JP2000216019A - Small-sized plunger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect an end of a winding from disconnection when an external force works on a terminal, in a small-sized plunger having an inserting terminal at an end of a bobbin. SOLUTION: An engaging part 16a is provided on the outer side of the other end of a cylindrical part in the side in which an end 4a of a winding 4 pulled down from an upper surface side of a bobbin 1 is connected to a winding binding-up part 6a. The engaging part 16a is provided at a position lower than that of the binding-up part 6a, and the end 4a of the winding pulled out from the cylindrical part is hooked to bind on the binding-up part 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, aperture control and shutter control of a camera, tape rotation direction control, start and stop control in audio equipment and video equipment, home appliances, office appliances, and the like. The present invention relates to a small plunger used for equipment and the like.

[0002]

2. Description of the Related Art FIG. 5A is a plan view showing an example of a conventional small plunger, FIG. 5B is a side sectional view showing a state in which the small plunger is attached to a device, and FIG.
FIG. 6B is a perspective view showing a mounting structure of the terminal, and FIG. 6B is an explanatory view of a method of mounting the terminal.

As shown in FIGS. 5A and 5B, this plunger comprises a bobbin 1, a U-shaped yoke 2, an attraction piece 3 made of a magnetic material, and a winding wound around the bobbin. 4 and a permanent magnet 5 fixed to the base 2b of the U-shaped yoke 2.

In this plunger, when the attracting piece 3 is attracted by the magnetic force of the magnet 5 and the winding 4 is energized to generate a magnetic flux in the opposite direction to cancel the magnetic flux of the magnet, the mounting hole of the attracting piece 3 is formed. The operation is such that the suction piece 3 is separated from the yoke 2 by the force of a spring (not shown) connected to 3a.

The yoke 2 includes a base 2 having a mounting hole 2a.
b, and a pair of legs 2c formed to protrude from the base 2b, forming a U-shape. The suction piece 3 also has a U-shape having a pair of legs 3b.

The bobbin 1 has a pair of cylindrical portions 1a and 1b into which a pair of legs 2c of the yoke 2 and a pair of legs 3b of the suction piece 3 are inserted. At one end of each of the tubular portions 1a and 1b, flange portions 1c and 1d are formed so as to be bent in a U-shape by a thin portion 1x. L-shaped terminals 6 and 7 are attached to the other ends 1e and 1f of the cylindrical portions 1a and 1b. The leg 2c of the yoke 2 is the cylindrical portion 1 of the bobbin 1.
a and 1b are inserted and fixed from the other end portions 1e and 1f sides. The leg 3b of the suction piece 3 is connected to the common flange 1c, 1
It is inserted and mounted from the d side.

The terminals 6 and 7 are connected to the other end 1 of the cylindrical portion 1a as shown by the terminal 6 in FIGS. 6A and 6B.
It is fixed by pushing it into the mounting hole 1h provided in e from below. Substrate 12 for terminals 6 and 7 (see FIG. 5B)
Connection portions 6b and 7b to an external circuit, such as, project from the upper surface side of the bobbin 1. In this specification, these connection portions 6
The side protruding toward the b, 7b side is the upper part, but it goes without saying that when the plunger is attached to the device, the connecting parts 6b, 7b side are not necessarily the actual upper part. The connecting portions 6a and 7a for connecting the ends 4a and 4b of the winding 4 are
It is provided so as to protrude from the outer surface of the other end portions 1e and 1f. The reason why the barbs 6a and 7a protrude to the outer side is that there is no space inside for providing such barbs 6a and 7a. The reason why the terminals 6 and 7 are of the plug-in type is that they can be manufactured at a lower cost than when the terminals 6 and 7 are fixed by integral molding.

The fixing of the terminals 6 and 7 is performed before the winding 4 is applied. The winding 4 is applied to the cylindrical portions 1a and 1b while the cylindrical portions 1a and 1b are linearly extended.
By passing the intermediate portion of the winding 4 with the flanges 1c and 1d,
Wound as a series. The both ends 4a, 4b are wound around the barbs 6a, 7a of the terminals 6, 7, respectively, and are fixed by the solder 8. In this case, since the winding 4 is wound in a series and the magnetic flux generation direction is formed in a loop shape, one end 4a of the winding 4 is pulled down from the upper surface of the bobbin 1 to the lashing portion 6a, and the lashing portion 6a is pulled down. The other end 4b of the winding 4
Is pulled up from the lower surface of the bobbin 1 to the lashing portion 7a, is lashed to the lashing portion 7a, and is fixed by the solder 8, respectively.

[0009]

As shown in FIG. 5B, the plunger is fixed to a chassis 11 by a fixing tool 10 inserted into a mounting hole 2a of the yoke 2, and is fixed to a through hole 13 of a substrate 12. Pass the terminals 6 and 7 to the substrate 12
When the soldering iron 14 is used to fix the terminal 6, 7 to the terminal 6, the operator contacts the terminal 6, 7 and pushes the terminal 6, 7 as shown by the arrow F. Is inserted from below, the terminals 6 and 7 are pushed down, and the end of the winding 4 is pulled down from the upper surface of the bobbin 1 so that the end of the winding 4a has a diameter of 0.1 mm.
There is a problem that the end 4a of the winding 4 formed of a thin wire of about 1 mm is broken. In particular, when the bobbin 1 is made of a bendable thermoplastic resin as described above, the terminal 6 is melted by the heat transmitted from the soldering iron 14 through the terminal 6 so that the terminal 6 is melted even with a slight force applied to the terminal 6. It tends to shift downward.

The present invention has been made in consideration of the above circumstances, and has as its object to provide a small-sized plunger having a configuration in which disconnection is avoided even if a terminal is lowered due to a pressing force acting on a terminal protruding above a bobbin. .

[0011]

According to the present invention, in order to achieve the above object, the legs of a U-shaped yoke are inserted into a pair of cylindrical portions of a resin bobbin, and the terminals are connected to the yoke base of the bobbin. A small plunger attached to the side end, one end of the terminal protrudes from the upper surface of the bobbin, and the barb to which the winding end is connected protrudes from the outer surface of the bobbin. A locking portion for hooking a winding end portion is provided at a position lower than the barb on the side pulled down from the bobbin upper surface side.

As described above, if the winding end is pulled down to the locking portion provided on the end of the bobbin on the terminal mounting side, and pulled up from the locking portion to the lashing portion of the terminal, the structure can be used.
Even if the terminal is pushed down, the tension at the winding end is not applied,
Disconnection can be prevented.

[0013]

FIG. 1A is a plan view showing an embodiment of the plunger of the present invention, and FIGS. 1B and 1C are views taken along arrows E and F of FIG. 1A, respectively. FIG. In FIG. 1, the same reference numerals as those in FIG.
Omit duplicate descriptions. Reference numeral 1 denotes a bobbin made of a thermoplastic resin that can be bent at the thin portion 1x. The difference between the plunger of FIG. 1 and that of FIG. 5 is that a protrusion 16 is provided on the protruding surface of the barb 6a, which is the side surface of the end 1e of the bobbin 1 on which the terminal 6 is mounted. And the locking portion 16a of the end 4a of the winding 4 which is pulled down.

FIG. 2 is an enlarged perspective view showing the projection 16 and the terminal 6, and FIG. 3 is a side view. As shown in FIG. 3, the locking portion 16a is
Set to a lower position.

In this small-sized plunger, the winding 4 is connected to the bobbin 1
4A, as shown in FIG.
Are linearly extended, and the windings 4 are sequentially applied to these cylindrical portions 1a and 1b. End 4a which is rolled down from above winding 1
As shown in FIG. 2 and FIG.

Thereafter, as shown in FIG. 4B, the leg portions 1a and 1b of the bobbin 1 are bent at the thin portion 1x into a U-shape, and the yoke 2 and the suction piece 3 are mounted.

As described above, the end 4a of the winding 4 which is pulled down from the upper surface of the bobbin 1 and hangs on the buckling portion 6a is hung on the locking portion 16a formed by the projection 16. If the terminal 6 is applied with a force F by the soldering iron 14 or the like from above as shown in FIG. Since no tension is applied to the end 4a of the wire 4, disconnection is prevented.

Since the other winding end 4b is pulled up from the lower surface side of the bobbin 1 and hangs on the hanging portion 7a of the terminal 7, even if a force is applied from above, tension is applied to this end 4b. There is no need to provide a locking portion consisting of the projections 16 and the like because they do not add. However, in consideration of the fact that the end 4b on the terminal 7 side is wound so as to be pulled down from the upper surface side of the bobbin 1, a structure in which the projection 16 is also provided on the end 1f on the terminal 7 side of the bobbin 1 may be adopted. Further, the locking portion 16a may be formed by a groove.

The present invention is preferably implemented when the diameter of the winding 4 is in the range of 0.05 mm or more and 0.12 mm. If the diameter of the winding 4 is less than 0.05 mm, it is difficult to perform the winding because the wire is likely to be broken. If the diameter exceeds 0.12 mm, for example, in the drawing of FIG. And the length of the suction piece 3 in the arrangement direction is 10 mm to 20 m
It is difficult to wind as a winding constituting a small plunger of about m.

The present invention is also applicable to a structure in which the magnet 5 is not provided, and the suction piece 3 is attracted by the magnetic flux generated by the winding 4, and a terminal in which the terminal is mounted by insert molding without using the terminal mounting hole. Can also be applied.

[0021]

According to the present invention, the winding of the terminal on the outer surface of the other end of the cylindrical portion on the side where the end of the winding is pulled down from the upper surface of the bobbin and connected to the winding barb. Since the locking portion for hooking the winding end portion is provided at a position lower than the barb portion, even if the terminal is pushed down, tension is not applied to the winding end portion, and disconnection can be prevented.

[Brief description of the drawings]

FIG. 1A is a plan view showing an embodiment of a plunger of the present invention, and FIGS. 1B and 1C are E respectively in FIG. 1A.
It is the arrow view and the arrow F view.

FIG. 2 is a perspective view showing a main part of the embodiment.

FIG. 3 is a side view showing a main part of the present embodiment.

FIG. 4A is a side view for explaining a winding operation of the present embodiment, and FIG. 4B is an exploded plan view of the present embodiment.

FIG. 5A is a plan view showing a conventional example, and FIG. 5B is a side sectional view showing an example of a mounting structure thereof.

FIG. 6A is a perspective view showing a conventional terminal mounting structure,
(B) is a sectional view thereof.

[Explanation of symbols]

1: bobbin, 1a, 1b: cylinder, 1c, 1d: collar, 1
e, 1f: other end, 1h: mounting hole, 2: yoke, 2
a: mounting hole, 2b: base, 2c: leg, 3: suction piece,
3a: mounting hole, 3b: leg, 4: winding, 5: magnet,
6, 7: terminal, 6a, 7a: helmet, 7b: external circuit connection, 8, 15: solder, 10: fixture, 11: chassis, 12: board, 13: through hole, 14: soldering iron , 16: protrusion, 16a: locking portion

Claims (1)

[Claims] 1. A leg of a U-shaped yoke is inserted into a pair of cylindrical portions of a resin bobbin, a terminal is attached to an end of the bobbin on a yoke base side, and one end of the terminal is connected to the upper surface of the bobbin. A small plunger that protrudes and has an eaves portion to which the winding end is connected protruding from the outer surface of the bobbin, wherein the end of the winding on the bobbin is pulled down from the bobbin upper surface side and is lower than the elongation portion A small plunger characterized in that a locking portion for hanging a winding end is provided at a position.