JP5403354B2 - Display device - Google Patents

Description

  The present invention relates to a display device used as, for example, a vehicle instrument for automobiles, motorcycles, agricultural machinery, and construction machinery, and particularly relates to a ventilation structure between the inside and the outside.

  As this type of display device, for example, a display device described in Patent Document 1 below is known. The display device includes a liquid crystal display and a pointer-type instrument, a circuit board disposed behind the display, and a back cover that covers the back side of the circuit board with a first space portion therebetween. And a see-through cover that covers the front side of the display unit with the second space portion interposed therebetween. On both sides of the display unit, a gap (ventilation path) connecting the first space part and the second space part is formed, while a plurality of vent holes are formed in the back cover. The second space portion is ventilated through the space portion and the air passage to prevent fogging inside the fluoroscopic cover.

JP 2002-323351 A

  However, since the display device described in Patent Document 1 is merely provided with a plurality of air holes in the back cover, the inside air (circuit) is present in the first space (between the back surface of the circuit board and the back cover). The air heated by the heat generated from the substrate) mixes with the outside air taken in through the vents and reaches the second space, so it is difficult to introduce fresh outside air into the second space, For this reason, sufficient anti-fogging effect may not be obtained.

  Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide a display device that can easily introduce fresh outside air between a display and a front cover and can improve anti-fogging properties. And

The present invention relates to a display, a circuit board disposed behind the display, a back cover that covers the back side of the circuit board with a first space therebetween, and a front side of the display to a second side. A plurality of see-through covers that cover the space portion and form a ventilation path that connects the first space portion and the second space portion, and connects the first space portion and the outside to the back cover. In the display device in which the air holes are formed, of the plurality of air holes, the first space portion is opposed to the circuit board and the back cover around a predetermined air hole corresponding to the air passage. It is characterized by providing a wall portion that partitions in a direction.
With this configuration, since the periphery of the predetermined vent corresponding to the air passage is partitioned by the wall portion, the warm inside air existing in the first space is mixed with the outside air taken in through the predetermined vent. Thus, fresh outside air can be introduced into the second space to improve the anti-fogging property.

The present invention further includes a case body having a third space portion for housing at least a part of the display between the see-through cover and the circuit board, and the air passage communicates with the third space portion. It is characterized by doing.
By comprising in this way, ventilation of a 3rd space part is enabled and air permeability can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can improve anti-fogging property can be provided.

The front view of the display apparatus by one Embodiment of this invention. AA sectional drawing of FIG. 1 (hatching is abbreviate | omitted). BB sectional drawing of FIG. 1 (hatching is abbreviate | omitted). The rear view of the display apparatus by the embodiment. The front view which shows the front side of a back cover.

  A display device according to an embodiment of the present invention is a vehicle instrument, for example, and includes a fluoroscopic cover (front cover) 1, first to fourth indicators 2 to 5, a case body 6, a circuit board 7, The rear cover 8 is configured.

  The see-through cover 1 is made of, for example, a transparent synthetic resin, and is formed as a box whose rear side is open, and the bottom surface (bottom wall surface) of the first to fourth displays 2 to 5 is a space portion (second space). The first to fourth indicators 2 to 5 can be seen through through the bottom surface.

  The first indicator 2 includes, for example, a pointer-type meter that indicates the remaining fuel, and includes a pointer 21, a fuel index 22 that is an instruction target of the pointer 21, and a stepping that drives the pointer 21 according to the amount of remaining fuel. And a drive main body 23 including a motor and a cross coil type electric motor.

  The second indicator 3 is composed of, for example, a pointer-type meter that indicates the cooling water temperature. The pointer 31, the water temperature index 32 that is the target of the pointer 31, the stepping motor that drives the pointer 31 according to the water temperature, and the intersection And a drive body 33 made of a coil-type electric motor.

  The third indicator 4 includes, for example, indicators for emitting and displaying various alarms and notification information. The third indicator 4 includes a plurality of marks 41 and light emitting diodes corresponding to each of the marks 41, and transmits the corresponding marks 41 by lighting. And a light source 42 for illuminating and displaying various alarms and notification information.

  The fourth display 5 is a segment-type liquid crystal display that digitally displays, for example, a travel distance and work time, and includes a liquid crystal panel 51, a light source (not shown), and the like.

  Each of the fuel index 22, the water temperature index 32, and the mark 41 is, for example, printed on a single display panel P. This display panel P is obtained by screen printing on a base material made of a synthetic resin, and openings are formed at locations corresponding to the liquid crystal panel 51, locations corresponding to the hands 21, and locations corresponding to the hands 31.

  The case body 6 is composed of a bottomed frame body that opens to the front and back using, for example, white synthetic resin, and includes a peripheral wall portion 61 and a bottom wall portion 62, and the display panel P and the liquid crystal on the front opening side. While supporting the panel 51, the back cover 8 is arrange | positioned at the back opening part side.

  On the back surface of the bottom wall portion 62 facing the back cover 8, the circuit board 7 is disposed and fixed to the bottom wall portion 62 together with the drive main bodies 23 and 33 by screws (see FIG. 3).

  The bottom wall portion 62 corresponding to each light source 42 is a through hole, and a plurality of cylindrical portions 63 extending toward each mark 41 are formed so as to surround the periphery of the through hole.

  Between the bottom wall portion 62 and the peripheral wall portion 61 corresponding to a predetermined vent described later, an internal space (third space portion) 6a of the case body 6 and a space portion (first space portion) described later are provided. The first cutout portion 64 is formed, and the first cutout portion 64 is formed with a cylindrical barrier 65 projecting and extending toward the back cover 8, and the tip of the barrier 65 is formed on the circuit board. 7 extends to the back cover 8 side to prevent entry of dust and dirt to the space portion FS side.

  Further, on the front opening side corresponding to the first cutout portion 64, a second cutout portion 66 for forming a partial gap between the peripheral wall portion 61 and the display panel P is formed and the display panel is formed. A gap S is formed between the end of P on the side of the second notch 66 and the see-through cover 1, and the gap S and the second notch 66, the internal space 6a, and the first notch 64. Thus, a ventilation path V that communicates the space portion FS with a space portion to be described later is formed.

  The circuit board 7 is made of a hard single wiring board formed by printing a circuit pattern on an insulating member such as paper phenol or glass epoxy, and is formed in a size smaller than the bottom wall part 62. A gap is formed between them and is fixed to the case body 6 so as not to block an air passage described later.

  The back cover 8 is made of, for example, a transparent or translucent synthetic resin, and covers the back side of the circuit board 7 with a space (first space) BS therebetween.

  A plurality of (six in total) vent holes 82 and 83 are formed in the bottom wall portion 81 of the back cover 8. These vent holes 82 and 83 communicate the space BS with the outside, and have a cross-sectional shape formed in a labyrinth to prevent entry of dust, dust, water droplets and the like.

  Among the vent holes 82 and 83, the predetermined vent hole 83 is located in the vicinity of the first cutout portion 64, communicates with the vent path V via the space portion BS, and fresh fresh air is passed through the space portion BS. In addition, the inside of the fluoroscopic cover 1 is prevented from being fogged by being guided to the space portion FS via the ventilation path V and discharging the inside air.

  On the front side of the bottom wall portion 81 of the back cover 8, a wall portion 84 is formed extending around the circuit board 7 or the case body 6 so as to surround a region including the predetermined vent 83 and the first notch portion 64. ing. The wall 84 partitions (divides) the space BS in the facing direction of the circuit board 7 and the back cover 8, and the inside air heated by the heat of the circuit board 7 on which the light source 42 and the heating element (not shown) are mounted. The IA is blocked around the air vent 83 to prevent the inside air IA from being mixed with the outside air (fresh air) OA taken through the air vent 83 and reaching the space portion FS. The inside air IA in the space BS is discharged to the outside through another vent hole 82. Therefore, fresh outside air can be more intensively introduced into the space FS.

  As described above, according to the present embodiment, the display devices 2 to 5, the circuit board 7 disposed behind the display devices 2 to 5, and the back side of the circuit board 7 are arranged in the space portion (first space). Part) The back cover 8 that covers the BS with a space therebetween, and the fluoroscopic cover 1 that covers the front side of the displays 2 to 5 with the space portion (second space portion) FS therebetween, the space portion BS and the space portion FS, In the display device in which a plurality of ventilation holes 82 and 83 that connect the space portion BS and the outside are formed in the back cover 8, a predetermined passage of the plurality of ventilation holes 82 and 83 is formed. Since the wall portion 84 that divides the space portion BS around the air holes 83 in the facing direction of the circuit board 7 and the back cover 8 is provided, the periphery of the air holes 83 corresponding to the air passages V is partitioned by the wall portions 84. The warm inside air IA present in the space BS is passed through a predetermined vent. Taken to prevent it mixes with the outside air, thereby improving the antifogging property by introducing fresh outside air intensively in the space FS.

  Moreover, in this embodiment, it has the case body 6 which has the internal space (3rd space part) 6a which accommodates a part of indicator 2-5 between the see-through cover 1 and the circuit board 7, and ventilating path V Communicates with the internal space (third space portion) 6a, thereby allowing the internal space to be ventilated and improving the air permeability.

  In the present embodiment, the case body 6 is employed, but the case body 6 may be eliminated. Further, the wall portion 84 has a structure in which the space portion BS is partitioned in the facing direction between the circuit board 7 and the back cover 8, and it is only necessary to block the transition of the (warmed) inside air IA to the ventilation path V side. In this way, the circuit board 7 and the case body 6 may be slightly separated from or in contact with each other. Furthermore, although the wall part 84 and the surrounding wall part 61 showed the example which shares a part in this embodiment, you may provide the wall part 84 independently.

1 perspective cover (front cover)
2-5 First to fourth indicators 6 Case body 7 Circuit board 8 Back cover 21 Pointer 22 Fuel indicator 23 Drive body 31 Pointer 32 Water temperature indicator 33 Drive body 41 Mark 42 Light source 51 Liquid crystal panel 61 Peripheral wall portion 62 Bottom wall portion 63 Tube portion 6a Internal space (third space portion)
64 1st notch part 65 Barrier 66 2nd notch part 82,83 Ventilation hole S Gap P Display panel V Ventilation path BS Space part (1st space part)
FS space part (second space part)
IA Inside air OA Outside air (fresh air)

Claims (2)

A display; a circuit board disposed behind the display; a back cover for covering the back side of the circuit board with a first space part; and a front side of the display with a second space part. A plurality of ventilation holes for connecting the first space and the outside to the back cover, and forming a ventilation path for connecting the first space and the second space. In the formed display device, a wall that partitions the first space portion in a facing direction between the circuit board and the back cover around a predetermined air hole corresponding to the air passage among the air holes. A display device characterized by comprising a section. A case body having a third space for accommodating at least a part of the display device is provided between the see-through cover and the circuit board, and the air passage communicates with the third space. The display device according to claim 1.

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