JP2927057B2 - Vehicle instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument for a vehicle such as a speedometer and a tachometer.

[0002]

2. Description of the Related Art In a vehicle instrument, since a case for accommodating the instrument main body is made of resin, it is important to take measures for suppressing a rise in temperature inside the case. Therefore, conventionally, a structure has been adopted in which a slit is provided on the back surface of the case and the like, and the heat inside the case is released to the outside through the slit.

[0003]

However, although the above structure has the effect of suppressing the temperature rise inside the case to some extent, there is a possibility that outside dust or dust may enter the case through the slit. growing. This is because the instrument is visible to vehicle occupants,
The visibility of the instrument deteriorates, and it also becomes a factor that impairs the appearance.

[0004] The present invention has been made based on the above circumstances, and an object of the present invention is to provide a vehicular instrument which suppresses a rise in temperature inside a case and is provided with dustproof measures.

[0005]

SUMMARY OF THE INVENTION A vehicle instrument according to the present invention comprises:
In order to achieve the above object, a flexible printed board is provided on the back surface of a case accommodating the instrument body, and in order to prevent the end of the flexible printed board from protruding from the outer peripheral edge of the case, the flexible printed board is provided with a flexible printed board. A vehicular instrument in which a groove for bending and inserting an end portion of the flexible printed board is formed on an outer peripheral surface of the back surface, wherein the case penetrates through a bottom wall of the groove to communicate inside and outside of the case. The provision of the holes is a technical measure.

[0006]

According to the present invention having the above structure, the heat inside the case is radiated to the outside through the through hole formed at the bottom of the groove.
The temperature rise inside the case can be suppressed. Also, since the end of the flexible printed board disposed on the back of the case is inserted into the groove, the opening surface of the through hole formed at the bottom of the groove is effectively closed by the flexible printed board. Will be. Therefore, the through-hole is not exposed to the outside of the case, and it is possible to prevent external dust and dust from entering the inside of the case through the through-hole.

[0007]

FIG. 1 shows an embodiment of a vehicle instrument according to the present invention.
This will be described with reference to FIG. FIG. 1 is a side sectional view of a vehicle instrument. The instrument 1 for a vehicle according to the present embodiment is, for example, a speedometer or a tachometer.
And a case 3 for accommodating the instrument main body 2 and a flexible printed board 4 disposed on the back surface of the case 3.

The instrument body 2 is fixed to a bottom surface (right side in FIG. 1) of the case 3 by a screw (not shown), and a design such as a numeral or a mark is printed on an upper end surface (left side in FIG. 1). The dial 5 is attached. A rotating shaft 6 is provided at the center of the instrument main body 2 so as to protrude therefrom.
Is provided with a pointer 7 for indicating the scale of the dial 5 according to the rotation speed of the engine.

The case 3 is made of a resin having a thickness of 2 mm (for example,
The front side (the left side in FIG. 1) of the box body is opened. A transparent protective cover 8 is mounted on the front surface of the opened case 3.
At the bottom of the case 3, a lamp 9 for night illumination or warning display is attached.

The flexible printed board 4 is made of, for example, a polyester film having a thickness of 0.2 mm.
Are press-fitted into and supported by several pins 10 appropriately provided on the back surface of the. In addition, the material of the flexible printed board 4 is not limited to a polyester film.

As shown in FIG. 2 (enlarged view of the groove 11), the vehicle instrument 1 prevents the end of the flexible printed board 4 from protruding from the outer peripheral edge of the case 3 as shown in FIG.
A groove 11 is formed in the outer peripheral portion of the back surface of the case 3, and the groove 11
The end of the flexible printed board 4 is bent and inserted.

The case 3 is provided with a through hole 12 penetrating through the bottom wall of the groove 11 and communicating inside and outside the case 3. The through holes 12 are provided to suppress a rise in the temperature inside the case 3, and as shown in FIG. 3 (a plan view of the back surface of the case 3), 4 effectively prevents the opening surface of the through hole 12 from being exposed to the outside.

As described above, by providing the through hole 12 at the bottom of the groove 11, as shown by the solid line arrow in FIG.
The heat inside the case 3 is released to the outside of the case 3 through the through-holes 12, and the rise in the temperature inside the case 3 can be suppressed. Further, since the through-hole 12 is closed by the flexible printed board 4 inserted into the groove 11, even when outside dirt or dust tries to enter the inside of the case 3 through the through-hole 12. As shown by the dashed arrow in FIG. 2, the flexible printed circuit board 4 blocks the case 3 from entering.

[0014]

According to the vehicle instrument of the present invention, the through hole is provided at the bottom of the groove to suppress the temperature rise inside the case, and the through hole is effectively formed by the flexible printed board inserted into the groove. By being closed, the dustproof effect can be achieved. Therefore, the visibility of the instrument can be secured, and the appearance is not impaired.

[Brief description of the drawings]

FIG. 1 is a sectional view of an instrument for a vehicle.

FIG. 2 is an enlarged view of a groove portion.

FIG. 3 is a plan view of the back surface of the case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle instrument 2 Instrument main body 3 Case 4 Flexible printed board 11 Groove 12 Through hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01D 11/24

Claims (1)

(57) [Claims] A flexible printed board is provided on a back surface of a case accommodating an instrument body, and an outer peripheral portion of the back surface of the case is provided to prevent an end of the flexible printed board from protruding from an outer peripheral edge of the case. Wherein a groove for bending and inserting an end of the flexible printed board is formed in the vehicle, wherein the case is provided with a through hole penetrating a bottom wall of the groove and communicating with the inside and outside of the case. An instrument for a vehicle, characterized in that: