JPS5840723A - Relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a relay using an electret.

Conventionally, electromagnetic relays have been commonly used as relays. However, since electromagnetic relays use coils, they consume a lot of power and generate heat, which is a loss. It also has the disadvantage of being heavy and not suitable for small relays.

An object of the present invention is to eliminate the drawbacks of the conventional electromagnetic relays described above, and to provide a relay that is small and lightweight, consumes low power, and generates little heat.

To achieve the above object, the relay of the present invention includes at least one pair of fixed electrodes, a cylindrical rotor disposed between the pair of fixed electrodes, and a rotor attached to the surface of the rotor so as to be able to face the fixed electrodes. The movable contact piece rotates as the rotor rotates, and a fixed contact contacts and separates from the movable contact piece.

The present invention will be described in detail with reference to embodiments shown in the following two drawings.

FIG. 1 is a schematic diagram of a relay showing an embodiment of the present invention. In the figure, a circuit is connected such that a DC voltage is applied from a power source 2 to a pair of fixed electrodes 1a and 1b via a switch 6. The fixed electrodes 1a and 1b are arc-shaped, and a cylindrical rotor 4 is rotatably provided between the two electrodes. Furthermore, electrets 5a and 5b made of, for example, polytetrafluoroethylene-hexafluoropyrene copolymer are attached to the peripheral end of the rotor 4 so as to be able to face the fixed electrodes 1a and 1b.

The electrets 5a and 5b are formed into an approximately four-section arc shape that is concentric with the arc of the fixed electrode, and are arranged approximately symmetrically with respect to the center of the rotor 4 as a base point.

As is well known, electret is + (plus).

In this case, the electrets 5a and 5b each have a charge different in electric polarity from the opposing fixed electrodes 1a and 1b on their surfaces. The rotor 4 is provided with a movable contact piece 6 having a movable contact 6b attached to the tip of a needle 6a that rotates integrally with the rotation of the rotor 4. Note that 7 is a spring for returning the rotor 4.

8 and 9 are fixed contact electrodes, 10 is a common electrode, and 11 is a power source for driving the load circuit.

Now, when the switch 6 is closed, the DC voltage from the power supply 2 is applied to the fixed electrodes 1a and 1b, and the fixed electrode 1a becomes + (plus) and the fixed voltage becomes - (minus).On the other hand, the electrets 5a and 5b Fixed electrode 1a facing the surface
Since the fixed electrode 1a and the electret 5a and the fixed electrode 1b and the electret 5b are charged with an electric charge different from that of the electric polarity of the electret 1b, the fixed electrode 1a and the electret 5b attract each other by electrostatic force, and the electret is urged in the direction of the arrow, and the rotor 4 is Rotate.

As a result, the movable contact 6b of the movable contact piece 6 separates from the fixed electrode 8 and comes into contact with the other fixed contact 9.

As a result, when switch 5 is turned on, power supply 11→load N→
The load circuit that formed a closed circuit with fixed contact 8 → movable contact 6b → needle 6a → common contact 10 → power supply 11 is now connected to power supply 11 →
The circuit is switched to a closed circuit of load I→fixed contact 9→movable contact 6b→needle 6a→common contact 10→power supply 11.

When the switch 3 is turned off, the charges on the fixed electrodes 1a and 1b disappear, so the fixed electrodes 1a and 1b and the electret 5a
- The suction force of 5b disappears, and the rotor 4 returns to its original position by the return force of the return spring 7.

Therefore, the movable contact 6b leaves the fixed contact 9 and comes into contact with the fixed contact 8 again.

In the embodiment shown in FIG. 1, a return spring is used to return the rotor 4 to its original position, but as shown in FIG. A weight 12 for vibration/shock prevention may be attached to the opposite end. By providing this weight 12, the rotor 4 returns to its original position due to the gravity of the weight 12 when the switch B is turned off.

In addition, in the embodiment shown in FIG. 1, the movable contact piece is shaped like a needle, and the movable contact attached to the tip of the movable contact piece contacts and separates from an external fixed contact, but the movable contact piece is rotated integrally with the rotor. As shown in Fig. 3, a movable contact piece is attached to the lower end of the rotor 4.
13, fixed electrodes 1a and 1b are implanted in a base body 14, and fixed contacts 15a and 15b are installed at the bottom of this base body.The movable contact piece 13 is rotated integrally with the rotation of the rotor 4/ to form the fixed contacts. 15a and 15b may be brought into contact with and separated from each other.

Furthermore, in the above embodiment, the pair of electrets is charged with a charge different from the electric charge applied to the opposing fixed electrodes, and the rotor is rotated using electrostatic attractive force. The charges of the opposing fixed electrode and the electret may have the same polarity, and the rotor may be rotated by electrostatic repulsion.

Furthermore, although it is preferable that the fixed electrode be shaped like both arcs as shown in the above embodiment, it may be shaped like a flat plate depending on the case.

As described above, according to the present invention, since the electrostatic force between the electric force applied to the fixed electrode and the charge held by the electret is used to connect and separate the contacts, it is not possible to flow current through the coil etc. Therefore, you can obtain a relay with low power consumption and low heat generation.

In addition, an electret that does not require electrical connection is attached to the rotor, and the input circuit and opposing electrodes that require electrical connection are fixed, making it easy to configure the entire relay. This has the advantage that a long-life relay can be obtained since no

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a relay showing one embodiment of the present invention, FIG. 2 is a diagram showing another example of the rotor return means, and FIG. 6 is a diagram showing another example of the movable contact piece. FIG. 6(a) is a plan view thereof, and FIG. 3(b) is a sectional view thereof. 1a/1b: Fixed electrode, N: Rotor. 5a, 5b: electret, 6, 13: movable contact piece, 6b: movable contact, 8, 9, 15a, 15b = fixed contact, 12: weight. Patent applicant Tateishi Electric Co., Ltd. Agent Patent attorney Shigeru Nakamura

Claims (3)

[Claims] (1) At least one pair of fixed electrodes, a cylindrical rotor disposed between the pair of fixed electrodes, and at least one pair of electrets attached to the surface of the rotor so as to be able to face the fixed electrodes. , a movable contact piece that rotates with rotation of the rotor; A relay comprising a fixed contact that connects and separates from the movable contact piece. (2) The relay according to claim 1, wherein the at least one pair of fixed electrodes is formed in a circular arc shape with a curvature equal to the curvature of the cylindrical rotor. (3) The movable contact piece is formed of a needle-like body, a movable contact is provided at one tip thereof, and a weight for preventing vibration and shock is attached to the other tip. The relay described in paragraph 1.