JPS6238265Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reed switch used to open and close various electronic circuits, and particularly to a reed switch suitable for use in circuits that open and close at short pulse intervals.

Compact reed switches that open and close electric circuits magnetically are broadly classified into dry type reed switches and wet type reed switches that contain mercury, and are generally used as communication line switches for electronic switching or for input/output of computers. It is widely used in departments, etc.

By the way, in a reed switch according to the prior art, for example, a normal wet type reed switch, as shown in FIG. The mercury 5 and hydrogen gas are sealed and fixed in a glass container 6 with mercury 5 and hydrogen gas facing each other with a gap.
Such a reed switch generates a magnetic attraction force between the electrode lead 1 and the electrode piece 4 by applying a magnetic field from the outside in the axial direction of the electrode lead 1, so that the electrode piece 4 acts as a movable contact. A switch circuit is closed by contacting the contact portion 3 of the electrode lead 1. Further, when the magnetic field is removed, the electrode piece 4 returns to its original position by its elastic force, and a switch operation is performed in which the contact is separated and the circuit is opened.

However, in the above-described switch operation, when the electrode piece 4 in the closed state is opened, there is a phenomenon in which the electrode piece 4 repulsively vibrates due to its elastic force. Therefore, when such a reed switch is opened and closed at short time intervals, for example, if the next closing operation is applied before the vibration of the opened electrode piece 4 has not attenuated and disappeared, the contact 3 of the electrode lead 1
There is a problem in that a malfunction occurs in which the electrode pieces 4 that have been closed immediately open again instantaneously. For this reason, conventional reed switches have the disadvantage of being unable to shorten the time from the rise to fall of the magnetic field applied from the outside, or to respond accurately to short pulse-like repeated opening and closing operations. Ta.

In order to eliminate the above-mentioned conventional drawbacks, the present invention provides a movable switch in a switch configuration in which the contact tips of a pair of fixed contact side electrodes and a movable contact side electrode are arranged facing each other with a certain space interposed so as to overlap each other. A combination buffer member consisting of a spring lead and a shock absorbing spring whose one end is fixed along the surface of the spring lead is arranged at the open position of the electrical circuit of the contact side electrode,
The contact tip of the movable contact side electrode comes into contact with the buffer member during the circuit opening operation, so that the vibration is quickly absorbed and terminated, and the reed switch can accurately open and close without malfunctioning in a short time interval. The purpose is to provide

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a sectional view of essential parts showing one embodiment of the reed switch according to the present invention, and FIG. 3 is an enlarged view of the vicinity of the movable contact side electrode in FIG.
In the present invention, as can be understood from both FIG. 2 and FIG. A pair of leads, that is, the contact part 3 of the electrode lead 1 on the fixed contact side and the electrode piece 4 on the movable contact side attached to the sealed tube 2 are arranged so as to face each other with a certain distance. A meandering shock absorbing spring 21 made of a non-magnetic material is held near the back side of the electrode piece 4 by a fixing part 23 of a spring lead 22, and is arranged approximately parallel to the electrode lead 1 as shown in the figure. do. The spring lead 22
The other end is fixed to the wall of the sealed container 6. Reference numeral 5 indicates mercury sealed together with hydrogen gas in the sealed container 6, and 24 indicates an insulating spacer for positioning the spring lead 22.

If the reed switch (wet type reed switch in this case) has a structure in which the shock absorbing spring 21 is attached near the back side of the movable contact side electrode piece 4 as described above, for example, the contact portion 3 of the electrode lead 1 and the When the electrode piece 4 in the formed state is separated, when the electrode piece 4 generates repulsive vibration due to its elastic force and collides with the shock absorbing spring 21, the shock absorbing spring 21 The vibration of the electrode piece 4 is absorbed and attenuated by sliding friction at point A, and the vibration phenomenon can be quickly terminated. Therefore, according to this embodiment, the reed switch can accurately perform opening and closing operations at short intervals without malfunctioning as in the conventional case. Furthermore, even if the movable contact side electrode piece 4 is in reliable contact with the shock absorbing spring 21 in the open position, there is a slight gap so that the movable contact side electrode piece 4 comes into contact with the shock absorbing spring 21 during vibration during the opening operation. good.

In addition, in the above embodiment, an example was explained in which a wet type reed switch was used.
It goes without saying that the essence of the present invention is not limited to this type of reed switch, but can also be applied to, for example, a dry reed switch or a self-holding type reed switch in terms of functionality.

As is clear from the above description, the reed switch according to the present invention is capable of quickly attenuating and terminating the vibration of the movable contact side electrode piece as described above.
It becomes possible to perform accurate opening and closing operations without malfunctioning in the short time between the rise and fall of the added magnetic field, and it is possible to provide highly reliable reed switches and reed relays. In particular, it is extremely advantageous to apply this embodiment to a self-holding type reed switch.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a conventional reed switch, FIG. 2 is a cross-sectional view of a main part of an embodiment of a reed switch according to the present invention, and FIG. FIG. 2 is an enlarged view of a main part showing the vicinity of an electrode. In the figure, 1 is the fixed contact side electrode lead, 2 is the enclosed tube, 3 is the contact part, 4 is the movable contact side electrode piece, 5
is mercury, 6 is a sealed container, 21 is a shock absorption spring, 2
2 indicates a spring lead.

Claims (1)

[Claims for Utility Model Registration] In a switch configuration in which the contact tips of a pair of fixed contact side electrodes and a movable contact side electrode are arranged facing each other with a certain space interposed so as to overlap each other, the above movable contact side electrode A combination buffer member consisting of a spring lead and a shock absorbing spring whose one end is fixed along the surface of the spring lead is disposed at the circuit opening position of the circuit, and the contact tip of the movable contact side electrode during the circuit opening operation When the lead contacts the shock absorbing spring, the shock absorbing spring partially contacts and slides against the opposing spring lead, thereby damping vibrations of the movable contact side electrode. Switch.