JP2607663Y2 - Detection coil for proximity switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection coil for a proximity switch used in a high-frequency oscillation proximity switch.

[0002]

2. Description of the Related Art As shown in FIG. 9, a high-frequency oscillation proximity switch includes a detection coil 50 connected to operate as a part of a high-frequency oscillation circuit 51. When the metallic object 52 approaches the detection coil 50, the influence of the influence causes a change in the magnetic flux density B passing through the detection coil 50, which changes the oscillation condition of the high-frequency oscillation circuit 51, and stops the oscillation. Thus, the approach of the object can be detected. When the object is far away, the oscillation condition is restored and the oscillation is resumed.

[0003] The detection coil for a proximity switch (hereinafter simply referred to as a detection coil) used in this manner is known in various configurations. An example of such a configuration is shown in FIG. The detection coil 50 includes a cylindrical portion 31, a winding 32 is wound around the cylindrical portion 31, and is made of a synthetic resin or the like having a lead 33 to which a terminal of the winding 32 is soldered. Insulating bobbin member 30
And a projecting portion 41 corresponding to the tubular portion 31. The projecting portion 41 is inserted into the tubular portion 31 so as to cover the bobbin member 30 and is attached thereto via an adhesive 42. And the formed pot core 40. That is, the pot core 40 is fixed to the bobbin member 30 by the adhesive 42.

[0006] Such a detection coil 50 shown in FIG.
As shown in (2), the bobbin member 30 and the pot core 40 are disposed to face each other, and the two are integrated by inserting the protruding portion 41 into the tubular portion 31 and assembled via the adhesive 42.

When the detection coil 50 is assembled as described above, when the pot core 40 is fixed to the bobbin member 30 via the adhesive 42, the pot core 40 is tilted or lifted because both are in a free state. There is a possibility that it will be fixed in an improper state. In such a state, the detection coil 50
Is assembled, the characteristics, L,
Q and the like vary. In particular, this type of detection coil 50
Since the width of the bobbin member 30 is, for example, about 4 to 6 mm because of its small size, the assembly operation requires a high degree of accuracy, and it is difficult to fix the pot core 40 to the bobbin member 30 in a normal state. Accompanied by

For this reason, as shown in FIG. 8, the pot core 40 is attached to the bobbin 30 with an adhesive 42 when assembling.
When fixing the adhesive 42, the adhesive 42 is hardened and permanently fixed in a state where both are pressed and temporarily fixed. According to this, the pot core 40 is
It is fixed to the bobbin member 30 in a normal arrangement.

[0007]

However, when such a holding jig 45 is used, since the object to be held is a minute component, a jig having a complicated shape must be prepared, so that an increase in cost can be avoided. There is no problem.

The present invention has been made in view of the above problems, and has as its object to provide a proximity switch detection coil that can be assembled without increasing the cost.

[0009]

According to a first aspect of the present invention, there is provided a tubular member having a flange provided at both ends with a winding wound around the cylindrical portion. A bobbin member and a columnar protrusion inserted into the cylindrical portion are provided,
A detection coil for a proximity switch, comprising a pot core having an outer wall portion provided with a fitting groove on a wall surface, wherein a cutout portion is provided in one flange portion of the bobbin member, and a single plate is provided at a side end of the other flange portion. And a plate-like projection made of
A flexible portion is formed in the plate-shaped protrusion so that its side end is formed thinner than the thickness of the central portion , and the notch of the one flange is inserted into the fitting groove of the pot core. In the engaged state, the flexible portion provided on the plate-shaped protrusion of the other collar portion is bent so that the plate-shaped protrusion is fitted into the fitting groove of the pot core, and the pot core is attached to the bobbin member. It is characterized by being fixed.

[0010]

According to the structure of the present invention, the side end of the flange portion of the bobbin member is thinner than the center portion without using a holding jig.
By bending the end of the protruding portion having a flexible portion formed so as to have a shape , the protruding portion is fitted into the fitting groove of the pot core, and the inner wall thereof is pressed and fixed, and this state is temporarily set. Fixed. Subsequently, the pot core is permanently fixed to the bobbin member in such a temporarily fixed state. by this,
Since a holding jig is not used, the cost does not increase.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of a detection coil for a proximity switch according to the present invention.
As shown in FIG. 2, a cylindrical portion 1 provided with flange portions 8 at both upper and lower ends is provided. The winding 2 is wound around the cylindrical portion 1, and a notch portion 8A is formed in a lower end flange portion. A lead 3 to which the end of the winding 2 is soldered is provided on the outside thereof, and a plate-like projection 5 made of a single plate is provided on the side end of the upper end brim 8 of the cylindrical portion 1. columnar but the insulating bobbin member 4 consisting of a pair formed of at least synthetic resin flexible portion 5A to the ends of the plate-like <br/> protrusion 5 is provided, which corresponds to the cylindrical portion 1 A pot core 6 provided with a protruding portion 6A and having a fitting groove 7A in a wall surface 7 is provided with a notch 8A in a lower end brim portion.
The upper end flange 8 is engaged with the fitting groove 7A.
The flexible portion 5A of the plate-shaped protrusion 5 is temporarily fixed by fitting it into the fitting groove 7A of the pot core 6 and pressing the inner wall surface.

[0013] That is, the wall surface 7 of the pot cores 6 and fitting groove 7A is provided in advance fitting the plate-like protrusion portion 5 of the side end of the flange portion 8 of the bobbin member 4, a flexible plate-like projection 5 By bending the portion 5A and positioning it in the fitting groove 7A, the pot core 6 can be temporarily temporarily fixed to the bobbin member 4 easily.

In this case, the upper end flange 8 of the bobbin member 4
As shown in FIG. 5, the end 5A of the plate-like protrusion 5 is a plate-like protrusion.
The end 5A of the part 5 is thinner than the thickness of the center part 5B
By forming the cormorants, when deformed so as to fit it is possible to sufficiently inelastic, may be used as a flexible portion. Further, as shown in FIG. 2, the dimension L1 of the plate-shaped protrusion 5 of the upper flange 8 in the direction in which the plate-shaped projection 5 is brought into contact with the pot core 6 is slightly compared with the dimension L2 between the inner wall surfaces of the fitting grooves 7A of the pot core 6. By choosing large,
When the plate-like protrusion 5 is fitted into the fitting groove 7A, the plate-like protrusion 5
Of the pot core 6 can be firmly temporarily fixed to the bobbin member 4.

Therefore, the bobbin member 4 is temporarily fixed as described above.
While holding the space between the pot core 6 and the pot core 6,
The pot core 6 can be permanently fixed to the bobbin member 4 by curing the adhesive previously applied to the inner wall surface of the bobbin.

According to this embodiment , the end portion 5A which is the flexible portion of the plate-like projection 5 of the upper end flange 8 of the bobbin member 4 can be used without using a holding jig as in the prior art. Since the main fixing is performed in a state where the pot core 6 is temporarily fixed to the bobbin member 4 by the pressing force on the inner wall surface of the fitting groove 7A of the pot core 6, the holding jig is not required. Therefore, the pot core 6 can be fixed to the bobbin member 4 without increasing the cost. In particular, according to the present embodiment, even when assembling the detection coil using the minute parts, the assembling can be performed with high precision, so that the workability can be improved.

Also, as described above, the end of the plate-like projection 5
Any other shape that uses 5A as the flexible part
It may be a shape. That is, FIG. 4 shows another shape of the plate-like protrusion 5 formed on the upper end flange 8 of the bobbin member 4.
The end portion 5A of the plate-like projection 5 is curved more than the center portion 5B.
It illustrates an example in which so as to have flexibility by that. Similarly, FIG. 3 shows the upper end flange of the bobbin member 4.
8 toward the central portion 5B of the plate-shaped protrusion 5
This is an example in which a flexible shape is imparted by forming it in a p-shape . In any case, this end 5A
Shown in FIG. 5 by utilizing
The same effect as the end 5A can be obtained.

Although the shape of the columnar projecting portion 6A of the pot core 6 and the shape of the cylindrical portion 1 of the bobbin member 4 into which the columnar projecting portion 6 is inserted have been described with reference to an example in which it is formed in a cylindrical shape, the present invention is not limited to this.

[0019]

As is apparent from the above description, according to the present invention, a flexible portion is provided at the end of the protrusion formed at the side end of the flange portion of the bobbin member, and the flexible portion is bent. since the pot core by fitting the protrusion into the fitting groove of the pot core and to perform the fixation while temporarily fixed to the bobbin member by, Pottoko a and volume bottles <br/> member without using the fixing jig Can be arranged accurately, so that the cost can be reduced .

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a proximity switch detection coil of the present invention.

FIG. 2 is a perspective view illustrating an assembling method according to the embodiment.

FIG. 3 is a perspective view showing another shape of the plate-shaped protrusion at the side end of the flange of the bobbin member in the embodiment of the present invention .

FIG. 4 is a side view showing another shape of the plate-like protrusion at the side end of the flange of the bobbin member in the embodiment of the present invention .

FIG. 5 is a side view showing a shape of a plate-shaped protrusion at a side end of a flange portion of the bobbin member in the embodiment of the present invention .

FIG. 6 is a sectional view showing a conventional detection coil.

FIG. 7 is an explanatory diagram of a method of assembling the detection coil of FIG. 3;

FIG. 8 is an explanatory view of another conventional method of assembling a detection coil.

FIG. 9 is an explanatory diagram showing an application example of a detection coil.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Winding 3 Lead 4 Bobbin member 5 Plate-shaped protrusion 5A Flexible part 6 Pot core 6A Column-shaped protrusion 7 Wall 7A Fitting groove 8 Collar 8

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 63-23747 (JP, U) JP-A 57-16353 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 36/00 H01F 5/02 H03K 17/95

Claims (1)

(57) [Scope of request for utility model registration] 1. A bobbin member having a cylindrical portion provided with a flange portion at both ends and a winding wound around the cylindrical portion, and a columnar projecting portion inserted into the cylindrical portion are provided. A detection coil for a proximity switch, comprising a pot core having an outer wall portion provided with a fitting groove on a wall surface, wherein a cutout portion is provided in one flange portion of the bobbin member, and a single plate is provided at a side end of the other flange portion. the flexible portion of the side end portion in the plate-like projecting portion to form a plate-like protrusion portion is formed to be thinner than the thickness of the central portion consisting of providing the notch of the one flange portion while remaining engaged in the fitting grooves of the pot core, by deflecting the flexible portion provided on the plate-like projecting portion of the other flange portion, is fitted to the plate-shaped protrusion into the fitting groove of the pot core The proximity switch is characterized in that the pot core is fixed to the bobbin member by Detection coil.