Vehicle display device

Abstract

To provide a display device for a vehicle capable of suppressing generation of abnormal noise due to interference of respective parts with sound generation of a sound generation part.SOLUTION: A display device 1 for a vehicle includes a circuit board 30, a sound generation part 40, and a case 50. The case 50 includes: a box part 51 opened toward the circuit board 30; and a step part 54 projecting from an opening end 51a of the box part 51 toward an outer side of the box part 51. The step part 54 includes: a side wall part 55 opposing to a side surface 33 of the circuit board 30 at an interval; and a connection part 56 for connecting a rear end of the side wall part 55 to the opening end 51a and formed along a rear surface 32 of the circuit board 30. In the connection part 56, a rib in contact with an outer edge 32a of the rear surface 32 is formed and an opposing surface to be opposed to the outer edge 32a of the rear surface 32 at an interval is formed at a position different from the rib. A sound generation part 40 is supported by the box part 51 or positioned inside the box part 51.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a vehicle display device including a sound generating unit. [Background technology]

[0002] For example, Patent Document 1 describes a vehicle display device that includes a speaker as a sound generating unit. The device described in Patent Document 1 includes a speaker fixed to a case (a casing in the document) with a screw, a support ring provided on the case and in contact with the speaker, a circuit board that is electrically connected to the speaker, and a lower cover that supports the circuit board and is connected to the case (see FIG. 1 in the document). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-88609 Summary of the Invention [Problem to be solved by the invention]

[0004] The device described in Patent Document 1 attempts to suppress the generation of abnormal noise caused by the speaker by using the elastic force of the support ring to suppress the vibrations transmitted from the speaker to the case. However, this device does not have a structure to prevent the vibrations transmitted to the case from being transmitted to various parts such as the lower cover and circuit board.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a vehicle display device that can suppress the generation of abnormal noise caused by interference between various parts when a sound generating unit produces sound. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure The first perspective The vehicle display device according to the present invention is a display unit that displays information about the vehicle; a circuit board located behind the display unit; a sound generating unit located behind the circuit board and emitting sound; a case that houses the circuit board, The case is a box portion located behind the circuit board and opening toward the circuit board; a step portion that protrudes from the open end of the box portion toward the outside of the box portion, The step portion is a side wall portion facing a side surface of the circuit board with a gap therebetween; a connection portion that connects a rear end of the side wall portion and the opening end and is formed along the rear surface of the circuit board, The connecting portion has a rib that comes into contact with the outer edge of the back surface, and an opposing surface that faces the outer edge of the back surface with a gap at a position different from the rib, The gap is 2 mm or less, The sound generating unit is supported by or located within the box. In order to achieve the above object, a vehicle display device according to a second aspect of the present disclosure includes: a display unit that displays information about the vehicle; a circuit board located behind the display unit; a sound generating unit located behind the circuit board and emitting sound; a case that houses the circuit board, The case is a box portion located behind the circuit board and opening toward the circuit board; a step portion that protrudes from the open end of the box portion toward the outside of the box portion, The step portion is a side wall portion facing a side surface of the circuit board with a gap therebetween; a connection portion that connects a rear end of the side wall portion and the opening end and is formed along the rear surface of the circuit board, The connecting portion has a rib that comes into contact with the outer edge of the back surface, and an opposing surface that faces the outer edge of the back surface with a gap at a position different from the rib, the open end of the box portion is along the outer edge of the back surface, The sound generating unit is supported by or located within the box.

[0007] The ribs are plural, The total area of ​​the opposing surfaces may be greater than the total area of ​​the portions of the ribs that contact the outer edge of the back surface.

[0008] The step portion is formed around the entire periphery of the box portion. This may be done.

[0009] The box portion is a bottom plate having a bottom surface facing the back surface with a gap therebetween; a side plate extending from an outer edge of the bottom plate toward the circuit board, the opening end is a portion surrounded by the front end of the side plate, The area of ​​the bottom surface may be smaller than the area of ​​the back surface.

[0010] The sound generating unit may be a speaker and may be supported by the bottom plate. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to suppress the generation of abnormal noise due to interference between various parts that accompanies the sound produced by the sound generating unit. [Brief explanation of the drawings]

[0012] [Figure 1] 3 is a schematic cross-sectional view of the vehicle display device according to the embodiment of the present disclosure taken along line AA shown in FIG. 2. [Figure 2] FIG. [Figure 3] An enlarged view of part B shown in Figure 1. [Figure 4] 3 is a partial cross-sectional view of the vehicle display device taken along line CC shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present disclosure will be described with reference to the drawings.

[0014] 1 is mounted on a vehicle such as a four-wheeled motor vehicle or a two-wheeled motor vehicle, and displays information about the vehicle. The vehicle display device 1 is incorporated, for example, into the dashboard of the vehicle. The vehicle display device 1 is configured as an instrument that notifies the user of, for example, vehicle speed, engine RPM, remaining battery power, etc.

[0015] 1 shows a forward direction Fd, which is the direction of the user (toward a display unit 10 described later), and a backward direction Bd, which is the opposite direction, relative to the vehicle display device 1. The forward and backward directions used in the following description will follow this.

[0016] The vehicle display device 1 includes a display unit 10, a front cover 20, a circuit board 30, a sound generating unit 40, and a case 50.

[0017] The display unit 10 displays information about the vehicle. The display unit 10 is, for example, an image display device such as a liquid crystal display or an organic EL (Electro-Luminescence) display. The display unit 10 is electrically connected to the circuit board 30. The display unit 10 may be an analog meter having a pointer and an indicator indicated by the pointer. The display unit 10 may also include both an image display device and an analog meter.

[0018] The front cover 20 is located in front of the display unit 10 and includes a cover glass 21 and a frame body 22. The cover glass 21 allows a user to see information displayed on the display unit 10 through the cover glass 21. The frame body 22 supports the cover glass 21 at its front end and is connected to the case 50 at its rear end. The frame body 22 is formed, for example, from a resin having light-blocking properties.

[0019] The circuit board 30 is, for example, a PCB (Printed Circuit Board), and is configured by forming various wiring patterns on an insulating substrate. The display unit 10 and the sound generating unit 40 are each electrically connected to the circuit board 30 by wiring (not shown). A control unit such as a microcontroller that controls the operation of each of the display unit 10 and the sound generating unit 40 is mounted on the circuit board 30. In addition, a connector (not shown) is mounted on the circuit board 30 for electrically connecting to an external device.

[0020] The circuit board 30 has a front surface 31 facing the display unit 10, a back surface 32 located behind the front surface 31, and side surfaces 33. As shown by the dashed line in Fig. 2, the circuit board 30 has a horizontally long rectangular shape in a plan view. Note that Fig. 2 shows the outline (side surfaces 33) of the circuit board 30 relative to the case 50 by the dashed line.

[0021] As shown in FIG. 2, the side surfaces 33 of the circuit board 30 include first to fourth side surfaces 33a to 33d. Specifically, the first side surface 33a and the second side surface 33b are located at positions corresponding to the long sides of the rectangle. The first side surface 33a is located higher than the second side surface 33b in FIG. 2. The third side surface 33c and the fourth side surface 33d are located at positions corresponding to the short sides of the rectangle. The third side surface 33c is located to the left of the fourth side surface 33d in FIG. 2.

[0022] The sound generating unit 40 is a speaker in this embodiment, and generates sound under the control of the control unit. The sound generating unit 40 is located behind the circuit board 30, and in this embodiment, is supported by a case 50 as described below.

[0023] The vehicular display device 1 mainly emits sound rearward from the sound generating unit 40. The sound emitted from the vehicular display device 1 reaches the user via the space within the dashboard. As shown in FIG. 1 , if a sound wave traveling rearward from the speaker is designated as a first sound wave S1, a second sound wave S2 of opposite polarity to the first sound wave S1 is generated in the opposite direction due to the characteristics of the speaker's diaphragm. If the first sound wave S1 is in positive phase, the second sound wave S2 is out of phase. When the second sound wave S2 emitted into the case 50 reaches the user, some of the frequency bands cancel out the first sound wave S1, which is intended to reach the user, and the desired sound pressure may not be maintained. In this embodiment, the structural features of the case 50, which will be described next, suppress a decrease in sound pressure and the generation of abnormal sounds due to vibrations of various parts.

[0024] The case 50 houses the circuit board 30 and the display unit 10. The display unit 10 is supported by, for example, an inner case (not shown) that is disposed within the case 50.

[0025] The case 50 has a box portion 51 and a step portion 54. For example, the case 50 is formed from a resin having light-blocking properties. For example, the box portion 51 and the step portion 54 are integrally formed from the resin.

[0026] The box portion 51 is located behind the circuit board 30 and opens toward the circuit board 30. Specifically, the box portion 51 has a bottom plate 52 and side plates 53.

[0027] As shown in FIG. 1 , the bottom plate 52 has a bottom surface 52a that faces the rear surface 32 of the circuit board 30 with a gap therebetween. The area of ​​the bottom surface 52a is smaller than the area of ​​the rear surface 32. As shown in FIG. 2 , the bottom plate 52 is formed with a mounting hole H1 to which the sound generating unit 40 is attached and an exposure hole H2 through which a connector (not shown) mounted on the rear surface 32 is exposed. The mounting hole H1 is formed, for example, in a circular shape. The sound generating unit 40 is fitted into the mounting hole H1 and fixed to the bottom plate 52 around the mounting hole H1 by screws or the like. Note that a buffer material (not shown) may be provided between the sound generating unit 40 and the bottom plate 52. The sound generating unit 40, which is a speaker, is attached to the bottom plate 52 with its cone facing backward. In this manner, the sound generating unit 40 is supported by the bottom plate 52 of the box portion 51. The exposure hole H2 is formed in a rectangular shape to match the outer shape of the connector (not shown).

[0028] As shown in FIG. 1, the side plates 53 extend from the outer edge of the bottom plate 52 toward the circuit board 30. As shown in FIG. 2, the side plates 53 include first to fourth side plates 53a to 53d. The first side plate 53a extends along the first side surface 33a, the second side plate 53b extends along the second side surface 33b, the third side plate 53c extends along the third side surface 33c, and the fourth side plate 53d extends along the fourth side surface 33d. Specifically, the first side plate 53a, the third side plate 53c, and the fourth side plate 53d are approximately perpendicular (including exactly perpendicular) to the bottom surface 52a. As shown in FIG. 1, the angle between the inner surface of the second side plate 53b and the bottom surface 52a is an obtuse angle, and the second side plate 53b extends obliquely from the bottom plate 52.

[0029] 1 and 2, the side plates 53 are located in an area inside the outer periphery of the circuit board 30. The area surrounded by the front ends of the first to fourth side plates 53a to 53d is the opening edge 51a of the box portion 51. The opening area of ​​the box portion 51 (the area of ​​the area surrounded by the opening edge 51a) is smaller than the area of ​​the back surface 32 of the circuit board 30.

[0030] The step portion 54 is a stepped portion that protrudes from the open end 51a of the box portion 51 toward the outside of the box portion 51. Specifically, the step portion 54 has a side wall portion 55 and a connection portion 56. The step portion 54 of this embodiment is formed around the entire periphery of the box portion 51.

[0031] The side wall portion 55 surrounds the circuit board 30 and faces the side surface 33 of the circuit board 30 with a gap therebetween. As shown in FIG. 2, the side wall portion 55 includes first to fourth side wall portions 55a to 55d. The first side wall portion 55a faces the first side surface 33a, the second side wall portion 55b faces the second side surface 33b, the third side wall portion 55c faces the third side surface 33c, and the fourth side wall portion 55d faces the fourth side surface 33d. The front ends of the side wall portions 55 are connected to the frame body 22, whereby the case 50 is connected to the front cover 20.

[0032] As shown in FIG. 1, the connection portion 56 connects the rear end of the side wall portion 55 to the open end 51 a of the box portion 51 and is formed along the rear surface 32 of the circuit board 30 .

[0033] 3 is an enlarged view of a portion B shown in FIG. 1. FIG. 4 is a partial cross-sectional view of the vehicle display device 1 taken along line CC shown in FIG. 2. The connecting portion 56 is formed with an opposing surface 560 shown in FIG. 3 and a rib 57 shown in FIG. 4. As will be described later, the connecting portion 56 of this embodiment is formed with first to tenth ribs 57a to 57j as the ribs 57, but the functions of the ribs 57 and the opposing surface 560 are the same. Therefore, the ribs 57 and the opposing surface 560 will be described below with reference to FIGS. 3 and 4, focusing on the relationship between the first rib 57a and the opposing surface 560.

[0034] 4, the connecting portion 56 is formed with a rib 57 (first rib 57a) that comes into contact with the outer edge 32a of the rear surface 32 of the circuit board 30. Furthermore, as shown in Fig. 3, the connecting portion 56 is formed with an opposing surface 560 that faces the outer edge 32a of the rear surface 32 with a gap G therebetween at a position different from the rib 57.

[0035] The gap G is set to a value that is as small as possible so that the opposing surface 560 does not come into contact with the rear surface 32 of the circuit board 30 even if the circuit board 30 and the case 50 are deformed due to vibration, heat, etc. For example, the gap G is preferably 2 mm or less.

[0036] There are a plurality of ribs 57, and in this embodiment, first to tenth ribs 57a to 57j are provided as shown in FIG. 2. In FIG. 2, the colored portions of the first to tenth ribs 57a to 57j indicate examples of portions that come into contact with the circuit board 30 (specifically, the outer edge 32a of the back surface 32). Each of these ribs 57 is composed of a part of a boss formed on the connecting portion 56, a dedicated rib for supporting the back surface 32, or the like. The boss formed on the connecting portion 56 may be (i) a boss having a protrusion for determining the position of the circuit board 30 relative to the case 50, or (ii) a boss having a screw hole for screwing the circuit board 30 to the case 50. A notch is formed in the circuit board 30 to avoid the protrusion or screw hole provided on each boss.

[0037] As can be seen with reference to FIG. 2 , the total area of ​​the facing surface 560 is larger than the total area of ​​the portions where the ribs 57 contact the circuit board 30 (specifically, the outer edge 32a of the back surface 32). In other words, the case 50 partially supports the circuit board 30 by the ribs 57 formed on the connecting portion 56. Here, if the circuit board 30 were supported over a wide area by abutting against the facing surface 560, vibrations of the case 50 generated in association with sound generation by the sound generating unit 40 would be easily transmitted to the circuit board 30. However, in this embodiment, the circuit board 30 is supported over a small area by the ribs 57, so that transmission of the vibrations to the circuit board 30 can be suppressed. Therefore, the generation of abnormal noise due to interference between the case 50, the circuit board 30, etc. can be suppressed.

[0038] Furthermore, the gap G between the opposing surface 560 of the case 50 and the circuit board 30 is set to a small value, for example, 2 mm or less. This prevents the second sound waves S2 generated inside the case 50 from passing through to the front surface 31 of the circuit board 30. This reduces the amount of second sound waves S2 reaching the user, preventing the second sound waves S2 from canceling out the first sound waves S1 that are intended to reach the user. As a result, the above-described vehicle display device 1 can prevent a decrease in the sound pressure level from the sound generating unit 40.

[0039] Furthermore, according to the vehicle display device 1, the step portion 54 is provided in the case 50, which increases the rigidity of the case 50. This makes it possible to suppress vibrations of the case 50 that occur when the sound generating unit 40 produces sound.

[0040] Furthermore, in the vehicle display device 1, (i) the opening area of ​​the box portion 51 (the area of ​​the region surrounded by the opening edge 51a) is smaller than the area of ​​the rear surface 32 of the circuit board 30, and (ii) the area of ​​the bottom surface 52a is smaller than the area of ​​the rear surface 32. This allows the box portion 51 of the case 50 to be made smaller, resulting in a compact configuration of the vehicle display device 1. Furthermore, since the internal space of the box portion 51 of the case 50 can be made smaller, it is possible to ensure a relative amount of emission of the first sound wave S1 relative to the second sound wave S2, and as a result, it is thought that a decrease in the sound pressure level from the sound generating unit 40 can be suppressed.

[0041] The present invention is not limited to the above-described embodiments and drawings, and may be modified as appropriate (including the omission of components).

[0042] (Variation) Although the above describes an example in which the sound generating unit 40 is supported on the bottom plate 52 of the box portion 51, this is not limiting. For example, the sound generating unit 40 may be supported on the side plate 53 of the box portion 51. Furthermore, the sound generating unit 40 may be located inside the box portion 51, for example by being directly mounted on the back surface 32 of the circuit board 30. In this case, a plurality of sound emission holes that allow the first sound wave S1 from the sound generating unit 40 to pass through may be provided in the box portion 51 at a location facing the sound generating unit 40. Furthermore, the sound generating unit 40 is not limited to a speaker and may be a buzzer.

[0043] The shape, size, and material of the case 50 and the circuit board 30 can be changed as desired as long as the functions described above are maintained. For example, the number and shape of the ribs 57 can be changed as desired. For example, the step 54 does not have to be formed around the entire periphery of the case 50, but may be formed on only a portion of the outer periphery of the case 50. In this case, in the portion of the case 50 where the step 54 is not formed, the outer surface of the side plate 53 of the case 50 and the outer surface of the side wall 55 may be formed flush with each other.

[0044] When forming the step portion 54 on a part of the outer periphery of the case 50, it is preferable to form the step portion 54 at least in a portion closest to the sound generating unit 40. This is because it is considered that there is a high probability of abnormal noise occurring due to interference between various parts in the portion closer to the sound generating unit 40. Using the example of FIG. 2 as an example, of the side surfaces 33 of the circuit board 30, the first side surface 33a and the third side surface 33c are closest to the mounting hole H1 (i.e., the position where the sound generating unit 40 is provided). In this example, it is preferable to provide the step portion 54 at least in the portions corresponding to the first side surface 33a and the third side surface 33c.

[0045] The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the above-described embodiments are intended to illustrate the present invention and do not limit the scope of the present invention. That is, the scope of the present invention is defined by the claims, not by the embodiments. Various modifications made within the scope of the claims and the meaning of the invention equivalent thereto are considered to be within the scope of the present invention.

[0046] In the above description, in order to facilitate understanding of the present disclosure, descriptions of well-known technical matters have been omitted as appropriate. [Explanation of symbols]

[0047] 1...Vehicle display device 10…Display section 20...front cover, 21...cover glass, 22...frame 30...Circuit board 31...front, 32...back, 32a...outer edge 33...side, 33a~33d...1st~4th side 40...sound generating unit, S1...first sound wave, S2...second sound wave 50…cases 51...Box part, 51a...Open end 52... bottom plate, 52a... bottom surface, H1... mounting hole, H2... exposure hole 53...Side plate, 53a~53d...1st~4th side plate 54...Double part 55...Side wall part, 55a~55d...1st to 4th side wall part 56...Connection portion, 560...Opposite surface, G...Gap 57... Rib, 57a~57j... 1st~10th ribs

Claims

1. a display unit that displays information about the vehicle; a circuit board located behind the display unit; a sound generating unit located behind the circuit board and emitting sound; a case that houses the circuit board, The case is a box portion located behind the circuit board and opening toward the circuit board; a step portion that protrudes from the open end of the box portion toward the outside of the box portion, The step portion is a side wall portion facing a side surface of the circuit board with a gap therebetween; a connection portion that connects a rear end of the side wall portion and the opening end and is formed along the rear surface of the circuit board, The connecting portion has a rib that comes into contact with the outer edge of the back surface, and an opposing surface that faces the outer edge of the back surface with a gap at a position different from the rib, The gap is 2 mm or less, The sound generating unit is supported by or located within the box. Vehicle display device.

2. A display unit that displays information about the vehicle; a circuit board located behind the display unit; a sound generating unit located behind the circuit board and emitting sound; a case that houses the circuit board, The case is a box portion located behind the circuit board and opening toward the circuit board; a step portion that protrudes from the open end of the box portion toward the outside of the box portion, The step portion is a side wall portion facing a side surface of the circuit board with a gap therebetween; a connection portion that connects a rear end of the side wall portion and the opening end and is formed along the rear surface of the circuit board, The connecting portion has a rib that comes into contact with the outer edge of the back surface, and an opposing surface that faces the outer edge of the back surface with a gap at a position different from the rib, the open end of the box portion is along the outer edge of the back surface, The sound generating unit is supported by or located within the box. Vehicle display device.

3. The ribs are plural, The total area of ​​the opposing surfaces is greater than the total area of ​​the portions of the ribs that contact the outer edge of the back surface. The vehicle display device according to claim 1 or 2.

4. The step portion is formed around the entire circumference of the box portion. The display device for a vehicle according to any one of claims 1 to 3.

5. The box portion is a bottom plate having a bottom surface facing the back surface with a gap therebetween; a side plate extending from an outer edge of the bottom plate toward the circuit board, the opening end is a portion surrounded by the front end of the side plate, The area of ​​the bottom surface is smaller than the area of ​​the back surface. The display device for a vehicle according to any one of claims 1 to 4.

6. the sound generating unit is a speaker and is supported by the bottom plate; The vehicle display device according to claim 5 .

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