JPS6229001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact type detection device that extracts the relative position of two objects as an electrical signal.

Conventionally, non-contact detection devices using light or magnetism have been used as devices for this type of detection, but such conventional devices have the drawback of high manufacturing costs. In addition, contact type devices are now available that are relatively inexpensive to manufacture, but they can only obtain two states, on and off, and cause chattering during switching, making them unsuitable for high-speed position detection, etc. There are some serious drawbacks.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to be able to manufacture a contact type at low cost, to obtain a continuously changing electric signal, and to greatly improve usability by not causing chattering. The purpose is to provide a detection device that can perform

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
This will be explained with reference to the figures. Reference numeral 1 denotes a conductor member formed by punching a metal plate into a comb-like shape, in which a large number of electrodes 2 having a width W are provided parallel to each other on one side edge of a bridge portion 3 at intervals of pitch l. A strip-shaped resistance layer 4 having a thickness h and a width V is disposed substantially parallel to the bridge portion 3 in common contact with the upper surface of each electrode 2 . Reference numeral 5 denotes a contact having a substantially U-shaped contact portion 5a in contact with the upper surface of the resistance layer 4 at its tip, which slides linearly on the resistance layer 4 along the longitudinal direction of the resistance layer 4. It is considered possible. 6 is a DC power supply,
The positive terminal of this is connected to the contact 5 via a lead wire 7, and a detection circuit 9, for example, an ammeter is connected between this negative terminal and the other end of a lead wire 8 whose one end is connected to the bridge section 3. has been done.

Next, to explain the operation of this embodiment configured as described above, the pitch l is set sufficiently large relative to the width W of the electrode 2, and the thickness h of the resistance layer 4 is set to 1/10.
The current waveform obtained by the detection circuit 9 when the contactor 5 is slid in the direction in which the electrodes 2 are arranged, that is, in the longitudinal direction of the resistance layer 4, has the voltage and current amount on the vertical axis. In Fig. 2, which shows the length of movement of the contact on the horizontal axis, it is shown by a broken line, and the contact 5
The maximum value is reached when the contact 5 is positioned directly above the electrode 2, and the minimum value is reached when the contact 5 is positioned between the electrodes 2. The waveform is inversely proportional to the change in the resistance value, and a waveform similar to full-wave rectification of alternating current is obtained. Therefore,
The change in voltage between the bridging part 3 and the contact 5 has a waveform proportional to the resistance value between the bridging part 3 and the contact 5, and as shown by the solid line in FIG. The minimum value occurs when the contactor 5 is positioned directly above the electrode 2, and the maximum value occurs when the contactor 5 is positioned at an intermediate position between the electrodes 2. This change in voltage can be determined by calculation from the change in current obtained by the detection circuit 9, or by directly measuring the voltage between the bridge section 3 and the contact 5. You can ask for it. In addition, the relationship between the width dimension W of the electrode 2, the pitch l, and the thickness h of the resistance layer 4 is as follows: W=1/10l, h=1/5l
When the voltage and current waveforms obtained by the detection circuit 9 are set to a certain value, the voltage and current waveforms obtained by the detection circuit 9 become very close to the sinusoidal waveforms.

According to this embodiment configured in this way, the main parts are composed of the conductor member 1, the resistive layer 4, and the contactor 5, so that it is more effective than the conventional non-contact type detection device using light or magnetism. It can be manufactured at an extremely low cost, and even though it is a contact type, it is possible to obtain an electrical signal that changes continuously, and furthermore, it is possible to reliably prevent chattering caused by the sliding of the contactor 5.

FIG. 3 shows another embodiment of the present invention, and the different parts from FIG. 1 will be explained below.
That is, 10 is a conductor member made by pressing a thin metal plate, and this is formed by recessing the part corresponding to the punched part of the conductor member 1 by a dimension h ₂ than other parts, so that it has a comb-like shape. The convex portion constitutes the electrode 11, and the portion other than the electrode 11 constitutes the bridging portion 12.
A resistive layer 1 is commonly contacted with each electrode 11.
3 is arranged so as to also contact the bottom of the recess between the electrodes 11. And even in this configuration,
By varying the width dimension W of the electrodes 11, the pitch l, the depth _h2 of the recess between the electrodes 11, and the maximum thickness _h1 of the resistance layer 13, arbitrary continuously changing voltage and current waveforms can be obtained. In addition, various effects similar to those described above can be achieved.

In each of the above embodiments, the width dimension V of the resistance layers 4 and 13 was constant, but when the pitch l of the electrodes 2 and 11 is large, the resistance between the adjacent electrodes 2 and 2 and between the adjacent electrodes 11 and 11 is By changing the width dimension V of the layers 4 and 13, it is possible to adjust the form of the output waveform to bring it closer to the desired waveform.In addition, the electrode 2 can be formed by general etching, silver paste printing, etc. It may also be formed by.

As is clear from the embodiments described above, the present invention is a contact type and can be manufactured at low cost, and since the contactor is constantly in sliding contact with the resistance layer,
It is possible to provide a detection device that can obtain an electrical signal that changes continuously, does not cause chattering, and can greatly improve usability.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is a diagram showing output waveforms, and FIG. 3 is a perspective view showing another embodiment of the present invention. It is a diagram. In the drawings, 1 and 10 are conductor members, 2 and 11 are electrodes, 3 and 12 are bridge parts, 4 and 13 are resistance layers, 5 is a contact, 6 is a DC power supply, and 9 is a detection circuit.

Claims (1)

[Claims] 1. A conductor member having a large number of electrodes arranged in parallel at predetermined intervals and a bridge portion that electrically connects the electrodes, a band-shaped resistance layer disposed so that one side is in contact with each of the electrodes, and A contactor is provided on the other side of the resistance layer so as to be slidable in the direction in which the electrodes are arranged side by side, and detection detects a change in resistance value between the bridging portion and the contactor due to the sliding of the contactor. A detection device consisting of a circuit.