JP2011254201A - Housing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage of a thin film member arranged so as to block a continuous hole formed on a case.SOLUTION: The entire thin film member 31 and a part of a plate portion 11 is covered by a shield plate 14. A passage 15 is formed between the plate portion 11 and the thin film member 31 and the shield plate 14, and the passage 15 is in communication with an outer space through multiple openings 16. The openings 16 are formed in areas of the shield plate 14, which do not face the plate portion 11 and the thin film member 31, and open in different directions.

Description

  The present invention relates to a housing structure in which a thin film member is disposed in a communication hole of a case, and is suitable for a housing structure such as a vehicle alarm device or a vehicle approach notification device.

  As shown in FIG. 3, in the conventional vehicle alarm device, a diaphragm 52 made of cone paper is disposed so as to close the communication hole 51 formed in the case 50, and a cover 53 is provided on the outer space side of the diaphragm 52. And a large number of sound emitting holes 54 are formed in a portion of the cover 53 facing the diaphragm 52.

  Moreover, this alarm device is mounted in the front bumper of a vehicle, for example. Therefore, there is a possibility that the diaphragm 52 which is a thin film member is damaged when the water flow passes through the sound emission holes 54 and directly collides with the diaphragm 52 during high-pressure car washing. Therefore, a baffle plate 55 that receives a water flow from the sound emitting hole 54 toward the diaphragm 52 is provided on the cover 53. And since the water flow which flows in the penetration direction of the communicating hole 51 as shown by the arrow A collides with the baffle plate 55 and is bounced back, damage to the diaphragm 52 is prevented.

  However, in the conventional alarm device, the baffle plate 55 does not act effectively on the water flow flowing obliquely with respect to the direction of penetration of the communication hole 51 as indicated by the arrow B, and the water flow directly collides with the vibration plate 52. Therefore, there is a problem that the diaphragm 52 is damaged by water pressure.

  Further, in the conventional alarm device, since all the sound emitting holes 54 are opened in the same direction, a situation in which all the sound emitting holes 54 are blocked by the water flow is likely to occur. There is a problem that the air in the space between the plate 52 and the cover 53 is compressed by the water flow to increase the atmospheric pressure in the space, and the increased pressure causes the diaphragm 52 to be damaged.

  Furthermore, in an electronic device having a circuit board therein, a device in which a communication hole as a breathing hole formed in a case is covered with a thin film member made of a fiber having waterproofness and air permeability is known. Even in such an electronic device, there was a problem that the thin film member was damaged by the water flow.

  An object of this invention is to prevent the failure | damage of the thin film member arrange | positioned so that the communicating hole formed in the case may be plugged up in view of the said point.

  In order to achieve the above object, in the invention described in claim 1, a communication hole (13) penetrating the plate portion (11) is formed in the plate portion (11) of the case (1), and the communication hole (13 ), The passage (15) is formed between the plate portion (11) and the thin film member (31) so that the plate portion (11) and the thin film member (31) are disposed. A shielding plate (14) covering the external space side of the thin film member (31) is provided, and the passage (15) is connected to the external space via a plurality of openings (16), and the opening (16) is shielded. It forms in the site | part which does not oppose the board part (11) and thin film member (31) in a board (14), and it is opening toward different directions, It is characterized by the above-mentioned.

  According to this, since the plate part (11) and the thin film member (31) are covered with the shielding plate (14), the water flow flowing in the through-hole of the communication hole (13) collides with the shielding plate (14). Of the water flow that is rebounded and flows obliquely with respect to the direction of penetration of the communication hole (13), the water flow toward the shielding plate (14) collides with the shielding plate (14) and is rebounded. Of the water flow that flows obliquely with respect to the through direction of the communication hole (13), the water flow toward the opening (16) and the direction substantially perpendicular to the through direction of the communication hole (13) (that is, the communication hole (13 The water flow flowing in the plate portion (11) formed in parallel) flows into the passage (15) from the opening portion (16) and then flows along the plate portion (11). Therefore, it is avoided that the water flow directly collides with the thin film member (31), and the thin film member (31) is prevented from being damaged.

  Furthermore, since the plurality of openings (16) have different opening directions, it is difficult for all the openings (16) to be blocked by the water flow. Therefore, an increase in atmospheric pressure in the passage (15) is avoided, and damage to the thin film member (31) is prevented.

  According to a third aspect of the present invention, the housing structure according to the first or second aspect includes two openings (16), and the opening directions of the two openings (16) differ by 180 degrees. And

  According to this, one of the openings (16) is directed to the celestial direction, and the other opening (16) is used in a state of being directed to the ground, thereby flowing into the passage (15) from the opening (16). Water can be easily and reliably discharged into the external space.

  In invention of Claim 4, in the housing | casing structure as described in any one of Claim 1 thru | or 3, in the surface facing the board part (11) and thin film member (31) in a shielding board (14), Concavities and convexities (17) are formed.

  According to this, since water hardly adheres to the surface on which the unevenness (17) is formed, it is difficult for water to stay in the passage (15), and the water flowing into the passage (15) is easily discharged to the external space. Become.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(A) is a front view of an alarm device employing a housing structure according to an embodiment of the present invention, (b) is a plan view of (a), and (c) is a right side view of (a). It is sectional drawing which follows the CC line of the 1st case single-piece | unit of Fig.1 (a). It is sectional drawing which shows the structure of the principal part of the conventional alarm device.

  An embodiment of the present invention will be described. FIG. 1A is a front view of an alarm device that employs a housing structure according to an embodiment, FIG. 1B is a plan view of FIG. 1A, and FIG. 1C is a plan view of FIG. It is a right view. FIG. 2 is a cross-sectional view taken along the line C-C of the first case alone in FIG. In addition, the top-and-bottom direction shown in FIG. 1 and FIG. 2 has shown the direction in the state which mounted | wore the vehicle with the alarm device.

  This alarm device emits a pseudo engine sound to inform a pedestrian or the like that a vehicle is approaching when driving at a low speed in a low noise vehicle such as a hybrid vehicle or an electric vehicle. For example, in the front bumper Installed.

  As shown in FIGS. 1 and 2, the alarm device includes a housing made up of a first case 1 made of resin and a second case 2 made of resin. The first case 1 has a substantially flat plate shape, the second case 2 is a substantially rectangular parallelepiped box with one side opened, and the first case 1 is airtightly fitted into the opening of the second case 2 so that A space is formed inside the.

  The second case 2 has a plurality of bracket mounting portions 21 formed on the outer wall surface thereof, and the bracket attached to the front bumper is inserted into the hole of the bracket mounting portion 21 so that the alarm device is fixed to the front bumper. It has become so.

  A speaker 3 and a substrate 4 are fixed to the first case 1, and the speaker 3 and the substrate 4 are arranged in an internal space formed by the first case 1 and the second case 2.

  A control circuit is mounted on the board 4, and the control circuit determines whether or not the automobile is traveling at a low speed (for example, 20 km / h or less) based on a signal from the vehicle speed sensor. For example, an electric signal is output to the speaker 3.

  The speaker 3 includes a diaphragm 31 made of cone paper and a voice coil 32 in which a coil is wound around a magnet. When the automobile is traveling at a low speed, an electric signal from the control circuit is output to the voice coil 32 via the lead wire 33, and the voice coil 32 vibrates the diaphragm 31 based on the electric signal to generate a sound. It is like that. The diaphragm 31 corresponds to the thin film member of the present invention.

  The first case 1 includes a plate portion 11 that is fitted into the opening of the second case 2 and closes the opening. A connector 12 is formed on the external space side of the plate portion 11, and a plurality of terminals are arranged in the connector 12, and the terminals are connected to the substrate 4.

  A circular communication hole 13 that passes through the plate portion 11 is formed in the plate portion 11 of the first case 1. An outer peripheral portion of the diaphragm 31 is attached to a portion of the plate portion 11 surrounding the communication hole 13 with an adhesive, and the communication hole 13 is closed by the diaphragm 31.

  A shielding plate 14 that covers the outer space side of the plate portion 11 and the diaphragm 31 is formed on the outer space side of the plate portion 11. More specifically, when viewed along the penetrating direction of the communication hole 13 (that is, when the alarm is viewed from the front as shown in FIG. 1A), the shielding plate 14 covers the entire area of the diaphragm 31 and the plate. Part of the part 11 is covered.

  A flat passage 15 is formed between the plate portion 11 and the diaphragm 31 and the shielding plate 14, and this passage 15 is connected to the external space through two openings 16 as sound emitting holes. Yes.

  The opening 16 is formed in a portion of the shielding plate 14 that does not face the plate 11 and the diaphragm 31 and opens in different directions. More specifically, one of the two openings 16 opens toward the top, and the other opening opens toward the ground. In other words, the opening directions of the two openings 16 are different by 180 degrees.

  On the surface of the shielding plate 14 facing the plate portion 11 and the vibration plate 31, wave-shaped irregularities 17 are formed. The unevenness 17 extends from one opening 16 to the other opening 16, and in this example extends in the vertical direction.

  In the alarm device having the above-described configuration, when the automobile is traveling at a low speed, the diaphragm 31 vibrates based on an electric signal from the control circuit to generate a sound, and the sound passes through the passage 15 to generate two openings. 16 is emitted to the external space.

  In the alarm device of the present embodiment, since the entire region of the diaphragm 31 and a part of the plate portion 11 are covered with the shielding plate 14, for example, when water is applied during high-pressure car washing, the communication hole 13 as indicated by an arrow A. The water flow flowing in the through direction of the water collides with the shielding plate 14 and is bounced back, and the water flow toward the shielding plate 14 out of the water flow flowing obliquely with respect to the through direction of the communication hole 13 as shown by the arrow B collides with the shielding plate 14. Bounced back. Further, among the water flows flowing obliquely with respect to the penetrating direction of the communication hole 13 as indicated by the arrow B, the water flow toward the opening 16 and the direction substantially perpendicular to the penetrating direction of the communication hole 13 as indicated by the arrow D (that is, The water flow flowing in parallel with the plate portion 11 flows along the plate portion 11 after flowing into the passage 15 from the opening portion 16. Therefore, the water flow is prevented from directly colliding with the diaphragm 31, and the diaphragm 31 is prevented from being damaged.

  In addition, since the two openings 16 are opened in different directions, it is difficult for the two openings 16 to be simultaneously closed by the water flow. Therefore, an increase in atmospheric pressure in the passage 15 is avoided, and damage to the diaphragm 31 is prevented.

  Furthermore, by using one opening 16 facing the sky and the other opening 16 facing the ground, the water flowing into the passage 15 from the opening 16 can be easily and reliably discharged to the external space. Can be made.

  Furthermore, since water hardly adheres to the surface on which the unevenness 17 is formed, the water does not easily stay in the passage 15 and the water that has flowed into the passage 15 is easily discharged to the external space.

(Other embodiments)
In the above embodiment, two openings 16 are provided, but three or more openings 16 that open in different directions may be provided in portions of the shielding plate 14 that do not face the plate 11 and the diaphragm 31. Good. According to this, the opening area of each opening part 16 can be made small, and the penetration | invasion of the water to the channel | path 15 can be suppressed.

  In the above embodiment, the case structure of the present invention is applied to an alarm device. For example, a circuit board is provided inside a case, and a communication hole as a breathing hole formed in the case is made waterproof and breathable. The housing structure of the present invention can also be applied to an electronic device covered with a thin film member made of fibers.

DESCRIPTION OF SYMBOLS 1 Case 11 Plate part 13 Communication hole 14 Shielding plate 15 Passage 16 Opening part 31 Diaphragm (thin film member)

Claims (6)

The casing (1) is provided with a communication hole (13) passing through the plate part (11) in the plate part (11), and the thin film member (31) is disposed so as to close the communication hole (13). In the body structure,
A shielding plate (14) that forms a passage (15) between the plate portion (11) and the thin film member (31) and covers the external space side of the plate portion (11) and the thin film member (31). With
The passage (15) is connected to the external space through a plurality of openings (16),
The opening (16) is formed in a portion of the shielding plate (14) that does not face the plate portion (11) and the thin film member (31), and opens in a different direction. The housing structure.   The shielding plate (14) covers the entire area of the thin film member (31) and a part of the plate portion (11) when viewed along the penetration direction of the communication hole (13). The housing structure according to claim 1.   The housing structure according to claim 1 or 2, wherein two opening portions (16) are provided, and the opening directions of the two opening portions (16) are different by 180 degrees.   4. The unevenness (17) is formed on a surface of the shielding plate (14) facing the plate portion (11) and the thin film member (31). The housing structure described in 1.   The casing structure according to any one of claims 1 to 4, wherein the thin film member (31) is a diaphragm for generating sound.   The casing structure according to any one of claims 1 to 4, wherein the thin film member (31) is made of a fiber having waterproofness and air permeability.

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