JPH0635132Y2 - Cross coil type indicator - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a cross-coil type indicator instrument, and more particularly to a cross-coil type indicator instrument suitable for various instrument units such as automobile speedometers, tachometers and fuel gauges. .

[Conventional technology]

Conventionally, a magnet is connected to the other end of a rotary connecting shaft that rotates by connecting one end to a transmission, and by rotating this magnet at a rotation speed according to the vehicle speed, an electromagnetic induction force according to the rotation speed is generated. There is often used a speedometer unit having an electromagnetic induction type movement, which is generated between the guide cap and the guide cap and rotationally drives an indicating needle connected to the guide cap to display the vehicle speed.

However, there is a tendency to make the whole speedometer unit thinner due to recent demands such as expansion of the vehicle interior space, and in recent years, there are many speedometer units having smaller cross-coil movements.

FIG. 2 shows a conventional speedometer unit of this type, in which a speedometer unit 2 is housed in an instrument case 1 integrally molded of synthetic resin together with a lighting bulb (not shown), various warning lights, etc. Has been done, this speedometer unit 2
Has a cross-coil type movement 3.

The movement 3 has a coil bobbin 4, and two coils 5, 5 are wound around the coil bobbin 4 so as to be orthogonal to each other. A disk-shaped magnet rotor 6 having an S pole and an N pole is arranged inside each of the coils 5, and the magnet rotor 6 has a central portion in the axial direction of the coil boin 4. Rotating shaft 7
Is rotatably attached. Further, four terminal terminals 8a for energizing each coil 5 are formed at an interval of 90 ° on the outer peripheral portion of the coil bobbin 4, and a dial plate 14 and the like to be described later are mounted on the coil bobbin 4. Flange 9
Are formed so as to project in diametrically symmetrical positions. The magnet rotor 6 is freely rotatable around the rotating shaft 7 when the coils 5 are not energized, and the magnet rotor 6 is energized to the coils 5 through the terminal terminals 8a to thereby obtain a predetermined value. It is designed so that it can be rotated angularly.

In addition, one end of the rotating shaft 7 has the coil bobbin 4
A hairspring 10 fixed to the side is attached. With this hairspring 10, the rotating shaft 7 is returned to a predetermined 0 position in a state where the magnet rotor 6 can freely rotate without energizing each coil 5. It is designed to be urged.
Further, a movement case 11 that blocks the magnetic field is provided around the outer circumference of the coil bobbin 4.

The movement 3 configured as described above has an IC on the upper surface,
It is fixed to the upper surface of a hard printed wiring board (HPC) 12, which has electrical resistance connected to it and electrical wiring on the lower surface, with fixing screws 8 that also function as the terminal terminals 8a.
A dial 14 is disposed above the movement 3 through a light guide plate 13 that guides the illumination light of the illumination bulb to the dial. The dial 14 is screwed onto the flange 9 of the coil bobbin 4. It is fixed by a set screw 15 to be inserted. The tip of the rotary shaft 7 penetrates the dial 14, and the pointer 16 is attached to the tip of the rotary shaft 7.
Is attached to form the speedometer unit 2.

In the speedometer unit 2, when the measurement signal is input to the HPC 12, the HPC 12 performs a predetermined process, and a predetermined current corresponding to a predetermined measurement amount as a drive signal is applied to the terminal terminal 8a.
Is supplied to each coil 5 via. And each coil 5
The magnet rotor 6 rotates by an angle corresponding to the above-mentioned measured amount in the direction of the synthetic magnetic field of the magnetic fields generated by the coils 5 by the predetermined current supplied to the. As a result, the rotary shaft 7 rotates, and the pointer 16 rotates on the dial 14 to display the measured amount. At this time, the above hairspring 10
It is in a state in which it is caught by the rotation of the rotary shaft 7 and an urging force is accumulated. Then, when the automobile is stopped or the like, the magnet rotor 6 is allowed to rotate freely without energizing the coils 5, and the pointer 16 is attached to the rotary shaft 7 of the balance spring 10. It is rotated by the urging force to return to the 0 position.

[Problems to be solved by the device]

However, in the conventional speedometer unit 2 described above, the movement 3 is fixed to the upper surface of the HPC 12 and the dial 14 is arranged above the movement 3, so that the HPC 12 has the size h in the axial direction of the movement 3. Since the distance l between the dial 14 and the dial 14 is determined, and the axial size h of the movement 3 cannot be further reduced as long as it is a cross-coil movement, the speedometer unit 2 should be made thinner. That is, the above HPC12 and dial 1
There is a problem in that it is difficult to reduce the distance l with 4.

The present invention has been made in view of the above points, and provides a cross-coil type indicating instrument capable of reducing the distance between a wiring board fixed by a movement and a fixed dial and a dial, and making the entire instrument unit thin. The purpose is to do.

[Means for Solving the Problems]

In order to achieve the above object, a cross coil type indicator according to the present invention has two coils wound in a direction orthogonal to each other on a coil bobbin in which a magnet rotor is rotatably housed via a rotary shaft. A coil bobbin is housed in a magnetic shielding case to form a movement, and this movement is arranged on a wiring board that energizes each coil, and a dial is arranged above the moven and penetrates the dial. In a cross-coil type indicator having an indicator needle attached to the tip of the rotating shaft, a part of the coil bobbin is extended to the outside of the magnetic shielding case body and an extension part is formed on the wiring board. The movement is fitted and the lower end of the movement forms an opening projecting below the wiring board, and the extension is provided around the opening with respect to the wiring board. Mounting and it is characterized by comprising fixed.

[Action]

According to the present invention, a part of the coil bobbin is extended to the outside of the case for shielding, and the extension is formed around the opening formed by fitting the movement formed in the wiring board to the wiring board. Since it is attached and fixed, the distance between the wiring board and the dial can be reduced without reducing the axial size of the movement itself, and the lower end of the movement protruding below the wiring board Below the lower end surface, there is no means for fixing the movement to the wiring board, and the dimension protruding from the lower surface of the wiring board can be made smaller, thereby making the entire instrument unit axially thinner. Is something that can be done.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The same parts as those in the conventional art are designated by the same reference numerals.

FIG. 1 shows an embodiment of the present invention. Two coils 5, 5 are wound around a coil bobbin 17 so as to be orthogonal to each other, and inside the coil bobbin 17, an S pole and A disk-shaped magnet rotor 6 having N poles formed at diametrically symmetrical positions is arranged, and a rotary shaft 7 extending in the axial direction of the coil bobbin 17 is attached to the center of the magnet rotor 6. There is. The magnet rotor 6 is freely rotatable about the rotary shaft 7 in a state where the coils 5 are not energized,
Terminal mounting portion 1 as an extension portion of the coil bobbin formed by extending the diametrically symmetrical position of the outer peripheral portion of the coil bobbin 17.
By energizing each coil 5 through the pin terminals 19 and 19 provided upright on the coils 8 and 18, the coil 5 can be rotated by a predetermined angle. In addition, the above-mentioned rotating shaft 7 has a mustache spring 10
Is attached, and the urging force of the balance spring 10 causes the pointer 16 attached to the tip of the rotary shaft 7 to return to the 0 position.

Further, below the outer peripheral portion of the coil bobbin 17, a step portion 17a is formed so that the diameter of the lower portion of the coil bobbin 17 is reduced, and further, at a portion of the step portion 17a corresponding to the pin terminal 19, Guide grooves 20, 20 having an arcuate cross section are formed so as to extend upward from the lower end surface of the step portion 17a.
Furthermore, the outer circumference of the coil bobbin 17 is made of a ferromagnetic material and follows the shape of the coil bobbin 17 to form a case body 21.
A cylindrical magnetic shielding case body 21 having a stepped portion 21a is provided around the lower part of the magnetic shielding case body 21. A part of the magnetic shielding case body 21 is inserted into the guide groove 20. ing. Further, four posts for winding the coils 5 at right angles are formed at 90 ° intervals above the outer peripheral portion of the coil bobbin 17, and one of the posts is opposed to the other. Posts 22a, 22b are formed to be higher than the other pair of posts (not shown), and the upper ends of the pair of posts 22a, 22b have a light guide plate 1 as will be described later.
It is designed to fit with 3. The cross-coil type movement 23 is formed by the above configuration.

An opening 24 is formed in the HPC 12 to which the movement 23 configured as described above is attached and fixed, and the movement is formed in the opening 24 so that the diameter of the lower portion is small. The lower end of the movement 23 is fitted so that the lower end of the movement 23 projects from the lower surface of the HPC 12, and the step 21a of the lower portion of the magnetic shielding case body 21 is formed.
Is engaged with the peripheral edge of the opening 24 and the movement 23
It is supposed to be placed on C12. The movement 23 is a fixing screw 25 which is screwed through the HPC 12 into the lower surface of the terminal mounting portion 18 as an extension of the coil bobbin 17 extending outside the magnetic shielding case body 21.
It is fixed at. Further, of the posts 22a, 22b of the coil bobbin 17, the positioning pin 26 formed at the tip of one of the posts 22a is a positioning hole formed in the light guide plate 13.
The coil bobbin 17 is fitted into the coil bobbin 17 by fitting the same into the positioning groove 29 formed by a pair of projecting pieces 28 provided on the lower surface of the light guide plate 13 while being fitted into the post 23b.
The light guide plate 13 is positioned and placed on the top. A dial 14 is fixed to the upper surface of the light guide plate 13 with a set screw (not shown).

In this embodiment, a measurement signal indicating the vehicle speed is input to the HPC 12, a predetermined process is performed in the HPC 12, and a predetermined current as a drive signal is supplied to each coil 5 via the pin terminal 19. The magnet rotor 6 is rotated by an angle corresponding to the measured amount according to the combined magnetic field of the magnetic fields generated by the coils 5, whereby the rotary shaft 7 is rotated and the indicator needle 16 attached to the tip of the rotary shaft 7 is moved. It is rotated on the dial 14 to display the measured amount. At this time, the hairspring 10 is gradually rolled up as the rotary shaft 7 rotates, and the urging force is accumulated. When the coils 5 are not energized, such as when the vehicle is stopped, the urging force of the balance spring 10 causes the indicator needle 16 to rotate and return to the 0 position.

Therefore, in the present embodiment, the lower end of the movement 23 is fitted into the opening 24 of the HPC 12, and a part of the coil bobbin 17 is extended to the outside of the magnetic shielding case body 21 to attach a terminal as an extension. HPC 1 around part 24 around opening 24
Since it is mounted and fixed to the 2 through the fixing screw 25, the size h of the movement 23 in the axial direction remains the same as before, and the size h of the movement of the HPC 12 and the movement 23 is not increased. It is possible to make the distance l'with respect to the dial 14 arranged in the space smaller than the conventional distance l. Further, below the lower end surface of the lower end portion of the movement 23 projecting downward of the HPC 12, there is no means for fixing the movement 23 to the HPC 12, so that the dimension projecting from the lower surface of the HPC 12 can be reduced. Therefore, the entire instrument unit can be thinned, and the effective use space in the vehicle compartment can be further expanded. Further, since the mounting and fixing of the movement 23 to the HPC 12 are performed by the fixing screw 25 located on the outer side portion of the movement 23, a fixing screw formed of a magnetic material can also be used.

[Effect of device]

As described above, in the cross coil type indicator according to the present invention, the movement formed on the wiring board is fitted to the extension formed by extending a part of the coil bobbin to the outside of the magnetic shielding case body. Since it is attached and fixed to the wiring board around the opening, the distance between the wiring board and the dial can be reduced, and the lower end surface of the lower end portion of the movement protruding below the wiring board In the lower part, there is no means for fixing the movement to the wiring board, and the dimension protruding from the lower surface of the wiring board can be reduced, which makes it possible to reduce the thickness of the entire instrument unit. Play.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a main part of a cross-coil type indicating instrument according to the present invention, and FIG. 2 is a vertical cross-sectional view showing a conventional indicating instrument. 5 ... Coil, 6 ... Magnet rotor, 7 ... Rotating shaft, 12 ...
Wiring board (HPC), 14 ... dial, 16 ... pointer, 17 ... coil bobbin, 21 ... magnetic shielding case body, 17a, 21a ... step, 25 ... fixing screw.

Claims (1)

[Scope of utility model registration request] 1. A movement is provided by winding two coils in a direction orthogonal to a coil bobbin in which a magnet rotor is rotatably housed via a rotary shaft and housing the coil bobbin in a magnetic shielding case body. This movement is arranged on a wiring board that energizes each coil, a dial is arranged above the moven, and a pointer is attached to the tip of the rotary shaft that penetrates the dial. In a cross-coil type indicating instrument, a part of the coil bobbin forms an extension part that extends outside the magnetic shielding case body, and the movement fits on the wiring board, and the lower end of the movement is the wiring board. A cross coil having an opening projecting downwardly of the wire, and the extension being attached and fixed to the wiring board around the opening. Shape indicating instrument.