JPH0726708Y2 - Crossed coil instrument - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross coil type instrument, and more particularly to a cross coil type instrument in which a circuit board and a coil are connected via a connecting wire.

2. Description of the Related Art Generally, a cross-coil type instrument is configured to generate a magnetic field corresponding to a supplied signal current by a coil and rotate a rotator having a pointer attached thereto by the generated magnetic field to perform an index. An example of a conventional crossed coil type instrument is shown in FIG.

The cross-coil type instrument includes a pointer shaft 18, a rotor magnet 19, an upper case 20, a lower case 21, coils 22, 23, a plurality of terminals / mounting posts 24, a magnetic shield case 25, and the like. Incidentally, 26 is a circuit board, and 27 is a screw 27 for fixing the circuit board 26 and the magnetic shield case 25, respectively.

As shown in the figure, in the conventional crossed coil type instrument, the magnetic shield case 25 has the upper case 20 and the lower case 21.
It was said to have a structure that greatly surrounded. Further, the plurality of terminal-mounting mounting posts 24 are arranged outside the magnetic shield case 25, and a connecting wire 28 that connects the circuit board 26 and the coils 22 and 23 is pierced through the inside thereof. 28 was soldered to the circuit board 26. Further, the connecting wire rods 28 are distributed and provided on the plurality of terminal-mounting mounting posts 24.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the conventional cross-coil type measuring instrument is a connecting member for connecting the end of the coil and a drive control circuit board on which a drive control circuit for supplying a signal for controlling the drive of the magnet to the coil is formed. Since the coil was distributed and provided on the plurality of legs of the coil bobbin around which the coil is wound, the connection member cannot be concentrated, resulting in inefficient connection and it is necessary to enlarge the drive control circuit board in accordance with the connection member. Further, since the end of the coil is extended directly from the coil to the connecting member, it is difficult to determine the route of the coil end, and there is a problem that the coil is disconnected during automatic assembly.

It is an object of the present invention to provide a cross-coil type instrument that can efficiently connect a coil and a drive control circuit board even if it is made in view of the above points.

Means for Solving the Problems The present invention provides a drive control circuit for supplying a plurality of end portions of a coil arranged around a rotatably arranged magnet and a signal for controlling the drive of the magnet to the coil. In a cross-coil type instrument in which the magnet and the coil are connected to each other via a plurality of connecting members disposed outside a magnetic shield case that magnetically shields the magnet and the coil from the outside. And has a convex portion provided between the plurality of connecting members and the coil and guiding a plurality of end portions of the coil, the plurality of end portions of the coil being wound around the convex portion. It is configured to guide the plurality of connecting members by making a detour along with.

Advantageous Effects of Invention According to the present invention, by providing a plurality of connecting members in close proximity to each other, the plurality of connecting members can be arranged in a concentrated manner, the coil and the drive control circuit can be easily connected, and the space can be reduced. A plurality of end portions of the coil that can be connected to the plurality of connecting members can be guided to the connecting member by rotating a convex portion provided between the plurality of connecting members and the coil. Can be distributed to multiple connecting members after being concentrated once around the convex portion, so that the wiring does not vary between the coil and the connecting member, and the wiring is shielded during assembly or the coil is wound. As it does not come into contact with the edge of the turn part and is not cut, it is possible to improve the assemblability. Also, even when the end treatment of the coil is automated, the wiring is directly pulled by the convex part. There is no such thing, and cutting is less likely to occur, and automation can be easily performed.

EXAMPLE Next, an example of the cross coil type instrument (hereinafter, simply referred to as instrument) according to the present invention will be described. FIG. 1 shows a plan view and a sectional view of an instrument according to an embodiment of the present invention.

The instrument is roughly composed of a coil bobbin 1, a rotor 2, coils 3, 4, coil connecting wires 5a to 5d, a magnetic shield case 6, and a drive control circuit board 7.

The coil bobbin 1 is composed of an upper case 1a and a lower case 1b which are resin-molded and form a pair. Each of the upper case 1a and the lower case 1b has a housing portion 7 for housing the rotor 2 and a coil winding portion 8 around which the coils 3 and 4 are wound.
a and 8b are formed. Further, the upper case 1a is integrally formed with a holding portion 9 that holds the coil connecting wire rods 5a to 5d.

The holding portion is formed with four through holes 10a to 10d penetrating vertically. The four through holes 10a to 10d are formed on the outer side of the holding portion 9 in a line at equal intervals, and a part of the four through holes 10a to 10d has a small diameter. Further, a convex portion 17 is integrally formed on the holding portion 9 near the through holes 10a to 10d.

A mounting recess is formed in the upper part of the lower case 1b,
By press-fitting the upper case 1a into the mounting recess, the upper case 1a and the lower case 1b are integrated to form the coil bobbin 1. A groove portion 12 is formed in the holding portion 9 in the vertical direction, and the magnetic shield case 6 is inserted and mounted in the groove portion 12 in the assembled state. A board mounting hole 13 is formed on the back surface of the lower case 1b.

The rotor 2 includes a pointer shaft 2a and a disk-shaped rotor magnet 2b fixed to the pointer shaft 2a. This rotor 2
Is rotatably housed in the space formed by the housing portion 7 when the coil bobbin 1 is assembled.

The coils 3 and 4 are wound around the coil turns 8a and 8b so as to intersect each other. Each end wire portion 3a, 3b, 4a, 4b of this coil 3, 4 is a convex portion
It is guided by 17 and is extended to the coil connecting wire rods 5a to 5d and is soldered to the vicinity of the upper end thereof.

The coil connecting wires 5a to 5d are press-fitted and attached to the through holes 10a to 10d formed in the holding portion 9. Further, in the mounted state, the coil connection wire rods 5a to 5d are configured to be substantially parallel to the rotation axis of the rotor 2.

The magnetic shield case 6 has a bottomed cylindrical shape made of a high-permeability metal, and is arranged at the lower part of the lower case 1b and has screws 15a, 16
It is fixed together with the circuit board 14 by b. The tubular portion of the magnetic shield case 6 in the attached state is located in the groove portion 12 described above. The magnetic shield case 6 is configured to surround a magnetic circuit formed by the rotor magnet 2b and the coils 3 and 4 provided in the rotor 2.
It has a function of magnetically shielding this magnetic circuit so as not to be affected by an external magnetic field.

Reference numeral 14 denotes a control drive circuit board on which a control drive circuit for controlling the current applied to the coils 3 and 4 is provided. On the control drive circuit board 14, a connector 16 for connecting the coil connecting wire rods 5a to 5d to the control drive circuit is mounted.
The circuit board is attached and fixed to the lower part of the coil bobbin by screwing screws 15a and 15b through mounting holes provided in the circuit board 14. A connector 16 is provided on the circuit board 14, and the lower ends of the coil connecting wire rods 5a to 5d extending downward from the holding portion 9 are connected to the connector 16.

As described above, in the present embodiment, the connecting wire rods 5a to 5d are arranged close to each other in a line and can be connected to the circuit board 14 by the connector 16, so that the connecting wire rods 5a to 5d and the circuit board 14 are connected.
And can be connected without performing work such as soldering.

Further, the convex portion 17 is provided in the vicinity of the connecting members 5a to 5d, and the coil
By arranging the terminals 3a, 3b, 4a, 4b of 3, 4 along the circumference of the convex portion 17 to guide the connecting wire rods 5a to 5b, the terminals 3a, 3b, 4a, 4b of the coils 3, 4 are formed. After gathering the routes of around the convex portion 17, it can be dispersed in each connecting wire 5a ~ 5d,
Since the variation in the end part of the shield case b of the 3 and 4 terminals 3a, 3b, 4a and 4b can be reduced, the terminals 3a, 3b, 4a and 4b of the coils 3 and 4 are shielded when the assembly is automated. 6 and the edge of the coil bobbin 1 do not come into contact with the edge of the coil bobbin 1 to be cut, and automation can be easily performed.

Effect of the Invention As described above, according to the present invention, by providing a plurality of connecting members close to each other, the plurality of connecting members can be arranged in a concentrated manner, and the coil and the drive control circuit can be easily connected. Along with the circumference of the convex portion provided between the plurality of connecting members and the coil, the plurality of end portions of the coil connected to the plurality of connecting members are detoured to the connecting member. By guiding, the plurality of end portions of the coil can be once concentrated around the convex portion and then distributed to the plurality of connecting members, so that the wiring does not greatly vary between the coil and the connecting member, Wiring does not come into contact with the shield case or the edge of the coil winding part during assembly and is not cut, which can improve the assemblability. Wiring is not pulled directly from the coil by the section, cutting is less likely to occur, and automation is easy.

[Brief description of drawings]

FIG. 1 is a sectional view and a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view and a plan view of a conventional example. 1 ... Coil bobbin, 2 ... Rotor, 3,4 ... Coil, 5a-5d
... coil connecting wire, 6 ... magnetic shield case, 9 ... holding part, 10a-10d ... through hole, 14 ... circuit board, 16 ... connector,
17 ... convex part.

Claims (1)

[Scope of utility model registration request] 1. A plurality of end portions of a coil, which is arranged around a magnet rotatably arranged, and a drive control circuit which supplies a signal for controlling the drive of the magnet to the coil, In a cross-coil type instrument connected via a plurality of connecting members arranged outside a magnetic shield case that magnetically shields the coil from the outside, the plurality of connecting members are arranged close to each other. Provided with a convex portion that is provided between the plurality of connecting members and the coil, and guides a plurality of end portions of the coil, and detours the plurality of end portions of the coil along the circumference of the convex portion. An intersecting coil type instrument configured to guide up to the plurality of connecting members.