JPH10288631A - Indicating instatement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indicating instrument having a casing for storing a driving unit fittable to or removable from a circuit board easily. SOLUTION: Each raised tab part 22 of the bottom wall 21 of a shield casing 20 is inserted into each corresponding opening 31 of a circuit board 30 respectively. At this time, each raised tab part 22 is kept at a state of projecting from each corresponding opening 31 at its tip part 22a. After that, the shield casing 20 is rotated along the circuit board 30, and the rising part of each raised tab part 22 is brought into contact with the internal end 31a of each corresponding opening 31. Accompanied with this, a part close to each internal end 31a of the circuit board 30 is interposed and held between the bottom wall 21 and each raised tab part 22 at its tip part 22a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an indicating instrument such as a cross-coil indicating instrument.

[0002]

2. Description of the Related Art Conventionally, for example, in a cross coil type indicating instrument, a pointer shaft is coaxially and rotatably supported in a bobbin, and both cross coils are wound around an outer peripheral wall of the bobbin.
In some cases, the bobbin is accommodated in a shield casing at a lower portion thereof, and the shield casing is attached to a circuit board.

[0003]

By the way, the above-mentioned cross-coil type indicator is attached to the circuit board by fastening the boss portion of the bobbin to the circuit board with a screw or by cutting and raising the bottom formed on the bottom wall of the shield casing. This was done by swaging the part on a circuit board. However, in such a mounting structure, it is necessary to loosen the screw or to forcibly raise the cut-and-raised portion from the circuit board during maintenance and inspection of the indicating instrument. Therefore, there is a problem that maintenance and inspection of the indicating instrument is troublesome.

In view of the above, the present invention has been made to provide an indicating instrument in which a casing accommodating a drive unit can be easily attached to or detached from a circuit board. Aim.

[0005]

According to the first aspect of the present invention, at least two cut-and-raised portions are provided on a bottom wall of a casing accommodating a driving portion. Are cut and raised in an L-shape outward along the circumferential direction. In the circuit board, openings are formed at positions corresponding to the respective cut-and-raised portions.

The bottom wall of the casing is attached to the circuit board by rotating at least one of the circuit board and the casing in a state in which each cut-and-raised portion is inserted into each of the openings. This is achieved by sandwiching the inner end of each opening between the tip and the bottom wall. According to this, when attaching the casing to the circuit board, the cut-and-raised portions are inserted into the respective openings of the circuit board so that the bottom wall of the casing is aligned with the circuit board. At this time, each of the cut-and-raised portions is held in a state of protruding from each of the openings at its tip. afterwards,
When at least one of the casing and the circuit board is rotated, each cut-and-raised portion sandwiches the inner end of the opening between the tip and the bottom wall.

As described above, the casing can be attached to the circuit board by a simple operation of rotating at least one of the casing and the circuit board after inserting each cut-and-raised portion into each opening. Further, by a simple operation of rotating at least one of the casing and the circuit board in a direction opposite to the above-described rotating direction, the engagement of each cut-and-raised portion with each opening is released, and the casing is removed from the circuit board. It can be easily removed.

According to the second aspect of the present invention, at least two cut-and-raised portions are cut and raised outwardly in a U-shape on the bottom wall of the casing. The circuit board has openings formed at positions corresponding to the cut-and-raised portions. Then, the bottom wall of the casing is attached to the circuit board by inserting each cut-and-raised portion into each opening while deforming the cut-and-raised portion against its elasticity at the U-shaped portion, and then returning the U-shaped portion to the original shape. It has been done by that.

As described above, the casing can be easily attached to the circuit board by a simple operation of inserting the cut-and-raised portions into the respective openings of the circuit board in the thickness direction as described above. In addition, when performing maintenance and inspection of the indicator, the casing is easily removed from the circuit board by a simple operation of pulling out each cut-and-raised portion from each opening with the opening width of the U-shaped portion of each cut-and-raised portion narrowed. be able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a cross coil type indicating instrument for a vehicle. This cross-coil type indicating instrument has a hollow bobbin 1 as a housing.
0, and the bobbin 10 includes a lower bobbin member 1
0a and the upper bobbin member 10b.
The bobbin 10 is housed in a shield casing 20 having a U-shaped cross section at its lower bobbin member 10a, and is attached to the circuit board 30 together with the shield casing 20 as described later.

A double cross coil 40 is wound around the outer wall of the large-diameter hollow portion 11 of the bobbin 10, and each terminal of the double cross coil 40 is connected to each terminal extending from the inside of the peripheral wall of the bobbin 10. 50 are respectively connected to the upper ends. The pointer shaft 60 is coaxially inserted into the bobbin 10, and the pointer shaft 60 is rotatably supported at its lower end in the lower cylindrical small-diameter portion 12 of the bobbin 10.
The upper intermediate portion of the pointer shaft 60 is rotatably supported in the upper cylindrical small diameter portion 13 of the bobbin 10.

Thus, the pointer shaft 60 is rotatably supported coaxially in the bobbin 10, and at the upper end thereof,
It extends upward from the bobbin 10. Magnet 7
0 is a pointer shaft 60 inside the large-diameter hollow portion 11 of the bobbin 10.
The magnet 70 is coaxially supported by the lower intermediate portion, and rotates by receiving the combined electromagnetic force from the two cross coils 40 to rotate the pointer shaft 60.

The light guide plate 80 and the scale plate 90 are provided on the bobbin 1.
At 0, it is attached by screwing the four arm-shaped flange portions 14 together. The terminals 50 are located corresponding to the flanges 14. The pointer 100 is coaxially press-fitted from the outside to the upper end of the pointer shaft 60 extending through the central holes of the scale plate 90 and the light guide plate 80 at the boss 101.

Here, a structure for attaching the shield casing 20 to the circuit board 30 will be described with reference to FIGS. As shown in FIGS. 1 to 3, each cut-and-raised portion 22 is cut and raised in the bottom wall 21 of the shield casing 20 along the circumferential direction of the bottom wall 21 so as to extend outward. The cut-and-raised portion 22 is bent in an L-shape toward the lower end portion 51 of each corresponding terminal 50 at the tip end portion 22a.

In each of the arc-shaped openings 23 formed in the bottom wall 21 by cutting and raising each of the cut and raised portions 22,
The lower end 51 of each terminal 50 is bent in an L shape and extends. On the other hand, in the substrate portion of the circuit board 30 corresponding to the bottom wall 21, arc-shaped opening holes 31 are formed so as to respectively correspond to the cut-and-raised portions 22, as shown in FIGS. Each of these openings 3
Each of the cut-and-raised portions 22 is inserted into 1.

Each cut-and-raised portion 22 is in contact with the inner end 31a of each opening 31 at its rising portion. As a result, each cut-and-raised portion 22 has its tip 2
At 2a, the circuit board 30 is sandwiched between the circuit board 30 and the bottom wall 21. In FIG. 4, each reference numeral 32 indicates a wiring pattern of the circuit board 30. In the first embodiment configured as described above, the shield casing 20 is attached to the circuit board 30 as follows.

The indicator is connected to the circuit board 30 of the configuration shown in FIG.
Prepare with the configuration excluding. Then, the cut-and-raised portions 22 of the bottom wall 21 are inserted into the corresponding openings 31 of the circuit board 30 so that the bottom wall 21 of the shield casing 20 is aligned with the corresponding board portion of the circuit board 30. At this time, each cut-and-raised portion 22 is held in a state of protruding from each corresponding opening 31 at the tip portion 22a.

Thereafter, the shield casing 20 is rotated along the circuit board 30 so that the rising portions of the cut-and-raised portions 22 abut on the inner ends 31 a of the corresponding openings 31. Accordingly, each of the cut-and-raised portions 22 has its tip 2
At 2a, a portion near each inner end 31a of the circuit board 30 is sandwiched between the inner wall 31a and the bottom wall 21.

As described above, the shield casing 20 is easily attached to the circuit board 30 by a simple operation of rotating the shield casing 20 with respect to the circuit board 30 after inserting the cut-and-raised portions 22 into the corresponding openings 31. Can be attached to Further, the engagement of each cut-and-raised portion 22 with each opening 31 is released by a simple operation of rotating the shield casing 20 with respect to the circuit board 30 in a direction opposite to the above-described rotation direction. Therefore, the shield casing 20 can be easily removed from the circuit board 30 even when performing maintenance and inspection of the indicating instrument.

FIGS. 5 to 8 show a second embodiment of the present invention. In the second embodiment, the bottom wall 21 of the shield casing 20 described in the first embodiment includes:
Each cut-and-raised portion 23 replaces each cut-and-raised portion 22,
As shown in FIGS. 5 and 6, the bottom wall 22 is formed so as to be cut and raised outward along the circumferential direction of the bottom wall 22. The tip 23a of each of the cut-and-raised portions 23 is bent into a U-shape toward the lower end 51 of the corresponding terminal 50 to form a U-shape.

Here, the lower end 51 of each terminal 50
Extend into the respective openings 24 formed in the bottom wall 21 by the cut-and-raised portions 23.
On the other hand, each opening 33 having a planar shape shown in FIG.
Instead of each opening hole 31 described in the first embodiment,
As shown in FIG. 7, each cut-and-raised portion 23 is formed so as to correspond to each of the cut-and-raised portions 23. In each of these openings 33, each cut-and-raised portion 23 is opposed to the elasticity of its U-shaped portion 23a. Has been inserted.

As shown in FIG. 7, each of the openings 33 is formed to have a narrow width along the radial direction of the bottom wall 21, and the width of each of the openings 33 is equal to the U-shaped portion 23a. Is smaller than the opening width. In addition, each cut-and-raised portion 23
Is the inner wall 33a of each opening 33 at the rising portion.
And the U-shaped portion 2 of each of the cut-and-raised portions 23
3a has an inner wall 33 at the tip thereof on the lower surface of the circuit board 30.
a is in the vicinity of a.

Thus, each of the cut-and-raised portions 23 holds the circuit board 30 between the cut-and-raised portion 23 and the bottom wall 21 at the U-shaped portion 23a. In FIG. 7, each reference numeral 34 denotes a circuit board 3
0 shows a wiring pattern. In the second embodiment thus configured, the shield casing 20 is mounted on the circuit board 3.
In order to attach the indicator to 0, the indicating instrument is prepared in a configuration excluding the circuit board 30 in the configuration of FIG.

The bottom wall 2 of the shield casing 20
1 to the corresponding board portion of the circuit board 30, and the bottom wall 21
Of the corresponding opening 3 of the circuit board 30
3 (see FIG. 8). At this time, the U-shaped portion 23a of each cut-and-raised portion 23 is inserted into each opening 33 against its elasticity.

After that, each opening 3 of each cut-and-raised portion 23
When the insertion into 3 is completed, the U-shaped portion 23a of each cut-and-raised portion 23 returns to its original shape, and abuts on the lower surface of the circuit board 30 at its tip. At this time, the rising portions of the cut and raised portions 23 are in contact with the inner walls 33 a of the openings 33. As a result, each cut-and-raised portion 23 has its U-shaped portion 2
At 3a, a portion near each inner wall 33a of the circuit board 30 is sandwiched between the bottom wall 21 and the bottom wall 21.

As described above, the shield casing 20 can be easily attached to the circuit board 30 by a simple operation of inserting the cut-and-raised portions 23 into the respective openings 33 in the thickness direction thereof. Further, the shield casing 20 is easily removed from the circuit board 30 by a simple operation of pulling out each cut-and-raised portion 23 from each of the openings 33 in a state where the opening width of the U-shaped portion 23a of each of the cut-and-raised portions 23 is narrowed. be able to. Thus, the shield casing 20 can be easily removed from the circuit board 30 even when performing maintenance and inspection of the indicating instrument.

In practicing the present invention, the present invention is not limited to the cross-coil type indicator, but may be a rotary coil type indicator, a movable iron type indicator, or an indicator using a stepping motor as a driving source. Even when the present invention is applied to an indicating instrument having a pointer shaft, the same operation and effect as the above embodiment can be achieved. The indicating instrument is not limited to a vehicle, and the present invention may be applied to an indicating instrument used in various industries.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an indicating instrument according to the present invention.

FIG. 2 is a partially enlarged sectional view of the indicating instrument.

FIG. 3 is a bottom view of a shield casing showing a positional relationship between each terminal and each opening of a circuit board.

FIG. 4 is a partially enlarged plan view of the circuit board 30.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 6 of the second embodiment of the present invention.

FIG. 6 is a bottom view of the shield casing showing a positional relationship between each terminal of FIG. 5 and each opening of the circuit board.

7 is a partially enlarged plan view of the circuit board 30 of FIG.

8 is a perspective view showing a process of inserting each cut-and-raised portion of the shield casing into each opening of the circuit board of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Bobbin, 20 ... Shield casing, 21 ... Bottom wall, 22, 23 ... Cut-and-raised part, 22a ... Tip part, 23
a: U-shaped portion, 31, 33: opening, 31a: inner end face, 3
3a: inner wall, 30: circuit board, 40: cross coil, 60
... Pointer shaft, 70 ... Magnet.

Claims (2)

[Claims] A driving unit (1) for swinging a pointer (100).
0, 40, 60, 70), a casing (20) accommodating the drive unit, and a circuit board (30) attached to the bottom wall (21) of the casing and electrically connected to the drive unit. And at least two cut-and-raised portions (22) are cut and raised in an L-shape outward along the circumferential direction of the bottom wall on the bottom wall of the casing; An opening (31) is formed in the board at a position corresponding to each of the cut-and-raised portions, and the bottom wall of the casing is attached to the circuit board,
With at least one of the circuit board and the casing being rotated in a state where the cut-and-raised portions are inserted into the respective opening portions, a tip portion (22a) of the cut-and-raised portion is rotated.
Inner ends (31a) of the openings between the base and the bottom wall
An indicating instrument characterized by being sandwiched by 2. A drive unit (1) for swinging a pointer (100).
0, 40, 60, 70), a casing (20) made of an elastic material accommodating the driving section, and attached to the bottom wall (21) of the casing and electrically connected to the driving section. An indicating instrument comprising a circuit board (30), wherein at least two cut-and-raised portions (23) are cut and raised outward in a U-shape on a bottom wall of the casing; An opening (33) is formed at a position corresponding to each of the cut-and-raised portions, and the bottom wall of the casing is attached to the circuit board,
The cut-and-raised portion is inserted into each of the openings while being deformed against its elasticity at the U-shaped portion (23a) thereof, and then the U-shaped portion is returned to the original shape. Indicating instrument to do.