JPH081502Y2 - Cross coil type instrument - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-coil type instrument, and more particularly, it has a cross-coil composed of coils intersecting with each other and a magnet rotor, and by rotating the magnet rotor by a magnetic field generated by the cross-coil. The present invention relates to a cross-coil type instrument that is preferably applied to various gauges such as a water temperature gauge and a fuel gauge for vehicles that display a predetermined measurement amount from the rotation angle.

[0002]

2. Description of the Related Art Conventionally, as this type of instrument, the instrument having the structure shown in FIG. 6 is generally known. In the figure, reference numeral 1 denotes a coil bobbin formed by abutting upper and lower divided portions 1a and 1b, and coils forming a cross coil 2 are wound around each other around the coil bobbin 1. . A space 1c is formed in the center of the coil bobbin 1 by abutting the portions 1a and 1b, and the magnet rotor 3 magnetized to the NS2 pole is housed in the space 1c.

The magnet rotor 2 is rotatably disposed in the space 1c by rotatably supporting both ends of a pointer shaft 4 which is inserted and fixed in the center of the magnet rotor 2 to the portions 1a and 1b of the coil bobbin 1. ing. Coil bobbin 1
One end of the pointer shaft 4 supported on the portion 1a side is projected from the coil bobbin 1, and the pointer 5 is fixed to the tip thereof.

The coil bobbin 1 is also integrally formed with four terminal support portions 1e having terminal press-fitting holes 1d, and each terminal support portion 1e is a terminal press-fitted into the terminal press-fitting hole 1d (6a and 6b in the figure). Only two are shown). The coil ends of the cross coil 2 wound around the coil bobbin 1 are connected to the upper ends of the terminals 6a and 6b, and the external circuits formed on the printed wiring board 9 described later are connected to the lower ends thereof. The entire coil bobbin 1 around which the cross coil 2 is wound is housed in a metal case 7 for magnetic shielding.

The coil bobbin 1, the cross coil 2, the magnet rotor 3, the pointer shaft 4, the terminals 6a and 6b, and the metal case 7 constitute an instrument movement. This instrument movement is an electronic component 8 for constituting an external circuit.
Mounted on a printed wiring board 9 having
The screw 10 that is in electrical contact with the printed wiring of the printed wiring board 9 is screwed into the screw holes formed in the lower ends of the terminals 6a and 6b to be integrated with the printed wiring board 9 and the lower ends of the terminals 6a and 6b. Connected to an external circuit.

A support terminal (only one of which is shown in FIG. 11) is attached to the printed wiring board 9 so as to be electrically connected to a specific printed wiring on the printed wiring board 9. A screw hole is formed in the support terminal 11, and a screw 13 inserted from the back side of the case 12 is screwed into the screw hole so that the instrument movement can pass through the printed wiring board 9 and project at the bottom of the case 12. 1
It is fixed at the portion 2a.

The case 12 is a case of a combination meter that accommodates the cross-coil type instrument according to the present invention together with other instruments, and a flexible wiring board (FPC) 14 is arranged on the back side thereof. Therefore, FPC14
By electrically contacting the screw 13 with a specific printed wiring of the FPC 1 and the circuit on the printed wiring board 9.
The circuit on 4 is electrically connected via the support terminal 11 and the screw 13.

The instrument movement is integrated with the dial 15 by fixing the dial 15 to a mounting piece 1f formed integrally with the coil bobbin 1.

In the cross-coil type instrument having the above-mentioned structure, when a current corresponding to the amount of measurement is passed through the cross-coil 2, the cross-coil 2 generates magnetic fields orthogonal to each other. The magnet rotor rotates together with the pointer shaft so that the magnetic pole direction of the magnet rotor matches the direction of the composite magnetic field that combines these orthogonal magnetic fields, and the pointer fixed to the pointer shaft adjusts the scale on the dial according to the measured amount. Indicating the measured quantity.

The above-mentioned cross-coil type instrument has various circuit configurations depending on its indicating characteristic, and an example of an equivalent circuit is shown in FIG. When constructing the cross-coil type instrument of the equivalent circuit shown in the figure, one ends of the coils L ₁₁ and L ₁₂ and the coil L ₂ wound around the coil bobbin 1 constituting the cross coil 2 so as to cross each other are on the coil bobbin 1. Interconnected using one terminal.

The other end of the coil L ₁₁ is connected to the + power source through another terminal on the coil bobbin 1, the resistor R 1 on the printed wiring board 9, the support terminal 11 and the printed wiring of the FPC 13, The other end of L ₁₂ is connected to the ground via another terminal on the coil bobbin 1, the printed wiring on the printed wiring board 9, the support terminal 11 and the printed wiring of the FPC 13, and the other end of the coil L ₂ is Zener diode D1 and resistor R2 on the printed wiring board 9, the support terminal 11 and the printed wiring of the FPC 13 are connected to the + power source, and the Zener diode on the printed wiring board 9 is provided. The interconnection point of D1 and resistor R2 is the support terminal 1
1. It must be connected to ground via the printed wiring of the FPC 13 and the sensor resistor R _S.

[0012]

As described above, in the conventional cross-coil type instrument, the printed wiring board 9 on which the electronic components constituting the external circuit are mounted is used to connect the instrument movement to the external circuit. However, since there are more than a dozen types of external circuits, it is necessary to prepare various types of printed wiring boards, which leads to increased costs due to a small number of various components, and troublesome component management. There were many problems.

Therefore, in view of the above-mentioned conventional problems, the present invention enables connection with an external circuit without using a printed wiring board, thereby reducing costs and facilitating component management. It is an object of the present invention to provide a cross coil type measuring instrument.

[0014]

In order to solve the above problems, a cross coil type instrument according to the present invention has a coil bobbin in which coils constituting a cross coil are wound around each other around a coil bobbin divided into upper and lower parts. A magnet rotor magnetized to have NS2 poles is rotatably arranged in the space of the center of the coil, and a terminal for connecting a coil end or the like is provided around the coil bobbin, and a current according to a measurement amount is applied to the cross coil. In the cross-coil type instrument in which the magnet rotor is rotated in the direction of the synthetic magnetic field generated at the time to indicate the measurement amount, the terminals are constituted by terminals respectively inserted from above and below the coil bobbin, Electronic components are selectively interconnected from the terminals inserted from above and below, and electronic components are provided between component connection pieces selectively formed at the projecting ends of the terminals. It is characterized by being configured the external circuit connected.

[0015]

In the above construction, the terminals for connecting the coil ends and the like are constituted by the terminals inserted from above and below the coil bobbin, and the terminals inserted from above and below are selectively interconnected and the terminals are projected. Since the external circuit is configured by connecting the electronic components between the component connecting pieces selectively formed at the ends, it is not necessary to provide a printed wiring board for configuring the external circuit.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing an embodiment of a cross-coil type instrument according to the present invention, FIG. 2 is a top view, and FIG. 3 is AA in FIG.
FIG. 6 is a cross-sectional view taken along the line of FIG.
The same reference numerals are given to the same parts as the above-mentioned conventional ones, and detailed description thereof will be omitted.

In the cross-coil type instrument of the illustrated embodiment, the structure of the terminal support portion integrally provided with the coil bobbin 1 at the outer peripheral portion thereof at equal intervals of 90 degrees and the terminal supported by this terminal support portion are different. Other than the coil bobbin 1, the cross coil 2, the magnet rotor 3, the pointer shaft 4, the metal case 7,
Although it is slightly different in details, it is substantially the same as that of FIG.

A portion 1 divided into upper and lower parts of the coil bobbin 1.
Four terminal supporting portions 21a to 21d are integrally formed on one of 1a and 1b at equal intervals of 90 degrees, and the other 1b.
On the other hand, the four terminal support parts 2
Four terminal support portions (only two of 22a and 22c are shown in the figure) are integrally formed at positions corresponding to 1a to 21d.

A terminal holding hole 211 is formed in each of the terminal supporting portions 21a to 21d, and a terminal engaging step portion 212 is formed in the terminal holding hole 211. In addition, the terminal supporting portions 21a to 21d have a structure shown in FIG.
As shown in A and B, terminal relief holes 213 extending from below are formed so as to be orthogonal to the terminal holding holes 211.

A plate-like terminal 23 having a forked portion 231 formed at the front end and a coil winding portion 232 formed at the rear end is inserted into each of the terminal holding holes 211 from above. In the plate-shaped terminal 23 inserted into the terminal holding hole 211, the engaging portion 233 formed at the tip thereof has the terminal holding hole 211.
It is engaged with the inner engaging step portion 212 and held by the terminal supporting portions 21a to 21d, respectively.

Further, terminal holding holes 221 are formed in the terminal support portions 22a and 22c, respectively, and a terminal engaging step portion 222 is formed in the terminal holding holes 221. The plate-shaped terminal 24 is inserted into the terminal holding hole 221 from below. The plate-shaped terminal 24 inserted into the terminal holding hole 221 has the engaging tongue piece 241 formed by being cut and raised in the middle thereof to be engaged with the terminal engaging step portion 222 in the terminal holding hole 221. It is held by the supporting portions 22a and 22c, respectively.

The terminal holding hole 211 of the terminal supporting portion 21a.
A tongue-shaped component connecting piece 234 is integrally formed on the terminal 23 inserted and retained in the terminal 23 adjacent to the coil winding portion 232. Further, the terminal 24 inserted and held in the terminal holding hole 221 of the terminal supporting portion 22a corresponding to the terminal supporting portion 21a has its protruding end bent in an L shape, and the bent portion 242 has the above-mentioned structure. A tongue-shaped component connection piece 243 for connecting an electronic component to the component connection piece 234 and a bifurcated component connection piece 244 for connecting an electronic component to another terminal 24 are formed. . Then, the tongue-shaped component connecting piece 234 of the terminal 23 and the tongue-shaped component connecting piece 24 of the terminal 24
An electronic component 25 is connected between the two by soldering a lead wire 251 or the like.

The bent portion 242 of the terminal 24, which is inserted and held in the terminal holding hole 221 of the terminal supporting portion (not shown) corresponding to the terminal supporting portion 21b, has an electronic space between the terminal 24 and another terminal 24. Two forked component connecting pieces 2 for connecting components
45 and 246 are formed.

Further, the bent portion 242 of the terminal 24, which is inserted and held in the terminal holding hole 221 of the terminal supporting portion 22c corresponding to the terminal supporting portion 21c, has an electronic component between the terminal 24 and another terminal 24. Two forked connection pieces 2 for connecting
47 and 248 are formed. Then, a lead wire 261 is soldered between the forked component connecting pieces 246 and 247 of the adjacent terminals 24 to make the electronic component 2
6 is connected.

The bent piece 242 of the terminal 24 is also formed with a tap screw hole 249.
The screw 13 that is electrically contacted with the printed wiring of the FPC 14
By screwing, the entire instrument movement is fixed to the bottom of the case 12, and electrical connection with the printed wiring of the FPC 14 is made.

The terminal 2 is inserted into the terminal holding hole 221 of the terminal supporting portion (not shown) corresponding to the terminal supporting portion 21d.
4 is not inserted.

The terminal 2 corresponding to the terminal support portion 21c
In the case of No. 4, the insertion end is extended so as to reach between the forked portions 213 of the terminal 23, and this extended portion 24a is inserted into the terminal escape hole 231 and fitted between the forked portions 231. The projection of the bifurcated portion 231 is engaged with the dowel hole to electrically connect the terminals 23 and 24. However, in the case of the terminal 24 corresponding to the terminal support portion 21a, the insertion end of the terminal 23 is the terminal 23. There is no extension 24a that reaches between the forked portions 231, and no electrical connection is made between the terminals 23 and 24.

In the above-described embodiment, the tongue-shaped component connecting piece is formed on the specific terminal 23, and the tongue-shaped component connecting piece and the bifurcated component connecting piece are formed on the specific terminal 24. Depending on whether electronic components are connected between
A tongue-shaped component connecting piece or a bifurcated component connecting piece can be provided in any combination in any terminal.

An equivalent circuit of the cross coil type instrument including an external circuit is shown in FIGS. 5A and 5B. The positions of the terminals 23 and 24 are also shown in these figures.

As is clear from the embodiment described above,
Since the terminals held by the respective terminal supporting portions of the coil bobbin are constituted by two terminals which are inserted and held from the upper and lower sides and are selectively interconnected, the lead wires of the electronic component are connected to the respective terminals. It becomes possible to form a connection piece for performing the above, and by using this connection piece, it becomes possible to form an arbitrary external circuit without using a printed wiring board.

[0031]

As described above, according to the present invention, the terminals respectively inserted from the vertical direction of the coil bobbin are selectively interconnected, and between the component connecting pieces selectively formed at the projecting ends of the terminals. Since the electronic circuit is connected to form the external circuit, there is no printed wiring board for forming the external circuit, and it is possible to connect to the external circuit without using the printed wiring board. The cost can be reduced and the parts can be easily managed.

[Brief description of drawings]

FIG. 1 is a side view of a cross coil type instrument according to the present invention.

FIG. 2 is a top view of the cross-coil type meter of FIG.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a diagram showing details of a terminal holding hole.

FIG. 5 is a diagram showing an equivalent circuit example of a cross-coil type instrument according to the present invention.

FIG. 6 is a partially cutaway side view showing an example of a conventional cross coil type instrument.

FIG. 7 is a diagram showing an example of an equivalent circuit of a cross coil type instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil bobbin 1a, 1b Part 1c Space 2 Cross coil 3 Magnet rotor 23,24 Terminal 234,243-248 Component connection piece 25,26 Electronic component

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin which is divided into upper and lower parts is wound around a coil bobbin so as to intersect each other, and a magnet rotor magnetized to an NS2 pole is rotatably arranged in a space of a central portion of the coil bobbin. And a terminal for connecting a coil end or the like is provided around the coil bobbin,
In a cross-coil type instrument in which the magnet rotor is rotated in the direction of a synthetic magnetic field generated when a current according to a measurement amount is applied to the cross coil to indicate the measurement amount, the terminals are arranged above and below the coil bobbin. External circuit by connecting the electronic components between the component connecting pieces selectively formed at the protruding ends of the terminals, and connecting the terminals inserted from above and below, respectively. A cross-coil type instrument characterized in that