JPH0412585Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a reed relay, and in particular to a miniaturized reed relay equipped with a case that forms a mounting screw hole for firmly fixing it to a circuit board. Regarding.

(Summary of the invention) In order to achieve miniaturization, the present invention provides an offset gap type reed switch in which the center of the reed contact is shifted to one side, a bobbin around which a coil is wound, and the bobbin is connected to the The reed switch is formed to be shorter than the reed switch, and is placed on one side so that the center of the coil and the center of the contact of the reed switch substantially coincide with the longitudinal direction of the case, and the reed switch is not located where the bobbin is located. The case is configured to be mounted with a mounting screw insertion hole located on the side.

(Prior Art) Conventionally, as shown in FIG. 5, this type of reed relay has a center gap type reed switch 1 with the reed contact center located in the center, and is provided in a case 2.
A bobbin 4 with a coil 3 wound around it is arranged around the reed switch 1. Generally, the case does not have mounting screw insertion holes, and is fixed to a printed circuit board using the wiring at the terminal. It was something that would be done.

(Problems to be Solved by the Invention) However, since the conventional reed relay is attached and fixed to the printed circuit board by wiring at the terminal portion, the attachment strength is not sufficient. Further, even if other measures are taken to increase the mounting strength, as equipment becomes smaller, reed relays as parts for mounting on printed circuit boards also need to be made smaller.

(Means for solving the problem) In order to solve the above problem, the present invention has an offset gap type reed switch in which the center of the reed contact is offset to one side, and a coil is wound inside the case. A bobbin is provided, the bobbin is formed to be shorter than the reed switch, and the bobbin is placed on one side with respect to the longitudinal direction of the case so that the center of the coil and the center of the contact of the reed switch substantially coincide with each other, and The case is mounted so that the mounting screw insertion hole is located on the side of the switch, and in a location where the bobbin is not located.

(Function) According to the present invention, an offset gap type reed switch in which the center of the reed contact point is offset to one side is provided in the case, and a bobbin wound with a coil shorter than the reed switch is connected to the center of the coil. Attach the case so that the mounting screw insertion hole is located on the side of the reed switch where the bobbin is not installed, and insert the screw into the mounting screw insertion hole, and then attach it to the printed circuit board. Fix firmly.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Figure 1 is a side sectional view of the reed relay of the present invention.
FIG. 2 is a plan sectional view of the reed relay, FIG. 3 is an exploded perspective view of the reed relay, and FIG. 4 is a diagram showing the relationship between the coil position and magnetic flux density of the reed relay.

In these figures, a terminal 12 is fixed through the base 11, and raised portions 13 and 14 are formed approximately in the center and on one side of the upper surface of the base 11, and a recess is formed in the upper part of the raised portions 13 and 14. A bobbin, which will be described later, is fitted and fixed due to the uneven relationship. An offset gap type reed switch 15 in which the center of the reed contact is offset to one side is surrounded by a bobbin 17 around which a coil 16 is wound and formed shorter than the reed switch 15. They are arranged so that their centers almost coincide. Convex projections are formed on both side surfaces of the bobbin 17, and are fitted and fixed into the recesses of the upright portions 13 and 14 described above. The upper end of the terminal 12 and both ends of the coil 16 and reed switch 15 are connected by a connecting wire 18. Furthermore, an insulating sheet 19 is provided between the terminal 12 and the coil 16 to prevent short circuits. Further, a box-shaped case 20 is provided with a mounting screw insertion hole 21 located on the side of the reed switch 15 where the bobbin 17 is not provided,
The protrusion 11a provided on the base 11 and the case 20
The case 20 is fitted with the engagement hole 22 provided in the case 20.
is fixed to the base 11. Therefore, the mounting screw insertion hole 21 can be provided near the center of the case 20.

This case 20 can be configured to be a magnetically shielded case made of a resin material to which magnetic powder or the like is added, and the mounting screws 23
The influence of external magnetism can be reduced by connecting it to the ground line through.

Next, looking at the reed switch, as shown in Figure 4, the magnetic flux density is high near the center of the coil 16, and by making the center of the coil and the center of the reed contact approximately the same, magnetic efficiency is increased. Usable.

In this way, since it is not necessary to surround the entire reed switch with a coil, the mounting screw insertion hole 21 can be provided in a place where the coil is not provided, and the space can be used effectively and the space factor can be increased. can.

It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the invention) As described above in detail, according to the invention, the following effects can be achieved.

(1) A reed switch in which the center of the reed contact is offset to one side, and a bobbin wound with a shorter coil than the reed switch are provided, and the bobbin is formed to be shorter than the reed switch, and A case in which the center of the coil and the center of the contact of the reed switch are arranged on one side so that they substantially coincide, and the case has a mounting screw insertion hole on the side of the reed switch where the bobbin is not provided, that is, at a position away from the coil. , the reed relay can be firmly fixed to the board, there is no unused space, and the width of the case can be reduced, providing a more compact reed relay. can.

(2) Use a reed switch in which the center of the reed contact is offset to one side, that is, an offset gap type reed switch, and move the coil in the same direction from the center of the case so that the center of the coil approaches the center of the reed switch contact. Because they are arranged in a staggered manner, the center of the coil, where the highest magnetic flux density can be obtained, can be moved closer to the center of the reed switch's contact point, resulting in a rational configuration.This allows the magnetic field to work efficiently, increasing the magnetomotive force of the relay. It is possible to obtain a reed relay that contributes to lower power consumption.

(3) Since the mounting screw insertion hole is provided near the center of the case instead of at the edge, it is possible to print the reed relay by inserting the screw into the hole, despite the weight of the coil etc. inside the case. By tightening it to a board, for example, even if it is mounted on a device that is subjected to vibrations or strong shocks, it is possible to completely prevent accidents caused by breakage or peeling of the solder part from the printed wiring board, etc. due to wobbling or coming off.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the reed relay of the present invention.
Fig. 2 is a plan sectional view of the reed relay, Fig. 3 is an exploded perspective view of the reed relay, Fig. 4 is a diagram showing the relationship between the coil position and magnetic flux density of the reed relay, and Fig. 5 is a diagram of the conventional reed relay. FIG. 3 is a front sectional view of the reed relay. 11... Base, 11a... Protrusion, 12... Terminal, 13, 14... Standing part, 15... Reed switch, 16... Coil, 17... Bobbin, 18
... Connection wire, 19 ... Insulating sheet, 20 ... Case, 21 ... Mounting screw insertion hole, 22 ... Engagement hole, 23 ... Mounting screw.

Claims (1)

[Scope of utility model registration request] A reed relay is configured such that a reed switch is disposed inside a case and is opened and closed by energizing a coil, and the reed switch has an offset gap type reed switch in which the center of the reed contact is biased to one side and the coil is disposed inside the case. A wound bobbin is provided, the bobbin is formed shorter than the reed switch, and is moved to one side so that the center of the coil and the center of the contact of the reed switch substantially coincide with the longitudinal direction of the case. 1. A reed relay according to claim 1, wherein the case is arranged such that a mounting screw insertion hole is located on a side surface of the reed switch where the bobbin is not located.