JPS5848843B2 - converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a converter for inputting mechanical signals in a digital circuit, and is particularly intended to provide a converter suitable for inputting a rotation angle.

Conventionally, a converter as shown in FIG. 1 has been used as a converter for converting mechanical (physical) quantities (position, length) into electrical quantities for processing.

In Fig. 1, 1 is a converter, and by rotating the shaft 2 of the converter 1, two output terminals 3 and 4 with a phase shift (generally electrically 900°) are output. A signal is extracted.

By counting the number of pulses of this signal, the angle at which the shaft 2 has rotated can be determined (the shaft 2 normally rotates endlessly).

Furthermore, whether the rotation is forward or reverse is determined by comparing the signals at the output ends 3 and 4.

As an example, FIG. 2 shows a method for counting the number of pulses.

In Figure 2, 5 is an up and down counter, and the two signals with different phases as shown in Figure 1 are connected to the clock terminal CP.
Assume that it is connected to the up and down terminals U/D.

This up/down counter 5 counts at the rising edge of the clock terminal CP, and the state of the up/down terminals U/D (
For example, "L" indicates UP1, "H" indicates DOWN), the count is up or down.

Now, if axis 2 in Fig. 1 rotates in the normal direction and the signal comes in at the time lapse of arrow 6, the count will go up at times 8 and 9 (because the up and down terminals U/D at that time are "L") be done.

Next, when the reverse signal comes in at the time indicated by arrow 7, the countdown begins at times 10 and 11.

In this way, the number is counted depending on whether the converter is forward or reverse.

Next, although various structures have been proposed for converters having such an output, a general and simple example is shown in FIG.

In FIG. 3, the slider 15 slides on the common electrode 12 and the toothed electrodes 13, 14 placed concentrically out of phase.

As a result, the voltage applied to the terminal (lead line) 18 is outputted as a pulse to the terminals (lead line) 16 and 17.

Although only a portion of the toothed electrodes 13, 14 are shown in FIG. 3, it is needless to explain that they are provided over the entire circumference.

As can be seen from FIG. 3, the disadvantage of this conventional structure lies in the terminal draw-out structure.

That is, since it is structurally unavoidable that the electrode and the lead wire intersect, the terminal lead-out structure must be complicated.

As shown in FIG. 4, if the pinch of the toothed electrodes 13 and 14 is P, two lead lines 16 and 18 with a width of P/2 are formed.
If the dimensions are such that they can be passed through, they will be constructed without intersecting.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a transducer in which the toothed electrode and the lead line do not intersect and the pinch that can be drawn out can be reduced.

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6.

First, 19 is a tooth-like electrode arranged at a certain pitch and has a circumference of about half the circumference, and 20 is a tooth-like electrode of about half a circumference with the same pinch as this tooth-like electrode 20, and these are arranged so as not to overlap but share the center. and if the pitch is P, they face each other with a shift of P/4.

21 is a common electrode arranged concentrically on the inner periphery of the toothed electrodes 19 and 20, and 22 to 24 are lead lines of the respective electrodes 19 to 21.

Reference numerals 25 and 26 designate a pair of sliders having an offset of 180 degrees, and these sliders 25 and 26 contact the common electrode 21 and slide on the toothed electrodes 19 and 20.

Here, if the number of teeth of the toothed electrodes 19 and 20 is an even number, a gap of P/4 will be created at the top and a gap of 43P will be created at the bottom, so a lead wire will be connected to the cap of -li-P. 24 can be passed through.

By doing this, as shown in FIG.
2 and 3 The two lead lines become one in 7P, and if the cap per lead line is the same, the number of bits in 1 can be reduced to 1 compared to Fig. 4.

This makes it possible to increase the number of output pulses per rotation.

In addition, conventionally, there is a difference in the diameter of the two tooth-shaped electrodes, and the inner electrode has a smaller radius, so higher dimensional accuracy is required than the outer electrode, but according to the configuration of the present invention, the two electrodes have the same diameter. Therefore, the dimensional accuracy is at the same level, which is advantageous.

Note that the two toothed electrodes may be arranged offset by pitch 4, which is close to ± pitch, and even if there is only one slider, it contacts the common electrode and moves over the two toothed electrodes. Any sliding configuration may be used.

The converter of the present invention is constructed as described above, and its industrial efficiency is excellent.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of the converter, Figure 2 is an explanatory diagram showing an application example of pulse counting using the same converter, Figure 3 is a schematic configuration diagram of a conventional converter, and Figure 4 is the main part of the same. FIG. 5 is a schematic diagram showing an embodiment of the converter according to the present invention, and FIG. 6 is an enlarged view of the main parts thereof. 19,20...Toothed electrode, 21...Common electrode, 24...Leader line, 25,26...
...Slider.

Claims (1)

[Scope of Claims] 1. A first tooth-shaped electrode arranged with a certain pinch and extending approximately halfway around the circumference and a second tooth-shaped electrode having approximately half the circumference and having the same pitch as the first tooth-shaped electrode overlap.1. They are arranged facing each other with a common center and shifted by 7 pitches or a pitch close to it, and the first
, a transducer characterized in that sliders arranged 180 degrees apart from each other on the second toothed electrodes slide in contact with the common electrode. 2. The transducer according to claim 1, wherein the common electrode is disposed closer to the inner periphery than the first and second toothed electrodes. 3. The converter according to claim 2, wherein the lead wire of the common electrode is drawn out from the space between the first toothed electrode and the second toothed electrode.