JP3082194B2 - Instrument equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a case is provided between a display panel and a circuit board, and an electronic component storage chamber for storing electronic components mounted on the circuit board facing the circuit board. A lighting device for guiding light from a light source provided on the circuit board facing the display board toward the display board side, with respect to a case structure having improved heat dissipation and dustproofness. Things.

[0002]

2. Description of the Related Art Conventionally, as a meter device of this type, as shown in FIGS. 3 and 4, for example, a pointer B and a display plate C are provided as a meter display portion on the front side of a case A.
A circuit board D on which a predetermined circuit pattern is formed is provided on the back side of the case A. A movement E for driving hands and an electronic device for supplying a predetermined rotation signal to the movement E are provided on the circuit board D. A component F, a light source G for illuminating the display panel C and the pointer B, and the like are attached, and power supply and signal transfer are performed via the circuit board D.

In consideration of ease of assembling components to the case A, strength of the case A, and illumination performance of the display panel C, the case A faces the circuit board D and is mounted on the circuit board D. An electronic component storage room H for storing an electronic component F, and an illumination room I for guiding light from a light source G provided on the circuit board D facing the display panel C toward the display panel C are formed. And the electronic component storage room H
And a lighting wall I for separating the lighting room I, and a recent instrument case has a side wall K when viewed in a sectional view.
And a case structure having a generally H-shaped cross section composed of the partition wall J.

A gap L is provided between the end of the display panel C and the inner wall of the case A of the illumination room I, and a gap N is also provided between the facing plate M covering the periphery of the display panel C and the display panel C. By providing the light, the light from the light source G provided on the circuit board D is reflected toward the display panel C side by the illumination room I, and the display panel C is transmitted and illuminated. The gap L between the end case and the gap N between the dial plate M and the display panel C
The display panel C and the pointer B are illuminated by irradiating the display panel C and the pointer B with so-called indirect light that leaks from the display panel C to the front side.

A ventilation hole O for heat dissipation is formed in the side wall K of the case A of the electronic component storage room H, and the circuit board D
The heat generated from the light source G and other electronic components F mounted on the case A is dissipated to the outside of the case A via the ventilation holes O for heat dissipation to prevent an excessive rise in the temperature inside the case A, and the movement E and the The effect of heat on the electronic component F and the case A is suppressed.

[0006]

However, in the above-mentioned conventional configuration, it is not possible to increase the size of the heat-dissipating ventilation hole O provided in the side wall K of the electronic component storage chamber H. In other words, in order to further dissipate heat, it is conceivable to provide a heat radiation vent on the side wall K of the lighting room I. However, if the heat radiation vent is provided in this lighting room I,
There has been a problem that the reflected light in the illumination room I leaks from the heat-dissipating air holes, and the illumination efficiency is reduced. Further, in the illumination structure using indirect light as in this instrument, gaps L and M exist between the end of the display panel C and the inner wall of the case A of the illumination room I, and between the display panel C and the return panel M. Therefore, if a ventilation hole for heat radiation is opened in the side wall K of the illumination room I, if dirt or dust enters from the opening, the dirt or dust becomes a display portion of the meter through the gaps L and M. There is a risk that the appearance will be degraded, as it will enter the plate C and be visually recognized. In this type of instrument case, it is generally avoided to provide the heat dissipation hole O in the side wall K of the illumination room I. There were many.
Under these circumstances, the side wall K of the case A of the electronic component storage room H
The height dimension x of the heat-dissipating vent hole O formed in the above-described embodiment is limited to the distance from the partition wall J to the circuit board D. Therefore, heat is not sufficiently dissipated in the electronic component storage room H and the temperature rises. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an instrument device capable of sufficiently dissipating heat in an electronic component storage room and preventing entry of dust and dirt on a display panel.

[0008]

According to the present invention, in order to achieve the above object, a case is provided between a display panel and a circuit board, and the case is mounted on the circuit board so as to face the circuit board. An electronic component storage room for storing electronic components, an illumination room facing the display panel and guiding light from a light source provided on the circuit board toward the display panel side, the electronic component storage room and the illumination room And a partition wall for dividing the electronic component storage room in the vicinity of the side wall of the case toward the lighting room side.
A ventilation hole for heat radiation is provided on a side wall of the case corresponding to the electronic component storage room enlarged by the projection.

In addition, a pointer is provided on the display panel, a gap is formed between the display panel and the inner wall of the case, and light from the light source in the lighting room is guided to the surface of the display panel through the gap. The display plate and the pointer are illuminated by the light.

[0010] Further, a reflection surface is provided on the protruding portion in the lighting room.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pointer and a display plate as a meter display section are provided on the front side of a case, and a circuit board on which a predetermined circuit pattern is formed is provided on the back side of the case.

The case includes an electronic component storage chamber facing the circuit board and housing electronic components mounted on the circuit board; and a light source provided on the circuit board facing the display board and receiving light from the light source. A lighting room for guiding toward the side, and a partition wall for dividing the electronic component storage room and the lighting room is provided. A projecting portion is provided on the partition wall near the side wall of the case to enlarge the electronic component storage room toward the illumination room, and the electronic component storage room is enlarged by the projecting portion. Then, a ventilation hole for heat radiation is formed in the side wall of the case corresponding to the size of the electronic component storage room which is formed in an enlarged manner.

[0013] By doing so, the heat-dissipating ventilation holes in the electronic component storage room can be formed larger than those in the related art, so that the heat generated in the electronic component storage room can be ventilated through the heat-dissipation ventilation holes. Thus, the heat can be more effectively dissipated to the outside of the case.

Further, since the lighting room is separated from the electric component storage room by the partition wall, even if dirt and dust enter the case through the ventilation holes for heat dissipation, they stay in the electric component storage room and remain in the lighting room. It does not enter, and is prevented from floating on the display panel located on the front side of the lighting room.

Further, since the lighting room is not provided with a ventilation hole for heat dissipation, light can be prevented from leaking from the lighting room to the outside of the case, and good instrument lighting can be performed without lowering lighting efficiency.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 illustrate a pointer-type instrument device as one embodiment of the present invention.

In the instrument device of this embodiment, a hand 2 and a display plate 3 are provided as a meter display section on the front side of a case 1, and a circuit on which a predetermined circuit pattern is formed is provided on the back side of the case 1. A substrate 4 is provided.

On the circuit board 4, a movement 5 for driving the hands, an electronic component 6 for supplying a predetermined rotation signal to the movement 5, a light source 7 for illuminating the display plate 3 and the hands 2 and the like are mounted. The circuit board 4
The power supply and the signal transfer are performed via the.

The case 1 includes the circuit board 4
And an electronic component storage chamber 8 for storing an electronic component 6 mounted on the circuit board 4, and a light from a light source 7 provided on the circuit board 4 to face the display panel 3.
And an illumination room 9 for guiding the electronic component storage room 8, and a partition wall 10 for dividing the electronic component storage room 8 and the illumination room 9 is provided.

A hole 11 is provided in the partition wall 10 of the case 1 so that the movement 5 provided on the circuit board 4 can be inserted, and the light source 7 can be inserted into the illumination room 9. A hole 12 is provided.

A gap 13 is provided between the end of the display panel 3 and the inner wall of the case 1 of the lighting room 9 and the display panel 3
The gap 1 is also provided between the facing plate 14 and the display plate 3 that cover the periphery of the
5, the light from the light source 7 provided on the circuit board 4 is reflected toward the display panel 3 by the illumination room 9 to illuminate the display panel 3 in a transmissive manner. The display plate 3 and the pointer 2 are illuminated by so-called indirect light leaking from the gap 13 between the inner wall of the case 1 at the end of the case 3 and the gap 15 between the display plate 3 and the facing plate 14 to the front side of the display plate. It is.

The light source 7 or the heat-generating electronic components 6 provided on the circuit board 4 generally exposes the interior of the electronic component storage room 8 to a high-temperature atmosphere. The vicinity of the side wall 16 of the case 1 which is the end of the electronic component storage room 8 is protruded from the electronic component storage room 8 side toward the lighting room 9 so that the electronic component storage room 8 is enlarged at this portion. A protruding portion 17 is provided near the side wall 16 of the case 1 to enlarge the electronic component storage room 8 toward the illumination room 9. Then, a large space is generated in the vicinity of the side wall 16 of the electric component storage room 8. However, according to the present invention, the electric component storage room 8 is further provided on the side wall 16 of the case 1 corresponding to the enlarged electric component storage room 8. A ventilation hole 18 for heat radiation that connects the chamber 8 with the outside of the case 1 is provided.

By doing so, the heat-dissipating ventilation holes 18 provided in the side walls 16 of the electronic component storage room 8 can be formed larger than those in the related art.
The heat generated inside is ventilated through the heat-dissipating ventilation holes 18 so that the heat can be more effectively radiated to the outside of the case 1. In this case, the height X of the heat-dissipating ventilation hole 18 is set to be equal to the size of the protruding portion 1 in the enlarged electronic component storage room 8.
7 to the circuit board 4.

Also, the gap 13 between the lighting structure of the instrument by such indirect light, that is, the inner wall of the case 1 of the lighting room 9.
And a return plate 14 that covers the periphery of the display plate 3.
Even if the structure is such that a gap 15 is also provided between the lighting device 9 and the display panel 3, the lighting room 9 is separated from the electrical component storage room 8 by the partition wall 10, so that the heat dissipation vent 18
Even if dust or dust enters the case 1, the dust or dust stays in the electrical component storage room 8, and the dust or dust does not enter the lighting room 9 but on the display panel 3 located on the front side of the lighting room 9. Embossing is prevented.

Further, since the lighting room 9 is not provided with a ventilation hole for heat radiation, light can be prevented from leaking from the lighting room 9 to the outside of the case 1 and good instrument lighting can be performed without lowering lighting efficiency. Become.

Further, since the ventilation holes 18 for heat radiation are formed in the side wall 16 of the case 1 of the electronic component storage room 8, heat generated from the light source 7 mounted on the circuit board 4 and other electronic components 6 is formed. Is dissipated to the outside of the case 1 through the heat-dissipating ventilation holes 18 to prevent an excessive temperature rise inside the case 1,
The influence of heat on the movement 5, the electronic components 6, and the case 1 is suppressed.

Therefore, in the present invention, a case which is an end portion of the partition wall 10 is substantially the same as the conventional partition wall 10 which has a generally H-shaped cross section and is substantially in one plane parallel to the display panel 3 and the circuit board 4. The side wall 16 of the electronic component storage room 8 is formed by projecting the vicinity of the side wall 16 from the electronic component storage room 8 side toward the lighting room 9 to enlarge the electronic component storage room 8 at this portion. By forming a heat-dissipating air vent 18 near this portion 16 larger by the size of the conventional heat-dissipating device, heat generated from the light source 7 and other electronic components 6 mounted on the circuit board 4 can be dissipated. The heat is radiated to the outside of the case 1 through the pores 18 to prevent an excessive rise in the temperature inside the case 1, and the influence of heat on the movement 5, the electronic component 6, and the case 1 can be suppressed.

At this time, in order to enlarge the ventilation hole 18 for heat dissipation, the entire electronic component storage room 8 is enlarged to
Since the height dimension of the case 1 is not increased, the size of the vent hole 18 for heat radiation can be sufficiently secured while the height dimension of the case 1 is suppressed.

Further, according to the present invention, the projecting portion 17 located in the illumination room 9 is provided with a reflecting surface 19 formed of an arc-shaped surface. The reflection surface 19 is displayed by setting an angle so as to brighten a dark place of the display plate 3 to be transmitted or indirectly illuminated and to supplement light, or to form the shape into an inclined surface, an arc-shaped surface, or a parabolic shape. The whole plate 3 is to be illuminated almost uniformly. Thus, in this embodiment,
Projection 1 integrally formed from partition wall 10 of case 1
7 is configured as the reflection surface 19, and can be easily configured without providing other components.

[0030]

As described above, according to the present invention, it is possible to provide an instrument device capable of sufficiently dissipating heat in the electronic component storage room and preventing entry of dust and dirt on the display panel.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing one embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Pointer 3 Display board 4 Circuit board 6 Electronic component 7 Light source 8 Electronic component storage room 9 Illumination room 10 Partition wall 13 Gap 16 Side wall 17 Projecting part 18 Vent hole for heat radiation 19 Reflection surface

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01D 11/24 G01D 11/28

Claims (3)

(57) [Claims] 1. A case is provided between a display panel and a circuit board, wherein the case has an electronic component storage chamber for storing an electronic component mounted on the circuit board facing the circuit board.
An illumination room facing the display board and guiding light from a light source provided on the circuit board toward the display board side, and a partition wall separating the electronic component storage room and the illumination room, The partition wall is provided with a protruding portion that enlarges the electronic component storage room toward the lighting room near the side wall of the case, and the side wall of the case corresponds to the electronic component storage room enlarged by the protruding portion. An instrument device, characterized in that a vent hole for heat radiation is provided on the instrument. 2. A pointer is provided on the display panel, a gap is formed between the display panel and the inner wall of the case, and light from the light source in the lighting room is guided to the surface of the display panel from the gap. The instrument device according to claim 1, wherein the display plate and the pointer are illuminated by the light. 3. The instrument device according to claim 1, wherein a reflection surface is provided on the protrusion in the lighting room.