to which this pulse signal is input converts the duty ratio of the pulse signal to generate a pulse having a constant pulse length, as shown in FIG. 5 (c). The pulse is input to the instruction drive circuit 4, and a predetermined measurement amount such as the vehicle speed and the number of revolutions is measured by counting the pulses generated in a unit time and the drive signal is output. Then, the indicator 5 is driven by the drive signal,
Instruct a predetermined measurement amount.

Assuming that the sensor 1 is one that generates one pulse at the output of the pulse conversion circuit 3 per one rotation of the axle (predetermined detection unit), the instruction drive circuit 4 detects from the sensor 1. It is configured to give a predetermined instruction based on the signal.

[Problems to be solved by the device]

In the conventional pointing device configured as described above, when the sensor 1 is converted into, for example, four pulses generated by the pulse conversion circuit 6 per one rotation of the axle, the instruction driving circuit 4 is also changed accordingly. There must be. Therefore, it is necessary to prepare the instruction drive circuits 4 by the number corresponding to the type of the sensor 1 that may be changed, or to separately provide a frequency dividing circuit and manually set the frequency dividing ratio according to the sensor 1. Yes,
There were problems such as high cost and complication.

Therefore, in view of the above-mentioned conventional problems, the present invention, even if the pulse output based on the change of the sensor is changed, does not perform the manual setting according to the change, and the common instruction drive circuit is provided. An object of the present invention is to provide an indicating device capable of instructing a predetermined measurement amount by using an indicator.

[Means for solving the problem]

In order to solve the above-mentioned problems, an indicating device made according to the present invention comprises a sensor for generating a detection signal of a first predetermined level or higher, or a detection signal of a first predetermined level or higher and a first detection signal. A sensor for generating at least one detection signal of a second predetermined level or more which is smaller than the predetermined level;
A first waveform shaping circuit for generating a pulse signal in response to the input of a detection signal of a predetermined level or higher, and a pulse signal in response to the input of a detection signal of a second predetermined level or lower, which is smaller than the first predetermined level. A second waveform shaping circuit for generating
Counting means for counting the pulse signal from the second waveform shaping circuit and resetting the count value by the pulse signal from the first waveform shaping circuit; and holding the count value of the counting means at the time of resetting. Holding means and frequency dividing means for dividing the pulse signal from the second waveform shaping circuit using the count value held in the holding means as a dividing ratio. It is characterized in that the predetermined measurement amount is instructed based on this.

[Action]

In the above configuration, the first waveform shaping circuit generates the pulse signal in response to the input of the detection signal of the first predetermined level or higher, and the second waveform shaping circuit has the second predetermined value smaller than the first level. A pulse signal is generated according to the input of the detection signal of the level or higher.

Moreover, the counting means counts the pulse signal from the second waveform shaping circuit, the count value is reset by the pulse signal from the first waveform shaping circuit, and the count value of the counting means at the time of reset is stored in the holding means. The frequency dividing means holds the held count value as a frequency division ratio.
The frequency of the pulse signal from the waveform shaping circuit is divided, and a predetermined measurement amount is instructed based on the pulse signal from the frequency dividing means.

Therefore, as a sensor, one sensor that generates a detection signal of a first predetermined level or higher, or one detection signal of a first predetermined level or higher and a second predetermined level or lower that is smaller than the first predetermined level Even if any of the sensors that generate at least one detection signal of the sensor is used and the number of detection signals per predetermined detection unit of the sensor is changed, the frequency division is performed according to the number of detection signals per predetermined detection unit. Since the frequency division ratio of the means is automatically set and the pulse signal is frequency-divided by this set frequency division ratio, it is possible to always obtain a constant frequency division output per predetermined detection unit, and then perform no processing. The predetermined measurement amount can be instructed without performing.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the pointing device according to the present invention. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals and the detailed description thereof is omitted.

Reference numeral 11 is a sensor, and 12a and 12b are waveform shaping circuits for inputting a sine wave detection signal from the sensor 1 and shaping the waveform respectively, and outputting a pulse signal respectively.
_ref1 and V _ref2 are set in a relationship of V _ref1 > V _ref2 . 13
Is a counter in which the pulse signal from the waveform shaping circuit 12b is input to the clock input, and the pulse signal from the waveform shaping circuit 12a is input to the reset input, and 14 is the counter when the pulse signal from the waveform shaping circuit 12a is input. A latch circuit for fetching and latching the count value of the counter 14 instead of the previously latched data, and 15 has a frequency division ratio N set by the output of the latch circuit 14, and the pulse signal from the waveform shaping circuit 12b is 1 / It is a frequency dividing circuit that divides the frequency into N. The pulse signal from the frequency dividing circuit 15 is input to the instruction drive circuit 4, a predetermined measurement is performed by the instruction drive circuit 4, and the indicator 5 is driven by the measurement result.

In the above configuration, the sensor 11 has one rotation
When using a generator that generates one sinusoidal detection signal, the amplitude level of the sinusoidal detection signal is
When using one that is configured to be _ref1 or more and generates a plurality of sinusoidal detection signals, the amplitude level of one sinusoidal signal is a predetermined level as shown in FIG.
Above V _ref1 , the amplitude level of other sinusoidal detection signals is V
It is configured to be in the range of _{ref2 to} V _ref1 .

The sensor 11 that generates the plurality of sinusoidal detection signals
3 includes, for example, a rotor 11a having four teeth 11c made of a magnetic material and a detector coil that detects the teeth of the rotor 11a and generates a detection signal that changes in a sine wave shape, for example. One of the teeth of the rotating body 11a (hatched in the figure) is made longer than the other teeth or is formed to have a high magnetic property. A detection signal as shown in FIG. 2 is generated.

Now, when the sensor 11 which generates one sine wave-shaped detection signal per one rotation (predetermined detection unit) of the rotating body 11a is used, the waveform shaping circuits 12a and 12b provide one per rotation of the axle.
The individual pulse signals are output. Therefore, the pulse signal from the waveform shaping circuit 12b counts one pulse signal in the counter 13, and at the same time, is reset and latched by the latch circuit 14, and the count value latched by the latch circuit 14 is stored in the frequency dividing circuit 15. The division ratio N = 1 is set. In this state, the pulse signal from the waveform shaping circuit 12b is input to the frequency dividing circuit 15, and one pulse signal is output as it is from the waveform shaping circuit 12b to its output.

On the other hand, as the sensor 11, when the detection element 11b generates four sinusoidal detection signals as shown in FIG. 2 in response to one rotation of the rotating body 11a, the waveform shaping circuit 12a There is one sinusoidal detection signal with a level higher than the detection level V _ref1 , and the detection level V of the waveform shaping circuit 12b is
Since there are four level sine wave detection signals larger than _ref2 , the waveform shaping circuit 12a outputs one pulse signal while the waveform shaping circuit 12b outputs four pulse signals. Therefore, the counter 13 to which the pulse signal from the waveform shaping circuit 12b is input is reset every time four pulse signals are counted, the count value is latched by the latch circuit 14, and the frequency dividing ratio of the frequency dividing circuit 15 is increased. N = 4 is automatically set.

Then, the pulse signal input from the waveform shaping circuit 12b to the frequency dividing circuit 15 is frequency-divided by the frequency division ratio N set above and output. As a result, the frequency dividing circuit 15 outputs one pulse signal even for a plurality of pulses generated per one rotation of the axle.

By the above operation, the sensor 11 is changed and the axle 1
Even if the number of pulses generated per rotation is changed, the frequency dividing circuit 15 constantly supplies a constant predetermined number of pulses per one rotation of the axle to the instruction drive circuit 4, which allows the sensor 11 to be changed. It is not necessary to change the instruction drive circuit 4 accordingly. Moreover, since the frequency dividing ratio N of the frequency dividing circuit 15 is automatically set according to a predetermined number of pulses generated by the sensor 11 per one rotation of the axle, it is not necessary to manually set the frequency dividing ratio.

In the above embodiment, one rotation of the axle is used as the detection unit of the sensor 11, but two or more rotations are used as the detection unit and the number of pulses generated per detection unit may be set as the frequency division ratio N. Good.

〔effect〕

As described above, according to the present invention, even if the pulse per predetermined detection unit that is output based on the change of the sensor is changed, the common instruction drive is performed without manually setting according to the change. Since the circuit can be used,
High costs and complexity can be suppressed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a pointing device according to the present invention, FIG. 2 is a diagram showing an output waveform from a sensor for explaining the operation of FIG. 1, and FIG. 3 is an output waveform of FIG. The figure which shows the structural example of the sensor which generate | occur | produces, FIG. 4 is a figure which shows the conventional pointing device, and FIG. 5 (a)-(c) is a figure which shows each part waveform of FIG. 11 ... Sensor, 12a ... Waveform shaping circuit (first waveform shaping circuit), 12b ... Waveform shaping circuit (second waveform shaping circuit), 13 ... Counter (counting means), 14 ... Latch circuit ( Holding means), 15 ... Dividing circuit (dividing means), 4 ... Indicating drive circuit, 5 ... Indicator.

Claims (1)

[Scope of utility model registration request] 1. A sensor for generating a detection signal of a first predetermined level or higher, or a detection signal of a first predetermined level or higher and a second predetermined level or lower smaller than the first predetermined level. A sensor for generating at least one detection signal, a first waveform shaping circuit for generating a pulse signal in response to an input of a detection signal having a first predetermined level or higher, and a waveform smaller than the first predetermined level. A second pulse signal that generates a pulse signal in response to an input of a detection signal of a second predetermined level or higher
Waveform shaping circuit, counting means for counting pulse signals from the second waveform shaping circuit, and the count value being reset by the pulse signal from the first waveform shaping circuit; and the counting at the time of resetting. Holding means for holding the count value of the means, and dividing means for dividing the pulse signal from the second waveform shaping circuit using the count value held by the holding means as a dividing ratio. An instructing device, which is configured to instruct a predetermined measurement amount based on a pulse signal from the means.