JPH03141531A - Thin type lead relay - Google Patents

Abstract

PURPOSE:To increase the suction force of a lead by forming a swollen part directed to a counter contact surface in a fixed contact so as to increase the facing surface between the contact surface of the fixed contact and the other end of the lead. CONSTITUTION:A fixed contact 24, 25 of magnetic material is of a basic form consisting of a cubic base part 24a, 25a of an almost similar length to the lateral width of a containing part 21f connected with a protruding part 24b, 25b of an almost similar length of the lateral width of a lead 3 at the center of a facing surface. The fixed contacts 24, 25 are disposed vertically along the containing part 21f with a predetermined interval (g) between the end surfaces of the protruding parts 24b, 25b. The fixed contacts 24, 25 has swollen parts 24e, 25e penetrating into a cylindrical part 21a of a coil frame close to contact surfaces including the facing contact surfaces 24c, 25d. In this constitution, the facing surface between the contact surfaces of the fixed contacts and the other end 3b of a lead 3 can be set large, thereby the suction force of the lead can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin reed relay that is mounted on a printed wiring board and used in communication instruments and the like.

[Conventional technology]

Conventional thin reed relays generally have the configurations shown in FIGS.
No. 9). This thing includes a coil frame 1 having a cylindrical part 1a having a predetermined space S inwardly and a flange part 1b on both sides thereof,
The coil 2 is wound around the cylindrical portion 1a of the coil frame, and has a generally long plate shape, with most of the coil 2 being located inside the cylindrical portion 1a of the coil frame, with the base end 3a supported, and the other end 3b. Contact surfaces 3c and 3d alternately correspond to the movement of the magnetic material glue 3 arranged to protrude from the cylindrical portion 1a and the other end 3b of the lead.
Two fixed contacts 4 and 5 made of a magnetic material whose contact surfaces 4c and 5d face each other with a predetermined gap g so that they can come into contact with and separate from the front and back surfaces of the other end 3b, which function as
Permanent magnet 6 inserted insulatively between the ends except for c and 5d.
, 6, an insulating substrate 8 on which are implanted terminals 7a, 7b, 7c electrically connected to the lead 3 and the two fixed contacts 4, 5, and the base end 3a side of the lead and each fixed contact 4.
The main components are yokes 9 and 10 that magnetically couple the yokes 9 and 5.

The lead 3 is supported by having its proximal end 3a fixed by welding or the like to a connection piece of a U-shaped conductive support spring 11 whose opposing piece is supported by an insulating substrate 8.

Therefore, the other end 3b of the lead 3 can be displaced in the thickness direction using the connecting piece base of the support spring 11 or the fixed location of the base end 3a as a fulcrum.

The magnetic flux of the permanent magnets 6.6 in such a relay is as follows: permanent magnets 6, 6 → upper upper chamber constant contact 4 → predetermined gap g ('J-do 3
(including the other end 3b, that is, the contact surface) → lower fixed contact 5
→The first path of permanent magnets 6, 6 and the permanent magnets 6, 6
→Upper yoke 6 (including those via upper fixed contact 4)
→ Proximal end 3a of lead 3 → Lead 3 → Other end 3 of lead 3
The liquid flows through the second path, which is the back surface of b, that is, the lower contact surface → the lower fixed contact 5 → the permanent magnets 6, 6, respectively. Therefore, when the coil 2 is not energized, the lead 3 is attracted to the lower fixed contact 5 and comes into contact with it.

In this state, when the lead 3 is brought into contact with the upper fixed contact 4, the coil 2 is energized so that a magnetic flux flows in a direction that cancels the magnetic flux of the permanent magnets 6, 6.

[Problem to be solved by the invention]

Reed relays are becoming thinner and more sensitive as communication devices and measuring instruments are becoming smaller and thinner (due to the miniaturization of transformers in measuring instruments, etc.).

There is also an increasing demand for high efficiency (virtually synonymous with high efficiency).

In the conventional device described above, there is a predetermined gap g between the re-fixed contacts 4 and 5 in the path of the magnetic flux, and the magnetic resistance at this location prevents high irradiation.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a thin reed relay that can improve sensitivity without sacrificing thickness.

[Means to solve the problem]

The thin reed relay of the present invention has fixed contacts facing each other with a predetermined gap so that the other end of the lead is sandwiched between the contact surfaces.
It has a structure in which a bulge extending into the cylindrical portion of the coil frame is formed in the vicinity of the contact surface including the opposing contact surface.

[Effect]

In the thin reed relay of the present invention, the opposing area between the contact surface of the fixed contact and the other end of the lead can be increased, and the attraction force of the lead can be increased. It will not change.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIG. 1 and FIG. 4. Note that substantially the same members as those described in the related art are designated by the same reference numerals.

Reference numeral 21 denotes a coil frame, which has a basic shape including a cylindrical portion 21a having a predetermined space S inside and flange portions 21b and 21C on both sides thereof. One of the flange portions 21b is provided with vertical grooves 21d and 21e at the top and bottom for supporting yokes, which will be described later. The inner space S is open on the other side of the flange 21c, and is formed as a square hole with a predetermined dimension, extending slightly deeper than the position where the upper and lower vertical grooves 21d and 21e are connected. Ru. The other flange portion 21C is provided with an accommodating portion 21f that communicates with the inner space S, has a sufficiently larger cross-sectional area, and is open axially outward, and further includes upper and lower walls forming the accommodating portion 21f. Recesses 21g and 21h for supporting yokes, which will be described later, are provided on the outer surface of the yoke. In addition, chamfers 21j, 21 are formed on the edges of the square hole forming the space S.
j has been applied.

The coil 2 is wound around the cylindrical portion 21a of the coil frame 21.

The lead 3 is made of a magnetic material and has a roughly long plate shape, and its length is longer than the axial length of the square hole forming the space S, and longer than the sum of the axial lengths of the accommodating portion 21f. short. The base end 3a of the lead 3 is supported by a conductive support spring, which will be described later, so that most of the lead is located inside the cylindrical portion 21a, that is, within the space S. As a result, the other end 3b is
It protrudes from the space S, that is, the cylindrical portion 21a, and can move in the thickness direction using the base end 3a or the base end of the support spring as a fulcrum. On both sides of this other end 3b,
Conductive plating is applied to the contact surfaces 3c and 3d of the leads as movable contacts.

Reference numerals 24 and 25 denote fixed contacts made of a magnetic material, and protruding portions 24b and 25b, which are approximately equal to the width of the lead 3, are attached to the rectangular parallelepiped bases 24a and 25a, each having a length approximately equal to the width of the accommodating portion 21f, at the center in the facing direction. It has a basic shape that is connected to the parts. Both fixed contacts 24 and 25 are arranged in the vertical direction of the housing portion 21f so that the end surfaces of the respective protrusions 24b and 25b face each other with a predetermined gap g. The end faces are conductive plated to form contact surfaces 24c and 25d,
The leads alternately approach and separate depending on the operation of the other end 3b of the lead.

Furthermore, this fixed contact 24.25 has an opposite contact surface 24.
The cylindrical portion 21 of the coil frame is located near the contact surface including c and 25d.
The bulging portion 24e that enters the inside of a, that is, the space S
, 25e are formed. This bulging portion 24e, 2
The side surface of 5e on the cylindrical portion 21a side corresponds to the chamfers 21j and 21j made on the edge of the square hole forming the space S.

Further, the bulging portions 24e and 25e are processed as shown in FIG. 3 or 4. The processing method shown in Figure 3 is based on the rectangular parallelepiped base 2.
The protrusions 24b, 25b of the basic shape consisting of 4a, 25a and protrusions 24b, 25b are formed long, and the protrusions 24b, 25b are bent and cut horizontally at a predetermined position to obtain an end surface. By forming the bulges 24e and 25e, the bulges 24e and 25e can be formed. Conductive plating is applied to these end faces to form contact surfaces 24c and 25d.

The processing method shown in Fig. 4 uses a mold, and the protrusions 24b and 25b of the basic shape consisting of the rectangular parallelepiped bases 24a and 25a and the protrusions 24b and 25b are formed slightly longer, and then processed using the mold. Pressure deforms. The lower mold is formed by forming an abutting surface La, a recess Lb having a depth equal to the final height of the fixed contact 24, 25, and a chamfer Lc corresponding to the shape of the desired bulge on one side of the mouth edge. is formed. Upper mold U
An abutment surface Ua is formed on the abutment surface Ua that abuts the abutment surface La of the lower mold.

Therefore, attach the material of the basic shape of the fixed contact to the lower mold,
When the upper mold U is lowered to butt together, the protrusion 24b
, 25b are deformed, and end faces and bulges 24e and 25e can be formed by the abutting surface Ua and the chamfer Lc.

This end face is plated with conductive plating to form a contact face 24c,
It becomes 25d.

The permanent magnet 6.6 has a rectangular parallelepiped shape and is inserted between the ends of both fixed contacts except for the contact surfaces 24c and 25d. in this case,
The two fixed contacts 24 and 25 must be electrically insulated, so either use an insulating permanent magnetic material or
An insulating material or an insulating sheet is sandwiched between the permanent magnet 6.6 and both fixed contacts 24.25. Further, the magnetization direction is the direction in which both fixed contacts 24 and 25 are arranged.

The insulating substrate 8 corresponds to the housing portion 21f of the coil frame 21 in plan view.
an electrically conductive support spring 11 for supporting the slide 3 that protrudes, and has a size that fits approximately snugly into the spring;
Lead 3 and two fixed contacts 24.2 protruding to the other side
Terminals 7a*, 7b and 7c electrically connected to the terminals 5 are implanted, respectively.

The support spring 11 has opposing pieces 11a and Ila and a connecting piece 11b.
The inner beams of both opposing pieces 11a and 11a are slightly larger than the width of the door 3. And facing pieces 11a, 1
The tip of 1a is attached to the protruding support parts 8a, 8a of the insulating substrate 8,
For example, it is implanted by simultaneous molding, and as described above, the base end 3a of the lead is fixed to the intermediate part of the connecting piece 11b by welding or the like. During the above-mentioned planting, the terminal 7a and the opposing piece 11a
, the terminal 7b and the fixed contact 24 are electrically connected to each other, and the terminal 7c and the fixed contact 25 are electrically connected to each other. Note that the above-described predetermined space S of the coil frame 21 refers to a size that does not impede the operations of the leads 3 and the support springs 11 at least.

Further, the insulating substrate 8 can support the above-described fixed contacts 24 by appropriately setting the vertical and horizontal dimensions of the protruding support parts 8a and 8a.
25 and the permanent magnets 6 and 6 are also positioned.

2 yokes9. IO is made of a magnetic material, and both have approximately the same shape. This yoke 9.10 is similar to the one shown in FIG. 7, and is formed into a U-shape with base pieces 9a, 10a and side pieces 9b, 10b, and further includes side pieces 9b, 9b, 10.
b, a tip piece 9 bent inward at right angles from the 10b end;
c, 9c, 10c.

10c are installed in series. And the yoke 9.10 is the base piece 9
a, 10a are inserted into the vertical grooves 21d, 21e of the coil frame 21, and the tip pieces 9c, 9c, 10c, 10c are fitted into the recesses 21g, 21h of the coil frame 21, thereby being attached to the coil frame 21. As a result, the yoke 9.
Process 0 is the base end 3a side of the lead and each fixed contact 24.
．． 25 will be magnetically coupled.

The above-mentioned main components are housed in a casing (not shown), and each terminal 7a, 7b, 7c and a coil terminal (not shown) are installed. Note that the coil frame 21 is omitted in FIG. 1.

In such a thin reed relay, the permanent magnet 6.
The magnetic flux of 6 is generated from the permanent magnets 6, 6 → upper upper fixed point 24 → predetermined gap g (including the other end 3b of the lead 3, that is, the contact surface)
→ First path of lower fixed contact 25 → permanent magnets 6, 6, permanent magnets 6, 6 → upper yoke 9 (including one via upper fixed contact 24) → base end 3a side of lead 3 → lead 3→The back surface of the other end 3b of the lead 3, that is, the lower contact surface→
The current flows through a second path from the lower fixed contact 25 to the permanent magnet 6.6, respectively. Therefore, when the coil 21 is not energized, the lead 3 is attracted to the lower fixed contact 25 and comes into contact with it.

In this state, when the lead 3 is brought into contact with the upper fixed contact 24, the coil 21 is energized so that a magnetic flux flows in a direction that cancels the magnetic flux of the permanent magnet 6.6.

In such an operation, the contact surface 2 of each fixed contact 24.25
The opposing areas between the leads 4c and 25d and the other end 3b of the lead 3, that is, the contact surfaces 3c and 3d of the lead 3, are larger than in the conventional case (thus, the magnetic efficiency is improved and the attraction force of the lead can be increased).

〔Effect of the invention〕

Since the thin reed relay of the present invention is configured as described above, the opposing area between the contact surface of the fixed contact and the other end of the lead can be increased, and the attractive force of the lead can be increased. There is no need to reduce the space or increase the size, and therefore, the sensitivity can be improved without compromising the thinness.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of essential parts showing one embodiment of the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is an explanatory diagram of the processing method of the fixed contact, and Fig. 4 is:
FIG. 5 is an exploded perspective view of a main part showing a conventional example, FIG. 6 is a sectional view thereof, and FIG. 7 is an overall perspective view from the -ship side. 21・-Coil frame 21a-Cylinder part, 21b, 21C・-
Flange part, 21f--accommodating part, 21j--chamfer, S--space, 2- coil, 3- lead, 3a... base end, 3b... other end, 3
c, 3d-contact surface, 24... upper fixed contact, 24cm contact surface, 24e--
Swelling portion, 25--Lower fixed contact, 25d--Contact surface, 25e
--1 bulging portion, 6.6-permanent magnet, 8--insulating substrate, 9.10--yoke, 11--support spring, g--predetermined gap between fixed contacts.

Claims (1)

[Claims] (1) A coil frame that has a cylindrical part with a predetermined space inside and flanges on both sides, a coil wound around the cylindrical part of the coil frame, and a coil that has a roughly long plate shape and most of which is a coil. A lead made of a magnetic material is positioned inside the cylindrical part of the frame so that the base end is supported and the other end protrudes from the cylindrical part, and can alternately move toward and away from the lead depending on the movement of the other end of the lead. two fixed contacts made of magnetic material whose contact surfaces face each other with a predetermined gap, a permanent magnet inserted insulatively between the ends of both fixed contacts excluding the contact surfaces, and a lead and two fixed contacts. A thin reed relay comprising: an insulating substrate embedded with a terminal electrically connected to a fixed contact; and a yoke magnetically coupling the base end of the lead to each fixed contact. A thin relay characterized in that the contact has a bulge extending into the cylindrical portion of the coil frame near the contact surface including the opposing contact surface.