JPH05217479A - Surface mounting type electromagnetic relay - Google Patents

Abstract

PURPOSE:To suppress deformation, etc., of covers due to the heat at the time of mounting and improve the productivity by making the external connection terminal part visible with eyes and thickening the thickness of the covers without widening the mounting surface area of a realy on a circuit substrate. CONSTITUTION:The external face of circumferential wall of a cover 6 to be mounted on a relay main body 2 is so made as to locate near the region formed in the case the tips of respective external connection terminals 22a-1', 22b-1', 22b-2' of the main body 2 are connected. Also, in the region corresponding to each external connection terminal, a connection region for at least a circuit substrate 4 of each external connection terminal is composed while a recessed part which can be observed with eyes from right above or obliquely above outside is formed. As a result, the thickness of the circumferential wall of the cover 6 except the regions corresponding to the external connection terminals is made thick in the region of the external connection installation, that is, the range of the region where connection electrodes of the substrate 4 are formed. Consequently, deformation and strain and damage of the cover due to the heat at the time of being mounted on the substrate 4 are prevented and the productivity is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a surface mount type electromagnetic relay having a surface cover, and in particular, it is intended to improve productivity by preventing deformation, distortion and damage as a cover due to heat during mounting. The present invention relates to a surface mount type electromagnetic relay.

In recent years, in the field of electronic equipment, in order to meet the demand for downsizing of devices, surface mounting technology is widely used which can be easily mounted on a mounting means of an electromagnetic relay mounted on a circuit board and can occupy a small occupied area. Is becoming popular.

[0003]

2. Description of the Related Art FIG. 3 is a diagram schematically illustrating a configuration example of a conventional surface mount type electromagnetic relay. (3-1) shows the entire configuration together with a circuit board in a perspective view (3-2). 3 is a cross-sectional view of a state of being mounted on a circuit board as seen from the direction of arrow A. FIG.

In the figure, the case where the relay body is of the two-transfer type is taken as an example. In FIG. 3, a surface mount type electromagnetic relay (hereinafter, simply referred to as a relay) 1 includes a relay body 2 and a cover 3 made of a resin molded product and mounted on the relay body 2.

In this inner relay main body 2, an electromagnet 21 and two contact spring sets 22 which are operated by an attractive force generated in the electromagnet 21 when the electromagnet 21 is energized and the electromagnet 21 and the contact spring set 22 are fixed. And a base substrate 23 that

Two external connection terminals (only one on each side is shown) connected to a coil (not shown) of the electromagnet 21.
By applying a required electric potential between 21a, one side of the two yoke pieces 21b- ₁ and 21b- ₂ (21b- _{1 in} the figure, which are engaged with the electromagnet 21).
_The armature 21c (only the free end part that reciprocates in the figure) that is constantly in contact with _-1 ) is attracted to the other yoke piece 21b _-2 .

The external connection terminal 21 connected to the coil
a is the outside after penetrating the base substrate 23 for fixing the electromagnet 2.
It is formed as a surface-mounting terminal bent to the side.
On the other hand, the above yoke piece 21b_-1, 21b_-2Located on both sides of the existence area
The two contact spring sets 22 are the electromagnets 21 of the base substrate 23.
Placed fixed at one end so as to face both sides of the fixed position
Two tongue-shaped movable contact springs 22a_-1, 22a_-2When
Each movable contact spring 22a_-1, 22a_-2On both sides near the free end of
Fixed contact plate 22b arranged facing _-1, 22b_-2And 22c
_-1, 22c_-2And fixed at a right angle to the armature 21c above
Card 22d that moves with
22d Longitudinal movable contact spring 22a described above_-1, 22a_-2When
The movable contact springs are provided in the grooves formed at the corresponding positions.
Inserted and configured.

Therefore, when the armature 21c reciprocates between the yoke pieces 21b- ₁ and 21b- ₂ , the armature 21c is reciprocated.
Moving contact spring 2 by card 22d reciprocating with c
2a _-1 , 22a _-2 can be bent in the reciprocating direction.

When a potential is applied to the electromagnet 21,
In the normal state, that is, the armature 21c has a yaw on one side.
Piece 21b_-1Movable contact spring 22 when in contact with
a_-1, 22a _-2Fixed contact plate 22b_-1, 22c_-1Contact with
In addition, when electric potential is applied to the electromagnet 21,
The armature 21c is the other yoke piece 21b._-2In contact with
When each of the movable contact springs 22a_-1, 22a_-2Each is solid
Constant contact plate 22b_-2, 22c_-2To come into contact with.

The movable contact spring 22a_-1, 22a_-2Each external connection
Continuation terminal 22a_-1′, 22a_-2′ (22a in the figure_-1′ Only)
Each fixed contact plate 22b_-1, 22b_-2, 22c_-1, 22c_-2External connection terminal
 22b _-1′, 22a_-2′, 22c_-1′, 22c_-2′ (22b in the figure_-1′, 2
2c_-1′, 22c_-2'Is written) and both are connected to the above coil.
The same as the external connection terminal 21a
It is formed on the surface-mounting terminal that is bent rearward and outward.

Therefore, by applying or releasing the electric potential to the electromagnet 21, switching between the two circuits can be realized. On the other hand, the bottomed box-shaped cover 3 is formed so that it can be positioned and fixed to the base substrate 23 by the step surface 3a formed inside the opening of the peripheral wall thereof. After fitting around 23, the relay 1 shown in the figure can be constructed by passing through fixing means such as adhesion.

4 is a circuit board in which connection electrodes 4a are pattern-formed at positions corresponding to the external connection terminals, and the connection electrodes 4a and the external connection terminals of the relay 1 are made to correspond to each other. At the position, the relay 1 is lowered as shown by an arrow B and mounted on each connection electrode 4a, and then the both are connected by a soldering means such as a normal reflow technique, as shown in (3-2). Can be mounted on the circuit board 4.

In the relay 1 having such a structure, each external connection terminal area after being mounted on the circuit board 4 can be visually observed in a range of C, for example, so that it is possible to easily inspect the connection state in the area.

[0014]

However, with the increasing demand for miniaturization of electronic devices, the size of various electronic devices and relays must be reduced, and therefore the relay body 2 must be accommodated in a cover as small as possible. I won't.

On the other hand, in order to inspect the mounting state on the circuit board, the external connection terminal region must be exposed so as to be visible. Therefore, as a result, the thickness of the cover is reduced to about 1 mm or less.

However, in a relay having such a thin cover, the heat applied during mounting on the circuit board may deform the vicinity of the external connection terminal of the cover or cause distortion or damage to the shape of the cover as a whole. However, such deformation, distortion, damage, etc. may cause contact with or extremely close to the relay body constituent members located close to the inner surface of the cover. However, there is a problem that the deterioration of the characteristics may be induced.

[0017]

SUMMARY OF THE INVENTION The above-mentioned problems are formed so that a plurality of external connection terminals led out from a relay body are bent along the outside and are formed along a surface of a circuit board to be mounted, and a circuit board of the relay body. The surface mount type electromagnetic relay is configured by covering the entire periphery except the area facing with the above with a cover made of a box-shaped resin molded product with a bottom so that the connection area of the external connection terminal to the circuit board is exposed. The outer surface of the peripheral wall of the cover mounted on the relay body is formed so as to be located in the vicinity of the area formed when the tips of the external connection terminals of the relay body are connected, and In the corresponding area, at least the connection area of each of the external connection terminals to the circuit board is provided with a concave portion that can be seen from directly above or obliquely above the outside. It is achieved Te.

[0018]

[Operation] If the thickness of the cover is increased without increasing the mounting area for the circuit board as a relay after making the external connection terminal visible, the deformation of the cover due to heat during mounting, distortion and damage may occur. Can be suppressed.

Therefore, in the present invention, at least the thickness of the peripheral wall of the cover mounted on the relay main body is increased to the extent that it does not exceed the region formed when the tips of the external connection terminals of the relay main body are connected together. In a region corresponding to the external connection terminals, each external connection terminal is formed so that its thickness is reduced to almost the same thickness as the conventional one so that the external connection terminals can be viewed from directly above or obliquely above.

Therefore, the thickness of the cover can be increased without increasing the mounting area for the circuit board as the relay and without suppressing the inspection work of the mounting state, and the deterioration of the appearance quality and the deterioration of the characteristics described above can be achieved. It is possible to improve productivity by preventing the above.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an example of the structure of a relay according to the present invention. Like FIG. 3, (1-1) is a perspective view of the entire structure together with a circuit board, and (1-2) is a circuit board. Show the mounted state A
It is a cross section viewed from the direction.

FIG. 2 is a diagram showing another configuration example. In each of the drawings, the case where the relay main body is a two-transfer type similar to that of FIG. 3 is taken as an example, and thus the same target members as those of FIG.
The description overlapping with is omitted.

In FIG. 1, the relay 5 is composed of the relay main body 2 described in FIG. 3 and a cover 6 made of a resin molded product and mounted on the relay main body 2. In particular, in this case, the cover 6 has an area where the thickness of the two surfaces of the peripheral wall on the external connection terminal lead-out side corresponds to the external connection terminal (for example, the area for the external connection terminal 22b- ₁ ', the external connection terminal 22b). _-2 'is a region, and external connection terminals 22a- ₁ ' is a region excluding the region), and linear projections 6a ₁ , 6a ₂ , 6a ₃ , ... along the height direction of the cover 6 are formed.
The outer surface of each of these linear protrusions 6a ₁ , 6a ₂ , 6a ₃ ...
2b _-1 ′, 22b _-2 ′, 22a _-1 ′ ... are located at a position retracted from the tip.

Therefore, when the relay 5 equipped with the cover 6 having such a configuration is viewed from directly above as shown by an arrow D ₁ , the external connection terminal 22b _{-1 is provided} between the adjacent protruding portions 6a ₁ , 6a ₂ , 6a ₃ ... ′, 22b
_-2 ', 22a _-1 ' ... will be visually observed.

Therefore, with the external connection terminals of the relay 5 and the connection electrodes 4a on the circuit board 4 described with reference to FIG. Place it on the top of the relay and connect it to each other by soldering means such as ordinary reflow technology as shown in (1-2).
Can be mounted on the circuit board 4.

In such a relay 5, the thickness of the peripheral wall of the cover 6 excluding the external connection terminal corresponding region is formed thicker within the external connection terminal arrangement region and further within the connection electrode formation region of the circuit board 4. It is possible to suppress deformation due to heat at the time of mounting, distortion / damage of the entire cover, deterioration of appearance quality and deterioration of characteristics as a relay due to these, and each external connection terminal area after mounting on the circuit board 4. Can be visually checked in the range of arrow E, so that the quality of the connection state in the area can be easily inspected.

In FIG. 2 showing another configuration example, the relay 7 is shown in FIG.
The relay main body 2 and the cover 8 made of a resin molded product mounted on the relay main body 2. The cover 8 in this case has the protrusions 5a ₁ , 5a ₂ , 5a ₃ described in FIG.
, Etc. are formed on the peripheral wall surface described in FIG. 1 so as to have a comb-like shape with the bottom surface (upper surface in the figure) as the connecting side when viewed from the front.

Therefore, in the relay 7 to which the cover 8 is attached, the external connection terminals 22b _-1 ′, 22b _-2 ′, 22a _-1 ′, etc. are visually observed when viewed from directly above the relay 7 as indicated by arrow D _2. Although not possible, the external connection terminals can be visually observed from an oblique direction as indicated by arrow D ₃ .

Therefore, as in FIG. 1, with the external connection terminals of the relay 7 and the connection electrodes 4a on the circuit board 4 described in FIG. 3 aligned, the relay 7 is lowered as indicated by arrow B. Then, the relay 7 can be mounted on the circuit board 4 as shown in (2-2) by mounting the relay 7 on the circuit board 4 and connecting them by soldering means such as a normal reflow technique.

In the relay 7, since the thickness of the portion of the cover 8 excluding the area near the external connection terminals is formed thicker within the area of the external connection terminal arrangement area and further, the connection electrode formation area of the circuit board 4, it is mounted. The deformation of the cover due to heat, the distortion and damage of the shape of the entire cover, the deterioration of the appearance quality and the deterioration of the characteristics of the relay due to these can be further suppressed as compared with the case of FIG. 1, and the circuit board 4 is mounted. Since each subsequent external connection terminal area can be visually observed in the range of arrow F, the quality of the connection state in the area can be easily inspected.

[0031]

As described above, according to the present invention, it is possible to provide a surface mount type electromagnetic relay which improves the productivity by preventing the cover from being deformed, distorted or damaged by heat when it is mounted on a circuit board. You can

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a relay according to the present invention.

FIG. 2 is a diagram showing another configuration example.

FIG. 3 is a diagram schematically illustrating a configuration example of a conventional surface mount type electromagnetic relay.

[Explanation of symbols]

2 Relay body 4 Circuit board 4a Connection electrode 5,7 Surface mount type electromagnetic relay 6,8 Cover 6a ₁ , 6a ₂ , 6a ₃ Linear protrusion 22a _-1 ′, 22b _-1 ′, 22b _-2 ′ External connection terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takanori Tanaka, 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Shinichi Sato, 1015, Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (1)

[Claims] 1. A plurality of outer parts derived from the relay body (2)
Part connection terminal (22a_-1′, 22b_-1′, 22b_-2′…) Is bent outward
Is formed along the surface of the circuit board to be mounted after
The area of the relay body (2) facing the circuit board (4) is removed.
All surroundings are the external connection terminals (22a_-1′, 22b_-1′, 22b_-2′
...) so that the connection area for the circuit board (2) is exposed
Covered with a cover (6) consisting of a box-shaped resin molding with a bottom.
The surface mount type electromagnetic relay is made up of: the outer surface of the peripheral wall of the cover (6) mounted on the relay body (2) is
Each external connection terminal (22a_-1′, 22b_-1′, 22b
_-2′…) Near the area range formed when the tips are connected
It is formed so that it is located at
Child (22a_-1′, 22b _-1′, 22b_-2’…)
Each external connection terminal (22a_-1′, 22b_-1′, 22b_-2′…)
The connection area for the circuit board is directly above or obliquely above the outside
Must be configured with a recess that can be seen from the
Surface mount type electromagnetic relay featuring.