JP2012037375A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that excellently dissipates heat by increasing air permeability in a case, and thereby suppresses clouding of an internal surface of a through-view cover of the case.SOLUTION: In the display device including a lower case 4 housing display units 1, 2 and a circuit board 3, an upper case 5 having a see-through through-view panel 5A covering the display units 1, 2 and circuit board 3 in a sealed state, and a ventilation part 43 provided to the lower case 4 and having an air vent 43A linking a space part S formed of the upper case 5 and lower case 4 and the outside of the lower case 4 to each other, a ventilation path which connects a top side and a reverse side of the circuit board 3 can be formed at the space part S in the case which is likely to be divided by the circuit board 3 by providing through holes 31 linking the top and reverse of the circuit board 3 to each other, so that moisture, heat, etc., which are apt to stay in the case can be exhausted through the through holes 31.

Description

  The present invention relates to a display device in which a display such as an indicating instrument mounted on a vehicle such as an automobile, a motorcycle, a construction machine, or an agricultural machine is housed in a case body.

  As a display device mounted on a conventional vehicle or the like, for example, a display device described in Patent Document 1 below is known. This display device includes a display comprising a pointer-type indicator, a display using a liquid crystal display, a circuit board disposed behind the display, and a back cover (lower case) covering the back side of the circuit board. And a transparent cover (upper case) that covers the front side of the display and that allows at least the display area of the display to be visually recognized.

  At this time, in the display device covered with the upper and lower cases, in order to suppress the occurrence of fogging of the fluoroscopic cover located on the front side, the storage space on the inner side of the case covered in a sealed state; A plurality of ventilation holes communicating with the outside (outside air) are formed in the back cover (lower case), and the ventilation between the inside and outside of the case is measured through these ventilation holes.

JP 2002-323351 A

  However, in the display device described in Patent Document 1 described above, since only a plurality of vent holes are provided in the back cover (lower case), the back cover (lower case) and the front side are provided. The storage space inside the case may be divided by the circuit board disposed between the transparent cover (upper case) positioned.

  That is, in this type of display device, downsizing is desired in the overall configuration, and a circuit board that is electrically connected to the display so as to substantially match the external shape of the case, in this case, the internal shape of the case. The outer contour of the circuit board is formed and is set with almost no gap between the inner surface of the case and the outer peripheral edge of the circuit board. The inside of the case is separated, and the heat trapped on the surface of the circuit board cannot be exhausted (vented) to the outside through the vent hole provided in the bottom of the back cover (lower case) side. Sometimes.

  As a result, heat generated in the case, for example, air heated by a heat generating electronic component connected to the circuit board or a light source such as an LED cannot be exhausted (vented) sufficiently from the vent hole to the outside. There is.

  When the ventilation between the inside and outside of the case is impaired in this way, when the external atmosphere (outside air) is cold, the transparent cover that is in direct contact with the outside air It is cooled by touching the inner surface of the fluoroscopic cover. At this time, there is a problem that the phenomenon that water vapor in the air falls below the saturation point and the inner surface of the fluoroscopic cover is fogged due to the rapid cooling of the air.

  Therefore, the present invention pays attention to the above-mentioned problems, and in a display device in which a circuit board is housed in a case together with a display, heat dissipation is improved by improving the air permeability in the case, and the transparent cover of the case It is an object of the present invention to provide a display device capable of suppressing the fogging of the inner surface.

  In order to solve the above-described problems, the present invention provides a display device, a circuit board on which a driving circuit for driving the display device is mounted, and a circuit board and the display device that house the circuit board. A side case, an upper case having a transparent panel disposed in a front opening of the lower case and covering the display unit in a sealed state, and the upper case and the lower side provided in the lower case A display device comprising: a space formed by a case; and a ventilation portion having a ventilation hole that communicates the outside of the lower case. The circuit board has a through hole that communicates the front and back of the circuit board. The display device is characterized by being provided with holes.

  By configuring in this way, a through-hole that connects the front and back of the circuit board is provided in the space inside the case that is easily divided by the circuit board housed in the case (the upper case and the lower case). Can form a ventilation path that connects the front side and back side of the circuit board, which allows moisture and heat that tends to accumulate inside the case to be exhausted through the communication hole, and the fluidity of the air inside the case As compared with the prior art, the fogging phenomenon can be avoided.

  According to a second aspect of the present invention, in the display device according to the first aspect, the through hole is provided at a location corresponding to the vent hole position.

  By configuring in this way, the air flow between the inside and outside of the case can be achieved by aligning the arrangement positions of the vent holes provided in the lower case and the communication holes provided in the circuit board substantially coaxially. Can be performed smoothly, whereby heat and moisture in the case can be discharged.

  According to a third aspect of the present invention, in the display device according to the first or second aspect, the circuit board includes a first circuit board and a second circuit board arranged in a stacked state, and the lower case side. The display device is characterized in that the through-hole (communication hole) is provided in a circuit board located at the position.

  With this configuration, in the stacked circuit boards, the case (upper side) is provided via the vent hole provided in the lower case and the communication hole provided in the circuit board disposed on the lower case side. The air flow between the inner side and the outer side of the case and the lower case) can be performed smoothly, and air from the outside can be sent to the circuit board side arranged on the upper case side, resulting in the upper side It becomes possible to exhaust moisture, heat, etc., which tends to accumulate on the case side, through the communication hole, and the fluidity of the air inside the case can be improved compared to the conventional case.

  In the present invention, a display, a circuit board on which a drive circuit for driving the display is mounted, a lower case for housing the circuit board and the display, and a front opening of the lower case An upper case provided with a see-through see-through panel that covers the display in a sealed state, a space portion provided in the lower case and configured by the upper case and the lower case, and the lower case A display device comprising a ventilation portion having a ventilation hole communicating with the outside of the circuit board, wherein the circuit board is provided with a through hole communicating with the front and back of the circuit board. Therefore, the front side of the circuit board is provided by providing a through-hole that communicates the front and back of the circuit board with the space inside the case that is easily divided by the circuit board housed in the case (upper case and lower case). A ventilation path connecting the back side can be formed, which allows moisture or heat that tends to accumulate inside the case to be exhausted through the through-hole, and the air fluidity inside the case is increased compared to the conventional case. Therefore, the fogging phenomenon can be avoided in advance, whereby the initial purpose can be achieved.

FIG. 1 is a front view showing a display device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the main part of the location along the line AA in FIG. FIG. 3 is a cross-sectional view showing a display device according to the second embodiment of the present invention.

  A detailed description will be given of a display device in which a display device such as an indicating instrument mounted on a motorcycle is housed in a case as an example of a ventilation device structure that is an object of the present invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 and FIG. 2 show a first embodiment of the present invention. As a meter (display device) mounted on a motorcycle or the like, for example, a first display 1 for instructing the engine rotation of a vehicle, vehicle speed and traveling From the second display 2 that displays various travel information such as distance and fuel amount, the circuit board 3 disposed behind these displays 1 and 2, and the back cover that covers the back side of the circuit board 3 A lower case 4 and an upper case 5 provided with a transparent cover 5A that covers the front side of the displays 1 and 2 and at least displays the display area of the displays 1 and 2.

  Further, the first indicator 1 includes a pointer 13 that indicates corresponding to an indicator portion 12 such as a scale provided on the display board 11, and a movable magnet type instrument that drives the pointer 13 according to the engine speed. Alternatively, it has an instrument main body 14 formed of a stepping motor or the like. A light guide member 15 is provided behind the display plate 11, and a light source 16 is disposed at a light receiving portion of the light guide member 15.

  The second display 2 is composed of a display having a segment type liquid crystal panel 21 for digitally displaying the various traveling information described above, and the first display 1 together with the second display 2 is a circuit board. 3 is arranged.

  A drive circuit (not shown) for driving the respective indicators 1 and 2 is mounted on the circuit board 3, and the light guide member 15 is provided in addition to the first and second indicators 1 and 2. A light source 16 for transmitting and illuminating the indicator portion 12 provided on the display panel 11 and a light source 22 for transmitting and illuminating the liquid crystal panel 21 are disposed behind the liquid crystal panel 21.

  The lower case 4 is opened to the front so as to mainly cover the back side of each of the indicators 1 and 2, is formed of an opaque synthetic resin, and has a side wall portion 41 surrounding each of the indicators 1 and 2. And a bottom wall portion 42 that covers the back side of each of the indicators 1 and 2, and a predetermined portion of the bottom wall portion 42 communicates the inside (inside air) and the outside (outside air) of the lower case 4. A plurality of ventilation portions 43 having ventilation holes 43A are formed.

  Each of the vent holes 43A communicates the inside of the case (the upper case 5 and the lower case 4) with the outside, and the cross-sectional shape is a labyrinth to prevent entry of dust, dust, water droplets, etc. Is formed.

  Moreover, although the ventilation hole 43A location of each ventilation | gas_flowing part 43 located in the inner surface side of the lower case 4 is covered with the waterproof film F which has air permeability, although air permeability is required, it is dustproof or In a specification condition that does not require much consideration for waterproofness, such a waterproof film F may not be attached to the vent hole 43A.

  As described above, in the present embodiment, the space S and the case (the upper case 5 and the lower case) formed by the upper case 5 and the lower case 4 are provided at appropriate positions of the bottom wall portion 42 of the lower case 4. 4), a ventilation portion 43 having a ventilation hole 43A for communicating with the outside side is provided. The circuit board 3 side corresponding to the position of the ventilation portion 43 is communicated with the front and back of the circuit board 3. A through hole 31 is provided.

  In this case, it is desirable that the inner dimension of the through hole 31 is larger than the inner diameter dimension of the vent hole 43A of the vent portion 43 because air fluidity can be improved.

  Each display 1 and 2 is supported by a housing 6 that also serves as a spacer in order to ensure a predetermined distance from the circuit board 3 side.

  As described above, according to the first embodiment, the displays 1 and 2, the circuit board 3 on which the drive circuit for driving the displays 1 and 2 is mounted, the circuit board 3 and the displays 1 and 2. 2, an upper case 5 provided with a see-through see-through panel 5 </ b> A disposed in the front opening of the lower case 4 and covering the indicators 1 and 2 in a sealed state, and the lower case 4 and a ventilation portion 43 having a ventilation hole 43 </ b> A that communicates the space portion S constituted by the upper case 5 and the lower case 4 and the outside of the lower case 4. The circuit board 3 is provided with a through-hole 31 that communicates the front and back of the circuit board 3 so that the circuit board 3 is easily separated by the circuit board 3 housed in the case (the upper case 5 and the lower case 4). Space part S of the circuit board 3 By providing the (through) through-hole 31, it is possible to form a ventilation path that connects the front side and the back side of the circuit board 3, thereby allowing moisture, heat, and the like that easily collect in the case to pass through the through-hole 31. The air can be exhausted from the vent hole 43A, the fluidity of the air inside the case can be increased as compared with the conventional case, and the clouding phenomenon can be avoided in advance.

  In the present embodiment, the through hole 31 is provided at a position corresponding to the position of the vent hole 43A, so that the vent hole 43A provided in the lower case 4 and the through hole 31 provided in the circuit board 3 are provided. By adjusting the arrangement position to be substantially coaxial, air flow between the inside and outside of the case can be performed smoothly, and thereby heat and moisture in the case can be discharged. In the present embodiment, the ventilation holes 43A located on the inner surface side of the lower case 4 are covered with a waterproof film F having air permeability, thereby ensuring air permeability and being dustproof or waterproof. The property can be maintained well.

  FIG. 3 shows a second embodiment of the present invention, which is formed in substantially the same manner as the first embodiment shown in FIGS. 1 and 2 described above. In the second embodiment, in the same manner as in the first embodiment described above, the indicators 1 and 2 are housed in a case composed of the upper case 5 and the lower case 4, and two sheets are provided. A plurality of circuit boards 3 </ b> A and 3 </ b> B are stored with a predetermined interval.

  Further, a space S formed by the upper case 5 and the lower case 4 and the case (upper case 5) are provided at appropriate positions on the bottom wall portion 42 of the lower case 4 in substantially the same manner as in the first embodiment described above. And a plurality of ventilation portions 43 having ventilation holes 43A for communicating with the outside of the lower case 4).

  At this time, the circuit board 3 </ b> B disposed on the side close to the lower case 4 is provided with a through hole 31 for communicating the front and back of the circuit board 3 at a position corresponding to the position of the ventilation portion 43.

  The two circuit boards 3A and 3B are provided so as to be stacked and arranged at a predetermined interval while being positioned by a boss portion 6A provided on the housing 6 also serving as a spacer. In this case, it is fastened and fixed together with the lower case 4 by a screw b serving as a fixing member.

  In the second embodiment, in the circuit boards 3A and 3B composed of a plurality (two in this embodiment) arranged in a stacked manner, the through hole 31 is provided only in the circuit board 3B located on the side close to the lower case side. However, the through hole 31 may be provided in the circuit board 3A located on the different side of the upper case, and at this time, the through hole 31 provided in the circuit board 3B is arranged side by side coaxially. Or by providing the circuit board 3A with the through holes 31 so as to be alternated with the through holes 31 provided in the circuit board 3B, it is possible to enhance the ventilation effect, and to prevent the clouding phenomenon or the like in advance. It can be avoided.

  As described above, according to the second embodiment, the circuit board 3A and the circuit board 3B are arranged in a stacked state, and by providing the through hole 31 in the circuit board 3B located at least on the lower case 4 side, In the laminated circuit boards 3A and 3B, the case (upper case) is connected via the vent hole 43A provided in the lower case 4 and the through hole 31 provided in the circuit board 3B located on the lower case 4 side. 5 and the lower case 4), the air flow between the inner side and the outer side can be smoothly performed, and the outside is transferred to the circuit board 3A side located on the inner side of the case by the through hole 31 provided in the circuit board 3B. As a result, it becomes possible to exhaust moisture, heat, etc., which tends to accumulate on the upper case 5 side, through the through-hole 31 as a result. compared Can be increased, it is possible to prevent fogging phenomenon of perspective cover 5A.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in each embodiment, on the circuit board 3, 3 B side corresponding to the position of the ventilation part 43 having the ventilation hole 43 A provided at an appropriate position of the bottom wall part 42 of the lower case 4, the circuit board 3 Although the through holes 31 for communicating the front and back of 3B are provided, the number of the through holes 31 is provided in the circuit boards 3 and 3B more than the number of the ventilation portions 43 without matching the number of the ventilation portions 43 by the ventilation holes 43A. By configuring, the air passage on the inner side of the case can be formed, so exhaust is performed through the through-hole 31 provided with a plurality of moisture, heat, and the like that easily accumulate in the internal space of the case (upper case and lower case). This makes it possible to further improve the fluidity of the air inside the case.

  Further, as described in detail in the above-described embodiment, the display device in the motorcycle has been described as an example. However, the display device is not limited to the vehicle, but may be applied to a display device for a ship instrument, an agricultural machine, a construction machine, or the like. Can be obtained, and similar effects can be obtained.

DESCRIPTION OF SYMBOLS 1 1st indicator 2 2nd indicator 3, 3A, 3B Circuit board 4 Lower case 5 Upper case 5A Perspective cover 6 Housing 6A Boss part 11 Display board 12 Indicator part 13 Pointer 14 Instrument main body 15 Light guide member 16 , 22 Light source 21 Liquid crystal panel 31 Through hole 41 Side wall portion 42 Bottom wall portion 43 Ventilation portion 43A Ventilation hole b Screw F Waterproof film S Space portion

Claims (3)

  A display device, a circuit board on which a drive circuit for driving the display device is mounted, a lower case housing the circuit board and the display device, and a front opening of the lower case; An upper case provided with a see-through see-through panel that covers the display in a sealed state, a space provided in the lower case, and constituted by the upper case and the lower case, and an outer side of the lower case; A display device comprising a ventilation portion having a ventilation hole that communicates with the circuit board, wherein the circuit board is provided with a through hole that communicates the front and back of the circuit board.   The display device according to claim 1, wherein the through hole is provided at a location corresponding to the position of the ventilation portion provided in the lower case. The circuit board, wherein the first circuit board and the second circuit board are disposed in a stacked state, and the through hole is provided in the circuit board located on the lower case side. Item 3. A display device according to item 1 or item 2.

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