JP6249074B1 - Horn resonance tube and horn with the same - Google Patents

Abstract

An object of the present invention is to provide a horn resonance tube capable of outputting a chord having a sufficient sound pressure. SOLUTION: A first sound generated by vibration of a diaphragm 11 and having a first frequency as a fundamental frequency and a second frequency generated by vibration of the diaphragm 11 and having a relationship between the first frequency and a chord are fundamental frequencies. The main resonance tube 21 is a horn resonance tube 2 mounted on a vehicle, which resonates the first sound, and a chord including the first sound and the second sound is input to resonate the first sound. A branch resonance tube 22 that branches from the main resonance tube 21 and resonates the second sound. The main resonance tube 21 is disposed on the first surface 11a of the diaphragm 11, and the branch resonance tube 22 The first resonance surface 21a branches from the main resonance tube 21 and is disposed on the second surface 11b of the diaphragm 11 opposite to the first surface 11a. [Selection] Figure 3

Description

  The present invention relates to a resonance tube for a horn mounted on a vehicle, and a horn provided with the same.

  A vehicle is equipped with a horn that vibrates a diaphragm with a movable iron core and outputs sound generated by the diaphragm to the outside through a resonance tube. Here, the reason why the resonance tube is provided is that if the sound generated by the diaphragm is output as it is, sufficient sound pressure required for the horn cannot be obtained. Since the resonance tube has a spiral shape, there is a problem that it cannot be removed if foreign matter such as water enters and accumulates in the resonance tube. Therefore, Patent Document 1 discloses a vehicular electric horn in which a foreign object intrusion preventing member for preventing the invasion of a foreign object is attached to the sound wave outlet opening of the resonance tube, and foreign objects flying from the front of the vehicle are prevented from entering the resonance tube. Is disclosed.

JP 2011-76018 A

  By the way, if the sound output from the horn is made into a chord, it is considered that a comfortable sound is output for the occupant, and driving pleasure is increased. In this case, a resonance tube that resonates with each of the first sound and the second sound constituting the chord is required.

  However, in Patent Document 1, since only one resonance tube is provided, only one of the first and second sounds can resonate, and a chord having sufficient sound pressure cannot be output. There's a problem.

  An object of the present invention is to provide a horn resonance tube capable of outputting a chord having a sufficient sound pressure.

  The resonance tube of the horn according to the present invention is generated by the vibration of the diaphragm, and is generated by the vibration of the diaphragm, the first sound having the first frequency as a fundamental frequency, and has a relationship between the first frequency and the chord. The second sound having the second frequency as the fundamental frequency is resonated and mounted on the vehicle. The resonance tube of the horn receives a chord including the first sound and the second sound, and resonates the second sound by branching from the main resonance tube that resonates the first sound and the main resonance tube. A branch resonance tube. The main resonance tube is disposed on the first surface of the diaphragm. The branch resonance tube is branched from the main resonance tube on the first surface, and is arranged on a second surface opposite to the first surface of the diaphragm.

  According to this configuration, the resonance tube includes the main resonance tube that resonates the first sound and the branch resonance tube that branches from the main resonance tube and resonates the second sound. Can output chords with pressure. Further, the branch resonance tube is branched from the main resonance tube on the first surface, and is disposed on a second surface of the diaphragm opposite to the first surface. Therefore, since the main resonance tube and the branch resonance tube overlap in the thickness direction of the diaphragm, the size of the resonance tube in the radial direction of the diaphragm can be reduced.

  The said structure WHEREIN: The length in the center axis | shaft of the said main resonance tube and the length in the center axis | shaft of the said branch resonance tube may differ.

  According to this configuration, since the length in the central axis of the main resonance tube is different from the length in the central axis of the branch resonance tube, the resonance frequency of the first sound resonated by the main resonance tube and the branch resonance The resonance frequency of the second sound resonated by the tube is different. Therefore, the resonance tube can output a chord having a sufficient sound pressure.

  In the above-described configuration, the branch resonance tube includes a first branch tube portion disposed on the first surface, a second branch tube portion disposed on the second surface, the first branch tube portion, and the second branch tube. And an intermediate pipe part connecting the branch pipe part. The main resonance pipe may be disposed on the front side of the vehicle with respect to the second branch pipe section. The branch resonance tube may include an opening surface through which the second sound is output. The opening surface may coincide with the main resonance tube in the longitudinal direction of the vehicle.

  According to this configuration, since the opening surface coincides with the main resonance pipe in the front-rear direction of the vehicle, it is possible that rainwater or the like entering from the grill of the vehicle enters the branch resonance pipe from the opening surface. It becomes easy to be blocked by.

  A horn according to the present invention accommodates the movable tube having a fulcrum provided at a position eccentric with respect to the center of the diaphragm, and vibrating the resonance tube, the diaphragm, and the diaphragm. And a case disposed at the position eccentric from the center of the diaphragm of the second surface. The branch resonance tube is disposed on a side of the case on the second surface.

  According to this configuration, the branch resonance tube is disposed on the side of the case disposed at the position eccentric from the center of the diaphragm of the second surface, so that the branch resonance tube is disposed. It is not necessary to enlarge the diaphragm in order to secure the space.

  The resonance tube of the horn according to the present invention can output a chord having a sufficient sound pressure.

It is a perspective view of the horn provided with the resonance tube which concerns on embodiment of this invention. It is a front view of the horn provided with the resonance tube which concerns on embodiment of this invention. It is sectional drawing of the horn provided with the resonance tube which concerns on embodiment of this invention. It is a bottom view of the horn provided with the resonance tube which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is the right view which looked at the horn of FIG. 2 from the right side.

  FIG. 1 is a perspective view of a horn 1 with an exemplary resonance tube 2. FIG. 2 is a front view of the horn 1 with the exemplary resonance tube 2. FIG. 3 is a cross-sectional view of a horn 1 with an exemplary resonance tube 2. FIG. 4 is a bottom view of the horn 1 with the exemplary resonance tube 2. 1 to 3, the horn 1 is described using directions on the paper surface for convenience of explanation.

  The horn 1 includes a sound source device 10 that generates sound, and a resonance tube 2 that resonates sound output from the sound source device 10. As shown in FIG. 3, the sound source device 10 includes a diaphragm 11, a movable iron core 12 connected to the diaphragm 11 via a fulcrum region 1211, a fixed iron core 13 provided below the movable iron core 12, a coil , The bobbin 14 around which the winding 15 is wound, the movable iron core 12, the fixed iron core 13, the bobbin 14, and the winding 15, and the outer edge of the diaphragm 11 as the case 16. The outer frame 17 attached to the outer edge of the case 16 and the bracket 30 attached to the bottom surface 16a of the case 16 are provided.

  The diaphragm 11 is made of, for example, a flexible disk-shaped metal, vibrates due to the vibration of the movable iron core 12, and outputs sound. The diaphragm 11 is mounted on a mounting portion 161 a provided on the uppermost side of the case 16, and is fixed to the case 16 by being caulked by the outer frame 17. The diaphragm 11 is provided with a taper 111a having a slope in which a certain region surrounding a support portion 121, which will be described later, is inclined downward in a conical shape, and is easily vibrated.

  The movable iron core 12 is made of a magnetic material, and includes a support part 121 connected to the diaphragm 11 via a fulcrum region 1211 and a main body part 122 provided below the support part 121.

  The support portion 121 has a columnar shape, and sandwiches the fulcrum region 1211 from both sides in the vertical direction. The support portion 121 is provided at a position where the center of the fulcrum region 1211 (hereinafter referred to as “fulcrum 121a”) is eccentric to the right from the center O of the diaphragm 11. Here, the direction in which the fulcrum 121a is eccentric (here, the right side) is described as the eccentric direction D1.

  The main body portion 122 is generally composed of a columnar member that is longer than the support portion 121. The main body 122 is provided with a columnar cylindrical portion 1222 having a central axis C2 that is inclined obliquely leftward and downward with respect to the vertical direction as a longitudinal direction, and above the cylindrical portion 1222, and bent toward the support portion 121. And a bent portion 1221. The upper end of the bent portion 1221 is displaced in the eccentric direction D1 with respect to the central axis C1 of the support portion 121. Thereby, the center of gravity G of the movable iron core 12 is shifted in the eccentric direction D1. The central axis C1 is directed in the vertical direction, that is, the direction orthogonal to the diaphragm 11, and passes through the fulcrum 121a.

  In the example of FIG. 3, in order to shift the center of gravity G in the eccentric direction D1 from the fulcrum 121a, the bent portion 1221 protrudes in the eccentric direction D1. Therefore, the upper surface 1221u of the bent portion 1221 is exposed.

  The fixed iron core 13 is formed in a columnar shape. The fixed iron core 13 enters a hole 141 provided along the central axis of the bobbin 14 and the bobbin 14 is fitted therein. The fixed iron core 13 is fitted into a hole 16 b provided in the bottom surface 16 a of the case 16. Thereby, the fixed iron core 13 is fixed inside the case 16.

  The bobbin 14 is composed of a drum-shaped member around which the winding wire 15 is wound. In the bobbin 14, the movable iron core 12 is inserted into the hole 141 from above. The diameter of the hole 141 is slightly larger than the diameter of the cylindrical portion 1222 of the movable iron core 12. Thereby, in addition to the vibration along the central axis C2, the movable iron core 12 can swing around the fulcrum 121a.

  A signal generator (not shown) is connected to the winding 15, and a first signal component having a first frequency that resonates with the diaphragm 11 and a second signal component having a second frequency that resonates with the movable iron core 12. Including a driving signal.

  The case 16 is disposed on the back surface 11 b of the diaphragm 11. The case 16 includes an upper part 161 having a conical cylindrical shape and a substantially cylindrical lower part 162 provided below the upper part 161. The upper portion 161 includes a placement portion 161a on which the outer edge of the diaphragm 11 is placed, and a reduced diameter portion 161b whose diameter gradually decreases downward from the placement portion 161a. The reduced diameter portion 161b is formed such that the center in the inner diameter direction gradually shifts in the eccentric direction D1 from the center O of the diaphragm 11 downward. Thereby, the space for arrange | positioning the 4th bending part 22Ca of the branch resonance pipe 22 mentioned later on the left side of the diameter reducing part 161b is ensured. The lower portion 162 is connected to the lower end of the reduced diameter portion 161b, and has a cylindrical portion 162a that extends parallel to the central axis C1 of the fulcrum 121a, and a conical portion 162b that extends parallel to the central axis C2 of the main body portion 122. Have. The length of the cylindrical portion 162a in the direction of the central axis C1 is shorter than the length of the conical portion 162b in the direction of the central axis C2. The bottom surface 16a of the case 16 is perpendicular to the central axis C2 of the main body 122. The case 16 is disposed at a position displaced from the center O of the diaphragm 11 in the eccentric direction D1 as a whole with respect to the back surface 11b of the diaphragm 11.

  The bracket 30 is formed in a substantially L shape, and a contact surface 30a that contacts the bottom surface 16a of the case 16 and a hole 30c that extends rightward from the bottom surface 16a of the case 16 and attaches the horn 1 to the interior of the vehicle. And an attachment portion 30b provided with the.

  The resonance tube 2 includes a main resonance tube 21 disposed on the front surface 11 b of the diaphragm 11 and a branch resonance tube 22 branched from the main resonance tube 21 and disposed on the back surface 11 b of the vibration plate 11. The surface 11b of the diaphragm 11 is a surface opposite to the side on which the sound source device 10 is disposed, and is a surface facing the front of the vehicle when the horn 1 is mounted on the vehicle. The horn 1 is mounted on the vehicle such that a first opening surface 211 and a second opening surface 212 described later face downward of the vehicle (see FIG. 4). The surface 11 b of the diaphragm 11 is exemplified as the first surface of the diaphragm 11. The rear surface 11b of the diaphragm 11 is a surface on the side where the sound source device 10 is disposed. The back surface 11 b of the diaphragm 11 is exemplified as the second surface of the diaphragm 11.

  FIG. 5 is a cross-sectional view taken along line AA in FIG. Hereinafter, the main resonance tube 21 will be described mainly with reference to FIGS. The main resonance tube 21 is a resonance tube that resonates with the first sound included in the chord generated by the diaphragm 11. The main resonance tube 21 includes an input opening surface 212 for inputting chords and a first opening surface 211 for outputting a first sound. The input opening surface 212 is formed to face the center O of the diaphragm 11. The main resonance tube 21 is formed in a spiral shape so as to surround the input opening surface 212. The main resonance tube 21 includes a root portion 21A formed adjacent to the input opening surface 212, a first bent portion 21B extending from the root portion 21A in a substantially U shape, and a first bent portion 21B extending linearly from the first bent portion 21B. The first straight portion 21C and the second bent portion 21D extending from the first straight portion 21C to the first opening surface 211 are partitioned.

  The root portion 21 </ b> A has a first branch surface 213 a that opens toward the first bent portion 21 </ b> B and a second branch surface 213 b that opens toward the branch resonance tube 22.

  The first bent portion 21B is curved counterclockwise from the first branch surface 213a. The first straight portion 21 </ b> C extends to a position protruding from the outer edge of the diaphragm 11. The first bent portion 21B and the first straight portion 21C are formed so that their cross sections are equal over the entire length.

  The second bent portion 21 </ b> D is formed in a substantially C shape so as to extend along the outer edge of the diaphragm 11. The second bent portion 21 </ b> D is disposed so as to protrude from the outer edge of the diaphragm 11. The second bent portion 21 </ b> D is formed so that its cross section increases toward the first opening surface 211. The main resonance tube 21 communicates from the input opening surface 212 to the first opening surface 211.

  FIG. 6 is a right side view of the horn of FIG. 2 as viewed from the right side. The branch resonance tube 22 will be described mainly with reference to FIGS. The branch resonance tube 22 is a resonance tube that resonates with the second sound included in the chord. The branch resonance tube 22 includes a first branch tube portion 22A disposed on the front surface 11b of the diaphragm 11, a second branch tube portion 22C disposed on the back surface 11b of the diaphragm 11, the first branch tube portion 22A, and the first branch tube portion 22A. It is divided into an intermediate pipe portion 22B that connects the two branch pipe portions 22C.

  As shown in FIG. 5, the first branch pipe portion 22 </ b> A includes a second straight portion 22 </ b> Aa extending linearly from the second branch surface 213 b to the outer edge of the diaphragm 11, and an outer edge of the diaphragm 11 from the second straight portion 22 </ b> Aa. The arc-shaped third bent portion 22Ab extending in the counterclockwise direction and the third straight portion 22Ac extending linearly from the third bent portion 22Ab. The third bent portion 22Ab is arranged so as not to protrude from the outer edge of the diaphragm 11. The third linear portion 22Ac extends from the outer edge of the diaphragm 11 to a position that protrudes. 22 A of 1st branch pipe parts are formed so that a cross section may become equal from 2nd linear part 22Aa to 3rd linear part 22Ac.

  As illustrated in FIG. 6, the intermediate tube portion 22 </ b> B includes a fourth straight portion 22 </ b> Ba that extends linearly from the third straight portion 22Ac toward the back surface 11 b of the diaphragm 11. The fourth straight portion 22Ba extends to the position of the conical portion 162b of the case 16. The fourth linear portion 22Ba is formed so that the cross section becomes equal over the entire length.

  The second branch pipe portion 22C will be described with reference to FIG. The second branch pipe portion 22C has a fourth bent portion 22Ca that is bent at approximately 90 degrees from the fourth straight portion 22Ba and is disposed on the back surface 11b of the diaphragm 11. The fourth bent portion 22Ca is formed in a substantially C shape so as to extend along the outer edge of the diaphragm 11 from the fourth straight portion 22Ba in the direction opposite to the extending direction of the mounting portion 30b. The fourth bent portion 22Ca is formed so that the cross section increases toward the second opening surface 221. The fourth bent portion 22Ca has a second opening surface 221 that outputs the second sound. The fourth bent portion 22Ca is disposed so as to slightly protrude from the outer edge of the diaphragm 11. The amount of protrusion of the fourth bent portion 22Ca from the outer edge of the diaphragm 11 is smaller than the amount of protrusion of the second bent portion 21D from the outer edge of the diaphragm 11.

  The length of the fourth bent portion 22Ca in the central axis is shorter than the length of the second bent portion 21D in the central axis. Thus, the second opening surface 221 completely coincides with the second bent portion 21D and the diaphragm 11 in the front-rear direction of the vehicle. Therefore, rainwater or the like entering from the grill of the vehicle easily enters the branch resonance tube 22 from the second opening surface 221 by the second bent portion 21D. The branch resonance tube 22 communicates from the second branch surface 213b to the second opening surface 221.

  The length in the central axis from the first branch surface 213 a to the first opening surface 211 of the main resonance tube 21 is shorter than the length in the central axis from the second branch surface 213 b to the second opening surface 221 of the branch resonance tube 22. It has become. As a result, the resonance frequency of the first sound resonated by the main resonance tube 21 is different from the resonance frequency of the second sound resonated by the branch resonance tube 22, so that a chord having sufficient sound pressure is output. The

  The operation of the horn 1 configured as described above will be briefly described. When a drive signal from a signal generator (not shown) is applied to the winding 15, the movable iron core 12 is driven by receiving an electromagnetic force from the winding 15. Here, since the first signal component included in the drive signal has a first frequency that resonates with the diaphragm 11, the diaphragm 11 vibrates in the vertical direction by the movable iron core 12, and the first frequency is set as a fundamental frequency. A first sound is generated. Further, since the second signal component included in the drive signal has a second frequency that resonates with the movable core 12, the movable core 12 swings around the fulcrum 121a. Thereby, the diaphragm 11 generates a second sound having the second frequency as a fundamental frequency. In this way, a chord including the first sound and the second sound is generated by the vibration of the diaphragm 11.

  The first sound included in the chord generated by the vibration of the diaphragm 11 passes from the input opening surface 212 through the root portion 21A, the first bent portion 21B, the first straight portion 21C, and the second bent portion 21D in this order, and passes through the first opening. Output from the surface.

  The second sound included in the chord generated by the vibration of the diaphragm 11 passes through the branch portion from the input opening surface 212 of the main resonance tube 21, and passes from the second branch surface 213b to the second straight portion 22Aa of the first branch tube portion 22A. to go into. The second sound that has entered the second straight portion 22Aa passes through the third bent portion 22Ab and the third straight portion 22Ac in order, and reaches the fourth straight portion 22Ba of the intermediate tube portion 22B. The second sound reaching the fourth straight portion 22Ba passes through the fifth straight portion and the fourth bent portion 22Ca of the second branch pipe portion 22C and is output from the second opening surface 221.

  According to the horn 1, the first sound included in the chord generated by the vibration of the diaphragm 11 is resonated by the main resonance tube 21, and the second sound included in the chord generated by the vibration of the moving plate 11 is branched. Resonated by the resonance tube 22. Therefore, the horn 1 can output a chord having a sufficient sound pressure.

  According to the horn 1, the main resonance tube 21 is disposed on the front surface 11 b of the diaphragm 11, and the fourth bent portion 22 Ca of the branch resonance tube 22 is disposed on the back surface 11 b of the diaphragm 11. The main resonance tube 21 and the fourth bent portion 22Ca of the branch resonance tube 22 overlap in the vertical direction. Therefore, the size of the main resonance tube 21 and the branch resonance tube 22 in the radial direction of the diaphragm 11 is small.

  According to the horn 1 described above, the reduced diameter portion 161b is formed such that its axial center is gradually shifted downward from the center O of the diaphragm 11 in the eccentric direction D1, so the left side of the reduced diameter portion 161b. A space for arranging the fourth bent portion 22Ca of the branch resonance tube 22 is secured. Therefore, it is not necessary to enlarge the diaphragm 11 in order to secure a space for arranging the fourth bent portion 22Ca of the branch resonance tube 22.

  As the first frequency and the second frequency, incomplete consonance may be adopted, or complete consonance may be adopted. Here, as the first frequency and the second frequency, an incomplete consonance having a frequency ratio of 1.25 is employed, but the present invention is not limited to this.

DESCRIPTION OF SYMBOLS 1 Horn 2 Resonance tube 11 Diaphragm 11a 1st surface 11b 2nd surface 12 Movable iron core 16 Case 21 Main resonance tube 22 Branch resonance tube 22A 1st branch tube portion 22B Intermediate tube portion 22C 2nd branch tube portion 221 Opening surface O Center

Claims (4)

A second sound generated by vibration of the diaphragm and having a first frequency as a fundamental frequency and a second frequency generated by vibration of the diaphragm and having a relationship between the first frequency and a chord as a fundamental frequency Resonance with each sound, horn resonance tube mounted on the vehicle,
A main resonance tube that receives a chord including the first sound and the second sound and resonates the first sound;
A branch resonance tube branched from the main resonance tube and resonating the second sound,
The main resonance tube is disposed on the first surface of the diaphragm,
The branch resonance tube is branched from the main resonance tube on the first surface, and disposed on a second surface of the diaphragm opposite to the first surface. The horn resonance tube according to claim 1, wherein a length in a central axis of the main resonance tube is different from a length in a central axis of the branch resonance tube. The branch resonance tube includes a first branch tube portion disposed on the first surface, a second branch tube portion disposed on the second surface, the first branch tube portion, and the second branch tube portion. An intermediate pipe portion for connecting,
The main resonance pipe is disposed on the front side of the vehicle with respect to the second branch pipe section,
The branch resonance tube includes an opening surface through which the second sound is output in the second branch tube portion,
The horn resonance tube according to claim 1, wherein the opening surface coincides with the main resonance tube in a longitudinal direction of the vehicle. A horn resonance tube according to any one of claims 1 to 3,
The diaphragm;
A movable iron core that vibrates the diaphragm and is provided with a fulcrum at a position eccentric with respect to the center of the diaphragm;
A case that accommodates the movable iron core and is disposed at the position eccentric from the center of the diaphragm of the second surface;
The branch resonance tube is disposed on a side of the case on the second surface.

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