JPH0632576Y2 - 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 vehicle-mounted instruments such as automobile speedometers, tachometers and fuel gauges. .

[Conventional technology]

Conventionally, a current that changes according to the measurement amount is applied to a pair of coils that generate mutually orthogonal magnetic fields, and the magnet rotor is rotated in the direction of the combined magnetic field that combines the magnetic fields generated by the pair of coils. In-vehicle indicating instruments that display a measured amount by a pointer that rotates together with a magnet rotor are often used.

FIG. 2 shows a conventional indicating instrument of this kind. This indicating instrument 1 has various measuring instrument units 2 such as a speedometer, a tachometer, and a fuel gauge. This measuring instrument unit 2 is for measuring instruments. It has a movement 3.

The instrument movement 3 has a coil bobbin 4, and two coils 5 and 5 are wound around the coil bobbin 4 so as to be orthogonal to each other. Each coil 5 above
A disk-shaped magnet rotor 6 having an S pole and an N pole is disposed inside the rotor, and a rotating shaft 7 extending in the axial direction of the coil bobbin 4 is provided at the center of the magnet rotor 6. It is rotatably attached.

In addition, a terminal terminal 8a for energizing each coil 5 is formed on the outer periphery of the coil bobbin 4, and flanges 9a, 9b for attaching the movement 3 to a light guide plate 14 described later are diametrically symmetrical. The protrusion is formed at the position. Then, the magnet rotor 6
Is rotatable about the rotary shaft 7 when the coils 5 are not energized, and can be rotated by a predetermined angle by energizing the coils 5.

In addition, one end of the rotating shaft 7 has the coil bobbin 4
The balance spring 10 connected to the side is fixed, and the balance spring 10 allows the rotating shaft 7 to return to a predetermined 0 position in a state where the magnet rotor 6 can freely rotate without energizing the coil 5. It is designed to be urged to. Further, a movement case 11 that blocks a magnetic field is provided around the outer circumference of the coil bobbin 4.

The movement 3 configured as described above has an I
C, a resistor, etc. are connected, and fixed to the upper surface of the hard printed wiring board 12 on the lower surface of which electrical wiring, soldering portions, etc. are arranged, by a fixing screw 8 which also functions as the terminal terminal 8a, and On the upper surface of the movement 3, a light guide plate 14 functioning as a prism is formed on the flanges 9a and 9b of the coil bobbin 4 so as to guide the light emitted from the dial plate 13 and a lighting bulb (not shown) to the dial plate 13 and a pointer 17 described later. It is fixed by a set screw 16 that is screwed into the formed screw hole 15. Also, the rotating shaft 7
The front end of the light guide plate 14 penetrates the dial 13 and the light guide plate 14 with the movement 3 attached to the back side of the light guide plate 14, and the pointer 17 is fixed to the front end of the instrument. The unit 2 is formed.

In the above-mentioned conventional indicating instrument, predetermined measurement signals such as vehicle speed and remaining fuel amount are input to the hard printed wiring board 12 via a wire harness or the like (not shown), and predetermined processing is performed by the hard printed wiring board 12. . Then, a predetermined current as a drive signal is supplied from the hard printed wiring board 12 to each of the coils 5 via a fixing screw 8 having a function as a terminal, and a corresponding magnetic field generated by the coils 5 is generated. The magnet rotor 6 rotates by an angle corresponding to the measured amount. As a result, the rotary shaft 7 rotates, and the pointer 17 moves to the dial plate 13.
It is designed to rotate up and display the measured amount.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional indicating instrument, a set screw 16 penetrating through the fool holes 18 and 19 of the dial plate 13 and the light guide plate 14 is provided with a pair of flanges projecting from the coil bobbin 4. 9
Since the instrument movement 3 is attached to the back surface side of the light guide plate 14 by being screwed into the screw holes 15 of a and 9b, only the play amount between the fool hole 19 and the set screw 16 is provided. The positional relationship between the light guide plate 14 and the movement 3 may shift, and if the attachment position of the movement 3 is incorrect, the pointer 1 fixed to the tip of the rotary shaft 7
7 and the light guide plate 14 come into contact with each other, and the pointer 17 does not move. Further, the dial plate 13 and the light guide plate 1 are provided on the pair of flanges 9a and 9b of the coil bobbin 4, respectively.
Since the set screw 16 penetrating 4 is screwed in to attach the movement 3, it is necessary to carry out the screw fixing operation many times, which leads to an increase in the number of parts, which makes the manufacturing difficult and the manufacturing cost increases. It also has the problem.

The present invention has been made in view of the above points, and it is possible to ensure the positioning of the instrument movement and ensure a smooth drive of the pointer, reduce the number of parts, and be inexpensive and easy to assemble. An object is to provide a coil type indicating instrument.

[Means for Solving the Problems]

In order to achieve the above object, a cross coil type indicator according to the present invention forms a cross coil by winding two coils on a coil bobbin in a direction orthogonal to each other, and a magnet rotor having a rotating shaft inside the cross coil. A movement is constructed by rotatably arranging as a center, and a pointer for indicating a predetermined measurement amount in cooperation with the dial is attached to the tip of the rotary shaft, and the dial is attached to the back of the dial together with the dial. In a cross-coil type indicator instrument in which a light guide plate for illuminating a pointer is arranged, and the movement is attached to the light guide plate through a pair of flanges formed on the coil bobbin, the one flange is held on the light guide plate. Is formed, and the one flange is fixed to the engaging portion.

[Action]

According to the present invention, the engaging portion for holding one of the pair of flanges formed on the coil bobbin is formed on the light guide plate, and the one flange is fixed to the engaging portion. The position of the instrument movement can be securely positioned to prevent contact between the light guide plate and the pointer, and by fixing one flange to the engaging part, the conventional screwing process can be partially omitted. It is possible.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1, and the same parts as those in the prior art will be designated by the same reference numerals.

FIG. 1 shows an embodiment of a light guide plate used in a cross-coil type indicator according to the present invention. On the back side of the light guide plate 14, the light emitted from an illumination bulb (not shown) is guided.
Light entrance piece 20 having light entrance surface 20a for taking in
Is projected, and the coil 5 and 5 are provided near the light entrance piece 20.
A cross coil type instrument movement 3 having a coil bobbin 4 wound in such a manner that 5 are orthogonal to each other is attached.

The rotary shaft 7 of the movement 3 attached to the light guide plate 14 is inserted into the light guide plate 14, and a pointer 17 is attached to the tip thereof.
A notch 21 for fixing the movement 3 is formed on both sides of the notch 21 on one side thereof.
A pair of flanges 9a and 9b protruding from the coil bobbin 4.
The engaging portion 22 that holds one of the flanges 9a is formed, and the threaded portion 23 to which the other flange 9b is attached is formed on the other side.

The engaging portion 22 is positioned between the locking pieces 24, 24, which are provided to project from the light-receiving piece 20 and have a substantially L-shaped cross section, and which are opposed to each other. The flange 9a includes a positioning piece 26 having a navel portion 25 that engages with the screw hole 15 of the flange 9a. An opening 27 formed by the locking pieces 24, 24 and the positioning piece 26 has the flange 9a. Is inserted and held from the side of the notch 21.

Further, a pair of guide ribs 28, 28 and a supporting rib 29 located therebetween are formed between the engaging portion 22 and the notch 21, and the one flange 9a is provided with the guide ribs 28, 28. By inserting the flange 9a into the engaging portion 22 so that the upper surface of the flange 9a contacts the supporting rib 29, the mounting and positioning of the flange 9a can be performed very easily.

The threaded portion 23 is composed of a pair of guide ribs 30 and 30 for positioning the other flange 9b and a screw hole 31 formed between them, and the one flange 9a is engaged with the engaging rib 23a. The other flange 9b is positioned inside the guide ribs 30, 30 while being held in the joint portion 22, and the set screw 16 is screwed into the flange 9b from the surface side of the light guide plate 14 through the screw hole 31. It is designed to be entered.

In the case of the present embodiment, the dial arranged on the back surface side of the light guide plate 14 is positioned by engagement with the protrusion (not shown) formed on the front surface of the light guide plate 14, It is fixed to the light guide plate 14 by a set screw (not shown).

Therefore, in this embodiment, the light guide plate 14 is provided with the engaging portion 22 for holding the one flange 9a of the coil bobbin 4, and the one flange 9a is inserted and held and fixed in the engaging portion 22. At the same time, since the other flange 9b is fixed to the threaded portion 23 of the light guide plate 14 with the set screw 16, the positioning when attaching the instrument movement 3 to the back surface side of the light guide plate 14 is extremely easy and reliable. The movement of the movement 3 is attached to the regular position to prevent contact between the light guide plate 14 and the pointer 17 and
It is possible to ensure smooth driving of No. 7.

In addition, one flange 9 a of the coil bobbin 4 is attached to the light guide plate 1.
4 is held and fixed in the engaging portion 22 formed integrally with 4, and only the other flange 9b is fixed with the set screw 16. Therefore, only one screwing point is required, and the conventional screwing point is two. It is possible to reduce the number of parts as compared with the one at a place, and it is possible to make it inexpensive and excellent in assembling.

[Effect of device]

As described above, in the cross-coil type indicator according to the present invention, the light guide plate is formed with the engaging portion that holds one of the pair of flanges formed on the coil bobbin, and the one flange is formed on the engaging portion. Since I fixed it,
When mounting the instrument movement on the light guide plate, the positioning can be ensured to prevent contact between the light guide plate and the pointer to ensure smooth drive of the pointer, and one flange can be fixed to the engaging part. As a result, the conventional screwing step can be partially omitted, and the number of parts can be reduced, and the cost can be reduced and the assemblability can be excellent.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a cross-coil type indicating instrument according to the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional indicating instrument. 3 ... Movement for instrument, 4 ... Coil bobbin, 5 ...
... Coil, 7 ... Rotating shaft, 9a, 9b ... Flange, 1
3 ... Character plate, 14 ... Light guide plate, 16 ... Set screw, 1
7 ... pointer, 21 ... notch, 22 ... engaging part, 23 ...
… Screwed part, 24 …… Locking piece, 26 …… Positioning piece.

Claims (1)

[Scope of utility model registration request] 1. A cross bobbin is formed by winding two coils around a coil bobbin in a direction orthogonal to each other, and a magnet rotor is rotatably arranged around a rotary shaft inside the cross coil to form a movement. , A pointer for attaching a predetermined amount of measurement is attached to the tip of the rotary shaft in cooperation with the dial, and a light guide plate for illuminating the pointer together with the dial is arranged on the back surface of the dial. In a cross-coil type indicating instrument in which the movement is attached to a light plate via a pair of flanges formed on the coil bobbin, an engaging portion for holding the one flange is formed on the light guide plate, and the engaging portion is formed on the engaging portion. A cross coil type indicating instrument characterized in that one of the above flanges is fixed.